Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
607ca46e | 4 | #include <uapi/linux/sched.h> |
b7b3c76a | 5 | |
b7b3c76a DW |
6 | |
7 | struct sched_param { | |
8 | int sched_priority; | |
9 | }; | |
10 | ||
1da177e4 LT |
11 | #include <asm/param.h> /* for HZ */ |
12 | ||
1da177e4 LT |
13 | #include <linux/capability.h> |
14 | #include <linux/threads.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/timex.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/rbtree.h> | |
20 | #include <linux/thread_info.h> | |
21 | #include <linux/cpumask.h> | |
22 | #include <linux/errno.h> | |
23 | #include <linux/nodemask.h> | |
c92ff1bd | 24 | #include <linux/mm_types.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/page.h> |
27 | #include <asm/ptrace.h> | |
1da177e4 LT |
28 | #include <asm/cputime.h> |
29 | ||
30 | #include <linux/smp.h> | |
31 | #include <linux/sem.h> | |
32 | #include <linux/signal.h> | |
1da177e4 LT |
33 | #include <linux/compiler.h> |
34 | #include <linux/completion.h> | |
35 | #include <linux/pid.h> | |
36 | #include <linux/percpu.h> | |
37 | #include <linux/topology.h> | |
3e26c149 | 38 | #include <linux/proportions.h> |
1da177e4 | 39 | #include <linux/seccomp.h> |
e56d0903 | 40 | #include <linux/rcupdate.h> |
05725f7e | 41 | #include <linux/rculist.h> |
23f78d4a | 42 | #include <linux/rtmutex.h> |
1da177e4 | 43 | |
a3b6714e DW |
44 | #include <linux/time.h> |
45 | #include <linux/param.h> | |
46 | #include <linux/resource.h> | |
47 | #include <linux/timer.h> | |
48 | #include <linux/hrtimer.h> | |
7c3ab738 | 49 | #include <linux/task_io_accounting.h> |
9745512c | 50 | #include <linux/latencytop.h> |
9e2b2dc4 | 51 | #include <linux/cred.h> |
fa14ff4a | 52 | #include <linux/llist.h> |
7b44ab97 | 53 | #include <linux/uidgid.h> |
a3b6714e DW |
54 | |
55 | #include <asm/processor.h> | |
36d57ac4 | 56 | |
1da177e4 | 57 | struct exec_domain; |
c87e2837 | 58 | struct futex_pi_state; |
286100a6 | 59 | struct robust_list_head; |
bddd87c7 | 60 | struct bio_list; |
5ad4e53b | 61 | struct fs_struct; |
cdd6c482 | 62 | struct perf_event_context; |
73c10101 | 63 | struct blk_plug; |
1da177e4 | 64 | |
1da177e4 LT |
65 | /* |
66 | * List of flags we want to share for kernel threads, | |
67 | * if only because they are not used by them anyway. | |
68 | */ | |
69 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
70 | ||
71 | /* | |
72 | * These are the constant used to fake the fixed-point load-average | |
73 | * counting. Some notes: | |
74 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
75 | * a load-average precision of 10 bits integer + 11 bits fractional | |
76 | * - if you want to count load-averages more often, you need more | |
77 | * precision, or rounding will get you. With 2-second counting freq, | |
78 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
79 | * 11 bit fractions. | |
80 | */ | |
81 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 82 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
83 | |
84 | #define FSHIFT 11 /* nr of bits of precision */ | |
85 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 86 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
87 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
88 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
89 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
90 | ||
91 | #define CALC_LOAD(load,exp,n) \ | |
92 | load *= exp; \ | |
93 | load += n*(FIXED_1-exp); \ | |
94 | load >>= FSHIFT; | |
95 | ||
96 | extern unsigned long total_forks; | |
97 | extern int nr_threads; | |
1da177e4 LT |
98 | DECLARE_PER_CPU(unsigned long, process_counts); |
99 | extern int nr_processes(void); | |
100 | extern unsigned long nr_running(void); | |
101 | extern unsigned long nr_uninterruptible(void); | |
102 | extern unsigned long nr_iowait(void); | |
8c215bd3 | 103 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
104 | extern unsigned long this_cpu_load(void); |
105 | ||
106 | ||
0f004f5a | 107 | extern void calc_global_load(unsigned long ticks); |
5aaa0b7a | 108 | extern void update_cpu_load_nohz(void); |
1da177e4 | 109 | |
7e49fcce SR |
110 | extern unsigned long get_parent_ip(unsigned long addr); |
111 | ||
43ae34cb IM |
112 | struct seq_file; |
113 | struct cfs_rq; | |
4cf86d77 | 114 | struct task_group; |
43ae34cb IM |
115 | #ifdef CONFIG_SCHED_DEBUG |
116 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
117 | extern void proc_sched_set_task(struct task_struct *p); | |
118 | extern void | |
5cef9eca | 119 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
120 | #else |
121 | static inline void | |
122 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
123 | { | |
124 | } | |
125 | static inline void proc_sched_set_task(struct task_struct *p) | |
126 | { | |
127 | } | |
128 | static inline void | |
5cef9eca | 129 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
130 | { |
131 | } | |
132 | #endif | |
1da177e4 | 133 | |
4a8342d2 LT |
134 | /* |
135 | * Task state bitmask. NOTE! These bits are also | |
136 | * encoded in fs/proc/array.c: get_task_state(). | |
137 | * | |
138 | * We have two separate sets of flags: task->state | |
139 | * is about runnability, while task->exit_state are | |
140 | * about the task exiting. Confusing, but this way | |
141 | * modifying one set can't modify the other one by | |
142 | * mistake. | |
143 | */ | |
1da177e4 LT |
144 | #define TASK_RUNNING 0 |
145 | #define TASK_INTERRUPTIBLE 1 | |
146 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
147 | #define __TASK_STOPPED 4 |
148 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
149 | /* in tsk->exit_state */ |
150 | #define EXIT_ZOMBIE 16 | |
151 | #define EXIT_DEAD 32 | |
152 | /* in tsk->state again */ | |
af927232 | 153 | #define TASK_DEAD 64 |
f021a3c2 | 154 | #define TASK_WAKEKILL 128 |
e9c84311 | 155 | #define TASK_WAKING 256 |
e1781538 | 156 | #define TASK_STATE_MAX 512 |
f021a3c2 | 157 | |
44d90df6 | 158 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
73342151 | 159 | |
e1781538 PZ |
160 | extern char ___assert_task_state[1 - 2*!!( |
161 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
162 | |
163 | /* Convenience macros for the sake of set_task_state */ | |
164 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
165 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
166 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 167 | |
92a1f4bc MW |
168 | /* Convenience macros for the sake of wake_up */ |
169 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 170 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
171 | |
172 | /* get_task_state() */ | |
173 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
174 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
175 | __TASK_TRACED) | |
92a1f4bc | 176 | |
f021a3c2 MW |
177 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
178 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 179 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 180 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 181 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 182 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 183 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
376fede8 | 184 | (task->flags & PF_FROZEN) == 0) |
1da177e4 LT |
185 | |
186 | #define __set_task_state(tsk, state_value) \ | |
187 | do { (tsk)->state = (state_value); } while (0) | |
188 | #define set_task_state(tsk, state_value) \ | |
189 | set_mb((tsk)->state, (state_value)) | |
190 | ||
498d0c57 AM |
191 | /* |
192 | * set_current_state() includes a barrier so that the write of current->state | |
193 | * is correctly serialised wrt the caller's subsequent test of whether to | |
194 | * actually sleep: | |
195 | * | |
196 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
197 | * if (do_i_need_to_sleep()) | |
198 | * schedule(); | |
199 | * | |
200 | * If the caller does not need such serialisation then use __set_current_state() | |
201 | */ | |
1da177e4 LT |
202 | #define __set_current_state(state_value) \ |
203 | do { current->state = (state_value); } while (0) | |
204 | #define set_current_state(state_value) \ | |
205 | set_mb(current->state, (state_value)) | |
206 | ||
207 | /* Task command name length */ | |
208 | #define TASK_COMM_LEN 16 | |
209 | ||
1da177e4 LT |
210 | #include <linux/spinlock.h> |
211 | ||
212 | /* | |
213 | * This serializes "schedule()" and also protects | |
214 | * the run-queue from deletions/modifications (but | |
215 | * _adding_ to the beginning of the run-queue has | |
216 | * a separate lock). | |
217 | */ | |
218 | extern rwlock_t tasklist_lock; | |
219 | extern spinlock_t mmlist_lock; | |
220 | ||
36c8b586 | 221 | struct task_struct; |
1da177e4 | 222 | |
db1466b3 PM |
223 | #ifdef CONFIG_PROVE_RCU |
224 | extern int lockdep_tasklist_lock_is_held(void); | |
225 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
226 | ||
1da177e4 LT |
227 | extern void sched_init(void); |
228 | extern void sched_init_smp(void); | |
2d07b255 | 229 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 230 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 231 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 232 | |
89f19f04 | 233 | extern int runqueue_is_locked(int cpu); |
017730c1 | 234 | |
46cb4b7c | 235 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
c1cc017c | 236 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 237 | extern void set_cpu_sd_state_idle(void); |
83cd4fe2 | 238 | extern int get_nohz_timer_target(void); |
46cb4b7c | 239 | #else |
c1cc017c | 240 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 241 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 242 | #endif |
1da177e4 | 243 | |
e59e2ae2 | 244 | /* |
39bc89fd | 245 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
246 | */ |
247 | extern void show_state_filter(unsigned long state_filter); | |
248 | ||
249 | static inline void show_state(void) | |
250 | { | |
39bc89fd | 251 | show_state_filter(0); |
e59e2ae2 IM |
252 | } |
253 | ||
1da177e4 LT |
254 | extern void show_regs(struct pt_regs *); |
255 | ||
256 | /* | |
257 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
258 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
259 | * trace (or NULL if the entire call-chain of the task should be shown). | |
260 | */ | |
261 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
262 | ||
263 | void io_schedule(void); | |
264 | long io_schedule_timeout(long timeout); | |
265 | ||
266 | extern void cpu_init (void); | |
267 | extern void trap_init(void); | |
268 | extern void update_process_times(int user); | |
269 | extern void scheduler_tick(void); | |
270 | ||
82a1fcb9 IM |
271 | extern void sched_show_task(struct task_struct *p); |
272 | ||
19cc36c0 | 273 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 274 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 275 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 276 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
277 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
278 | void __user *buffer, | |
279 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 280 | extern unsigned int softlockup_panic; |
004417a6 | 281 | void lockup_detector_init(void); |
8446f1d3 | 282 | #else |
8446f1d3 IM |
283 | static inline void touch_softlockup_watchdog(void) |
284 | { | |
285 | } | |
d6ad3e28 JW |
286 | static inline void touch_softlockup_watchdog_sync(void) |
287 | { | |
288 | } | |
04c9167f JF |
289 | static inline void touch_all_softlockup_watchdogs(void) |
290 | { | |
291 | } | |
004417a6 PZ |
292 | static inline void lockup_detector_init(void) |
293 | { | |
294 | } | |
8446f1d3 IM |
295 | #endif |
296 | ||
e162b39a MSB |
297 | #ifdef CONFIG_DETECT_HUNG_TASK |
298 | extern unsigned int sysctl_hung_task_panic; | |
299 | extern unsigned long sysctl_hung_task_check_count; | |
300 | extern unsigned long sysctl_hung_task_timeout_secs; | |
301 | extern unsigned long sysctl_hung_task_warnings; | |
302 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
8d65af78 | 303 | void __user *buffer, |
e162b39a | 304 | size_t *lenp, loff_t *ppos); |
e4ecda1b ML |
305 | #else |
306 | /* Avoid need for ifdefs elsewhere in the code */ | |
307 | enum { sysctl_hung_task_timeout_secs = 0 }; | |
e162b39a | 308 | #endif |
8446f1d3 | 309 | |
1da177e4 LT |
310 | /* Attach to any functions which should be ignored in wchan output. */ |
311 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
312 | |
313 | /* Linker adds these: start and end of __sched functions */ | |
314 | extern char __sched_text_start[], __sched_text_end[]; | |
315 | ||
1da177e4 LT |
316 | /* Is this address in the __sched functions? */ |
317 | extern int in_sched_functions(unsigned long addr); | |
318 | ||
319 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 320 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 321 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 322 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 323 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 324 | asmlinkage void schedule(void); |
c5491ea7 | 325 | extern void schedule_preempt_disabled(void); |
c6eb3dda | 326 | extern int mutex_spin_on_owner(struct mutex *lock, struct task_struct *owner); |
1da177e4 | 327 | |
ab516013 | 328 | struct nsproxy; |
acce292c | 329 | struct user_namespace; |
1da177e4 | 330 | |
341c87bf KH |
331 | /* |
332 | * Default maximum number of active map areas, this limits the number of vmas | |
333 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
334 | * problem. | |
335 | * | |
336 | * When a program's coredump is generated as ELF format, a section is created | |
337 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
338 | * This means the number of sections should be smaller than 65535 at coredump. | |
339 | * Because the kernel adds some informative sections to a image of program at | |
340 | * generating coredump, we need some margin. The number of extra sections is | |
341 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
342 | */ | |
343 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
4be929be | 344 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
1da177e4 LT |
345 | |
346 | extern int sysctl_max_map_count; | |
347 | ||
348 | #include <linux/aio.h> | |
349 | ||
efc1a3b1 DH |
350 | #ifdef CONFIG_MMU |
351 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
352 | extern unsigned long |
353 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
354 | unsigned long, unsigned long); | |
355 | extern unsigned long | |
356 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
357 | unsigned long len, unsigned long pgoff, | |
358 | unsigned long flags); | |
1363c3cd WW |
359 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
360 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
efc1a3b1 DH |
361 | #else |
362 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
363 | #endif | |
1da177e4 | 364 | |
901608d9 | 365 | |
6c5d5238 KH |
366 | extern void set_dumpable(struct mm_struct *mm, int value); |
367 | extern int get_dumpable(struct mm_struct *mm); | |
368 | ||
54b50199 KC |
369 | /* get/set_dumpable() values */ |
370 | #define SUID_DUMPABLE_DISABLED 0 | |
371 | #define SUID_DUMPABLE_ENABLED 1 | |
372 | #define SUID_DUMPABLE_SAFE 2 | |
373 | ||
6c5d5238 | 374 | /* mm flags */ |
3cb4a0bb | 375 | /* dumpable bits */ |
6c5d5238 KH |
376 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
377 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 378 | |
3cb4a0bb | 379 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 380 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
381 | |
382 | /* coredump filter bits */ | |
383 | #define MMF_DUMP_ANON_PRIVATE 2 | |
384 | #define MMF_DUMP_ANON_SHARED 3 | |
385 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
386 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 387 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
388 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
389 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 390 | |
3cb4a0bb | 391 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 392 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
393 | #define MMF_DUMP_FILTER_MASK \ |
394 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
395 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 396 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
397 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
398 | ||
399 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
400 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
401 | #else | |
402 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
403 | #endif | |
f8af4da3 HD |
404 | /* leave room for more dump flags */ |
405 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 406 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
bafb282d | 407 | #define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ |
f8af4da3 | 408 | |
9f68f672 ON |
409 | #define MMF_HAS_UPROBES 19 /* has uprobes */ |
410 | #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ | |
f8ac4ec9 | 411 | |
f8af4da3 | 412 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) |
6c5d5238 | 413 | |
1da177e4 LT |
414 | struct sighand_struct { |
415 | atomic_t count; | |
416 | struct k_sigaction action[_NSIG]; | |
417 | spinlock_t siglock; | |
b8fceee1 | 418 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
419 | }; |
420 | ||
0e464814 | 421 | struct pacct_struct { |
f6ec29a4 KK |
422 | int ac_flag; |
423 | long ac_exitcode; | |
0e464814 | 424 | unsigned long ac_mem; |
77787bfb KK |
425 | cputime_t ac_utime, ac_stime; |
426 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
427 | }; |
428 | ||
42c4ab41 SG |
429 | struct cpu_itimer { |
430 | cputime_t expires; | |
431 | cputime_t incr; | |
8356b5f9 SG |
432 | u32 error; |
433 | u32 incr_error; | |
42c4ab41 SG |
434 | }; |
435 | ||
f06febc9 FM |
436 | /** |
437 | * struct task_cputime - collected CPU time counts | |
438 | * @utime: time spent in user mode, in &cputime_t units | |
439 | * @stime: time spent in kernel mode, in &cputime_t units | |
440 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 441 | * |
f06febc9 FM |
442 | * This structure groups together three kinds of CPU time that are |
443 | * tracked for threads and thread groups. Most things considering | |
444 | * CPU time want to group these counts together and treat all three | |
445 | * of them in parallel. | |
446 | */ | |
447 | struct task_cputime { | |
448 | cputime_t utime; | |
449 | cputime_t stime; | |
450 | unsigned long long sum_exec_runtime; | |
451 | }; | |
452 | /* Alternate field names when used to cache expirations. */ | |
453 | #define prof_exp stime | |
454 | #define virt_exp utime | |
455 | #define sched_exp sum_exec_runtime | |
456 | ||
4cd4c1b4 PZ |
457 | #define INIT_CPUTIME \ |
458 | (struct task_cputime) { \ | |
64861634 MS |
459 | .utime = 0, \ |
460 | .stime = 0, \ | |
4cd4c1b4 PZ |
461 | .sum_exec_runtime = 0, \ |
462 | } | |
463 | ||
c99e6efe PZ |
464 | /* |
465 | * Disable preemption until the scheduler is running. | |
466 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
467 | * |
468 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
469 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 470 | */ |
d86ee480 | 471 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 472 | |
f06febc9 | 473 | /** |
4cd4c1b4 PZ |
474 | * struct thread_group_cputimer - thread group interval timer counts |
475 | * @cputime: thread group interval timers. | |
476 | * @running: non-zero when there are timers running and | |
477 | * @cputime receives updates. | |
478 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
479 | * |
480 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 481 | * used for thread group CPU timer calculations. |
f06febc9 | 482 | */ |
4cd4c1b4 PZ |
483 | struct thread_group_cputimer { |
484 | struct task_cputime cputime; | |
485 | int running; | |
ee30a7b2 | 486 | raw_spinlock_t lock; |
f06febc9 | 487 | }; |
f06febc9 | 488 | |
4714d1d3 | 489 | #include <linux/rwsem.h> |
5091faa4 MG |
490 | struct autogroup; |
491 | ||
1da177e4 | 492 | /* |
e815f0a8 | 493 | * NOTE! "signal_struct" does not have its own |
1da177e4 LT |
494 | * locking, because a shared signal_struct always |
495 | * implies a shared sighand_struct, so locking | |
496 | * sighand_struct is always a proper superset of | |
497 | * the locking of signal_struct. | |
498 | */ | |
499 | struct signal_struct { | |
ea6d290c | 500 | atomic_t sigcnt; |
1da177e4 | 501 | atomic_t live; |
b3ac022c | 502 | int nr_threads; |
1da177e4 LT |
503 | |
504 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
505 | ||
506 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 507 | struct task_struct *curr_target; |
1da177e4 LT |
508 | |
509 | /* shared signal handling: */ | |
510 | struct sigpending shared_pending; | |
511 | ||
512 | /* thread group exit support */ | |
513 | int group_exit_code; | |
514 | /* overloaded: | |
515 | * - notify group_exit_task when ->count is equal to notify_count | |
516 | * - everyone except group_exit_task is stopped during signal delivery | |
517 | * of fatal signals, group_exit_task processes the signal. | |
518 | */ | |
1da177e4 | 519 | int notify_count; |
07dd20e0 | 520 | struct task_struct *group_exit_task; |
1da177e4 LT |
521 | |
522 | /* thread group stop support, overloads group_exit_code too */ | |
523 | int group_stop_count; | |
524 | unsigned int flags; /* see SIGNAL_* flags below */ | |
525 | ||
ebec18a6 LP |
526 | /* |
527 | * PR_SET_CHILD_SUBREAPER marks a process, like a service | |
528 | * manager, to re-parent orphan (double-forking) child processes | |
529 | * to this process instead of 'init'. The service manager is | |
530 | * able to receive SIGCHLD signals and is able to investigate | |
531 | * the process until it calls wait(). All children of this | |
532 | * process will inherit a flag if they should look for a | |
533 | * child_subreaper process at exit. | |
534 | */ | |
535 | unsigned int is_child_subreaper:1; | |
536 | unsigned int has_child_subreaper:1; | |
537 | ||
1da177e4 LT |
538 | /* POSIX.1b Interval Timers */ |
539 | struct list_head posix_timers; | |
540 | ||
541 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 542 | struct hrtimer real_timer; |
fea9d175 | 543 | struct pid *leader_pid; |
2ff678b8 | 544 | ktime_t it_real_incr; |
1da177e4 | 545 | |
42c4ab41 SG |
546 | /* |
547 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
548 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
549 | * values are defined to 0 and 1 respectively | |
550 | */ | |
551 | struct cpu_itimer it[2]; | |
1da177e4 | 552 | |
f06febc9 | 553 | /* |
4cd4c1b4 PZ |
554 | * Thread group totals for process CPU timers. |
555 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 556 | */ |
4cd4c1b4 | 557 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
558 | |
559 | /* Earliest-expiration cache. */ | |
560 | struct task_cputime cputime_expires; | |
561 | ||
562 | struct list_head cpu_timers[3]; | |
563 | ||
ab521dc0 | 564 | struct pid *tty_old_pgrp; |
1ec320af | 565 | |
1da177e4 LT |
566 | /* boolean value for session group leader */ |
567 | int leader; | |
568 | ||
569 | struct tty_struct *tty; /* NULL if no tty */ | |
570 | ||
5091faa4 MG |
571 | #ifdef CONFIG_SCHED_AUTOGROUP |
572 | struct autogroup *autogroup; | |
573 | #endif | |
1da177e4 LT |
574 | /* |
575 | * Cumulative resource counters for dead threads in the group, | |
576 | * and for reaped dead child processes forked by this group. | |
577 | * Live threads maintain their own counters and add to these | |
578 | * in __exit_signal, except for the group leader. | |
579 | */ | |
32bd671d | 580 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
581 | cputime_t gtime; |
582 | cputime_t cgtime; | |
0cf55e1e HS |
583 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
584 | cputime_t prev_utime, prev_stime; | |
585 | #endif | |
1da177e4 LT |
586 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
587 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 588 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 589 | unsigned long maxrss, cmaxrss; |
940389b8 | 590 | struct task_io_accounting ioac; |
1da177e4 | 591 | |
32bd671d PZ |
592 | /* |
593 | * Cumulative ns of schedule CPU time fo dead threads in the | |
594 | * group, not including a zombie group leader, (This only differs | |
595 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
596 | * other than jiffies.) | |
597 | */ | |
598 | unsigned long long sum_sched_runtime; | |
599 | ||
1da177e4 LT |
600 | /* |
601 | * We don't bother to synchronize most readers of this at all, | |
602 | * because there is no reader checking a limit that actually needs | |
603 | * to get both rlim_cur and rlim_max atomically, and either one | |
604 | * alone is a single word that can safely be read normally. | |
605 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
606 | * protect this instead of the siglock, because they really | |
607 | * have no need to disable irqs. | |
608 | */ | |
609 | struct rlimit rlim[RLIM_NLIMITS]; | |
610 | ||
0e464814 KK |
611 | #ifdef CONFIG_BSD_PROCESS_ACCT |
612 | struct pacct_struct pacct; /* per-process accounting information */ | |
613 | #endif | |
ad4ecbcb | 614 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
615 | struct taskstats *stats; |
616 | #endif | |
522ed776 MT |
617 | #ifdef CONFIG_AUDIT |
618 | unsigned audit_tty; | |
619 | struct tty_audit_buf *tty_audit_buf; | |
620 | #endif | |
4714d1d3 BB |
621 | #ifdef CONFIG_CGROUPS |
622 | /* | |
77e4ef99 TH |
623 | * group_rwsem prevents new tasks from entering the threadgroup and |
624 | * member tasks from exiting,a more specifically, setting of | |
625 | * PF_EXITING. fork and exit paths are protected with this rwsem | |
626 | * using threadgroup_change_begin/end(). Users which require | |
627 | * threadgroup to remain stable should use threadgroup_[un]lock() | |
628 | * which also takes care of exec path. Currently, cgroup is the | |
629 | * only user. | |
4714d1d3 | 630 | */ |
257058ae | 631 | struct rw_semaphore group_rwsem; |
4714d1d3 | 632 | #endif |
28b83c51 | 633 | |
a63d83f4 | 634 | int oom_score_adj; /* OOM kill score adjustment */ |
dabb16f6 MSB |
635 | int oom_score_adj_min; /* OOM kill score adjustment minimum value. |
636 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
637 | |
638 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
639 | * credential calculations | |
640 | * (notably. ptrace) */ | |
1da177e4 LT |
641 | }; |
642 | ||
643 | /* | |
644 | * Bits in flags field of signal_struct. | |
645 | */ | |
646 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
ee77f075 ON |
647 | #define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */ |
648 | #define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */ | |
e4420551 ON |
649 | /* |
650 | * Pending notifications to parent. | |
651 | */ | |
652 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
653 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
654 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 655 | |
fae5fa44 ON |
656 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
657 | ||
ed5d2cac ON |
658 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
659 | static inline int signal_group_exit(const struct signal_struct *sig) | |
660 | { | |
661 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
662 | (sig->group_exit_task != NULL); | |
663 | } | |
664 | ||
1da177e4 LT |
665 | /* |
666 | * Some day this will be a full-fledged user tracking system.. | |
667 | */ | |
668 | struct user_struct { | |
669 | atomic_t __count; /* reference count */ | |
670 | atomic_t processes; /* How many processes does this user have? */ | |
671 | atomic_t files; /* How many open files does this user have? */ | |
672 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 673 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
674 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
675 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
676 | #endif | |
4afeff85 EP |
677 | #ifdef CONFIG_FANOTIFY |
678 | atomic_t fanotify_listeners; | |
679 | #endif | |
7ef9964e | 680 | #ifdef CONFIG_EPOLL |
52bd19f7 | 681 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 682 | #endif |
970a8645 | 683 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
684 | /* protected by mq_lock */ |
685 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 686 | #endif |
1da177e4 LT |
687 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
688 | ||
689 | #ifdef CONFIG_KEYS | |
690 | struct key *uid_keyring; /* UID specific keyring */ | |
691 | struct key *session_keyring; /* UID's default session keyring */ | |
692 | #endif | |
693 | ||
694 | /* Hash table maintenance information */ | |
735de223 | 695 | struct hlist_node uidhash_node; |
7b44ab97 | 696 | kuid_t uid; |
24e377a8 | 697 | |
cdd6c482 | 698 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
699 | atomic_long_t locked_vm; |
700 | #endif | |
1da177e4 LT |
701 | }; |
702 | ||
eb41d946 | 703 | extern int uids_sysfs_init(void); |
5cb350ba | 704 | |
7b44ab97 | 705 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
706 | |
707 | extern struct user_struct root_user; | |
708 | #define INIT_USER (&root_user) | |
709 | ||
b6dff3ec | 710 | |
1da177e4 LT |
711 | struct backing_dev_info; |
712 | struct reclaim_state; | |
713 | ||
52f17b6c | 714 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
715 | struct sched_info { |
716 | /* cumulative counters */ | |
2d72376b | 717 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 718 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
719 | |
720 | /* timestamps */ | |
172ba844 BS |
721 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
722 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 723 | }; |
52f17b6c | 724 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 725 | |
ca74e92b SN |
726 | #ifdef CONFIG_TASK_DELAY_ACCT |
727 | struct task_delay_info { | |
728 | spinlock_t lock; | |
729 | unsigned int flags; /* Private per-task flags */ | |
730 | ||
731 | /* For each stat XXX, add following, aligned appropriately | |
732 | * | |
733 | * struct timespec XXX_start, XXX_end; | |
734 | * u64 XXX_delay; | |
735 | * u32 XXX_count; | |
736 | * | |
737 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
738 | * single lock above (split into XXX_lock if contention is an issue). | |
739 | */ | |
0ff92245 SN |
740 | |
741 | /* | |
742 | * XXX_count is incremented on every XXX operation, the delay | |
743 | * associated with the operation is added to XXX_delay. | |
744 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
745 | */ | |
746 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
747 | u64 blkio_delay; /* wait for sync block io completion */ | |
748 | u64 swapin_delay; /* wait for swapin block io completion */ | |
749 | u32 blkio_count; /* total count of the number of sync block */ | |
750 | /* io operations performed */ | |
751 | u32 swapin_count; /* total count of the number of swapin block */ | |
752 | /* io operations performed */ | |
873b4771 KK |
753 | |
754 | struct timespec freepages_start, freepages_end; | |
755 | u64 freepages_delay; /* wait for memory reclaim */ | |
756 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 757 | }; |
52f17b6c CS |
758 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
759 | ||
760 | static inline int sched_info_on(void) | |
761 | { | |
762 | #ifdef CONFIG_SCHEDSTATS | |
763 | return 1; | |
764 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
765 | extern int delayacct_on; | |
766 | return delayacct_on; | |
767 | #else | |
768 | return 0; | |
ca74e92b | 769 | #endif |
52f17b6c | 770 | } |
ca74e92b | 771 | |
d15bcfdb IM |
772 | enum cpu_idle_type { |
773 | CPU_IDLE, | |
774 | CPU_NOT_IDLE, | |
775 | CPU_NEWLY_IDLE, | |
776 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
777 | }; |
778 | ||
779 | /* | |
c8b28116 NR |
780 | * Increase resolution of nice-level calculations for 64-bit architectures. |
781 | * The extra resolution improves shares distribution and load balancing of | |
782 | * low-weight task groups (eg. nice +19 on an autogroup), deeper taskgroup | |
783 | * hierarchies, especially on larger systems. This is not a user-visible change | |
784 | * and does not change the user-interface for setting shares/weights. | |
785 | * | |
786 | * We increase resolution only if we have enough bits to allow this increased | |
787 | * resolution (i.e. BITS_PER_LONG > 32). The costs for increasing resolution | |
788 | * when BITS_PER_LONG <= 32 are pretty high and the returns do not justify the | |
789 | * increased costs. | |
1da177e4 | 790 | */ |
e4c2fb0d | 791 | #if 0 /* BITS_PER_LONG > 32 -- currently broken: it increases power usage under light load */ |
c8b28116 NR |
792 | # define SCHED_LOAD_RESOLUTION 10 |
793 | # define scale_load(w) ((w) << SCHED_LOAD_RESOLUTION) | |
794 | # define scale_load_down(w) ((w) >> SCHED_LOAD_RESOLUTION) | |
795 | #else | |
796 | # define SCHED_LOAD_RESOLUTION 0 | |
797 | # define scale_load(w) (w) | |
798 | # define scale_load_down(w) (w) | |
799 | #endif | |
9aa7b369 | 800 | |
c8b28116 | 801 | #define SCHED_LOAD_SHIFT (10 + SCHED_LOAD_RESOLUTION) |
9aa7b369 IM |
802 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) |
803 | ||
1399fa78 NR |
804 | /* |
805 | * Increase resolution of cpu_power calculations | |
806 | */ | |
807 | #define SCHED_POWER_SHIFT 10 | |
808 | #define SCHED_POWER_SCALE (1L << SCHED_POWER_SHIFT) | |
1da177e4 | 809 | |
1399fa78 NR |
810 | /* |
811 | * sched-domains (multiprocessor balancing) declarations: | |
812 | */ | |
2dd73a4f | 813 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
814 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
815 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
816 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
817 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 818 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 819 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
b5d978e0 | 820 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
b5d978e0 PZ |
821 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ |
822 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 823 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 824 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
e3589f6c | 825 | #define SD_OVERLAP 0x2000 /* sched_domains of this level overlap */ |
5c45bf27 | 826 | |
532cb4c4 MN |
827 | extern int __weak arch_sd_sibiling_asym_packing(void); |
828 | ||
9c3f75cb | 829 | struct sched_group_power { |
e3589f6c | 830 | atomic_t ref; |
1da177e4 LT |
831 | /* |
832 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 833 | * single CPU. |
5517d86b | 834 | */ |
9c3f75cb | 835 | unsigned int power, power_orig; |
4ec4412e | 836 | unsigned long next_update; |
69e1e811 SS |
837 | /* |
838 | * Number of busy cpus in this group. | |
839 | */ | |
840 | atomic_t nr_busy_cpus; | |
c1174876 PZ |
841 | |
842 | unsigned long cpumask[0]; /* iteration mask */ | |
9c3f75cb PZ |
843 | }; |
844 | ||
845 | struct sched_group { | |
846 | struct sched_group *next; /* Must be a circular list */ | |
847 | atomic_t ref; | |
848 | ||
aae6d3dd | 849 | unsigned int group_weight; |
9c3f75cb | 850 | struct sched_group_power *sgp; |
6c99e9ad | 851 | |
4200efd9 IM |
852 | /* |
853 | * The CPUs this group covers. | |
854 | * | |
855 | * NOTE: this field is variable length. (Allocated dynamically | |
856 | * by attaching extra space to the end of the structure, | |
857 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
858 | */ |
859 | unsigned long cpumask[0]; | |
1da177e4 LT |
860 | }; |
861 | ||
758b2cdc RR |
862 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
863 | { | |
6c99e9ad | 864 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
865 | } |
866 | ||
c1174876 PZ |
867 | /* |
868 | * cpumask masking which cpus in the group are allowed to iterate up the domain | |
869 | * tree. | |
870 | */ | |
871 | static inline struct cpumask *sched_group_mask(struct sched_group *sg) | |
872 | { | |
873 | return to_cpumask(sg->sgp->cpumask); | |
874 | } | |
875 | ||
029632fb PZ |
876 | /** |
877 | * group_first_cpu - Returns the first cpu in the cpumask of a sched_group. | |
878 | * @group: The group whose first cpu is to be returned. | |
879 | */ | |
880 | static inline unsigned int group_first_cpu(struct sched_group *group) | |
881 | { | |
882 | return cpumask_first(sched_group_cpus(group)); | |
883 | } | |
884 | ||
1d3504fc HS |
885 | struct sched_domain_attr { |
886 | int relax_domain_level; | |
887 | }; | |
888 | ||
889 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
890 | .relax_domain_level = -1, \ | |
891 | } | |
892 | ||
60495e77 PZ |
893 | extern int sched_domain_level_max; |
894 | ||
1da177e4 LT |
895 | struct sched_domain { |
896 | /* These fields must be setup */ | |
897 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 898 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 899 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
900 | unsigned long min_interval; /* Minimum balance interval ms */ |
901 | unsigned long max_interval; /* Maximum balance interval ms */ | |
902 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
903 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 904 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
905 | unsigned int busy_idx; |
906 | unsigned int idle_idx; | |
907 | unsigned int newidle_idx; | |
908 | unsigned int wake_idx; | |
147cbb4b | 909 | unsigned int forkexec_idx; |
a52bfd73 | 910 | unsigned int smt_gain; |
1da177e4 | 911 | int flags; /* See SD_* */ |
60495e77 | 912 | int level; |
1da177e4 LT |
913 | |
914 | /* Runtime fields. */ | |
915 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
916 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
917 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
918 | ||
2398f2c6 PZ |
919 | u64 last_update; |
920 | ||
1da177e4 LT |
921 | #ifdef CONFIG_SCHEDSTATS |
922 | /* load_balance() stats */ | |
480b9434 KC |
923 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
924 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
925 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
926 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
927 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
928 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
929 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
930 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
931 | |
932 | /* Active load balancing */ | |
480b9434 KC |
933 | unsigned int alb_count; |
934 | unsigned int alb_failed; | |
935 | unsigned int alb_pushed; | |
1da177e4 | 936 | |
68767a0a | 937 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
938 | unsigned int sbe_count; |
939 | unsigned int sbe_balanced; | |
940 | unsigned int sbe_pushed; | |
1da177e4 | 941 | |
68767a0a | 942 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
943 | unsigned int sbf_count; |
944 | unsigned int sbf_balanced; | |
945 | unsigned int sbf_pushed; | |
68767a0a | 946 | |
1da177e4 | 947 | /* try_to_wake_up() stats */ |
480b9434 KC |
948 | unsigned int ttwu_wake_remote; |
949 | unsigned int ttwu_move_affine; | |
950 | unsigned int ttwu_move_balance; | |
1da177e4 | 951 | #endif |
a5d8c348 IM |
952 | #ifdef CONFIG_SCHED_DEBUG |
953 | char *name; | |
954 | #endif | |
dce840a0 PZ |
955 | union { |
956 | void *private; /* used during construction */ | |
957 | struct rcu_head rcu; /* used during destruction */ | |
958 | }; | |
6c99e9ad | 959 | |
669c55e9 | 960 | unsigned int span_weight; |
4200efd9 IM |
961 | /* |
962 | * Span of all CPUs in this domain. | |
963 | * | |
964 | * NOTE: this field is variable length. (Allocated dynamically | |
965 | * by attaching extra space to the end of the structure, | |
966 | * depending on how many CPUs the kernel has booted up with) | |
4200efd9 IM |
967 | */ |
968 | unsigned long span[0]; | |
1da177e4 LT |
969 | }; |
970 | ||
758b2cdc RR |
971 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
972 | { | |
6c99e9ad | 973 | return to_cpumask(sd->span); |
758b2cdc RR |
974 | } |
975 | ||
acc3f5d7 | 976 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 977 | struct sched_domain_attr *dattr_new); |
029190c5 | 978 | |
acc3f5d7 RR |
979 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
980 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
981 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
982 | ||
06aaf76a IM |
983 | /* Test a flag in parent sched domain */ |
984 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
985 | { | |
986 | if (sd->parent && (sd->parent->flags & flag)) | |
987 | return 1; | |
988 | ||
989 | return 0; | |
990 | } | |
029190c5 | 991 | |
47fe38fc PZ |
992 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
993 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
994 | ||
39be3501 PZ |
995 | bool cpus_share_cache(int this_cpu, int that_cpu); |
996 | ||
1b427c15 | 997 | #else /* CONFIG_SMP */ |
1da177e4 | 998 | |
1b427c15 | 999 | struct sched_domain_attr; |
d02c7a8c | 1000 | |
1b427c15 | 1001 | static inline void |
acc3f5d7 | 1002 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1003 | struct sched_domain_attr *dattr_new) |
1004 | { | |
d02c7a8c | 1005 | } |
39be3501 PZ |
1006 | |
1007 | static inline bool cpus_share_cache(int this_cpu, int that_cpu) | |
1008 | { | |
1009 | return true; | |
1010 | } | |
1011 | ||
1b427c15 | 1012 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1013 | |
47fe38fc | 1014 | |
1da177e4 | 1015 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1016 | |
1da177e4 | 1017 | |
383f2835 | 1018 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1019 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1020 | #else |
1021 | static inline void prefetch_stack(struct task_struct *t) { } | |
1022 | #endif | |
1da177e4 LT |
1023 | |
1024 | struct audit_context; /* See audit.c */ | |
1025 | struct mempolicy; | |
b92ce558 | 1026 | struct pipe_inode_info; |
4865ecf1 | 1027 | struct uts_namespace; |
1da177e4 | 1028 | |
20b8a59f IM |
1029 | struct rq; |
1030 | struct sched_domain; | |
1031 | ||
7d478721 PZ |
1032 | /* |
1033 | * wake flags | |
1034 | */ | |
1035 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1036 | #define WF_FORK 0x02 /* child wakeup after fork */ |
f339b9dc | 1037 | #define WF_MIGRATED 0x04 /* internal use, task got migrated */ |
7d478721 | 1038 | |
371fd7e7 | 1039 | #define ENQUEUE_WAKEUP 1 |
74f8e4b2 PZ |
1040 | #define ENQUEUE_HEAD 2 |
1041 | #ifdef CONFIG_SMP | |
1042 | #define ENQUEUE_WAKING 4 /* sched_class::task_waking was called */ | |
1043 | #else | |
1044 | #define ENQUEUE_WAKING 0 | |
1045 | #endif | |
371fd7e7 PZ |
1046 | |
1047 | #define DEQUEUE_SLEEP 1 | |
1048 | ||
20b8a59f | 1049 | struct sched_class { |
5522d5d5 | 1050 | const struct sched_class *next; |
20b8a59f | 1051 | |
371fd7e7 PZ |
1052 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
1053 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
4530d7ab | 1054 | void (*yield_task) (struct rq *rq); |
d95f4122 | 1055 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); |
20b8a59f | 1056 | |
7d478721 | 1057 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1058 | |
fb8d4724 | 1059 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1060 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1061 | |
681f3e68 | 1062 | #ifdef CONFIG_SMP |
7608dec2 | 1063 | int (*select_task_rq)(struct task_struct *p, int sd_flag, int flags); |
4ce72a2c | 1064 | |
9a897c5a SR |
1065 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1066 | void (*post_schedule) (struct rq *this_rq); | |
74f8e4b2 | 1067 | void (*task_waking) (struct task_struct *task); |
efbbd05a | 1068 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); |
e1d1484f | 1069 | |
cd8ba7cd | 1070 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1071 | const struct cpumask *newmask); |
57d885fe | 1072 | |
1f11eb6a GH |
1073 | void (*rq_online)(struct rq *rq); |
1074 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1075 | #endif |
1076 | ||
1077 | void (*set_curr_task) (struct rq *rq); | |
1078 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
cd29fe6f | 1079 | void (*task_fork) (struct task_struct *p); |
cb469845 | 1080 | |
da7a735e PZ |
1081 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
1082 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
cb469845 | 1083 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
da7a735e | 1084 | int oldprio); |
810b3817 | 1085 | |
dba091b9 TG |
1086 | unsigned int (*get_rr_interval) (struct rq *rq, |
1087 | struct task_struct *task); | |
0d721cea | 1088 | |
810b3817 | 1089 | #ifdef CONFIG_FAIR_GROUP_SCHED |
b2b5ce02 | 1090 | void (*task_move_group) (struct task_struct *p, int on_rq); |
810b3817 | 1091 | #endif |
20b8a59f IM |
1092 | }; |
1093 | ||
1094 | struct load_weight { | |
1095 | unsigned long weight, inv_weight; | |
1096 | }; | |
1097 | ||
94c18227 | 1098 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1099 | struct sched_statistics { |
20b8a59f | 1100 | u64 wait_start; |
94c18227 | 1101 | u64 wait_max; |
6d082592 AV |
1102 | u64 wait_count; |
1103 | u64 wait_sum; | |
8f0dfc34 AV |
1104 | u64 iowait_count; |
1105 | u64 iowait_sum; | |
94c18227 | 1106 | |
20b8a59f | 1107 | u64 sleep_start; |
20b8a59f | 1108 | u64 sleep_max; |
94c18227 IM |
1109 | s64 sum_sleep_runtime; |
1110 | ||
1111 | u64 block_start; | |
20b8a59f IM |
1112 | u64 block_max; |
1113 | u64 exec_max; | |
eba1ed4b | 1114 | u64 slice_max; |
cc367732 | 1115 | |
cc367732 IM |
1116 | u64 nr_migrations_cold; |
1117 | u64 nr_failed_migrations_affine; | |
1118 | u64 nr_failed_migrations_running; | |
1119 | u64 nr_failed_migrations_hot; | |
1120 | u64 nr_forced_migrations; | |
cc367732 IM |
1121 | |
1122 | u64 nr_wakeups; | |
1123 | u64 nr_wakeups_sync; | |
1124 | u64 nr_wakeups_migrate; | |
1125 | u64 nr_wakeups_local; | |
1126 | u64 nr_wakeups_remote; | |
1127 | u64 nr_wakeups_affine; | |
1128 | u64 nr_wakeups_affine_attempts; | |
1129 | u64 nr_wakeups_passive; | |
1130 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1131 | }; |
1132 | #endif | |
1133 | ||
1134 | struct sched_entity { | |
1135 | struct load_weight load; /* for load-balancing */ | |
1136 | struct rb_node run_node; | |
1137 | struct list_head group_node; | |
1138 | unsigned int on_rq; | |
1139 | ||
1140 | u64 exec_start; | |
1141 | u64 sum_exec_runtime; | |
1142 | u64 vruntime; | |
1143 | u64 prev_sum_exec_runtime; | |
1144 | ||
41acab88 LDM |
1145 | u64 nr_migrations; |
1146 | ||
41acab88 LDM |
1147 | #ifdef CONFIG_SCHEDSTATS |
1148 | struct sched_statistics statistics; | |
94c18227 IM |
1149 | #endif |
1150 | ||
20b8a59f IM |
1151 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1152 | struct sched_entity *parent; | |
1153 | /* rq on which this entity is (to be) queued: */ | |
1154 | struct cfs_rq *cfs_rq; | |
1155 | /* rq "owned" by this entity/group: */ | |
1156 | struct cfs_rq *my_q; | |
1157 | #endif | |
1158 | }; | |
70b97a7f | 1159 | |
fa717060 PZ |
1160 | struct sched_rt_entity { |
1161 | struct list_head run_list; | |
78f2c7db | 1162 | unsigned long timeout; |
bee367ed | 1163 | unsigned int time_slice; |
6f505b16 | 1164 | |
58d6c2d7 | 1165 | struct sched_rt_entity *back; |
052f1dc7 | 1166 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1167 | struct sched_rt_entity *parent; |
1168 | /* rq on which this entity is (to be) queued: */ | |
1169 | struct rt_rq *rt_rq; | |
1170 | /* rq "owned" by this entity/group: */ | |
1171 | struct rt_rq *my_q; | |
1172 | #endif | |
fa717060 PZ |
1173 | }; |
1174 | ||
de5bdff7 HS |
1175 | /* |
1176 | * default timeslice is 100 msecs (used only for SCHED_RR tasks). | |
1177 | * Timeslices get refilled after they expire. | |
1178 | */ | |
1179 | #define RR_TIMESLICE (100 * HZ / 1000) | |
1180 | ||
86848966 PM |
1181 | struct rcu_node; |
1182 | ||
8dc85d54 PZ |
1183 | enum perf_event_task_context { |
1184 | perf_invalid_context = -1, | |
1185 | perf_hw_context = 0, | |
89a1e187 | 1186 | perf_sw_context, |
8dc85d54 PZ |
1187 | perf_nr_task_contexts, |
1188 | }; | |
1189 | ||
1da177e4 LT |
1190 | struct task_struct { |
1191 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1192 | void *stack; |
1da177e4 | 1193 | atomic_t usage; |
97dc32cd WC |
1194 | unsigned int flags; /* per process flags, defined below */ |
1195 | unsigned int ptrace; | |
1da177e4 | 1196 | |
2dd73a4f | 1197 | #ifdef CONFIG_SMP |
fa14ff4a | 1198 | struct llist_node wake_entry; |
3ca7a440 | 1199 | int on_cpu; |
2dd73a4f | 1200 | #endif |
fd2f4419 | 1201 | int on_rq; |
50e645a8 | 1202 | |
b29739f9 | 1203 | int prio, static_prio, normal_prio; |
c7aceaba | 1204 | unsigned int rt_priority; |
5522d5d5 | 1205 | const struct sched_class *sched_class; |
20b8a59f | 1206 | struct sched_entity se; |
fa717060 | 1207 | struct sched_rt_entity rt; |
8323f26c PZ |
1208 | #ifdef CONFIG_CGROUP_SCHED |
1209 | struct task_group *sched_task_group; | |
1210 | #endif | |
1da177e4 | 1211 | |
e107be36 AK |
1212 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1213 | /* list of struct preempt_notifier: */ | |
1214 | struct hlist_head preempt_notifiers; | |
1215 | #endif | |
1216 | ||
18796aa0 AD |
1217 | /* |
1218 | * fpu_counter contains the number of consecutive context switches | |
1219 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1220 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1221 | * so that after 256 times the counter wraps and the behavior turns | |
1222 | * lazy again; this to deal with bursty apps that only use FPU for | |
1223 | * a short time | |
1224 | */ | |
1225 | unsigned char fpu_counter; | |
6c5c9341 | 1226 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1227 | unsigned int btrace_seq; |
6c5c9341 | 1228 | #endif |
1da177e4 | 1229 | |
97dc32cd | 1230 | unsigned int policy; |
29baa747 | 1231 | int nr_cpus_allowed; |
1da177e4 | 1232 | cpumask_t cpus_allowed; |
1da177e4 | 1233 | |
a57eb940 | 1234 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1235 | int rcu_read_lock_nesting; |
f41d911f | 1236 | char rcu_read_unlock_special; |
f41d911f | 1237 | struct list_head rcu_node_entry; |
a57eb940 PM |
1238 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1239 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1240 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1241 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1242 | #ifdef CONFIG_RCU_BOOST |
1243 | struct rt_mutex *rcu_boost_mutex; | |
1244 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1245 | |
52f17b6c | 1246 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1247 | struct sched_info sched_info; |
1248 | #endif | |
1249 | ||
1250 | struct list_head tasks; | |
806c09a7 | 1251 | #ifdef CONFIG_SMP |
917b627d | 1252 | struct plist_node pushable_tasks; |
806c09a7 | 1253 | #endif |
1da177e4 LT |
1254 | |
1255 | struct mm_struct *mm, *active_mm; | |
4471a675 JK |
1256 | #ifdef CONFIG_COMPAT_BRK |
1257 | unsigned brk_randomized:1; | |
1258 | #endif | |
34e55232 KH |
1259 | #if defined(SPLIT_RSS_COUNTING) |
1260 | struct task_rss_stat rss_stat; | |
1261 | #endif | |
1da177e4 | 1262 | /* task state */ |
97dc32cd | 1263 | int exit_state; |
1da177e4 LT |
1264 | int exit_code, exit_signal; |
1265 | int pdeath_signal; /* The signal sent when the parent dies */ | |
a8f072c1 | 1266 | unsigned int jobctl; /* JOBCTL_*, siglock protected */ |
1da177e4 | 1267 | /* ??? */ |
97dc32cd | 1268 | unsigned int personality; |
1da177e4 | 1269 | unsigned did_exec:1; |
f9ce1f1c KT |
1270 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1271 | * execve */ | |
8f0dfc34 AV |
1272 | unsigned in_iowait:1; |
1273 | ||
259e5e6c AL |
1274 | /* task may not gain privileges */ |
1275 | unsigned no_new_privs:1; | |
ca94c442 LP |
1276 | |
1277 | /* Revert to default priority/policy when forking */ | |
1278 | unsigned sched_reset_on_fork:1; | |
a8e4f2ea | 1279 | unsigned sched_contributes_to_load:1; |
ca94c442 | 1280 | |
1da177e4 LT |
1281 | pid_t pid; |
1282 | pid_t tgid; | |
0a425405 | 1283 | |
1314562a | 1284 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1285 | /* Canary value for the -fstack-protector gcc feature */ |
1286 | unsigned long stack_canary; | |
1314562a | 1287 | #endif |
4d1d61a6 | 1288 | /* |
1da177e4 | 1289 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 1290 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 1291 | * p->real_parent->pid) |
1da177e4 | 1292 | */ |
abd63bc3 KC |
1293 | struct task_struct __rcu *real_parent; /* real parent process */ |
1294 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1295 | /* |
f470021a | 1296 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1297 | */ |
1298 | struct list_head children; /* list of my children */ | |
1299 | struct list_head sibling; /* linkage in my parent's children list */ | |
1300 | struct task_struct *group_leader; /* threadgroup leader */ | |
1301 | ||
f470021a RM |
1302 | /* |
1303 | * ptraced is the list of tasks this task is using ptrace on. | |
1304 | * This includes both natural children and PTRACE_ATTACH targets. | |
1305 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1306 | */ | |
1307 | struct list_head ptraced; | |
1308 | struct list_head ptrace_entry; | |
1309 | ||
1da177e4 | 1310 | /* PID/PID hash table linkage. */ |
92476d7f | 1311 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1312 | struct list_head thread_group; |
1da177e4 LT |
1313 | |
1314 | struct completion *vfork_done; /* for vfork() */ | |
1315 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1316 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1317 | ||
c66f08be | 1318 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1319 | cputime_t gtime; |
d99ca3b9 | 1320 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
9301899b | 1321 | cputime_t prev_utime, prev_stime; |
d99ca3b9 | 1322 | #endif |
1da177e4 | 1323 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1324 | struct timespec start_time; /* monotonic time */ |
1325 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1326 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1327 | unsigned long min_flt, maj_flt; | |
1328 | ||
f06febc9 | 1329 | struct task_cputime cputime_expires; |
1da177e4 LT |
1330 | struct list_head cpu_timers[3]; |
1331 | ||
1332 | /* process credentials */ | |
1b0ba1c9 | 1333 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1334 | * credentials (COW) */ |
1b0ba1c9 | 1335 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1336 | * credentials (COW) */ |
36772092 PBG |
1337 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1338 | - access with [gs]et_task_comm (which lock | |
1339 | it with task_lock()) | |
221af7f8 | 1340 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1341 | /* file system info */ |
1342 | int link_count, total_link_count; | |
3d5b6fcc | 1343 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1344 | /* ipc stuff */ |
1345 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1346 | #endif |
e162b39a | 1347 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1348 | /* hung task detection */ |
82a1fcb9 IM |
1349 | unsigned long last_switch_count; |
1350 | #endif | |
1da177e4 LT |
1351 | /* CPU-specific state of this task */ |
1352 | struct thread_struct thread; | |
1353 | /* filesystem information */ | |
1354 | struct fs_struct *fs; | |
1355 | /* open file information */ | |
1356 | struct files_struct *files; | |
1651e14e | 1357 | /* namespaces */ |
ab516013 | 1358 | struct nsproxy *nsproxy; |
1da177e4 LT |
1359 | /* signal handlers */ |
1360 | struct signal_struct *signal; | |
1361 | struct sighand_struct *sighand; | |
1362 | ||
1363 | sigset_t blocked, real_blocked; | |
f3de272b | 1364 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1365 | struct sigpending pending; |
1366 | ||
1367 | unsigned long sas_ss_sp; | |
1368 | size_t sas_ss_size; | |
1369 | int (*notifier)(void *priv); | |
1370 | void *notifier_data; | |
1371 | sigset_t *notifier_mask; | |
67d12145 | 1372 | struct callback_head *task_works; |
e73f8959 | 1373 | |
1da177e4 | 1374 | struct audit_context *audit_context; |
bfef93a5 | 1375 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1376 | kuid_t loginuid; |
4746ec5b | 1377 | unsigned int sessionid; |
bfef93a5 | 1378 | #endif |
932ecebb | 1379 | struct seccomp seccomp; |
1da177e4 LT |
1380 | |
1381 | /* Thread group tracking */ | |
1382 | u32 parent_exec_id; | |
1383 | u32 self_exec_id; | |
58568d2a MX |
1384 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1385 | * mempolicy */ | |
1da177e4 | 1386 | spinlock_t alloc_lock; |
1da177e4 | 1387 | |
b29739f9 | 1388 | /* Protection of the PI data structures: */ |
1d615482 | 1389 | raw_spinlock_t pi_lock; |
b29739f9 | 1390 | |
23f78d4a IM |
1391 | #ifdef CONFIG_RT_MUTEXES |
1392 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1393 | struct plist_head pi_waiters; | |
1394 | /* Deadlock detection and priority inheritance handling */ | |
1395 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1396 | #endif |
1397 | ||
408894ee IM |
1398 | #ifdef CONFIG_DEBUG_MUTEXES |
1399 | /* mutex deadlock detection */ | |
1400 | struct mutex_waiter *blocked_on; | |
1401 | #endif | |
de30a2b3 IM |
1402 | #ifdef CONFIG_TRACE_IRQFLAGS |
1403 | unsigned int irq_events; | |
de30a2b3 | 1404 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1405 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1406 | unsigned int hardirq_enable_event; |
de30a2b3 | 1407 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1408 | int hardirqs_enabled; |
1409 | int hardirq_context; | |
de30a2b3 | 1410 | unsigned long softirq_disable_ip; |
de30a2b3 | 1411 | unsigned long softirq_enable_ip; |
fa1452e8 | 1412 | unsigned int softirq_disable_event; |
de30a2b3 | 1413 | unsigned int softirq_enable_event; |
fa1452e8 | 1414 | int softirqs_enabled; |
de30a2b3 IM |
1415 | int softirq_context; |
1416 | #endif | |
fbb9ce95 | 1417 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1418 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1419 | u64 curr_chain_key; |
1420 | int lockdep_depth; | |
fbb9ce95 | 1421 | unsigned int lockdep_recursion; |
c7aceaba | 1422 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1423 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1424 | #endif |
408894ee | 1425 | |
1da177e4 LT |
1426 | /* journalling filesystem info */ |
1427 | void *journal_info; | |
1428 | ||
d89d8796 | 1429 | /* stacked block device info */ |
bddd87c7 | 1430 | struct bio_list *bio_list; |
d89d8796 | 1431 | |
73c10101 JA |
1432 | #ifdef CONFIG_BLOCK |
1433 | /* stack plugging */ | |
1434 | struct blk_plug *plug; | |
1435 | #endif | |
1436 | ||
1da177e4 LT |
1437 | /* VM state */ |
1438 | struct reclaim_state *reclaim_state; | |
1439 | ||
1da177e4 LT |
1440 | struct backing_dev_info *backing_dev_info; |
1441 | ||
1442 | struct io_context *io_context; | |
1443 | ||
1444 | unsigned long ptrace_message; | |
1445 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1446 | struct task_io_accounting ioac; |
8f0ab514 | 1447 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1448 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1449 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1450 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1451 | #endif |
1452 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1453 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1454 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1455 | int cpuset_mem_spread_rotor; |
6adef3eb | 1456 | int cpuset_slab_spread_rotor; |
1da177e4 | 1457 | #endif |
ddbcc7e8 | 1458 | #ifdef CONFIG_CGROUPS |
817929ec | 1459 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1460 | struct css_set __rcu *cgroups; |
817929ec PM |
1461 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1462 | struct list_head cg_list; | |
ddbcc7e8 | 1463 | #endif |
42b2dd0a | 1464 | #ifdef CONFIG_FUTEX |
0771dfef | 1465 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1466 | #ifdef CONFIG_COMPAT |
1467 | struct compat_robust_list_head __user *compat_robust_list; | |
1468 | #endif | |
c87e2837 IM |
1469 | struct list_head pi_state_list; |
1470 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1471 | #endif |
cdd6c482 | 1472 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1473 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1474 | struct mutex perf_event_mutex; |
1475 | struct list_head perf_event_list; | |
a63eaf34 | 1476 | #endif |
c7aceaba | 1477 | #ifdef CONFIG_NUMA |
58568d2a | 1478 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1479 | short il_next; |
207205a2 | 1480 | short pref_node_fork; |
42b2dd0a | 1481 | #endif |
e56d0903 | 1482 | struct rcu_head rcu; |
b92ce558 JA |
1483 | |
1484 | /* | |
1485 | * cache last used pipe for splice | |
1486 | */ | |
1487 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1488 | |
1489 | struct page_frag task_frag; | |
1490 | ||
ca74e92b SN |
1491 | #ifdef CONFIG_TASK_DELAY_ACCT |
1492 | struct task_delay_info *delays; | |
f4f154fd AM |
1493 | #endif |
1494 | #ifdef CONFIG_FAULT_INJECTION | |
1495 | int make_it_fail; | |
ca74e92b | 1496 | #endif |
9d823e8f WF |
1497 | /* |
1498 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1499 | * balance_dirty_pages() for some dirty throttling pause | |
1500 | */ | |
1501 | int nr_dirtied; | |
1502 | int nr_dirtied_pause; | |
83712358 | 1503 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1504 | |
9745512c AV |
1505 | #ifdef CONFIG_LATENCYTOP |
1506 | int latency_record_count; | |
1507 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1508 | #endif | |
6976675d AV |
1509 | /* |
1510 | * time slack values; these are used to round up poll() and | |
1511 | * select() etc timeout values. These are in nanoseconds. | |
1512 | */ | |
1513 | unsigned long timer_slack_ns; | |
1514 | unsigned long default_timer_slack_ns; | |
f8d570a4 | 1515 | |
fb52607a | 1516 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1517 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1518 | int curr_ret_stack; |
1519 | /* Stack of return addresses for return function tracing */ | |
1520 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1521 | /* time stamp for last schedule */ |
1522 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1523 | /* |
1524 | * Number of functions that haven't been traced | |
1525 | * because of depth overrun. | |
1526 | */ | |
1527 | atomic_t trace_overrun; | |
380c4b14 FW |
1528 | /* Pause for the tracing */ |
1529 | atomic_t tracing_graph_pause; | |
f201ae23 | 1530 | #endif |
ea4e2bc4 SR |
1531 | #ifdef CONFIG_TRACING |
1532 | /* state flags for use by tracers */ | |
1533 | unsigned long trace; | |
b1cff0ad | 1534 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1535 | unsigned long trace_recursion; |
1536 | #endif /* CONFIG_TRACING */ | |
c255a458 | 1537 | #ifdef CONFIG_MEMCG /* memcg uses this to do batch job */ |
569b846d KH |
1538 | struct memcg_batch_info { |
1539 | int do_batch; /* incremented when batch uncharge started */ | |
1540 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
7ffd4ca7 JW |
1541 | unsigned long nr_pages; /* uncharged usage */ |
1542 | unsigned long memsw_nr_pages; /* uncharged mem+swap usage */ | |
569b846d KH |
1543 | } memcg_batch; |
1544 | #endif | |
bf26c018 FW |
1545 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
1546 | atomic_t ptrace_bp_refcnt; | |
1547 | #endif | |
0326f5a9 SD |
1548 | #ifdef CONFIG_UPROBES |
1549 | struct uprobe_task *utask; | |
0326f5a9 | 1550 | #endif |
1da177e4 LT |
1551 | }; |
1552 | ||
76e6eee0 | 1553 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1554 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1555 | |
e05606d3 IM |
1556 | /* |
1557 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1558 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1559 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1560 | * values are inverted: lower p->prio value means higher priority. | |
1561 | * | |
1562 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1563 | * RT priority to be separate from the value exported to | |
1564 | * user-space. This allows kernel threads to set their | |
1565 | * priority to a value higher than any user task. Note: | |
1566 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1567 | */ | |
1568 | ||
1569 | #define MAX_USER_RT_PRIO 100 | |
1570 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1571 | ||
1572 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1573 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1574 | ||
1575 | static inline int rt_prio(int prio) | |
1576 | { | |
1577 | if (unlikely(prio < MAX_RT_PRIO)) | |
1578 | return 1; | |
1579 | return 0; | |
1580 | } | |
1581 | ||
e868171a | 1582 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1583 | { |
1584 | return rt_prio(p->prio); | |
1585 | } | |
1586 | ||
e868171a | 1587 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1588 | { |
1589 | return task->pids[PIDTYPE_PID].pid; | |
1590 | } | |
1591 | ||
e868171a | 1592 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1593 | { |
1594 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1595 | } | |
1596 | ||
6dda81f4 ON |
1597 | /* |
1598 | * Without tasklist or rcu lock it is not safe to dereference | |
1599 | * the result of task_pgrp/task_session even if task == current, | |
1600 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1601 | */ | |
e868171a | 1602 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1603 | { |
1604 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1605 | } | |
1606 | ||
e868171a | 1607 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1608 | { |
1609 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1610 | } | |
1611 | ||
7af57294 PE |
1612 | struct pid_namespace; |
1613 | ||
1614 | /* | |
1615 | * the helpers to get the task's different pids as they are seen | |
1616 | * from various namespaces | |
1617 | * | |
1618 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1619 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1620 | * current. | |
7af57294 PE |
1621 | * task_xid_nr_ns() : id seen from the ns specified; |
1622 | * | |
1623 | * set_task_vxid() : assigns a virtual id to a task; | |
1624 | * | |
7af57294 PE |
1625 | * see also pid_nr() etc in include/linux/pid.h |
1626 | */ | |
52ee2dfd ON |
1627 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1628 | struct pid_namespace *ns); | |
7af57294 | 1629 | |
e868171a | 1630 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1631 | { |
1632 | return tsk->pid; | |
1633 | } | |
1634 | ||
52ee2dfd ON |
1635 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1636 | struct pid_namespace *ns) | |
1637 | { | |
1638 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1639 | } | |
7af57294 PE |
1640 | |
1641 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1642 | { | |
52ee2dfd | 1643 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1644 | } |
1645 | ||
1646 | ||
e868171a | 1647 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1648 | { |
1649 | return tsk->tgid; | |
1650 | } | |
1651 | ||
2f2a3a46 | 1652 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1653 | |
1654 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1655 | { | |
1656 | return pid_vnr(task_tgid(tsk)); | |
1657 | } | |
1658 | ||
1659 | ||
52ee2dfd ON |
1660 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1661 | struct pid_namespace *ns) | |
7af57294 | 1662 | { |
52ee2dfd | 1663 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1664 | } |
1665 | ||
7af57294 PE |
1666 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1667 | { | |
52ee2dfd | 1668 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1669 | } |
1670 | ||
1671 | ||
52ee2dfd ON |
1672 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1673 | struct pid_namespace *ns) | |
7af57294 | 1674 | { |
52ee2dfd | 1675 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1676 | } |
1677 | ||
7af57294 PE |
1678 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1679 | { | |
52ee2dfd | 1680 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1681 | } |
1682 | ||
1b0f7ffd ON |
1683 | /* obsolete, do not use */ |
1684 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1685 | { | |
1686 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1687 | } | |
7af57294 | 1688 | |
1da177e4 LT |
1689 | /** |
1690 | * pid_alive - check that a task structure is not stale | |
1691 | * @p: Task structure to be checked. | |
1692 | * | |
1693 | * Test if a process is not yet dead (at most zombie state) | |
1694 | * If pid_alive fails, then pointers within the task structure | |
1695 | * can be stale and must not be dereferenced. | |
1696 | */ | |
e868171a | 1697 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1698 | { |
92476d7f | 1699 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1700 | } |
1701 | ||
f400e198 | 1702 | /** |
b460cbc5 | 1703 | * is_global_init - check if a task structure is init |
3260259f H |
1704 | * @tsk: Task structure to be checked. |
1705 | * | |
1706 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1707 | */ |
e868171a | 1708 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1709 | { |
1710 | return tsk->pid == 1; | |
1711 | } | |
b460cbc5 SH |
1712 | |
1713 | /* | |
1714 | * is_container_init: | |
1715 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1716 | */ |
b461cc03 | 1717 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1718 | |
9ec52099 CLG |
1719 | extern struct pid *cad_pid; |
1720 | ||
1da177e4 | 1721 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1722 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1723 | |
158d9ebd | 1724 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1725 | |
1726 | static inline void put_task_struct(struct task_struct *t) | |
1727 | { | |
1728 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1729 | __put_task_struct(t); |
e56d0903 | 1730 | } |
1da177e4 | 1731 | |
d180c5bc | 1732 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
0cf55e1e | 1733 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
49048622 | 1734 | |
1da177e4 LT |
1735 | /* |
1736 | * Per process flags | |
1737 | */ | |
1da177e4 | 1738 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1739 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1740 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1741 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1742 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1743 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1744 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1745 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1746 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1747 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1748 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1749 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
1da177e4 LT |
1750 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1751 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1752 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1753 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
1da177e4 | 1754 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1755 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1756 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1757 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1758 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1759 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1760 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
4db96cf0 | 1761 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1762 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1763 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1764 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
1da177e4 LT |
1765 | |
1766 | /* | |
1767 | * Only the _current_ task can read/write to tsk->flags, but other | |
1768 | * tasks can access tsk->flags in readonly mode for example | |
1769 | * with tsk_used_math (like during threaded core dumping). | |
1770 | * There is however an exception to this rule during ptrace | |
1771 | * or during fork: the ptracer task is allowed to write to the | |
1772 | * child->flags of its traced child (same goes for fork, the parent | |
1773 | * can write to the child->flags), because we're guaranteed the | |
1774 | * child is not running and in turn not changing child->flags | |
1775 | * at the same time the parent does it. | |
1776 | */ | |
1777 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1778 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1779 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1780 | #define set_used_math() set_stopped_child_used_math(current) | |
1781 | #define conditional_stopped_child_used_math(condition, child) \ | |
1782 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1783 | #define conditional_used_math(condition) \ | |
1784 | conditional_stopped_child_used_math(condition, current) | |
1785 | #define copy_to_stopped_child_used_math(child) \ | |
1786 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1787 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1788 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1789 | #define used_math() tsk_used_math(current) | |
1790 | ||
e5c1902e | 1791 | /* |
a8f072c1 | 1792 | * task->jobctl flags |
e5c1902e | 1793 | */ |
a8f072c1 | 1794 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1795 | |
a8f072c1 TH |
1796 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1797 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1798 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1799 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1800 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1801 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1802 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 TH |
1803 | |
1804 | #define JOBCTL_STOP_DEQUEUED (1 << JOBCTL_STOP_DEQUEUED_BIT) | |
1805 | #define JOBCTL_STOP_PENDING (1 << JOBCTL_STOP_PENDING_BIT) | |
1806 | #define JOBCTL_STOP_CONSUME (1 << JOBCTL_STOP_CONSUME_BIT) | |
73ddff2b | 1807 | #define JOBCTL_TRAP_STOP (1 << JOBCTL_TRAP_STOP_BIT) |
fb1d910c | 1808 | #define JOBCTL_TRAP_NOTIFY (1 << JOBCTL_TRAP_NOTIFY_BIT) |
a8f072c1 | 1809 | #define JOBCTL_TRAPPING (1 << JOBCTL_TRAPPING_BIT) |
544b2c91 | 1810 | #define JOBCTL_LISTENING (1 << JOBCTL_LISTENING_BIT) |
a8f072c1 | 1811 | |
fb1d910c | 1812 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1813 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1814 | |
7dd3db54 TH |
1815 | extern bool task_set_jobctl_pending(struct task_struct *task, |
1816 | unsigned int mask); | |
73ddff2b | 1817 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 TH |
1818 | extern void task_clear_jobctl_pending(struct task_struct *task, |
1819 | unsigned int mask); | |
39efa3ef | 1820 | |
a57eb940 | 1821 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1822 | |
1823 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
1aa03f11 | 1824 | #define RCU_READ_UNLOCK_NEED_QS (1 << 1) /* RCU core needs CPU response. */ |
f41d911f PM |
1825 | |
1826 | static inline void rcu_copy_process(struct task_struct *p) | |
1827 | { | |
1828 | p->rcu_read_lock_nesting = 0; | |
1829 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1830 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1831 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1832 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1833 | #ifdef CONFIG_RCU_BOOST | |
1834 | p->rcu_boost_mutex = NULL; | |
1835 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1836 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1837 | } | |
1838 | ||
f41d911f PM |
1839 | #else |
1840 | ||
1841 | static inline void rcu_copy_process(struct task_struct *p) | |
1842 | { | |
1843 | } | |
1844 | ||
1845 | #endif | |
1846 | ||
04e7e951 FW |
1847 | static inline void rcu_switch(struct task_struct *prev, |
1848 | struct task_struct *next) | |
1849 | { | |
1850 | #ifdef CONFIG_RCU_USER_QS | |
1851 | rcu_user_hooks_switch(prev, next); | |
1852 | #endif | |
1853 | } | |
1854 | ||
907aed48 MG |
1855 | static inline void tsk_restore_flags(struct task_struct *task, |
1856 | unsigned long orig_flags, unsigned long flags) | |
1857 | { | |
1858 | task->flags &= ~flags; | |
1859 | task->flags |= orig_flags & flags; | |
1860 | } | |
1861 | ||
1da177e4 | 1862 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1863 | extern void do_set_cpus_allowed(struct task_struct *p, |
1864 | const struct cpumask *new_mask); | |
1865 | ||
cd8ba7cd | 1866 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1867 | const struct cpumask *new_mask); |
1da177e4 | 1868 | #else |
1e1b6c51 KM |
1869 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1870 | const struct cpumask *new_mask) | |
1871 | { | |
1872 | } | |
cd8ba7cd | 1873 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1874 | const struct cpumask *new_mask) |
1da177e4 | 1875 | { |
96f874e2 | 1876 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1877 | return -EINVAL; |
1878 | return 0; | |
1879 | } | |
1880 | #endif | |
e0ad9556 | 1881 | |
5167e8d5 PZ |
1882 | #ifdef CONFIG_NO_HZ |
1883 | void calc_load_enter_idle(void); | |
1884 | void calc_load_exit_idle(void); | |
1885 | #else | |
1886 | static inline void calc_load_enter_idle(void) { } | |
1887 | static inline void calc_load_exit_idle(void) { } | |
1888 | #endif /* CONFIG_NO_HZ */ | |
1889 | ||
e0ad9556 | 1890 | #ifndef CONFIG_CPUMASK_OFFSTACK |
cd8ba7cd MT |
1891 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1892 | { | |
1893 | return set_cpus_allowed_ptr(p, &new_mask); | |
1894 | } | |
e0ad9556 | 1895 | #endif |
1da177e4 | 1896 | |
b342501c | 1897 | /* |
c676329a PZ |
1898 | * Do not use outside of architecture code which knows its limitations. |
1899 | * | |
1900 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1901 | * CPUs, use (which you should not) requires disabling IRQs. | |
1902 | * | |
1903 | * Please use one of the three interfaces below. | |
b342501c | 1904 | */ |
1bbfa6f2 | 1905 | extern unsigned long long notrace sched_clock(void); |
c676329a | 1906 | /* |
489a71b0 | 1907 | * See the comment in kernel/sched/clock.c |
c676329a PZ |
1908 | */ |
1909 | extern u64 cpu_clock(int cpu); | |
1910 | extern u64 local_clock(void); | |
1911 | extern u64 sched_clock_cpu(int cpu); | |
1912 | ||
e436d800 | 1913 | |
c1955a3d | 1914 | extern void sched_clock_init(void); |
3e51f33f | 1915 | |
c1955a3d | 1916 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1917 | static inline void sched_clock_tick(void) |
1918 | { | |
1919 | } | |
1920 | ||
1921 | static inline void sched_clock_idle_sleep_event(void) | |
1922 | { | |
1923 | } | |
1924 | ||
1925 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1926 | { | |
1927 | } | |
1928 | #else | |
c676329a PZ |
1929 | /* |
1930 | * Architectures can set this to 1 if they have specified | |
1931 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1932 | * but then during bootup it turns out that sched_clock() | |
1933 | * is reliable after all: | |
1934 | */ | |
1935 | extern int sched_clock_stable; | |
1936 | ||
3e51f33f PZ |
1937 | extern void sched_clock_tick(void); |
1938 | extern void sched_clock_idle_sleep_event(void); | |
1939 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1940 | #endif | |
1941 | ||
b52bfee4 VP |
1942 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1943 | /* | |
1944 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
1945 | * The reason for this explicit opt-in is not to have perf penalty with | |
1946 | * slow sched_clocks. | |
1947 | */ | |
1948 | extern void enable_sched_clock_irqtime(void); | |
1949 | extern void disable_sched_clock_irqtime(void); | |
1950 | #else | |
1951 | static inline void enable_sched_clock_irqtime(void) {} | |
1952 | static inline void disable_sched_clock_irqtime(void) {} | |
1953 | #endif | |
1954 | ||
36c8b586 | 1955 | extern unsigned long long |
41b86e9c | 1956 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1957 | |
1958 | /* sched_exec is called by processes performing an exec */ | |
1959 | #ifdef CONFIG_SMP | |
1960 | extern void sched_exec(void); | |
1961 | #else | |
1962 | #define sched_exec() {} | |
1963 | #endif | |
1964 | ||
2aa44d05 IM |
1965 | extern void sched_clock_idle_sleep_event(void); |
1966 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1967 | |
1da177e4 LT |
1968 | #ifdef CONFIG_HOTPLUG_CPU |
1969 | extern void idle_task_exit(void); | |
1970 | #else | |
1971 | static inline void idle_task_exit(void) {} | |
1972 | #endif | |
1973 | ||
06d8308c TG |
1974 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
1975 | extern void wake_up_idle_cpu(int cpu); | |
1976 | #else | |
1977 | static inline void wake_up_idle_cpu(int cpu) { } | |
1978 | #endif | |
1979 | ||
21805085 | 1980 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1981 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 1982 | extern unsigned int sysctl_sched_wakeup_granularity; |
bf0f6f24 | 1983 | extern unsigned int sysctl_sched_child_runs_first; |
1983a922 CE |
1984 | |
1985 | enum sched_tunable_scaling { | |
1986 | SCHED_TUNABLESCALING_NONE, | |
1987 | SCHED_TUNABLESCALING_LOG, | |
1988 | SCHED_TUNABLESCALING_LINEAR, | |
1989 | SCHED_TUNABLESCALING_END, | |
1990 | }; | |
1991 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; | |
1992 | ||
2bba22c5 | 1993 | #ifdef CONFIG_SCHED_DEBUG |
da84d961 | 1994 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1995 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 1996 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 1997 | extern unsigned int sysctl_timer_migration; |
a7a4f8a7 | 1998 | extern unsigned int sysctl_sched_shares_window; |
b2be5e96 | 1999 | |
1983a922 | 2000 | int sched_proc_update_handler(struct ctl_table *table, int write, |
8d65af78 | 2001 | void __user *buffer, size_t *length, |
b2be5e96 | 2002 | loff_t *ppos); |
2bd8e6d4 | 2003 | #endif |
eea08f32 AB |
2004 | #ifdef CONFIG_SCHED_DEBUG |
2005 | static inline unsigned int get_sysctl_timer_migration(void) | |
2006 | { | |
2007 | return sysctl_timer_migration; | |
2008 | } | |
2009 | #else | |
2010 | static inline unsigned int get_sysctl_timer_migration(void) | |
2011 | { | |
2012 | return 1; | |
2013 | } | |
2014 | #endif | |
9f0c1e56 PZ |
2015 | extern unsigned int sysctl_sched_rt_period; |
2016 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 2017 | |
d0b27fa7 | 2018 | int sched_rt_handler(struct ctl_table *table, int write, |
8d65af78 | 2019 | void __user *buffer, size_t *lenp, |
d0b27fa7 PZ |
2020 | loff_t *ppos); |
2021 | ||
5091faa4 MG |
2022 | #ifdef CONFIG_SCHED_AUTOGROUP |
2023 | extern unsigned int sysctl_sched_autogroup_enabled; | |
2024 | ||
2025 | extern void sched_autogroup_create_attach(struct task_struct *p); | |
2026 | extern void sched_autogroup_detach(struct task_struct *p); | |
2027 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
2028 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
2029 | #ifdef CONFIG_PROC_FS | |
2030 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
2e5b5b3a | 2031 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int nice); |
5091faa4 MG |
2032 | #endif |
2033 | #else | |
2034 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
2035 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
2036 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
2037 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
2038 | #endif | |
2039 | ||
ec12cb7f PT |
2040 | #ifdef CONFIG_CFS_BANDWIDTH |
2041 | extern unsigned int sysctl_sched_cfs_bandwidth_slice; | |
2042 | #endif | |
2043 | ||
b29739f9 | 2044 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
2045 | extern int rt_mutex_getprio(struct task_struct *p); |
2046 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
2047 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
3c7d5184 TG |
2048 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2049 | { | |
2050 | return tsk->pi_blocked_on != NULL; | |
2051 | } | |
b29739f9 | 2052 | #else |
e868171a | 2053 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
2054 | { |
2055 | return p->normal_prio; | |
2056 | } | |
95e02ca9 | 2057 | # define rt_mutex_adjust_pi(p) do { } while (0) |
3c7d5184 TG |
2058 | static inline bool tsk_is_pi_blocked(struct task_struct *tsk) |
2059 | { | |
2060 | return false; | |
2061 | } | |
b29739f9 IM |
2062 | #endif |
2063 | ||
d95f4122 | 2064 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
2065 | extern void set_user_nice(struct task_struct *p, long nice); |
2066 | extern int task_prio(const struct task_struct *p); | |
2067 | extern int task_nice(const struct task_struct *p); | |
2068 | extern int can_nice(const struct task_struct *p, const int nice); | |
2069 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 2070 | extern int idle_cpu(int cpu); |
fe7de49f KM |
2071 | extern int sched_setscheduler(struct task_struct *, int, |
2072 | const struct sched_param *); | |
961ccddd | 2073 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 2074 | const struct sched_param *); |
36c8b586 | 2075 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
2076 | /** |
2077 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 2078 | * @p: the task in question. |
c4f30608 | 2079 | */ |
7061ca3b | 2080 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 PM |
2081 | { |
2082 | return p->pid == 0; | |
2083 | } | |
36c8b586 IM |
2084 | extern struct task_struct *curr_task(int cpu); |
2085 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
2086 | |
2087 | void yield(void); | |
2088 | ||
2089 | /* | |
2090 | * The default (Linux) execution domain. | |
2091 | */ | |
2092 | extern struct exec_domain default_exec_domain; | |
2093 | ||
2094 | union thread_union { | |
2095 | struct thread_info thread_info; | |
2096 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2097 | }; | |
2098 | ||
2099 | #ifndef __HAVE_ARCH_KSTACK_END | |
2100 | static inline int kstack_end(void *addr) | |
2101 | { | |
2102 | /* Reliable end of stack detection: | |
2103 | * Some APM bios versions misalign the stack | |
2104 | */ | |
2105 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2106 | } | |
2107 | #endif | |
2108 | ||
2109 | extern union thread_union init_thread_union; | |
2110 | extern struct task_struct init_task; | |
2111 | ||
2112 | extern struct mm_struct init_mm; | |
2113 | ||
198fe21b PE |
2114 | extern struct pid_namespace init_pid_ns; |
2115 | ||
2116 | /* | |
2117 | * find a task by one of its numerical ids | |
2118 | * | |
198fe21b PE |
2119 | * find_task_by_pid_ns(): |
2120 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2121 | * find_task_by_vpid(): |
2122 | * finds a task by its virtual pid | |
198fe21b | 2123 | * |
e49859e7 | 2124 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2125 | */ |
2126 | ||
228ebcbe PE |
2127 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2128 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2129 | struct pid_namespace *ns); | |
198fe21b | 2130 | |
8520d7c7 | 2131 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
2132 | |
2133 | /* per-UID process charging. */ | |
7b44ab97 | 2134 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
2135 | static inline struct user_struct *get_uid(struct user_struct *u) |
2136 | { | |
2137 | atomic_inc(&u->__count); | |
2138 | return u; | |
2139 | } | |
2140 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
2141 | |
2142 | #include <asm/current.h> | |
2143 | ||
f0af911a | 2144 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2145 | |
b3c97528 HH |
2146 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2147 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 2148 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
2149 | #ifdef CONFIG_SMP |
2150 | extern void kick_process(struct task_struct *tsk); | |
2151 | #else | |
2152 | static inline void kick_process(struct task_struct *tsk) { } | |
2153 | #endif | |
3e51e3ed | 2154 | extern void sched_fork(struct task_struct *p); |
ad46c2c4 | 2155 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 2156 | |
1da177e4 LT |
2157 | extern void proc_caches_init(void); |
2158 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2159 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2160 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2161 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2162 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2163 | ||
2164 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2165 | { | |
2166 | unsigned long flags; | |
2167 | int ret; | |
2168 | ||
2169 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2170 | ret = dequeue_signal(tsk, mask, info); | |
2171 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2172 | ||
2173 | return ret; | |
53c8f9f1 | 2174 | } |
1da177e4 LT |
2175 | |
2176 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2177 | sigset_t *mask); | |
2178 | extern void unblock_all_signals(void); | |
2179 | extern void release_task(struct task_struct * p); | |
2180 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2181 | extern int force_sigsegv(int, struct task_struct *); |
2182 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2183 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2184 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
d178bc3a SH |
2185 | extern int kill_pid_info_as_cred(int, struct siginfo *, struct pid *, |
2186 | const struct cred *, u32); | |
c4b92fc1 EB |
2187 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2188 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2189 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
86773473 | 2190 | extern __must_check bool do_notify_parent(struct task_struct *, int); |
a7f0765e | 2191 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2192 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2193 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2194 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2195 | extern struct sigqueue *sigqueue_alloc(void); |
2196 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2197 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2198 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2199 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2200 | ||
51a7b448 AV |
2201 | static inline void restore_saved_sigmask(void) |
2202 | { | |
2203 | if (test_and_clear_restore_sigmask()) | |
77097ae5 | 2204 | __set_current_blocked(¤t->saved_sigmask); |
51a7b448 AV |
2205 | } |
2206 | ||
b7f9a11a AV |
2207 | static inline sigset_t *sigmask_to_save(void) |
2208 | { | |
2209 | sigset_t *res = ¤t->blocked; | |
2210 | if (unlikely(test_restore_sigmask())) | |
2211 | res = ¤t->saved_sigmask; | |
2212 | return res; | |
2213 | } | |
2214 | ||
9ec52099 CLG |
2215 | static inline int kill_cad_pid(int sig, int priv) |
2216 | { | |
2217 | return kill_pid(cad_pid, sig, priv); | |
2218 | } | |
2219 | ||
1da177e4 LT |
2220 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2221 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2222 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2223 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2224 | ||
2a855dd0 SAS |
2225 | /* |
2226 | * True if we are on the alternate signal stack. | |
2227 | */ | |
1da177e4 LT |
2228 | static inline int on_sig_stack(unsigned long sp) |
2229 | { | |
2a855dd0 SAS |
2230 | #ifdef CONFIG_STACK_GROWSUP |
2231 | return sp >= current->sas_ss_sp && | |
2232 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2233 | #else | |
2234 | return sp > current->sas_ss_sp && | |
2235 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2236 | #endif | |
1da177e4 LT |
2237 | } |
2238 | ||
2239 | static inline int sas_ss_flags(unsigned long sp) | |
2240 | { | |
2241 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2242 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2243 | } | |
2244 | ||
1da177e4 LT |
2245 | /* |
2246 | * Routines for handling mm_structs | |
2247 | */ | |
2248 | extern struct mm_struct * mm_alloc(void); | |
2249 | ||
2250 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2251 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2252 | static inline void mmdrop(struct mm_struct * mm) |
2253 | { | |
6fb43d7b | 2254 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2255 | __mmdrop(mm); |
2256 | } | |
2257 | ||
2258 | /* mmput gets rid of the mappings and all user-space */ | |
2259 | extern void mmput(struct mm_struct *); | |
2260 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2261 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
8cdb878d CY |
2262 | /* |
2263 | * Grab a reference to a task's mm, if it is not already going away | |
2264 | * and ptrace_may_access with the mode parameter passed to it | |
2265 | * succeeds. | |
2266 | */ | |
2267 | extern struct mm_struct *mm_access(struct task_struct *task, unsigned int mode); | |
1da177e4 LT |
2268 | /* Remove the current tasks stale references to the old mm_struct */ |
2269 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2270 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2271 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2272 | |
6f2c55b8 AD |
2273 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2274 | struct task_struct *, struct pt_regs *); | |
1da177e4 LT |
2275 | extern void flush_thread(void); |
2276 | extern void exit_thread(void); | |
2277 | ||
1da177e4 | 2278 | extern void exit_files(struct task_struct *); |
a7e5328a | 2279 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2280 | |
1da177e4 | 2281 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2282 | extern void flush_itimer_signals(void); |
1da177e4 | 2283 | |
9402c95f | 2284 | extern void do_group_exit(int); |
1da177e4 | 2285 | |
1da177e4 LT |
2286 | extern int allow_signal(int); |
2287 | extern int disallow_signal(int); | |
1da177e4 | 2288 | |
d7627467 DH |
2289 | extern int do_execve(const char *, |
2290 | const char __user * const __user *, | |
da3d4c5f | 2291 | const char __user * const __user *); |
1da177e4 | 2292 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
36c8b586 | 2293 | struct task_struct *fork_idle(int); |
2aa3a7f8 AV |
2294 | #ifdef CONFIG_GENERIC_KERNEL_THREAD |
2295 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); | |
2296 | #endif | |
1da177e4 LT |
2297 | |
2298 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2299 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2300 | |
2301 | #ifdef CONFIG_SMP | |
317f3941 | 2302 | void scheduler_ipi(void); |
85ba2d86 | 2303 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2304 | #else |
184748cc | 2305 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
2306 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2307 | long match_state) | |
2308 | { | |
2309 | return 1; | |
2310 | } | |
1da177e4 LT |
2311 | #endif |
2312 | ||
05725f7e JP |
2313 | #define next_task(p) \ |
2314 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2315 | |
2316 | #define for_each_process(p) \ | |
2317 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2318 | ||
5bb459bb | 2319 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2320 | |
1da177e4 LT |
2321 | /* |
2322 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2323 | * 'break' will not work as expected - use goto instead. | |
2324 | */ | |
2325 | #define do_each_thread(g, t) \ | |
2326 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2327 | ||
2328 | #define while_each_thread(g, t) \ | |
2329 | while ((t = next_thread(t)) != g) | |
2330 | ||
7e49827c ON |
2331 | static inline int get_nr_threads(struct task_struct *tsk) |
2332 | { | |
b3ac022c | 2333 | return tsk->signal->nr_threads; |
7e49827c ON |
2334 | } |
2335 | ||
087806b1 ON |
2336 | static inline bool thread_group_leader(struct task_struct *p) |
2337 | { | |
2338 | return p->exit_signal >= 0; | |
2339 | } | |
1da177e4 | 2340 | |
0804ef4b EB |
2341 | /* Do to the insanities of de_thread it is possible for a process |
2342 | * to have the pid of the thread group leader without actually being | |
2343 | * the thread group leader. For iteration through the pids in proc | |
2344 | * all we care about is that we have a task with the appropriate | |
2345 | * pid, we don't actually care if we have the right task. | |
2346 | */ | |
e868171a | 2347 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2348 | { |
2349 | return p->pid == p->tgid; | |
2350 | } | |
2351 | ||
bac0abd6 PE |
2352 | static inline |
2353 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2354 | { | |
2355 | return p1->tgid == p2->tgid; | |
2356 | } | |
2357 | ||
36c8b586 | 2358 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2359 | { |
05725f7e JP |
2360 | return list_entry_rcu(p->thread_group.next, |
2361 | struct task_struct, thread_group); | |
47e65328 ON |
2362 | } |
2363 | ||
e868171a | 2364 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2365 | { |
47e65328 | 2366 | return list_empty(&p->thread_group); |
1da177e4 LT |
2367 | } |
2368 | ||
2369 | #define delay_group_leader(p) \ | |
2370 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2371 | ||
1da177e4 | 2372 | /* |
260ea101 | 2373 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2374 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2375 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2376 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2377 | * |
2378 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2379 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2380 | * neither inside nor outside. | |
2381 | */ | |
2382 | static inline void task_lock(struct task_struct *p) | |
2383 | { | |
2384 | spin_lock(&p->alloc_lock); | |
2385 | } | |
2386 | ||
2387 | static inline void task_unlock(struct task_struct *p) | |
2388 | { | |
2389 | spin_unlock(&p->alloc_lock); | |
2390 | } | |
2391 | ||
b8ed374e | 2392 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2393 | unsigned long *flags); |
2394 | ||
9388dc30 AV |
2395 | static inline struct sighand_struct *lock_task_sighand(struct task_struct *tsk, |
2396 | unsigned long *flags) | |
2397 | { | |
2398 | struct sighand_struct *ret; | |
2399 | ||
2400 | ret = __lock_task_sighand(tsk, flags); | |
2401 | (void)__cond_lock(&tsk->sighand->siglock, ret); | |
2402 | return ret; | |
2403 | } | |
b8ed374e | 2404 | |
f63ee72e ON |
2405 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2406 | unsigned long *flags) | |
2407 | { | |
2408 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2409 | } | |
2410 | ||
4714d1d3 | 2411 | #ifdef CONFIG_CGROUPS |
257058ae | 2412 | static inline void threadgroup_change_begin(struct task_struct *tsk) |
4714d1d3 | 2413 | { |
257058ae | 2414 | down_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2415 | } |
257058ae | 2416 | static inline void threadgroup_change_end(struct task_struct *tsk) |
4714d1d3 | 2417 | { |
257058ae | 2418 | up_read(&tsk->signal->group_rwsem); |
4714d1d3 | 2419 | } |
77e4ef99 TH |
2420 | |
2421 | /** | |
2422 | * threadgroup_lock - lock threadgroup | |
2423 | * @tsk: member task of the threadgroup to lock | |
2424 | * | |
2425 | * Lock the threadgroup @tsk belongs to. No new task is allowed to enter | |
2426 | * and member tasks aren't allowed to exit (as indicated by PF_EXITING) or | |
2427 | * perform exec. This is useful for cases where the threadgroup needs to | |
2428 | * stay stable across blockable operations. | |
2429 | * | |
2430 | * fork and exit paths explicitly call threadgroup_change_{begin|end}() for | |
2431 | * synchronization. While held, no new task will be added to threadgroup | |
2432 | * and no existing live task will have its PF_EXITING set. | |
2433 | * | |
2434 | * During exec, a task goes and puts its thread group through unusual | |
2435 | * changes. After de-threading, exclusive access is assumed to resources | |
2436 | * which are usually shared by tasks in the same group - e.g. sighand may | |
2437 | * be replaced with a new one. Also, the exec'ing task takes over group | |
2438 | * leader role including its pid. Exclude these changes while locked by | |
2439 | * grabbing cred_guard_mutex which is used to synchronize exec path. | |
2440 | */ | |
257058ae | 2441 | static inline void threadgroup_lock(struct task_struct *tsk) |
4714d1d3 | 2442 | { |
77e4ef99 TH |
2443 | /* |
2444 | * exec uses exit for de-threading nesting group_rwsem inside | |
2445 | * cred_guard_mutex. Grab cred_guard_mutex first. | |
2446 | */ | |
2447 | mutex_lock(&tsk->signal->cred_guard_mutex); | |
257058ae | 2448 | down_write(&tsk->signal->group_rwsem); |
4714d1d3 | 2449 | } |
77e4ef99 TH |
2450 | |
2451 | /** | |
2452 | * threadgroup_unlock - unlock threadgroup | |
2453 | * @tsk: member task of the threadgroup to unlock | |
2454 | * | |
2455 | * Reverse threadgroup_lock(). | |
2456 | */ | |
257058ae | 2457 | static inline void threadgroup_unlock(struct task_struct *tsk) |
4714d1d3 | 2458 | { |
257058ae | 2459 | up_write(&tsk->signal->group_rwsem); |
77e4ef99 | 2460 | mutex_unlock(&tsk->signal->cred_guard_mutex); |
4714d1d3 BB |
2461 | } |
2462 | #else | |
257058ae TH |
2463 | static inline void threadgroup_change_begin(struct task_struct *tsk) {} |
2464 | static inline void threadgroup_change_end(struct task_struct *tsk) {} | |
2465 | static inline void threadgroup_lock(struct task_struct *tsk) {} | |
2466 | static inline void threadgroup_unlock(struct task_struct *tsk) {} | |
4714d1d3 BB |
2467 | #endif |
2468 | ||
f037360f AV |
2469 | #ifndef __HAVE_THREAD_FUNCTIONS |
2470 | ||
f7e4217b RZ |
2471 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2472 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2473 | |
10ebffde AV |
2474 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2475 | { | |
2476 | *task_thread_info(p) = *task_thread_info(org); | |
2477 | task_thread_info(p)->task = p; | |
2478 | } | |
2479 | ||
2480 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2481 | { | |
f7e4217b | 2482 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2483 | } |
2484 | ||
f037360f AV |
2485 | #endif |
2486 | ||
8b05c7e6 FT |
2487 | static inline int object_is_on_stack(void *obj) |
2488 | { | |
2489 | void *stack = task_stack_page(current); | |
2490 | ||
2491 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2492 | } | |
2493 | ||
8c9843e5 BH |
2494 | extern void thread_info_cache_init(void); |
2495 | ||
7c9f8861 ES |
2496 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2497 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2498 | { | |
2499 | unsigned long *n = end_of_stack(p); | |
2500 | ||
2501 | do { /* Skip over canary */ | |
2502 | n++; | |
2503 | } while (!*n); | |
2504 | ||
2505 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2506 | } | |
2507 | #endif | |
2508 | ||
1da177e4 LT |
2509 | /* set thread flags in other task's structures |
2510 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2511 | */ | |
2512 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2513 | { | |
a1261f54 | 2514 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2515 | } |
2516 | ||
2517 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2518 | { | |
a1261f54 | 2519 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2520 | } |
2521 | ||
2522 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2523 | { | |
a1261f54 | 2524 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2525 | } |
2526 | ||
2527 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2528 | { | |
a1261f54 | 2529 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2530 | } |
2531 | ||
2532 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2533 | { | |
a1261f54 | 2534 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2535 | } |
2536 | ||
2537 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2538 | { | |
2539 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2540 | } | |
2541 | ||
2542 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2543 | { | |
2544 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2545 | } | |
2546 | ||
8ae121ac GH |
2547 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2548 | { | |
2549 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2550 | } | |
2551 | ||
690cc3ff EB |
2552 | static inline int restart_syscall(void) |
2553 | { | |
2554 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2555 | return -ERESTARTNOINTR; | |
2556 | } | |
2557 | ||
1da177e4 LT |
2558 | static inline int signal_pending(struct task_struct *p) |
2559 | { | |
2560 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2561 | } | |
f776d12d | 2562 | |
d9588725 RM |
2563 | static inline int __fatal_signal_pending(struct task_struct *p) |
2564 | { | |
2565 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2566 | } | |
f776d12d MW |
2567 | |
2568 | static inline int fatal_signal_pending(struct task_struct *p) | |
2569 | { | |
2570 | return signal_pending(p) && __fatal_signal_pending(p); | |
2571 | } | |
2572 | ||
16882c1e ON |
2573 | static inline int signal_pending_state(long state, struct task_struct *p) |
2574 | { | |
2575 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2576 | return 0; | |
2577 | if (!signal_pending(p)) | |
2578 | return 0; | |
2579 | ||
16882c1e ON |
2580 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2581 | } | |
2582 | ||
1da177e4 LT |
2583 | static inline int need_resched(void) |
2584 | { | |
9404ef02 | 2585 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2586 | } |
2587 | ||
2588 | /* | |
2589 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2590 | * explicit rescheduling in places that are safe. The return | |
2591 | * value indicates whether a reschedule was done in fact. | |
2592 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2593 | * cond_resched_softirq() will enable bhs before scheduling. | |
2594 | */ | |
c3921ab7 | 2595 | extern int _cond_resched(void); |
6f80bd98 | 2596 | |
613afbf8 FW |
2597 | #define cond_resched() ({ \ |
2598 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2599 | _cond_resched(); \ | |
2600 | }) | |
6f80bd98 | 2601 | |
613afbf8 FW |
2602 | extern int __cond_resched_lock(spinlock_t *lock); |
2603 | ||
bdd4e85d | 2604 | #ifdef CONFIG_PREEMPT_COUNT |
716a4234 | 2605 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET |
02b67cc3 | 2606 | #else |
716a4234 | 2607 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2608 | #endif |
716a4234 | 2609 | |
613afbf8 | 2610 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2611 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2612 | __cond_resched_lock(lock); \ |
2613 | }) | |
2614 | ||
2615 | extern int __cond_resched_softirq(void); | |
2616 | ||
75e1056f VP |
2617 | #define cond_resched_softirq() ({ \ |
2618 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2619 | __cond_resched_softirq(); \ | |
613afbf8 | 2620 | }) |
1da177e4 LT |
2621 | |
2622 | /* | |
2623 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2624 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2625 | * but a general need for low latency) | |
1da177e4 | 2626 | */ |
95c354fe | 2627 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2628 | { |
95c354fe NP |
2629 | #ifdef CONFIG_PREEMPT |
2630 | return spin_is_contended(lock); | |
2631 | #else | |
1da177e4 | 2632 | return 0; |
95c354fe | 2633 | #endif |
1da177e4 LT |
2634 | } |
2635 | ||
f06febc9 FM |
2636 | /* |
2637 | * Thread group CPU time accounting. | |
2638 | */ | |
4cd4c1b4 | 2639 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2640 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2641 | |
490dea45 | 2642 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2643 | { |
ee30a7b2 | 2644 | raw_spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2645 | } |
2646 | ||
7bb44ade RM |
2647 | /* |
2648 | * Reevaluate whether the task has signals pending delivery. | |
2649 | * Wake the task if so. | |
2650 | * This is required every time the blocked sigset_t changes. | |
2651 | * callers must hold sighand->siglock. | |
2652 | */ | |
2653 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2654 | extern void recalc_sigpending(void); |
2655 | ||
2656 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2657 | ||
2658 | /* | |
2659 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2660 | */ | |
2661 | #ifdef CONFIG_SMP | |
2662 | ||
2663 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2664 | { | |
a1261f54 | 2665 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2666 | } |
2667 | ||
c65cc870 | 2668 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2669 | |
2670 | #else | |
2671 | ||
2672 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2673 | { | |
2674 | return 0; | |
2675 | } | |
2676 | ||
2677 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2678 | { | |
2679 | } | |
2680 | ||
2681 | #endif /* CONFIG_SMP */ | |
2682 | ||
96f874e2 RR |
2683 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2684 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2685 | |
1da177e4 LT |
2686 | extern void normalize_rt_tasks(void); |
2687 | ||
7c941438 | 2688 | #ifdef CONFIG_CGROUP_SCHED |
9b5b7751 | 2689 | |
07e06b01 | 2690 | extern struct task_group root_task_group; |
9b5b7751 | 2691 | |
ec7dc8ac | 2692 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2693 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2694 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2695 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2696 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2697 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2698 | #endif |
2699 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2700 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2701 | long rt_runtime_us); | |
2702 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2703 | extern int sched_group_set_rt_period(struct task_group *tg, |
2704 | long rt_period_us); | |
2705 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2706 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2707 | #endif |
8323f26c | 2708 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2709 | |
54e99124 DG |
2710 | extern int task_can_switch_user(struct user_struct *up, |
2711 | struct task_struct *tsk); | |
2712 | ||
4b98d11b AD |
2713 | #ifdef CONFIG_TASK_XACCT |
2714 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2715 | { | |
940389b8 | 2716 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2717 | } |
2718 | ||
2719 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2720 | { | |
940389b8 | 2721 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2722 | } |
2723 | ||
2724 | static inline void inc_syscr(struct task_struct *tsk) | |
2725 | { | |
940389b8 | 2726 | tsk->ioac.syscr++; |
4b98d11b AD |
2727 | } |
2728 | ||
2729 | static inline void inc_syscw(struct task_struct *tsk) | |
2730 | { | |
940389b8 | 2731 | tsk->ioac.syscw++; |
4b98d11b AD |
2732 | } |
2733 | #else | |
2734 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2735 | { | |
2736 | } | |
2737 | ||
2738 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2739 | { | |
2740 | } | |
2741 | ||
2742 | static inline void inc_syscr(struct task_struct *tsk) | |
2743 | { | |
2744 | } | |
2745 | ||
2746 | static inline void inc_syscw(struct task_struct *tsk) | |
2747 | { | |
2748 | } | |
2749 | #endif | |
2750 | ||
82455257 DH |
2751 | #ifndef TASK_SIZE_OF |
2752 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2753 | #endif | |
2754 | ||
cf475ad2 BS |
2755 | #ifdef CONFIG_MM_OWNER |
2756 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2757 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2758 | #else | |
2759 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2760 | { | |
2761 | } | |
2762 | ||
2763 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2764 | { | |
2765 | } | |
2766 | #endif /* CONFIG_MM_OWNER */ | |
2767 | ||
3e10e716 JS |
2768 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2769 | unsigned int limit) | |
2770 | { | |
2771 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2772 | } | |
2773 | ||
2774 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2775 | unsigned int limit) | |
2776 | { | |
2777 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2778 | } | |
2779 | ||
2780 | static inline unsigned long rlimit(unsigned int limit) | |
2781 | { | |
2782 | return task_rlimit(current, limit); | |
2783 | } | |
2784 | ||
2785 | static inline unsigned long rlimit_max(unsigned int limit) | |
2786 | { | |
2787 | return task_rlimit_max(current, limit); | |
2788 | } | |
2789 | ||
1da177e4 | 2790 | #endif |