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 | |
5c228079 DY |
6 | #include <linux/sched/prio.h> |
7 | ||
1da177e4 LT |
8 | #include <asm/param.h> /* for HZ */ |
9 | ||
1da177e4 LT |
10 | #include <linux/capability.h> |
11 | #include <linux/threads.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/timex.h> | |
15 | #include <linux/jiffies.h> | |
b69339ba | 16 | #include <linux/mutex.h> |
fb00aca4 | 17 | #include <linux/plist.h> |
1da177e4 LT |
18 | #include <linux/rbtree.h> |
19 | #include <linux/thread_info.h> | |
20 | #include <linux/cpumask.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/nodemask.h> | |
c92ff1bd | 23 | #include <linux/mm_types.h> |
92cf2118 | 24 | #include <linux/preempt.h> |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <asm/page.h> |
27 | #include <asm/ptrace.h> | |
1da177e4 LT |
28 | |
29 | #include <linux/smp.h> | |
30 | #include <linux/sem.h> | |
ab602f79 | 31 | #include <linux/shm.h> |
1da177e4 | 32 | #include <linux/signal.h> |
1da177e4 LT |
33 | #include <linux/compiler.h> |
34 | #include <linux/completion.h> | |
f361bf4a | 35 | #include <linux/signal_types.h> |
1da177e4 LT |
36 | #include <linux/pid.h> |
37 | #include <linux/percpu.h> | |
38 | #include <linux/topology.h> | |
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> | |
5c9a8750 | 49 | #include <linux/kcov.h> |
7c3ab738 | 50 | #include <linux/task_io_accounting.h> |
9745512c | 51 | #include <linux/latencytop.h> |
9e2b2dc4 | 52 | #include <linux/cred.h> |
fa14ff4a | 53 | #include <linux/llist.h> |
7b44ab97 | 54 | #include <linux/uidgid.h> |
21caf2fc | 55 | #include <linux/gfp.h> |
fd771233 | 56 | #include <linux/topology.h> |
d4311ff1 | 57 | #include <linux/magic.h> |
7d7efec3 | 58 | #include <linux/cgroup-defs.h> |
a3b6714e DW |
59 | |
60 | #include <asm/processor.h> | |
36d57ac4 | 61 | |
e2d1e2ae IM |
62 | struct sched_attr; |
63 | struct sched_param; | |
d50dde5a | 64 | |
c87e2837 | 65 | struct futex_pi_state; |
286100a6 | 66 | struct robust_list_head; |
bddd87c7 | 67 | struct bio_list; |
5ad4e53b | 68 | struct fs_struct; |
cdd6c482 | 69 | struct perf_event_context; |
73c10101 | 70 | struct blk_plug; |
c4ad8f98 | 71 | struct filename; |
89076bc3 | 72 | struct nameidata; |
1da177e4 | 73 | |
c3edc401 IM |
74 | struct signal_struct; |
75 | struct sighand_struct; | |
76 | ||
1da177e4 LT |
77 | extern unsigned long total_forks; |
78 | extern int nr_threads; | |
1da177e4 LT |
79 | DECLARE_PER_CPU(unsigned long, process_counts); |
80 | extern int nr_processes(void); | |
81 | extern unsigned long nr_running(void); | |
2ee507c4 | 82 | extern bool single_task_running(void); |
1da177e4 | 83 | extern unsigned long nr_iowait(void); |
8c215bd3 | 84 | extern unsigned long nr_iowait_cpu(int cpu); |
372ba8cb | 85 | extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load); |
69d25870 | 86 | |
3289bdb4 | 87 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
1f41906a FW |
88 | extern void cpu_load_update_nohz_start(void); |
89 | extern void cpu_load_update_nohz_stop(void); | |
3289bdb4 | 90 | #else |
1f41906a FW |
91 | static inline void cpu_load_update_nohz_start(void) { } |
92 | static inline void cpu_load_update_nohz_stop(void) { } | |
3289bdb4 | 93 | #endif |
1da177e4 | 94 | |
b637a328 PM |
95 | extern void dump_cpu_task(int cpu); |
96 | ||
43ae34cb IM |
97 | struct seq_file; |
98 | struct cfs_rq; | |
4cf86d77 | 99 | struct task_group; |
43ae34cb IM |
100 | #ifdef CONFIG_SCHED_DEBUG |
101 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
102 | extern void proc_sched_set_task(struct task_struct *p); | |
43ae34cb | 103 | #endif |
1da177e4 | 104 | |
4a8342d2 LT |
105 | /* |
106 | * Task state bitmask. NOTE! These bits are also | |
107 | * encoded in fs/proc/array.c: get_task_state(). | |
108 | * | |
109 | * We have two separate sets of flags: task->state | |
110 | * is about runnability, while task->exit_state are | |
111 | * about the task exiting. Confusing, but this way | |
112 | * modifying one set can't modify the other one by | |
113 | * mistake. | |
114 | */ | |
1da177e4 LT |
115 | #define TASK_RUNNING 0 |
116 | #define TASK_INTERRUPTIBLE 1 | |
117 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
118 | #define __TASK_STOPPED 4 |
119 | #define __TASK_TRACED 8 | |
4a8342d2 | 120 | /* in tsk->exit_state */ |
ad86622b ON |
121 | #define EXIT_DEAD 16 |
122 | #define EXIT_ZOMBIE 32 | |
abd50b39 | 123 | #define EXIT_TRACE (EXIT_ZOMBIE | EXIT_DEAD) |
4a8342d2 | 124 | /* in tsk->state again */ |
af927232 | 125 | #define TASK_DEAD 64 |
f021a3c2 | 126 | #define TASK_WAKEKILL 128 |
e9c84311 | 127 | #define TASK_WAKING 256 |
f2530dc7 | 128 | #define TASK_PARKED 512 |
80ed87c8 | 129 | #define TASK_NOLOAD 1024 |
7dc603c9 PZ |
130 | #define TASK_NEW 2048 |
131 | #define TASK_STATE_MAX 4096 | |
f021a3c2 | 132 | |
7dc603c9 | 133 | #define TASK_STATE_TO_CHAR_STR "RSDTtXZxKWPNn" |
73342151 | 134 | |
642fa448 | 135 | /* Convenience macros for the sake of set_current_state */ |
f021a3c2 MW |
136 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) |
137 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
138 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 139 | |
80ed87c8 PZ |
140 | #define TASK_IDLE (TASK_UNINTERRUPTIBLE | TASK_NOLOAD) |
141 | ||
92a1f4bc MW |
142 | /* Convenience macros for the sake of wake_up */ |
143 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 144 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
145 | |
146 | /* get_task_state() */ | |
147 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 | 148 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
74e37200 | 149 | __TASK_TRACED | EXIT_ZOMBIE | EXIT_DEAD) |
92a1f4bc | 150 | |
f021a3c2 MW |
151 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
152 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
92a1f4bc | 153 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 154 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 155 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 156 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
80ed87c8 PZ |
157 | (task->flags & PF_FROZEN) == 0 && \ |
158 | (task->state & TASK_NOLOAD) == 0) | |
1da177e4 | 159 | |
8eb23b9f PZ |
160 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
161 | ||
8eb23b9f PZ |
162 | #define __set_current_state(state_value) \ |
163 | do { \ | |
164 | current->task_state_change = _THIS_IP_; \ | |
165 | current->state = (state_value); \ | |
166 | } while (0) | |
167 | #define set_current_state(state_value) \ | |
168 | do { \ | |
169 | current->task_state_change = _THIS_IP_; \ | |
a2250238 | 170 | smp_store_mb(current->state, (state_value)); \ |
8eb23b9f PZ |
171 | } while (0) |
172 | ||
173 | #else | |
498d0c57 AM |
174 | /* |
175 | * set_current_state() includes a barrier so that the write of current->state | |
176 | * is correctly serialised wrt the caller's subsequent test of whether to | |
177 | * actually sleep: | |
178 | * | |
a2250238 | 179 | * for (;;) { |
498d0c57 | 180 | * set_current_state(TASK_UNINTERRUPTIBLE); |
a2250238 PZ |
181 | * if (!need_sleep) |
182 | * break; | |
183 | * | |
184 | * schedule(); | |
185 | * } | |
186 | * __set_current_state(TASK_RUNNING); | |
187 | * | |
188 | * If the caller does not need such serialisation (because, for instance, the | |
189 | * condition test and condition change and wakeup are under the same lock) then | |
190 | * use __set_current_state(). | |
191 | * | |
192 | * The above is typically ordered against the wakeup, which does: | |
193 | * | |
194 | * need_sleep = false; | |
195 | * wake_up_state(p, TASK_UNINTERRUPTIBLE); | |
196 | * | |
197 | * Where wake_up_state() (and all other wakeup primitives) imply enough | |
198 | * barriers to order the store of the variable against wakeup. | |
199 | * | |
200 | * Wakeup will do: if (@state & p->state) p->state = TASK_RUNNING, that is, | |
201 | * once it observes the TASK_UNINTERRUPTIBLE store the waking CPU can issue a | |
202 | * TASK_RUNNING store which can collide with __set_current_state(TASK_RUNNING). | |
498d0c57 | 203 | * |
a2250238 | 204 | * This is obviously fine, since they both store the exact same value. |
498d0c57 | 205 | * |
a2250238 | 206 | * Also see the comments of try_to_wake_up(). |
498d0c57 | 207 | */ |
8eb23b9f | 208 | #define __set_current_state(state_value) \ |
1da177e4 | 209 | do { current->state = (state_value); } while (0) |
8eb23b9f | 210 | #define set_current_state(state_value) \ |
b92b8b35 | 211 | smp_store_mb(current->state, (state_value)) |
1da177e4 | 212 | |
8eb23b9f PZ |
213 | #endif |
214 | ||
1da177e4 LT |
215 | /* Task command name length */ |
216 | #define TASK_COMM_LEN 16 | |
217 | ||
1da177e4 LT |
218 | #include <linux/spinlock.h> |
219 | ||
220 | /* | |
221 | * This serializes "schedule()" and also protects | |
222 | * the run-queue from deletions/modifications (but | |
223 | * _adding_ to the beginning of the run-queue has | |
224 | * a separate lock). | |
225 | */ | |
226 | extern rwlock_t tasklist_lock; | |
227 | extern spinlock_t mmlist_lock; | |
228 | ||
36c8b586 | 229 | struct task_struct; |
1da177e4 | 230 | |
db1466b3 PM |
231 | #ifdef CONFIG_PROVE_RCU |
232 | extern int lockdep_tasklist_lock_is_held(void); | |
233 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
234 | ||
1da177e4 LT |
235 | extern void sched_init(void); |
236 | extern void sched_init_smp(void); | |
2d07b255 | 237 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 238 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 239 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 240 | |
3fa0818b RR |
241 | extern cpumask_var_t cpu_isolated_map; |
242 | ||
89f19f04 | 243 | extern int runqueue_is_locked(int cpu); |
017730c1 | 244 | |
3451d024 | 245 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) |
c1cc017c | 246 | extern void nohz_balance_enter_idle(int cpu); |
69e1e811 | 247 | extern void set_cpu_sd_state_idle(void); |
bc7a34b8 | 248 | extern int get_nohz_timer_target(void); |
46cb4b7c | 249 | #else |
c1cc017c | 250 | static inline void nohz_balance_enter_idle(int cpu) { } |
fdaabd80 | 251 | static inline void set_cpu_sd_state_idle(void) { } |
46cb4b7c | 252 | #endif |
1da177e4 | 253 | |
e59e2ae2 | 254 | /* |
39bc89fd | 255 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
256 | */ |
257 | extern void show_state_filter(unsigned long state_filter); | |
258 | ||
259 | static inline void show_state(void) | |
260 | { | |
39bc89fd | 261 | show_state_filter(0); |
e59e2ae2 IM |
262 | } |
263 | ||
1da177e4 LT |
264 | extern void show_regs(struct pt_regs *); |
265 | ||
266 | /* | |
267 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
268 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
269 | * trace (or NULL if the entire call-chain of the task should be shown). | |
270 | */ | |
271 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
272 | ||
1da177e4 LT |
273 | extern void cpu_init (void); |
274 | extern void trap_init(void); | |
275 | extern void update_process_times(int user); | |
276 | extern void scheduler_tick(void); | |
9cf7243d | 277 | extern int sched_cpu_starting(unsigned int cpu); |
40190a78 TG |
278 | extern int sched_cpu_activate(unsigned int cpu); |
279 | extern int sched_cpu_deactivate(unsigned int cpu); | |
1da177e4 | 280 | |
f2785ddb TG |
281 | #ifdef CONFIG_HOTPLUG_CPU |
282 | extern int sched_cpu_dying(unsigned int cpu); | |
283 | #else | |
284 | # define sched_cpu_dying NULL | |
285 | #endif | |
1da177e4 | 286 | |
82a1fcb9 IM |
287 | extern void sched_show_task(struct task_struct *p); |
288 | ||
19cc36c0 | 289 | #ifdef CONFIG_LOCKUP_DETECTOR |
03e0d461 | 290 | extern void touch_softlockup_watchdog_sched(void); |
8446f1d3 | 291 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 292 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 293 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
294 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
295 | void __user *buffer, | |
296 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 297 | extern unsigned int softlockup_panic; |
ac1f5912 | 298 | extern unsigned int hardlockup_panic; |
004417a6 | 299 | void lockup_detector_init(void); |
8446f1d3 | 300 | #else |
03e0d461 TH |
301 | static inline void touch_softlockup_watchdog_sched(void) |
302 | { | |
303 | } | |
8446f1d3 IM |
304 | static inline void touch_softlockup_watchdog(void) |
305 | { | |
306 | } | |
d6ad3e28 JW |
307 | static inline void touch_softlockup_watchdog_sync(void) |
308 | { | |
309 | } | |
04c9167f JF |
310 | static inline void touch_all_softlockup_watchdogs(void) |
311 | { | |
312 | } | |
004417a6 PZ |
313 | static inline void lockup_detector_init(void) |
314 | { | |
315 | } | |
8446f1d3 IM |
316 | #endif |
317 | ||
8b414521 MT |
318 | #ifdef CONFIG_DETECT_HUNG_TASK |
319 | void reset_hung_task_detector(void); | |
320 | #else | |
321 | static inline void reset_hung_task_detector(void) | |
322 | { | |
323 | } | |
324 | #endif | |
325 | ||
1da177e4 LT |
326 | /* Attach to any functions which should be ignored in wchan output. */ |
327 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
328 | |
329 | /* Linker adds these: start and end of __sched functions */ | |
330 | extern char __sched_text_start[], __sched_text_end[]; | |
331 | ||
1da177e4 LT |
332 | /* Is this address in the __sched functions? */ |
333 | extern int in_sched_functions(unsigned long addr); | |
334 | ||
335 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 336 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 337 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 338 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 339 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
69b27baf | 340 | extern signed long schedule_timeout_idle(signed long timeout); |
1da177e4 | 341 | asmlinkage void schedule(void); |
c5491ea7 | 342 | extern void schedule_preempt_disabled(void); |
1da177e4 | 343 | |
10ab5643 TH |
344 | extern int __must_check io_schedule_prepare(void); |
345 | extern void io_schedule_finish(int token); | |
9cff8ade | 346 | extern long io_schedule_timeout(long timeout); |
10ab5643 | 347 | extern void io_schedule(void); |
9cff8ade | 348 | |
9af6528e PZ |
349 | void __noreturn do_task_dead(void); |
350 | ||
ab516013 | 351 | struct nsproxy; |
acce292c | 352 | struct user_namespace; |
1da177e4 | 353 | |
efc1a3b1 DH |
354 | #ifdef CONFIG_MMU |
355 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
356 | extern unsigned long |
357 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
358 | unsigned long, unsigned long); | |
359 | extern unsigned long | |
360 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
361 | unsigned long len, unsigned long pgoff, | |
362 | unsigned long flags); | |
efc1a3b1 DH |
363 | #else |
364 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
365 | #endif | |
1da177e4 | 366 | |
0e464814 | 367 | struct pacct_struct { |
f6ec29a4 KK |
368 | int ac_flag; |
369 | long ac_exitcode; | |
0e464814 | 370 | unsigned long ac_mem; |
d4bc42af | 371 | u64 ac_utime, ac_stime; |
77787bfb | 372 | unsigned long ac_minflt, ac_majflt; |
0e464814 KK |
373 | }; |
374 | ||
42c4ab41 | 375 | struct cpu_itimer { |
858cf3a8 FW |
376 | u64 expires; |
377 | u64 incr; | |
42c4ab41 SG |
378 | }; |
379 | ||
d37f761d | 380 | /** |
9d7fb042 | 381 | * struct prev_cputime - snaphsot of system and user cputime |
d37f761d FW |
382 | * @utime: time spent in user mode |
383 | * @stime: time spent in system mode | |
9d7fb042 | 384 | * @lock: protects the above two fields |
d37f761d | 385 | * |
9d7fb042 PZ |
386 | * Stores previous user/system time values such that we can guarantee |
387 | * monotonicity. | |
d37f761d | 388 | */ |
9d7fb042 PZ |
389 | struct prev_cputime { |
390 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
5613fda9 FW |
391 | u64 utime; |
392 | u64 stime; | |
9d7fb042 PZ |
393 | raw_spinlock_t lock; |
394 | #endif | |
d37f761d FW |
395 | }; |
396 | ||
9d7fb042 PZ |
397 | static inline void prev_cputime_init(struct prev_cputime *prev) |
398 | { | |
399 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE | |
400 | prev->utime = prev->stime = 0; | |
401 | raw_spin_lock_init(&prev->lock); | |
402 | #endif | |
403 | } | |
404 | ||
f06febc9 FM |
405 | /** |
406 | * struct task_cputime - collected CPU time counts | |
5613fda9 FW |
407 | * @utime: time spent in user mode, in nanoseconds |
408 | * @stime: time spent in kernel mode, in nanoseconds | |
f06febc9 | 409 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds |
5ce73a4a | 410 | * |
9d7fb042 PZ |
411 | * This structure groups together three kinds of CPU time that are tracked for |
412 | * threads and thread groups. Most things considering CPU time want to group | |
413 | * these counts together and treat all three of them in parallel. | |
f06febc9 FM |
414 | */ |
415 | struct task_cputime { | |
5613fda9 FW |
416 | u64 utime; |
417 | u64 stime; | |
f06febc9 FM |
418 | unsigned long long sum_exec_runtime; |
419 | }; | |
9d7fb042 | 420 | |
f06febc9 | 421 | /* Alternate field names when used to cache expirations. */ |
f06febc9 | 422 | #define virt_exp utime |
9d7fb042 | 423 | #define prof_exp stime |
f06febc9 FM |
424 | #define sched_exp sum_exec_runtime |
425 | ||
971e8a98 JL |
426 | /* |
427 | * This is the atomic variant of task_cputime, which can be used for | |
428 | * storing and updating task_cputime statistics without locking. | |
429 | */ | |
430 | struct task_cputime_atomic { | |
431 | atomic64_t utime; | |
432 | atomic64_t stime; | |
433 | atomic64_t sum_exec_runtime; | |
434 | }; | |
435 | ||
436 | #define INIT_CPUTIME_ATOMIC \ | |
437 | (struct task_cputime_atomic) { \ | |
438 | .utime = ATOMIC64_INIT(0), \ | |
439 | .stime = ATOMIC64_INIT(0), \ | |
440 | .sum_exec_runtime = ATOMIC64_INIT(0), \ | |
441 | } | |
442 | ||
609ca066 | 443 | #define PREEMPT_DISABLED (PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED) |
a233f112 | 444 | |
c99e6efe | 445 | /* |
87dcbc06 PZ |
446 | * Disable preemption until the scheduler is running -- use an unconditional |
447 | * value so that it also works on !PREEMPT_COUNT kernels. | |
d86ee480 | 448 | * |
87dcbc06 | 449 | * Reset by start_kernel()->sched_init()->init_idle()->init_idle_preempt_count(). |
c99e6efe | 450 | */ |
87dcbc06 | 451 | #define INIT_PREEMPT_COUNT PREEMPT_OFFSET |
a233f112 | 452 | |
c99e6efe | 453 | /* |
609ca066 PZ |
454 | * Initial preempt_count value; reflects the preempt_count schedule invariant |
455 | * which states that during context switches: | |
d86ee480 | 456 | * |
609ca066 PZ |
457 | * preempt_count() == 2*PREEMPT_DISABLE_OFFSET |
458 | * | |
459 | * Note: PREEMPT_DISABLE_OFFSET is 0 for !PREEMPT_COUNT kernels. | |
460 | * Note: See finish_task_switch(). | |
c99e6efe | 461 | */ |
609ca066 | 462 | #define FORK_PREEMPT_COUNT (2*PREEMPT_DISABLE_OFFSET + PREEMPT_ENABLED) |
c99e6efe | 463 | |
f06febc9 | 464 | /** |
4cd4c1b4 | 465 | * struct thread_group_cputimer - thread group interval timer counts |
920ce39f | 466 | * @cputime_atomic: atomic thread group interval timers. |
d5c373eb JL |
467 | * @running: true when there are timers running and |
468 | * @cputime_atomic receives updates. | |
c8d75aa4 JL |
469 | * @checking_timer: true when a thread in the group is in the |
470 | * process of checking for thread group timers. | |
f06febc9 FM |
471 | * |
472 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 473 | * used for thread group CPU timer calculations. |
f06febc9 | 474 | */ |
4cd4c1b4 | 475 | struct thread_group_cputimer { |
71107445 | 476 | struct task_cputime_atomic cputime_atomic; |
d5c373eb | 477 | bool running; |
c8d75aa4 | 478 | bool checking_timer; |
f06febc9 | 479 | }; |
f06febc9 | 480 | |
4714d1d3 | 481 | #include <linux/rwsem.h> |
5091faa4 MG |
482 | struct autogroup; |
483 | ||
1da177e4 LT |
484 | /* |
485 | * Some day this will be a full-fledged user tracking system.. | |
486 | */ | |
487 | struct user_struct { | |
488 | atomic_t __count; /* reference count */ | |
489 | atomic_t processes; /* How many processes does this user have? */ | |
1da177e4 | 490 | atomic_t sigpending; /* How many pending signals does this user have? */ |
4afeff85 EP |
491 | #ifdef CONFIG_FANOTIFY |
492 | atomic_t fanotify_listeners; | |
493 | #endif | |
7ef9964e | 494 | #ifdef CONFIG_EPOLL |
52bd19f7 | 495 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 496 | #endif |
970a8645 | 497 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
498 | /* protected by mq_lock */ |
499 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 500 | #endif |
1da177e4 | 501 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
712f4aad | 502 | unsigned long unix_inflight; /* How many files in flight in unix sockets */ |
759c0114 | 503 | atomic_long_t pipe_bufs; /* how many pages are allocated in pipe buffers */ |
1da177e4 LT |
504 | |
505 | #ifdef CONFIG_KEYS | |
506 | struct key *uid_keyring; /* UID specific keyring */ | |
507 | struct key *session_keyring; /* UID's default session keyring */ | |
508 | #endif | |
509 | ||
510 | /* Hash table maintenance information */ | |
735de223 | 511 | struct hlist_node uidhash_node; |
7b44ab97 | 512 | kuid_t uid; |
24e377a8 | 513 | |
aaac3ba9 | 514 | #if defined(CONFIG_PERF_EVENTS) || defined(CONFIG_BPF_SYSCALL) |
789f90fc PZ |
515 | atomic_long_t locked_vm; |
516 | #endif | |
1da177e4 LT |
517 | }; |
518 | ||
eb41d946 | 519 | extern int uids_sysfs_init(void); |
5cb350ba | 520 | |
7b44ab97 | 521 | extern struct user_struct *find_user(kuid_t); |
1da177e4 LT |
522 | |
523 | extern struct user_struct root_user; | |
524 | #define INIT_USER (&root_user) | |
525 | ||
b6dff3ec | 526 | |
1da177e4 LT |
527 | struct backing_dev_info; |
528 | struct reclaim_state; | |
529 | ||
f6db8347 | 530 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
531 | struct sched_info { |
532 | /* cumulative counters */ | |
2d72376b | 533 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 534 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
535 | |
536 | /* timestamps */ | |
172ba844 BS |
537 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
538 | last_queued; /* when we were last queued to run */ | |
1da177e4 | 539 | }; |
f6db8347 | 540 | #endif /* CONFIG_SCHED_INFO */ |
1da177e4 | 541 | |
47913d4e | 542 | struct task_delay_info; |
52f17b6c CS |
543 | |
544 | static inline int sched_info_on(void) | |
545 | { | |
546 | #ifdef CONFIG_SCHEDSTATS | |
547 | return 1; | |
548 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
549 | extern int delayacct_on; | |
550 | return delayacct_on; | |
551 | #else | |
552 | return 0; | |
ca74e92b | 553 | #endif |
52f17b6c | 554 | } |
ca74e92b | 555 | |
cb251765 MG |
556 | #ifdef CONFIG_SCHEDSTATS |
557 | void force_schedstat_enabled(void); | |
558 | #endif | |
559 | ||
6ecdd749 YD |
560 | /* |
561 | * Integer metrics need fixed point arithmetic, e.g., sched/fair | |
562 | * has a few: load, load_avg, util_avg, freq, and capacity. | |
563 | * | |
564 | * We define a basic fixed point arithmetic range, and then formalize | |
565 | * all these metrics based on that basic range. | |
566 | */ | |
567 | # define SCHED_FIXEDPOINT_SHIFT 10 | |
568 | # define SCHED_FIXEDPOINT_SCALE (1L << SCHED_FIXEDPOINT_SHIFT) | |
569 | ||
1da177e4 | 570 | struct io_context; /* See blkdev.h */ |
1da177e4 | 571 | |
1da177e4 | 572 | |
383f2835 | 573 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 574 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
575 | #else |
576 | static inline void prefetch_stack(struct task_struct *t) { } | |
577 | #endif | |
1da177e4 LT |
578 | |
579 | struct audit_context; /* See audit.c */ | |
580 | struct mempolicy; | |
b92ce558 | 581 | struct pipe_inode_info; |
4865ecf1 | 582 | struct uts_namespace; |
1da177e4 | 583 | |
20b8a59f | 584 | struct load_weight { |
9dbdb155 PZ |
585 | unsigned long weight; |
586 | u32 inv_weight; | |
20b8a59f IM |
587 | }; |
588 | ||
9d89c257 | 589 | /* |
7b595334 YD |
590 | * The load_avg/util_avg accumulates an infinite geometric series |
591 | * (see __update_load_avg() in kernel/sched/fair.c). | |
592 | * | |
593 | * [load_avg definition] | |
594 | * | |
595 | * load_avg = runnable% * scale_load_down(load) | |
596 | * | |
597 | * where runnable% is the time ratio that a sched_entity is runnable. | |
598 | * For cfs_rq, it is the aggregated load_avg of all runnable and | |
9d89c257 | 599 | * blocked sched_entities. |
7b595334 YD |
600 | * |
601 | * load_avg may also take frequency scaling into account: | |
602 | * | |
603 | * load_avg = runnable% * scale_load_down(load) * freq% | |
604 | * | |
605 | * where freq% is the CPU frequency normalized to the highest frequency. | |
606 | * | |
607 | * [util_avg definition] | |
608 | * | |
609 | * util_avg = running% * SCHED_CAPACITY_SCALE | |
610 | * | |
611 | * where running% is the time ratio that a sched_entity is running on | |
612 | * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable | |
613 | * and blocked sched_entities. | |
614 | * | |
615 | * util_avg may also factor frequency scaling and CPU capacity scaling: | |
616 | * | |
617 | * util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity% | |
618 | * | |
619 | * where freq% is the same as above, and capacity% is the CPU capacity | |
620 | * normalized to the greatest capacity (due to uarch differences, etc). | |
621 | * | |
622 | * N.B., the above ratios (runnable%, running%, freq%, and capacity%) | |
623 | * themselves are in the range of [0, 1]. To do fixed point arithmetics, | |
624 | * we therefore scale them to as large a range as necessary. This is for | |
625 | * example reflected by util_avg's SCHED_CAPACITY_SCALE. | |
626 | * | |
627 | * [Overflow issue] | |
628 | * | |
629 | * The 64-bit load_sum can have 4353082796 (=2^64/47742/88761) entities | |
630 | * with the highest load (=88761), always runnable on a single cfs_rq, | |
631 | * and should not overflow as the number already hits PID_MAX_LIMIT. | |
632 | * | |
633 | * For all other cases (including 32-bit kernels), struct load_weight's | |
634 | * weight will overflow first before we do, because: | |
635 | * | |
636 | * Max(load_avg) <= Max(load.weight) | |
637 | * | |
638 | * Then it is the load_weight's responsibility to consider overflow | |
639 | * issues. | |
9d89c257 | 640 | */ |
9d85f21c | 641 | struct sched_avg { |
9d89c257 YD |
642 | u64 last_update_time, load_sum; |
643 | u32 util_sum, period_contrib; | |
644 | unsigned long load_avg, util_avg; | |
9d85f21c PT |
645 | }; |
646 | ||
94c18227 | 647 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 648 | struct sched_statistics { |
20b8a59f | 649 | u64 wait_start; |
94c18227 | 650 | u64 wait_max; |
6d082592 AV |
651 | u64 wait_count; |
652 | u64 wait_sum; | |
8f0dfc34 AV |
653 | u64 iowait_count; |
654 | u64 iowait_sum; | |
94c18227 | 655 | |
20b8a59f | 656 | u64 sleep_start; |
20b8a59f | 657 | u64 sleep_max; |
94c18227 IM |
658 | s64 sum_sleep_runtime; |
659 | ||
660 | u64 block_start; | |
20b8a59f IM |
661 | u64 block_max; |
662 | u64 exec_max; | |
eba1ed4b | 663 | u64 slice_max; |
cc367732 | 664 | |
cc367732 IM |
665 | u64 nr_migrations_cold; |
666 | u64 nr_failed_migrations_affine; | |
667 | u64 nr_failed_migrations_running; | |
668 | u64 nr_failed_migrations_hot; | |
669 | u64 nr_forced_migrations; | |
cc367732 IM |
670 | |
671 | u64 nr_wakeups; | |
672 | u64 nr_wakeups_sync; | |
673 | u64 nr_wakeups_migrate; | |
674 | u64 nr_wakeups_local; | |
675 | u64 nr_wakeups_remote; | |
676 | u64 nr_wakeups_affine; | |
677 | u64 nr_wakeups_affine_attempts; | |
678 | u64 nr_wakeups_passive; | |
679 | u64 nr_wakeups_idle; | |
41acab88 LDM |
680 | }; |
681 | #endif | |
682 | ||
683 | struct sched_entity { | |
684 | struct load_weight load; /* for load-balancing */ | |
685 | struct rb_node run_node; | |
686 | struct list_head group_node; | |
687 | unsigned int on_rq; | |
688 | ||
689 | u64 exec_start; | |
690 | u64 sum_exec_runtime; | |
691 | u64 vruntime; | |
692 | u64 prev_sum_exec_runtime; | |
693 | ||
41acab88 LDM |
694 | u64 nr_migrations; |
695 | ||
41acab88 LDM |
696 | #ifdef CONFIG_SCHEDSTATS |
697 | struct sched_statistics statistics; | |
94c18227 IM |
698 | #endif |
699 | ||
20b8a59f | 700 | #ifdef CONFIG_FAIR_GROUP_SCHED |
fed14d45 | 701 | int depth; |
20b8a59f IM |
702 | struct sched_entity *parent; |
703 | /* rq on which this entity is (to be) queued: */ | |
704 | struct cfs_rq *cfs_rq; | |
705 | /* rq "owned" by this entity/group: */ | |
706 | struct cfs_rq *my_q; | |
707 | #endif | |
8bd75c77 | 708 | |
141965c7 | 709 | #ifdef CONFIG_SMP |
5a107804 JO |
710 | /* |
711 | * Per entity load average tracking. | |
712 | * | |
713 | * Put into separate cache line so it does not | |
714 | * collide with read-mostly values above. | |
715 | */ | |
716 | struct sched_avg avg ____cacheline_aligned_in_smp; | |
9d85f21c | 717 | #endif |
20b8a59f | 718 | }; |
70b97a7f | 719 | |
fa717060 PZ |
720 | struct sched_rt_entity { |
721 | struct list_head run_list; | |
78f2c7db | 722 | unsigned long timeout; |
57d2aa00 | 723 | unsigned long watchdog_stamp; |
bee367ed | 724 | unsigned int time_slice; |
ff77e468 PZ |
725 | unsigned short on_rq; |
726 | unsigned short on_list; | |
6f505b16 | 727 | |
58d6c2d7 | 728 | struct sched_rt_entity *back; |
052f1dc7 | 729 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
730 | struct sched_rt_entity *parent; |
731 | /* rq on which this entity is (to be) queued: */ | |
732 | struct rt_rq *rt_rq; | |
733 | /* rq "owned" by this entity/group: */ | |
734 | struct rt_rq *my_q; | |
735 | #endif | |
fa717060 PZ |
736 | }; |
737 | ||
aab03e05 DF |
738 | struct sched_dl_entity { |
739 | struct rb_node rb_node; | |
740 | ||
741 | /* | |
742 | * Original scheduling parameters. Copied here from sched_attr | |
4027d080 | 743 | * during sched_setattr(), they will remain the same until |
744 | * the next sched_setattr(). | |
aab03e05 DF |
745 | */ |
746 | u64 dl_runtime; /* maximum runtime for each instance */ | |
747 | u64 dl_deadline; /* relative deadline of each instance */ | |
755378a4 | 748 | u64 dl_period; /* separation of two instances (period) */ |
332ac17e | 749 | u64 dl_bw; /* dl_runtime / dl_deadline */ |
aab03e05 DF |
750 | |
751 | /* | |
752 | * Actual scheduling parameters. Initialized with the values above, | |
753 | * they are continously updated during task execution. Note that | |
754 | * the remaining runtime could be < 0 in case we are in overrun. | |
755 | */ | |
756 | s64 runtime; /* remaining runtime for this instance */ | |
757 | u64 deadline; /* absolute deadline for this instance */ | |
758 | unsigned int flags; /* specifying the scheduler behaviour */ | |
759 | ||
760 | /* | |
761 | * Some bool flags: | |
762 | * | |
763 | * @dl_throttled tells if we exhausted the runtime. If so, the | |
764 | * task has to wait for a replenishment to be performed at the | |
765 | * next firing of dl_timer. | |
766 | * | |
2d3d891d DF |
767 | * @dl_boosted tells if we are boosted due to DI. If so we are |
768 | * outside bandwidth enforcement mechanism (but only until we | |
5bfd126e JL |
769 | * exit the critical section); |
770 | * | |
771 | * @dl_yielded tells if task gave up the cpu before consuming | |
772 | * all its available runtime during the last job. | |
aab03e05 | 773 | */ |
72f9f3fd | 774 | int dl_throttled, dl_boosted, dl_yielded; |
aab03e05 DF |
775 | |
776 | /* | |
777 | * Bandwidth enforcement timer. Each -deadline task has its | |
778 | * own bandwidth to be enforced, thus we need one timer per task. | |
779 | */ | |
780 | struct hrtimer dl_timer; | |
781 | }; | |
8bd75c77 | 782 | |
1d082fd0 PM |
783 | union rcu_special { |
784 | struct { | |
8203d6d0 PM |
785 | u8 blocked; |
786 | u8 need_qs; | |
787 | u8 exp_need_qs; | |
788 | u8 pad; /* Otherwise the compiler can store garbage here. */ | |
789 | } b; /* Bits. */ | |
790 | u32 s; /* Set of bits. */ | |
1d082fd0 | 791 | }; |
86848966 PM |
792 | struct rcu_node; |
793 | ||
8dc85d54 PZ |
794 | enum perf_event_task_context { |
795 | perf_invalid_context = -1, | |
796 | perf_hw_context = 0, | |
89a1e187 | 797 | perf_sw_context, |
8dc85d54 PZ |
798 | perf_nr_task_contexts, |
799 | }; | |
800 | ||
eb61baf6 IM |
801 | struct wake_q_node { |
802 | struct wake_q_node *next; | |
803 | }; | |
804 | ||
72b252ae MG |
805 | /* Track pages that require TLB flushes */ |
806 | struct tlbflush_unmap_batch { | |
807 | /* | |
808 | * Each bit set is a CPU that potentially has a TLB entry for one of | |
809 | * the PFNs being flushed. See set_tlb_ubc_flush_pending(). | |
810 | */ | |
811 | struct cpumask cpumask; | |
812 | ||
813 | /* True if any bit in cpumask is set */ | |
814 | bool flush_required; | |
d950c947 MG |
815 | |
816 | /* | |
817 | * If true then the PTE was dirty when unmapped. The entry must be | |
818 | * flushed before IO is initiated or a stale TLB entry potentially | |
819 | * allows an update without redirtying the page. | |
820 | */ | |
821 | bool writable; | |
72b252ae MG |
822 | }; |
823 | ||
1da177e4 | 824 | struct task_struct { |
c65eacbe AL |
825 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
826 | /* | |
827 | * For reasons of header soup (see current_thread_info()), this | |
828 | * must be the first element of task_struct. | |
829 | */ | |
830 | struct thread_info thread_info; | |
831 | #endif | |
1da177e4 | 832 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ |
f7e4217b | 833 | void *stack; |
1da177e4 | 834 | atomic_t usage; |
97dc32cd WC |
835 | unsigned int flags; /* per process flags, defined below */ |
836 | unsigned int ptrace; | |
1da177e4 | 837 | |
2dd73a4f | 838 | #ifdef CONFIG_SMP |
fa14ff4a | 839 | struct llist_node wake_entry; |
3ca7a440 | 840 | int on_cpu; |
c65eacbe AL |
841 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
842 | unsigned int cpu; /* current CPU */ | |
843 | #endif | |
63b0e9ed | 844 | unsigned int wakee_flips; |
62470419 | 845 | unsigned long wakee_flip_decay_ts; |
63b0e9ed | 846 | struct task_struct *last_wakee; |
ac66f547 PZ |
847 | |
848 | int wake_cpu; | |
2dd73a4f | 849 | #endif |
fd2f4419 | 850 | int on_rq; |
50e645a8 | 851 | |
b29739f9 | 852 | int prio, static_prio, normal_prio; |
c7aceaba | 853 | unsigned int rt_priority; |
5522d5d5 | 854 | const struct sched_class *sched_class; |
20b8a59f | 855 | struct sched_entity se; |
fa717060 | 856 | struct sched_rt_entity rt; |
8323f26c PZ |
857 | #ifdef CONFIG_CGROUP_SCHED |
858 | struct task_group *sched_task_group; | |
859 | #endif | |
aab03e05 | 860 | struct sched_dl_entity dl; |
1da177e4 | 861 | |
e107be36 AK |
862 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
863 | /* list of struct preempt_notifier: */ | |
864 | struct hlist_head preempt_notifiers; | |
865 | #endif | |
866 | ||
6c5c9341 | 867 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 868 | unsigned int btrace_seq; |
6c5c9341 | 869 | #endif |
1da177e4 | 870 | |
97dc32cd | 871 | unsigned int policy; |
29baa747 | 872 | int nr_cpus_allowed; |
1da177e4 | 873 | cpumask_t cpus_allowed; |
1da177e4 | 874 | |
a57eb940 | 875 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 876 | int rcu_read_lock_nesting; |
1d082fd0 | 877 | union rcu_special rcu_read_unlock_special; |
f41d911f | 878 | struct list_head rcu_node_entry; |
a57eb940 | 879 | struct rcu_node *rcu_blocked_node; |
28f6569a | 880 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
8315f422 PM |
881 | #ifdef CONFIG_TASKS_RCU |
882 | unsigned long rcu_tasks_nvcsw; | |
883 | bool rcu_tasks_holdout; | |
884 | struct list_head rcu_tasks_holdout_list; | |
176f8f7a | 885 | int rcu_tasks_idle_cpu; |
8315f422 | 886 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
e260be67 | 887 | |
f6db8347 | 888 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
889 | struct sched_info sched_info; |
890 | #endif | |
891 | ||
892 | struct list_head tasks; | |
806c09a7 | 893 | #ifdef CONFIG_SMP |
917b627d | 894 | struct plist_node pushable_tasks; |
1baca4ce | 895 | struct rb_node pushable_dl_tasks; |
806c09a7 | 896 | #endif |
1da177e4 LT |
897 | |
898 | struct mm_struct *mm, *active_mm; | |
314ff785 IM |
899 | |
900 | /* Per-thread vma caching: */ | |
901 | struct vmacache vmacache; | |
902 | ||
34e55232 KH |
903 | #if defined(SPLIT_RSS_COUNTING) |
904 | struct task_rss_stat rss_stat; | |
905 | #endif | |
1da177e4 | 906 | /* task state */ |
97dc32cd | 907 | int exit_state; |
1da177e4 LT |
908 | int exit_code, exit_signal; |
909 | int pdeath_signal; /* The signal sent when the parent dies */ | |
e7cc4173 | 910 | unsigned long jobctl; /* JOBCTL_*, siglock protected */ |
9b89f6ba AE |
911 | |
912 | /* Used for emulating ABI behavior of previous Linux versions */ | |
97dc32cd | 913 | unsigned int personality; |
9b89f6ba | 914 | |
be958bdc | 915 | /* scheduler bits, serialized by scheduler locks */ |
ca94c442 | 916 | unsigned sched_reset_on_fork:1; |
a8e4f2ea | 917 | unsigned sched_contributes_to_load:1; |
ff303e66 | 918 | unsigned sched_migrated:1; |
b7e7ade3 | 919 | unsigned sched_remote_wakeup:1; |
be958bdc PZ |
920 | unsigned :0; /* force alignment to the next boundary */ |
921 | ||
922 | /* unserialized, strictly 'current' */ | |
923 | unsigned in_execve:1; /* bit to tell LSMs we're in execve */ | |
924 | unsigned in_iowait:1; | |
7e781418 AL |
925 | #if !defined(TIF_RESTORE_SIGMASK) |
926 | unsigned restore_sigmask:1; | |
927 | #endif | |
626ebc41 TH |
928 | #ifdef CONFIG_MEMCG |
929 | unsigned memcg_may_oom:1; | |
127424c8 | 930 | #ifndef CONFIG_SLOB |
6f185c29 VD |
931 | unsigned memcg_kmem_skip_account:1; |
932 | #endif | |
127424c8 | 933 | #endif |
ff303e66 PZ |
934 | #ifdef CONFIG_COMPAT_BRK |
935 | unsigned brk_randomized:1; | |
936 | #endif | |
6f185c29 | 937 | |
1d4457f9 KC |
938 | unsigned long atomic_flags; /* Flags needing atomic access. */ |
939 | ||
f56141e3 AL |
940 | struct restart_block restart_block; |
941 | ||
1da177e4 LT |
942 | pid_t pid; |
943 | pid_t tgid; | |
0a425405 | 944 | |
1314562a | 945 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
946 | /* Canary value for the -fstack-protector gcc feature */ |
947 | unsigned long stack_canary; | |
1314562a | 948 | #endif |
4d1d61a6 | 949 | /* |
1da177e4 | 950 | * pointers to (original) parent process, youngest child, younger sibling, |
4d1d61a6 | 951 | * older sibling, respectively. (p->father can be replaced with |
f470021a | 952 | * p->real_parent->pid) |
1da177e4 | 953 | */ |
abd63bc3 KC |
954 | struct task_struct __rcu *real_parent; /* real parent process */ |
955 | struct task_struct __rcu *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 956 | /* |
f470021a | 957 | * children/sibling forms the list of my natural children |
1da177e4 LT |
958 | */ |
959 | struct list_head children; /* list of my children */ | |
960 | struct list_head sibling; /* linkage in my parent's children list */ | |
961 | struct task_struct *group_leader; /* threadgroup leader */ | |
962 | ||
f470021a RM |
963 | /* |
964 | * ptraced is the list of tasks this task is using ptrace on. | |
965 | * This includes both natural children and PTRACE_ATTACH targets. | |
966 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
967 | */ | |
968 | struct list_head ptraced; | |
969 | struct list_head ptrace_entry; | |
970 | ||
1da177e4 | 971 | /* PID/PID hash table linkage. */ |
92476d7f | 972 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 973 | struct list_head thread_group; |
0c740d0a | 974 | struct list_head thread_node; |
1da177e4 LT |
975 | |
976 | struct completion *vfork_done; /* for vfork() */ | |
977 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
978 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
979 | ||
5613fda9 | 980 | u64 utime, stime; |
40565b5a | 981 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME |
5613fda9 | 982 | u64 utimescaled, stimescaled; |
40565b5a | 983 | #endif |
16a6d9be | 984 | u64 gtime; |
9d7fb042 | 985 | struct prev_cputime prev_cputime; |
6a61671b | 986 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
b7ce2277 | 987 | seqcount_t vtime_seqcount; |
6a61671b FW |
988 | unsigned long long vtime_snap; |
989 | enum { | |
7098c1ea FW |
990 | /* Task is sleeping or running in a CPU with VTIME inactive */ |
991 | VTIME_INACTIVE = 0, | |
992 | /* Task runs in userspace in a CPU with VTIME active */ | |
6a61671b | 993 | VTIME_USER, |
7098c1ea | 994 | /* Task runs in kernelspace in a CPU with VTIME active */ |
6a61671b FW |
995 | VTIME_SYS, |
996 | } vtime_snap_whence; | |
d99ca3b9 | 997 | #endif |
d027d45d FW |
998 | |
999 | #ifdef CONFIG_NO_HZ_FULL | |
f009a7a7 | 1000 | atomic_t tick_dep_mask; |
d027d45d | 1001 | #endif |
1da177e4 | 1002 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
ccbf62d8 | 1003 | u64 start_time; /* monotonic time in nsec */ |
57e0be04 | 1004 | u64 real_start_time; /* boot based time in nsec */ |
1da177e4 LT |
1005 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1006 | unsigned long min_flt, maj_flt; | |
1007 | ||
b18b6a9c | 1008 | #ifdef CONFIG_POSIX_TIMERS |
f06febc9 | 1009 | struct task_cputime cputime_expires; |
1da177e4 | 1010 | struct list_head cpu_timers[3]; |
b18b6a9c | 1011 | #endif |
1da177e4 LT |
1012 | |
1013 | /* process credentials */ | |
64b875f7 | 1014 | const struct cred __rcu *ptracer_cred; /* Tracer's credentials at attach */ |
1b0ba1c9 | 1015 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1016 | * credentials (COW) */ |
1b0ba1c9 | 1017 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1018 | * credentials (COW) */ |
36772092 PBG |
1019 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1020 | - access with [gs]et_task_comm (which lock | |
1021 | it with task_lock()) | |
221af7f8 | 1022 | - initialized normally by setup_new_exec */ |
1da177e4 | 1023 | /* file system info */ |
756daf26 | 1024 | struct nameidata *nameidata; |
3d5b6fcc | 1025 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1026 | /* ipc stuff */ |
1027 | struct sysv_sem sysvsem; | |
ab602f79 | 1028 | struct sysv_shm sysvshm; |
3d5b6fcc | 1029 | #endif |
e162b39a | 1030 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1031 | /* hung task detection */ |
82a1fcb9 IM |
1032 | unsigned long last_switch_count; |
1033 | #endif | |
1da177e4 LT |
1034 | /* filesystem information */ |
1035 | struct fs_struct *fs; | |
1036 | /* open file information */ | |
1037 | struct files_struct *files; | |
1651e14e | 1038 | /* namespaces */ |
ab516013 | 1039 | struct nsproxy *nsproxy; |
1da177e4 LT |
1040 | /* signal handlers */ |
1041 | struct signal_struct *signal; | |
1042 | struct sighand_struct *sighand; | |
1043 | ||
1044 | sigset_t blocked, real_blocked; | |
f3de272b | 1045 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1046 | struct sigpending pending; |
1047 | ||
1048 | unsigned long sas_ss_sp; | |
1049 | size_t sas_ss_size; | |
2a742138 | 1050 | unsigned sas_ss_flags; |
2e01fabe | 1051 | |
67d12145 | 1052 | struct callback_head *task_works; |
e73f8959 | 1053 | |
1da177e4 | 1054 | struct audit_context *audit_context; |
bfef93a5 | 1055 | #ifdef CONFIG_AUDITSYSCALL |
e1760bd5 | 1056 | kuid_t loginuid; |
4746ec5b | 1057 | unsigned int sessionid; |
bfef93a5 | 1058 | #endif |
932ecebb | 1059 | struct seccomp seccomp; |
1da177e4 LT |
1060 | |
1061 | /* Thread group tracking */ | |
1062 | u32 parent_exec_id; | |
1063 | u32 self_exec_id; | |
58568d2a MX |
1064 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1065 | * mempolicy */ | |
1da177e4 | 1066 | spinlock_t alloc_lock; |
1da177e4 | 1067 | |
b29739f9 | 1068 | /* Protection of the PI data structures: */ |
1d615482 | 1069 | raw_spinlock_t pi_lock; |
b29739f9 | 1070 | |
76751049 PZ |
1071 | struct wake_q_node wake_q; |
1072 | ||
23f78d4a IM |
1073 | #ifdef CONFIG_RT_MUTEXES |
1074 | /* PI waiters blocked on a rt_mutex held by this task */ | |
fb00aca4 PZ |
1075 | struct rb_root pi_waiters; |
1076 | struct rb_node *pi_waiters_leftmost; | |
23f78d4a IM |
1077 | /* Deadlock detection and priority inheritance handling */ |
1078 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1079 | #endif |
1080 | ||
408894ee IM |
1081 | #ifdef CONFIG_DEBUG_MUTEXES |
1082 | /* mutex deadlock detection */ | |
1083 | struct mutex_waiter *blocked_on; | |
1084 | #endif | |
de30a2b3 IM |
1085 | #ifdef CONFIG_TRACE_IRQFLAGS |
1086 | unsigned int irq_events; | |
de30a2b3 | 1087 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1088 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1089 | unsigned int hardirq_enable_event; |
de30a2b3 | 1090 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1091 | int hardirqs_enabled; |
1092 | int hardirq_context; | |
de30a2b3 | 1093 | unsigned long softirq_disable_ip; |
de30a2b3 | 1094 | unsigned long softirq_enable_ip; |
fa1452e8 | 1095 | unsigned int softirq_disable_event; |
de30a2b3 | 1096 | unsigned int softirq_enable_event; |
fa1452e8 | 1097 | int softirqs_enabled; |
de30a2b3 IM |
1098 | int softirq_context; |
1099 | #endif | |
fbb9ce95 | 1100 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1101 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1102 | u64 curr_chain_key; |
1103 | int lockdep_depth; | |
fbb9ce95 | 1104 | unsigned int lockdep_recursion; |
c7aceaba | 1105 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1106 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1107 | #endif |
c6d30853 AR |
1108 | #ifdef CONFIG_UBSAN |
1109 | unsigned int in_ubsan; | |
1110 | #endif | |
408894ee | 1111 | |
1da177e4 LT |
1112 | /* journalling filesystem info */ |
1113 | void *journal_info; | |
1114 | ||
d89d8796 | 1115 | /* stacked block device info */ |
bddd87c7 | 1116 | struct bio_list *bio_list; |
d89d8796 | 1117 | |
73c10101 JA |
1118 | #ifdef CONFIG_BLOCK |
1119 | /* stack plugging */ | |
1120 | struct blk_plug *plug; | |
1121 | #endif | |
1122 | ||
1da177e4 LT |
1123 | /* VM state */ |
1124 | struct reclaim_state *reclaim_state; | |
1125 | ||
1da177e4 LT |
1126 | struct backing_dev_info *backing_dev_info; |
1127 | ||
1128 | struct io_context *io_context; | |
1129 | ||
1130 | unsigned long ptrace_message; | |
1131 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1132 | struct task_io_accounting ioac; |
8f0ab514 | 1133 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1134 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1135 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
605dc2b3 | 1136 | u64 acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1137 | #endif |
1138 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1139 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
cc9a6c87 | 1140 | seqcount_t mems_allowed_seq; /* Seqence no to catch updates */ |
825a46af | 1141 | int cpuset_mem_spread_rotor; |
6adef3eb | 1142 | int cpuset_slab_spread_rotor; |
1da177e4 | 1143 | #endif |
ddbcc7e8 | 1144 | #ifdef CONFIG_CGROUPS |
817929ec | 1145 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1146 | struct css_set __rcu *cgroups; |
817929ec PM |
1147 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1148 | struct list_head cg_list; | |
ddbcc7e8 | 1149 | #endif |
e02737d5 FY |
1150 | #ifdef CONFIG_INTEL_RDT_A |
1151 | int closid; | |
1152 | #endif | |
42b2dd0a | 1153 | #ifdef CONFIG_FUTEX |
0771dfef | 1154 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1155 | #ifdef CONFIG_COMPAT |
1156 | struct compat_robust_list_head __user *compat_robust_list; | |
1157 | #endif | |
c87e2837 IM |
1158 | struct list_head pi_state_list; |
1159 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1160 | #endif |
cdd6c482 | 1161 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1162 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1163 | struct mutex perf_event_mutex; |
1164 | struct list_head perf_event_list; | |
a63eaf34 | 1165 | #endif |
8f47b187 TG |
1166 | #ifdef CONFIG_DEBUG_PREEMPT |
1167 | unsigned long preempt_disable_ip; | |
1168 | #endif | |
c7aceaba | 1169 | #ifdef CONFIG_NUMA |
58568d2a | 1170 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1171 | short il_next; |
207205a2 | 1172 | short pref_node_fork; |
42b2dd0a | 1173 | #endif |
cbee9f88 PZ |
1174 | #ifdef CONFIG_NUMA_BALANCING |
1175 | int numa_scan_seq; | |
cbee9f88 | 1176 | unsigned int numa_scan_period; |
598f0ec0 | 1177 | unsigned int numa_scan_period_max; |
de1c9ce6 | 1178 | int numa_preferred_nid; |
6b9a7460 | 1179 | unsigned long numa_migrate_retry; |
cbee9f88 | 1180 | u64 node_stamp; /* migration stamp */ |
7e2703e6 RR |
1181 | u64 last_task_numa_placement; |
1182 | u64 last_sum_exec_runtime; | |
cbee9f88 | 1183 | struct callback_head numa_work; |
f809ca9a | 1184 | |
8c8a743c PZ |
1185 | struct list_head numa_entry; |
1186 | struct numa_group *numa_group; | |
1187 | ||
745d6147 | 1188 | /* |
44dba3d5 IM |
1189 | * numa_faults is an array split into four regions: |
1190 | * faults_memory, faults_cpu, faults_memory_buffer, faults_cpu_buffer | |
1191 | * in this precise order. | |
1192 | * | |
1193 | * faults_memory: Exponential decaying average of faults on a per-node | |
1194 | * basis. Scheduling placement decisions are made based on these | |
1195 | * counts. The values remain static for the duration of a PTE scan. | |
1196 | * faults_cpu: Track the nodes the process was running on when a NUMA | |
1197 | * hinting fault was incurred. | |
1198 | * faults_memory_buffer and faults_cpu_buffer: Record faults per node | |
1199 | * during the current scan window. When the scan completes, the counts | |
1200 | * in faults_memory and faults_cpu decay and these values are copied. | |
745d6147 | 1201 | */ |
44dba3d5 | 1202 | unsigned long *numa_faults; |
83e1d2cd | 1203 | unsigned long total_numa_faults; |
745d6147 | 1204 | |
04bb2f94 RR |
1205 | /* |
1206 | * numa_faults_locality tracks if faults recorded during the last | |
074c2381 MG |
1207 | * scan window were remote/local or failed to migrate. The task scan |
1208 | * period is adapted based on the locality of the faults with different | |
1209 | * weights depending on whether they were shared or private faults | |
04bb2f94 | 1210 | */ |
074c2381 | 1211 | unsigned long numa_faults_locality[3]; |
04bb2f94 | 1212 | |
b32e86b4 | 1213 | unsigned long numa_pages_migrated; |
cbee9f88 PZ |
1214 | #endif /* CONFIG_NUMA_BALANCING */ |
1215 | ||
72b252ae MG |
1216 | #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH |
1217 | struct tlbflush_unmap_batch tlb_ubc; | |
1218 | #endif | |
1219 | ||
e56d0903 | 1220 | struct rcu_head rcu; |
b92ce558 JA |
1221 | |
1222 | /* | |
1223 | * cache last used pipe for splice | |
1224 | */ | |
1225 | struct pipe_inode_info *splice_pipe; | |
5640f768 ED |
1226 | |
1227 | struct page_frag task_frag; | |
1228 | ||
47913d4e IM |
1229 | #ifdef CONFIG_TASK_DELAY_ACCT |
1230 | struct task_delay_info *delays; | |
f4f154fd | 1231 | #endif |
47913d4e | 1232 | |
f4f154fd AM |
1233 | #ifdef CONFIG_FAULT_INJECTION |
1234 | int make_it_fail; | |
ca74e92b | 1235 | #endif |
9d823e8f WF |
1236 | /* |
1237 | * when (nr_dirtied >= nr_dirtied_pause), it's time to call | |
1238 | * balance_dirty_pages() for some dirty throttling pause | |
1239 | */ | |
1240 | int nr_dirtied; | |
1241 | int nr_dirtied_pause; | |
83712358 | 1242 | unsigned long dirty_paused_when; /* start of a write-and-pause period */ |
9d823e8f | 1243 | |
9745512c AV |
1244 | #ifdef CONFIG_LATENCYTOP |
1245 | int latency_record_count; | |
1246 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1247 | #endif | |
6976675d AV |
1248 | /* |
1249 | * time slack values; these are used to round up poll() and | |
1250 | * select() etc timeout values. These are in nanoseconds. | |
1251 | */ | |
da8b44d5 JS |
1252 | u64 timer_slack_ns; |
1253 | u64 default_timer_slack_ns; | |
f8d570a4 | 1254 | |
0b24becc AR |
1255 | #ifdef CONFIG_KASAN |
1256 | unsigned int kasan_depth; | |
1257 | #endif | |
fb52607a | 1258 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1259 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1260 | int curr_ret_stack; |
1261 | /* Stack of return addresses for return function tracing */ | |
1262 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1263 | /* time stamp for last schedule */ |
1264 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1265 | /* |
1266 | * Number of functions that haven't been traced | |
1267 | * because of depth overrun. | |
1268 | */ | |
1269 | atomic_t trace_overrun; | |
380c4b14 FW |
1270 | /* Pause for the tracing */ |
1271 | atomic_t tracing_graph_pause; | |
f201ae23 | 1272 | #endif |
ea4e2bc4 SR |
1273 | #ifdef CONFIG_TRACING |
1274 | /* state flags for use by tracers */ | |
1275 | unsigned long trace; | |
b1cff0ad | 1276 | /* bitmask and counter of trace recursion */ |
261842b7 SR |
1277 | unsigned long trace_recursion; |
1278 | #endif /* CONFIG_TRACING */ | |
5c9a8750 DV |
1279 | #ifdef CONFIG_KCOV |
1280 | /* Coverage collection mode enabled for this task (0 if disabled). */ | |
1281 | enum kcov_mode kcov_mode; | |
1282 | /* Size of the kcov_area. */ | |
1283 | unsigned kcov_size; | |
1284 | /* Buffer for coverage collection. */ | |
1285 | void *kcov_area; | |
1286 | /* kcov desciptor wired with this task or NULL. */ | |
1287 | struct kcov *kcov; | |
1288 | #endif | |
6f185c29 | 1289 | #ifdef CONFIG_MEMCG |
626ebc41 TH |
1290 | struct mem_cgroup *memcg_in_oom; |
1291 | gfp_t memcg_oom_gfp_mask; | |
1292 | int memcg_oom_order; | |
b23afb93 TH |
1293 | |
1294 | /* number of pages to reclaim on returning to userland */ | |
1295 | unsigned int memcg_nr_pages_over_high; | |
569b846d | 1296 | #endif |
0326f5a9 SD |
1297 | #ifdef CONFIG_UPROBES |
1298 | struct uprobe_task *utask; | |
0326f5a9 | 1299 | #endif |
cafe5635 KO |
1300 | #if defined(CONFIG_BCACHE) || defined(CONFIG_BCACHE_MODULE) |
1301 | unsigned int sequential_io; | |
1302 | unsigned int sequential_io_avg; | |
1303 | #endif | |
8eb23b9f PZ |
1304 | #ifdef CONFIG_DEBUG_ATOMIC_SLEEP |
1305 | unsigned long task_state_change; | |
1306 | #endif | |
8bcbde54 | 1307 | int pagefault_disabled; |
03049269 | 1308 | #ifdef CONFIG_MMU |
29c696e1 | 1309 | struct task_struct *oom_reaper_list; |
03049269 | 1310 | #endif |
ba14a194 AL |
1311 | #ifdef CONFIG_VMAP_STACK |
1312 | struct vm_struct *stack_vm_area; | |
1313 | #endif | |
68f24b08 AL |
1314 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
1315 | /* A live task holds one reference. */ | |
1316 | atomic_t stack_refcount; | |
1317 | #endif | |
0c8c0f03 DH |
1318 | /* CPU-specific state of this task */ |
1319 | struct thread_struct thread; | |
1320 | /* | |
1321 | * WARNING: on x86, 'thread_struct' contains a variable-sized | |
1322 | * structure. It *MUST* be at the end of 'task_struct'. | |
1323 | * | |
1324 | * Do not put anything below here! | |
1325 | */ | |
1da177e4 LT |
1326 | }; |
1327 | ||
5aaeb5c0 IM |
1328 | #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT |
1329 | extern int arch_task_struct_size __read_mostly; | |
1330 | #else | |
1331 | # define arch_task_struct_size (sizeof(struct task_struct)) | |
1332 | #endif | |
0c8c0f03 | 1333 | |
ba14a194 AL |
1334 | #ifdef CONFIG_VMAP_STACK |
1335 | static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t) | |
1336 | { | |
1337 | return t->stack_vm_area; | |
1338 | } | |
1339 | #else | |
1340 | static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t) | |
1341 | { | |
1342 | return NULL; | |
1343 | } | |
1344 | #endif | |
1345 | ||
6688cc05 PZ |
1346 | #define TNF_MIGRATED 0x01 |
1347 | #define TNF_NO_GROUP 0x02 | |
dabe1d99 | 1348 | #define TNF_SHARED 0x04 |
04bb2f94 | 1349 | #define TNF_FAULT_LOCAL 0x08 |
074c2381 | 1350 | #define TNF_MIGRATE_FAIL 0x10 |
6688cc05 | 1351 | |
b18dc5f2 MH |
1352 | static inline bool in_vfork(struct task_struct *tsk) |
1353 | { | |
1354 | bool ret; | |
1355 | ||
1356 | /* | |
1357 | * need RCU to access ->real_parent if CLONE_VM was used along with | |
1358 | * CLONE_PARENT. | |
1359 | * | |
1360 | * We check real_parent->mm == tsk->mm because CLONE_VFORK does not | |
1361 | * imply CLONE_VM | |
1362 | * | |
1363 | * CLONE_VFORK can be used with CLONE_PARENT/CLONE_THREAD and thus | |
1364 | * ->real_parent is not necessarily the task doing vfork(), so in | |
1365 | * theory we can't rely on task_lock() if we want to dereference it. | |
1366 | * | |
1367 | * And in this case we can't trust the real_parent->mm == tsk->mm | |
1368 | * check, it can be false negative. But we do not care, if init or | |
1369 | * another oom-unkillable task does this it should blame itself. | |
1370 | */ | |
1371 | rcu_read_lock(); | |
1372 | ret = tsk->vfork_done && tsk->real_parent->mm == tsk->mm; | |
1373 | rcu_read_unlock(); | |
1374 | ||
1375 | return ret; | |
1376 | } | |
1377 | ||
cbee9f88 | 1378 | #ifdef CONFIG_NUMA_BALANCING |
6688cc05 | 1379 | extern void task_numa_fault(int last_node, int node, int pages, int flags); |
e29cf08b | 1380 | extern pid_t task_numa_group_id(struct task_struct *p); |
1a687c2e | 1381 | extern void set_numabalancing_state(bool enabled); |
82727018 | 1382 | extern void task_numa_free(struct task_struct *p); |
10f39042 RR |
1383 | extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page, |
1384 | int src_nid, int dst_cpu); | |
cbee9f88 | 1385 | #else |
ac8e895b | 1386 | static inline void task_numa_fault(int last_node, int node, int pages, |
6688cc05 | 1387 | int flags) |
cbee9f88 PZ |
1388 | { |
1389 | } | |
e29cf08b MG |
1390 | static inline pid_t task_numa_group_id(struct task_struct *p) |
1391 | { | |
1392 | return 0; | |
1393 | } | |
1a687c2e MG |
1394 | static inline void set_numabalancing_state(bool enabled) |
1395 | { | |
1396 | } | |
82727018 RR |
1397 | static inline void task_numa_free(struct task_struct *p) |
1398 | { | |
1399 | } | |
10f39042 RR |
1400 | static inline bool should_numa_migrate_memory(struct task_struct *p, |
1401 | struct page *page, int src_nid, int dst_cpu) | |
1402 | { | |
1403 | return true; | |
1404 | } | |
cbee9f88 PZ |
1405 | #endif |
1406 | ||
e868171a | 1407 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1408 | { |
1409 | return task->pids[PIDTYPE_PID].pid; | |
1410 | } | |
1411 | ||
e868171a | 1412 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1413 | { |
1414 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1415 | } | |
1416 | ||
6dda81f4 ON |
1417 | /* |
1418 | * Without tasklist or rcu lock it is not safe to dereference | |
1419 | * the result of task_pgrp/task_session even if task == current, | |
1420 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1421 | */ | |
e868171a | 1422 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1423 | { |
1424 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1425 | } | |
1426 | ||
e868171a | 1427 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1428 | { |
1429 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1430 | } | |
1431 | ||
7af57294 PE |
1432 | struct pid_namespace; |
1433 | ||
1434 | /* | |
1435 | * the helpers to get the task's different pids as they are seen | |
1436 | * from various namespaces | |
1437 | * | |
1438 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1439 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1440 | * current. | |
7af57294 PE |
1441 | * task_xid_nr_ns() : id seen from the ns specified; |
1442 | * | |
1443 | * set_task_vxid() : assigns a virtual id to a task; | |
1444 | * | |
7af57294 PE |
1445 | * see also pid_nr() etc in include/linux/pid.h |
1446 | */ | |
52ee2dfd ON |
1447 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1448 | struct pid_namespace *ns); | |
7af57294 | 1449 | |
e868171a | 1450 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1451 | { |
1452 | return tsk->pid; | |
1453 | } | |
1454 | ||
52ee2dfd ON |
1455 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1456 | struct pid_namespace *ns) | |
1457 | { | |
1458 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1459 | } | |
7af57294 PE |
1460 | |
1461 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1462 | { | |
52ee2dfd | 1463 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1464 | } |
1465 | ||
1466 | ||
e868171a | 1467 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1468 | { |
1469 | return tsk->tgid; | |
1470 | } | |
1471 | ||
2f2a3a46 | 1472 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1473 | |
1474 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1475 | { | |
1476 | return pid_vnr(task_tgid(tsk)); | |
1477 | } | |
1478 | ||
1479 | ||
80e0b6e8 | 1480 | static inline int pid_alive(const struct task_struct *p); |
ad36d282 RGB |
1481 | static inline pid_t task_ppid_nr_ns(const struct task_struct *tsk, struct pid_namespace *ns) |
1482 | { | |
1483 | pid_t pid = 0; | |
1484 | ||
1485 | rcu_read_lock(); | |
1486 | if (pid_alive(tsk)) | |
1487 | pid = task_tgid_nr_ns(rcu_dereference(tsk->real_parent), ns); | |
1488 | rcu_read_unlock(); | |
1489 | ||
1490 | return pid; | |
1491 | } | |
1492 | ||
1493 | static inline pid_t task_ppid_nr(const struct task_struct *tsk) | |
1494 | { | |
1495 | return task_ppid_nr_ns(tsk, &init_pid_ns); | |
1496 | } | |
1497 | ||
52ee2dfd ON |
1498 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1499 | struct pid_namespace *ns) | |
7af57294 | 1500 | { |
52ee2dfd | 1501 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1502 | } |
1503 | ||
7af57294 PE |
1504 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1505 | { | |
52ee2dfd | 1506 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1507 | } |
1508 | ||
1509 | ||
52ee2dfd ON |
1510 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1511 | struct pid_namespace *ns) | |
7af57294 | 1512 | { |
52ee2dfd | 1513 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1514 | } |
1515 | ||
7af57294 PE |
1516 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1517 | { | |
52ee2dfd | 1518 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1519 | } |
1520 | ||
1b0f7ffd ON |
1521 | /* obsolete, do not use */ |
1522 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1523 | { | |
1524 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1525 | } | |
7af57294 | 1526 | |
1da177e4 LT |
1527 | /** |
1528 | * pid_alive - check that a task structure is not stale | |
1529 | * @p: Task structure to be checked. | |
1530 | * | |
1531 | * Test if a process is not yet dead (at most zombie state) | |
1532 | * If pid_alive fails, then pointers within the task structure | |
1533 | * can be stale and must not be dereferenced. | |
e69f6186 YB |
1534 | * |
1535 | * Return: 1 if the process is alive. 0 otherwise. | |
1da177e4 | 1536 | */ |
ad36d282 | 1537 | static inline int pid_alive(const struct task_struct *p) |
1da177e4 | 1538 | { |
92476d7f | 1539 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1540 | } |
1541 | ||
f400e198 | 1542 | /** |
570f5241 SS |
1543 | * is_global_init - check if a task structure is init. Since init |
1544 | * is free to have sub-threads we need to check tgid. | |
3260259f H |
1545 | * @tsk: Task structure to be checked. |
1546 | * | |
1547 | * Check if a task structure is the first user space task the kernel created. | |
e69f6186 YB |
1548 | * |
1549 | * Return: 1 if the task structure is init. 0 otherwise. | |
b460cbc5 | 1550 | */ |
e868171a | 1551 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 | 1552 | { |
570f5241 | 1553 | return task_tgid_nr(tsk) == 1; |
b461cc03 | 1554 | } |
b460cbc5 | 1555 | |
9ec52099 CLG |
1556 | extern struct pid *cad_pid; |
1557 | ||
1da177e4 | 1558 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1559 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1560 | |
158d9ebd | 1561 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1562 | |
1563 | static inline void put_task_struct(struct task_struct *t) | |
1564 | { | |
1565 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1566 | __put_task_struct(t); |
e56d0903 | 1567 | } |
1da177e4 | 1568 | |
150593bf ON |
1569 | struct task_struct *task_rcu_dereference(struct task_struct **ptask); |
1570 | struct task_struct *try_get_task_struct(struct task_struct **ptask); | |
1571 | ||
6a61671b FW |
1572 | #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN |
1573 | extern void task_cputime(struct task_struct *t, | |
5613fda9 | 1574 | u64 *utime, u64 *stime); |
16a6d9be | 1575 | extern u64 task_gtime(struct task_struct *t); |
6a61671b | 1576 | #else |
6fac4829 | 1577 | static inline void task_cputime(struct task_struct *t, |
5613fda9 | 1578 | u64 *utime, u64 *stime) |
6fac4829 | 1579 | { |
353c50eb SG |
1580 | *utime = t->utime; |
1581 | *stime = t->stime; | |
6fac4829 FW |
1582 | } |
1583 | ||
16a6d9be | 1584 | static inline u64 task_gtime(struct task_struct *t) |
40565b5a SG |
1585 | { |
1586 | return t->gtime; | |
1587 | } | |
1588 | #endif | |
1589 | ||
1590 | #ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME | |
6fac4829 | 1591 | static inline void task_cputime_scaled(struct task_struct *t, |
5613fda9 FW |
1592 | u64 *utimescaled, |
1593 | u64 *stimescaled) | |
6fac4829 | 1594 | { |
353c50eb SG |
1595 | *utimescaled = t->utimescaled; |
1596 | *stimescaled = t->stimescaled; | |
6fac4829 | 1597 | } |
40565b5a SG |
1598 | #else |
1599 | static inline void task_cputime_scaled(struct task_struct *t, | |
5613fda9 FW |
1600 | u64 *utimescaled, |
1601 | u64 *stimescaled) | |
6a61671b | 1602 | { |
40565b5a | 1603 | task_cputime(t, utimescaled, stimescaled); |
6a61671b FW |
1604 | } |
1605 | #endif | |
40565b5a | 1606 | |
5613fda9 FW |
1607 | extern void task_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st); |
1608 | extern void thread_group_cputime_adjusted(struct task_struct *p, u64 *ut, u64 *st); | |
49048622 | 1609 | |
1da177e4 LT |
1610 | /* |
1611 | * Per process flags | |
1612 | */ | |
c1de45ca | 1613 | #define PF_IDLE 0x00000002 /* I am an IDLE thread */ |
1da177e4 | 1614 | #define PF_EXITING 0x00000004 /* getting shut down */ |
778e9a9c | 1615 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1616 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1617 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1618 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1619 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1620 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1621 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1622 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1623 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
72fa5997 | 1624 | #define PF_NPROC_EXCEEDED 0x00001000 /* set_user noticed that RLIMIT_NPROC was exceeded */ |
1da177e4 | 1625 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
774a1221 | 1626 | #define PF_USED_ASYNC 0x00004000 /* used async_schedule*(), used by module init */ |
1da177e4 LT |
1627 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1628 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1629 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1630 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
21caf2fc | 1631 | #define PF_MEMALLOC_NOIO 0x00080000 /* Allocating memory without IO involved */ |
1da177e4 | 1632 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1633 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1634 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1635 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
14a40ffc | 1636 | #define PF_NO_SETAFFINITY 0x04000000 /* Userland is not allowed to meddle with cpus_allowed */ |
4db96cf0 | 1637 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
61a87122 | 1638 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1639 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
2b44c4db | 1640 | #define PF_SUSPEND_TASK 0x80000000 /* this thread called freeze_processes and should not be frozen */ |
1da177e4 LT |
1641 | |
1642 | /* | |
1643 | * Only the _current_ task can read/write to tsk->flags, but other | |
1644 | * tasks can access tsk->flags in readonly mode for example | |
1645 | * with tsk_used_math (like during threaded core dumping). | |
1646 | * There is however an exception to this rule during ptrace | |
1647 | * or during fork: the ptracer task is allowed to write to the | |
1648 | * child->flags of its traced child (same goes for fork, the parent | |
1649 | * can write to the child->flags), because we're guaranteed the | |
1650 | * child is not running and in turn not changing child->flags | |
1651 | * at the same time the parent does it. | |
1652 | */ | |
1653 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1654 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1655 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1656 | #define set_used_math() set_stopped_child_used_math(current) | |
1657 | #define conditional_stopped_child_used_math(condition, child) \ | |
1658 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1659 | #define conditional_used_math(condition) \ | |
1660 | conditional_stopped_child_used_math(condition, current) | |
1661 | #define copy_to_stopped_child_used_math(child) \ | |
1662 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1663 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1664 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1665 | #define used_math() tsk_used_math(current) | |
1666 | ||
934f3072 JB |
1667 | /* __GFP_IO isn't allowed if PF_MEMALLOC_NOIO is set in current->flags |
1668 | * __GFP_FS is also cleared as it implies __GFP_IO. | |
1669 | */ | |
21caf2fc ML |
1670 | static inline gfp_t memalloc_noio_flags(gfp_t flags) |
1671 | { | |
1672 | if (unlikely(current->flags & PF_MEMALLOC_NOIO)) | |
934f3072 | 1673 | flags &= ~(__GFP_IO | __GFP_FS); |
21caf2fc ML |
1674 | return flags; |
1675 | } | |
1676 | ||
1677 | static inline unsigned int memalloc_noio_save(void) | |
1678 | { | |
1679 | unsigned int flags = current->flags & PF_MEMALLOC_NOIO; | |
1680 | current->flags |= PF_MEMALLOC_NOIO; | |
1681 | return flags; | |
1682 | } | |
1683 | ||
1684 | static inline void memalloc_noio_restore(unsigned int flags) | |
1685 | { | |
1686 | current->flags = (current->flags & ~PF_MEMALLOC_NOIO) | flags; | |
1687 | } | |
1688 | ||
1d4457f9 | 1689 | /* Per-process atomic flags. */ |
a2b86f77 | 1690 | #define PFA_NO_NEW_PRIVS 0 /* May not gain new privileges. */ |
2ad654bc ZL |
1691 | #define PFA_SPREAD_PAGE 1 /* Spread page cache over cpuset */ |
1692 | #define PFA_SPREAD_SLAB 2 /* Spread some slab caches over cpuset */ | |
77ed2c57 | 1693 | #define PFA_LMK_WAITING 3 /* Lowmemorykiller is waiting */ |
2ad654bc | 1694 | |
1d4457f9 | 1695 | |
e0e5070b ZL |
1696 | #define TASK_PFA_TEST(name, func) \ |
1697 | static inline bool task_##func(struct task_struct *p) \ | |
1698 | { return test_bit(PFA_##name, &p->atomic_flags); } | |
1699 | #define TASK_PFA_SET(name, func) \ | |
1700 | static inline void task_set_##func(struct task_struct *p) \ | |
1701 | { set_bit(PFA_##name, &p->atomic_flags); } | |
1702 | #define TASK_PFA_CLEAR(name, func) \ | |
1703 | static inline void task_clear_##func(struct task_struct *p) \ | |
1704 | { clear_bit(PFA_##name, &p->atomic_flags); } | |
1705 | ||
1706 | TASK_PFA_TEST(NO_NEW_PRIVS, no_new_privs) | |
1707 | TASK_PFA_SET(NO_NEW_PRIVS, no_new_privs) | |
1d4457f9 | 1708 | |
2ad654bc ZL |
1709 | TASK_PFA_TEST(SPREAD_PAGE, spread_page) |
1710 | TASK_PFA_SET(SPREAD_PAGE, spread_page) | |
1711 | TASK_PFA_CLEAR(SPREAD_PAGE, spread_page) | |
1712 | ||
1713 | TASK_PFA_TEST(SPREAD_SLAB, spread_slab) | |
1714 | TASK_PFA_SET(SPREAD_SLAB, spread_slab) | |
1715 | TASK_PFA_CLEAR(SPREAD_SLAB, spread_slab) | |
1d4457f9 | 1716 | |
77ed2c57 TH |
1717 | TASK_PFA_TEST(LMK_WAITING, lmk_waiting) |
1718 | TASK_PFA_SET(LMK_WAITING, lmk_waiting) | |
1719 | ||
e5c1902e | 1720 | /* |
a8f072c1 | 1721 | * task->jobctl flags |
e5c1902e | 1722 | */ |
a8f072c1 | 1723 | #define JOBCTL_STOP_SIGMASK 0xffff /* signr of the last group stop */ |
e5c1902e | 1724 | |
a8f072c1 TH |
1725 | #define JOBCTL_STOP_DEQUEUED_BIT 16 /* stop signal dequeued */ |
1726 | #define JOBCTL_STOP_PENDING_BIT 17 /* task should stop for group stop */ | |
1727 | #define JOBCTL_STOP_CONSUME_BIT 18 /* consume group stop count */ | |
73ddff2b | 1728 | #define JOBCTL_TRAP_STOP_BIT 19 /* trap for STOP */ |
fb1d910c | 1729 | #define JOBCTL_TRAP_NOTIFY_BIT 20 /* trap for NOTIFY */ |
a8f072c1 | 1730 | #define JOBCTL_TRAPPING_BIT 21 /* switching to TRACED */ |
544b2c91 | 1731 | #define JOBCTL_LISTENING_BIT 22 /* ptracer is listening for events */ |
a8f072c1 | 1732 | |
b76808e6 PD |
1733 | #define JOBCTL_STOP_DEQUEUED (1UL << JOBCTL_STOP_DEQUEUED_BIT) |
1734 | #define JOBCTL_STOP_PENDING (1UL << JOBCTL_STOP_PENDING_BIT) | |
1735 | #define JOBCTL_STOP_CONSUME (1UL << JOBCTL_STOP_CONSUME_BIT) | |
1736 | #define JOBCTL_TRAP_STOP (1UL << JOBCTL_TRAP_STOP_BIT) | |
1737 | #define JOBCTL_TRAP_NOTIFY (1UL << JOBCTL_TRAP_NOTIFY_BIT) | |
1738 | #define JOBCTL_TRAPPING (1UL << JOBCTL_TRAPPING_BIT) | |
1739 | #define JOBCTL_LISTENING (1UL << JOBCTL_LISTENING_BIT) | |
a8f072c1 | 1740 | |
fb1d910c | 1741 | #define JOBCTL_TRAP_MASK (JOBCTL_TRAP_STOP | JOBCTL_TRAP_NOTIFY) |
73ddff2b | 1742 | #define JOBCTL_PENDING_MASK (JOBCTL_STOP_PENDING | JOBCTL_TRAP_MASK) |
3759a0d9 | 1743 | |
7dd3db54 | 1744 | extern bool task_set_jobctl_pending(struct task_struct *task, |
b76808e6 | 1745 | unsigned long mask); |
73ddff2b | 1746 | extern void task_clear_jobctl_trapping(struct task_struct *task); |
3759a0d9 | 1747 | extern void task_clear_jobctl_pending(struct task_struct *task, |
b76808e6 | 1748 | unsigned long mask); |
39efa3ef | 1749 | |
f41d911f PM |
1750 | static inline void rcu_copy_process(struct task_struct *p) |
1751 | { | |
8315f422 | 1752 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f | 1753 | p->rcu_read_lock_nesting = 0; |
1d082fd0 | 1754 | p->rcu_read_unlock_special.s = 0; |
dd5d19ba | 1755 | p->rcu_blocked_node = NULL; |
f41d911f | 1756 | INIT_LIST_HEAD(&p->rcu_node_entry); |
8315f422 PM |
1757 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1758 | #ifdef CONFIG_TASKS_RCU | |
1759 | p->rcu_tasks_holdout = false; | |
1760 | INIT_LIST_HEAD(&p->rcu_tasks_holdout_list); | |
176f8f7a | 1761 | p->rcu_tasks_idle_cpu = -1; |
8315f422 | 1762 | #endif /* #ifdef CONFIG_TASKS_RCU */ |
f41d911f PM |
1763 | } |
1764 | ||
907aed48 MG |
1765 | static inline void tsk_restore_flags(struct task_struct *task, |
1766 | unsigned long orig_flags, unsigned long flags) | |
1767 | { | |
1768 | task->flags &= ~flags; | |
1769 | task->flags |= orig_flags & flags; | |
1770 | } | |
1771 | ||
f82f8042 JL |
1772 | extern int cpuset_cpumask_can_shrink(const struct cpumask *cur, |
1773 | const struct cpumask *trial); | |
7f51412a JL |
1774 | extern int task_can_attach(struct task_struct *p, |
1775 | const struct cpumask *cs_cpus_allowed); | |
1da177e4 | 1776 | #ifdef CONFIG_SMP |
1e1b6c51 KM |
1777 | extern void do_set_cpus_allowed(struct task_struct *p, |
1778 | const struct cpumask *new_mask); | |
1779 | ||
cd8ba7cd | 1780 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1781 | const struct cpumask *new_mask); |
1da177e4 | 1782 | #else |
1e1b6c51 KM |
1783 | static inline void do_set_cpus_allowed(struct task_struct *p, |
1784 | const struct cpumask *new_mask) | |
1785 | { | |
1786 | } | |
cd8ba7cd | 1787 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1788 | const struct cpumask *new_mask) |
1da177e4 | 1789 | { |
96f874e2 | 1790 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1791 | return -EINVAL; |
1792 | return 0; | |
1793 | } | |
1794 | #endif | |
e0ad9556 | 1795 | |
3451d024 | 1796 | #ifdef CONFIG_NO_HZ_COMMON |
5167e8d5 PZ |
1797 | void calc_load_enter_idle(void); |
1798 | void calc_load_exit_idle(void); | |
1799 | #else | |
1800 | static inline void calc_load_enter_idle(void) { } | |
1801 | static inline void calc_load_exit_idle(void) { } | |
3451d024 | 1802 | #endif /* CONFIG_NO_HZ_COMMON */ |
5167e8d5 | 1803 | |
6d0d2878 CB |
1804 | #ifndef cpu_relax_yield |
1805 | #define cpu_relax_yield() cpu_relax() | |
1806 | #endif | |
1807 | ||
36c8b586 | 1808 | extern unsigned long long |
41b86e9c | 1809 | task_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1810 | |
1811 | /* sched_exec is called by processes performing an exec */ | |
1812 | #ifdef CONFIG_SMP | |
1813 | extern void sched_exec(void); | |
1814 | #else | |
1815 | #define sched_exec() {} | |
1816 | #endif | |
1817 | ||
1818 | #ifdef CONFIG_HOTPLUG_CPU | |
1819 | extern void idle_task_exit(void); | |
1820 | #else | |
1821 | static inline void idle_task_exit(void) {} | |
1822 | #endif | |
1823 | ||
3451d024 | 1824 | #if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP) |
1c20091e | 1825 | extern void wake_up_nohz_cpu(int cpu); |
06d8308c | 1826 | #else |
1c20091e | 1827 | static inline void wake_up_nohz_cpu(int cpu) { } |
06d8308c TG |
1828 | #endif |
1829 | ||
ce831b38 | 1830 | #ifdef CONFIG_NO_HZ_FULL |
265f22a9 | 1831 | extern u64 scheduler_tick_max_deferment(void); |
06d8308c TG |
1832 | #endif |
1833 | ||
fa93384f | 1834 | extern int yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1835 | extern void set_user_nice(struct task_struct *p, long nice); |
1836 | extern int task_prio(const struct task_struct *p); | |
d0ea0268 DY |
1837 | /** |
1838 | * task_nice - return the nice value of a given task. | |
1839 | * @p: the task in question. | |
1840 | * | |
1841 | * Return: The nice value [ -20 ... 0 ... 19 ]. | |
1842 | */ | |
1843 | static inline int task_nice(const struct task_struct *p) | |
1844 | { | |
1845 | return PRIO_TO_NICE((p)->static_prio); | |
1846 | } | |
36c8b586 IM |
1847 | extern int can_nice(const struct task_struct *p, const int nice); |
1848 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1849 | extern int idle_cpu(int cpu); |
fe7de49f KM |
1850 | extern int sched_setscheduler(struct task_struct *, int, |
1851 | const struct sched_param *); | |
961ccddd | 1852 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 1853 | const struct sched_param *); |
d50dde5a DF |
1854 | extern int sched_setattr(struct task_struct *, |
1855 | const struct sched_attr *); | |
36c8b586 | 1856 | extern struct task_struct *idle_task(int cpu); |
c4f30608 PM |
1857 | /** |
1858 | * is_idle_task - is the specified task an idle task? | |
fa757281 | 1859 | * @p: the task in question. |
e69f6186 YB |
1860 | * |
1861 | * Return: 1 if @p is an idle task. 0 otherwise. | |
c4f30608 | 1862 | */ |
7061ca3b | 1863 | static inline bool is_idle_task(const struct task_struct *p) |
c4f30608 | 1864 | { |
c1de45ca | 1865 | return !!(p->flags & PF_IDLE); |
c4f30608 | 1866 | } |
36c8b586 | 1867 | extern struct task_struct *curr_task(int cpu); |
a458ae2e | 1868 | extern void ia64_set_curr_task(int cpu, struct task_struct *p); |
1da177e4 LT |
1869 | |
1870 | void yield(void); | |
1871 | ||
1da177e4 | 1872 | union thread_union { |
c65eacbe | 1873 | #ifndef CONFIG_THREAD_INFO_IN_TASK |
1da177e4 | 1874 | struct thread_info thread_info; |
c65eacbe | 1875 | #endif |
1da177e4 LT |
1876 | unsigned long stack[THREAD_SIZE/sizeof(long)]; |
1877 | }; | |
1878 | ||
1879 | #ifndef __HAVE_ARCH_KSTACK_END | |
1880 | static inline int kstack_end(void *addr) | |
1881 | { | |
1882 | /* Reliable end of stack detection: | |
1883 | * Some APM bios versions misalign the stack | |
1884 | */ | |
1885 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
1886 | } | |
1887 | #endif | |
1888 | ||
1889 | extern union thread_union init_thread_union; | |
1890 | extern struct task_struct init_task; | |
1891 | ||
1892 | extern struct mm_struct init_mm; | |
1893 | ||
198fe21b PE |
1894 | extern struct pid_namespace init_pid_ns; |
1895 | ||
1896 | /* | |
1897 | * find a task by one of its numerical ids | |
1898 | * | |
198fe21b PE |
1899 | * find_task_by_pid_ns(): |
1900 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
1901 | * find_task_by_vpid(): |
1902 | * finds a task by its virtual pid | |
198fe21b | 1903 | * |
e49859e7 | 1904 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
1905 | */ |
1906 | ||
228ebcbe PE |
1907 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
1908 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
1909 | struct pid_namespace *ns); | |
198fe21b | 1910 | |
1da177e4 | 1911 | /* per-UID process charging. */ |
7b44ab97 | 1912 | extern struct user_struct * alloc_uid(kuid_t); |
1da177e4 LT |
1913 | static inline struct user_struct *get_uid(struct user_struct *u) |
1914 | { | |
1915 | atomic_inc(&u->__count); | |
1916 | return u; | |
1917 | } | |
1918 | extern void free_uid(struct user_struct *); | |
1da177e4 LT |
1919 | |
1920 | #include <asm/current.h> | |
1921 | ||
f0af911a | 1922 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 1923 | |
b3c97528 HH |
1924 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
1925 | extern int wake_up_process(struct task_struct *tsk); | |
3e51e3ed | 1926 | extern void wake_up_new_task(struct task_struct *tsk); |
1da177e4 LT |
1927 | #ifdef CONFIG_SMP |
1928 | extern void kick_process(struct task_struct *tsk); | |
1929 | #else | |
1930 | static inline void kick_process(struct task_struct *tsk) { } | |
1931 | #endif | |
aab03e05 | 1932 | extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
ad46c2c4 | 1933 | extern void sched_dead(struct task_struct *p); |
1da177e4 | 1934 | |
1da177e4 | 1935 | extern void proc_caches_init(void); |
9a13049e | 1936 | |
1da177e4 | 1937 | extern void release_task(struct task_struct * p); |
5a1b98d3 | 1938 | |
3033f14a JT |
1939 | #ifdef CONFIG_HAVE_COPY_THREAD_TLS |
1940 | extern int copy_thread_tls(unsigned long, unsigned long, unsigned long, | |
1941 | struct task_struct *, unsigned long); | |
1942 | #else | |
6f2c55b8 | 1943 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
afa86fc4 | 1944 | struct task_struct *); |
3033f14a JT |
1945 | |
1946 | /* Architectures that haven't opted into copy_thread_tls get the tls argument | |
1947 | * via pt_regs, so ignore the tls argument passed via C. */ | |
1948 | static inline int copy_thread_tls( | |
1949 | unsigned long clone_flags, unsigned long sp, unsigned long arg, | |
1950 | struct task_struct *p, unsigned long tls) | |
1951 | { | |
1952 | return copy_thread(clone_flags, sp, arg, p); | |
1953 | } | |
1954 | #endif | |
1da177e4 | 1955 | extern void flush_thread(void); |
5f56a5df JS |
1956 | |
1957 | #ifdef CONFIG_HAVE_EXIT_THREAD | |
e6464694 | 1958 | extern void exit_thread(struct task_struct *tsk); |
5f56a5df | 1959 | #else |
e6464694 | 1960 | static inline void exit_thread(struct task_struct *tsk) |
5f56a5df JS |
1961 | { |
1962 | } | |
1963 | #endif | |
1da177e4 | 1964 | |
1da177e4 | 1965 | extern void exit_files(struct task_struct *); |
cbaffba1 | 1966 | |
1da177e4 LT |
1967 | extern void exit_itimers(struct signal_struct *); |
1968 | ||
9402c95f | 1969 | extern void do_group_exit(int); |
1da177e4 | 1970 | |
c4ad8f98 | 1971 | extern int do_execve(struct filename *, |
d7627467 | 1972 | const char __user * const __user *, |
da3d4c5f | 1973 | const char __user * const __user *); |
51f39a1f DD |
1974 | extern int do_execveat(int, struct filename *, |
1975 | const char __user * const __user *, | |
1976 | const char __user * const __user *, | |
1977 | int); | |
3033f14a | 1978 | extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long); |
e80d6661 | 1979 | extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *); |
36c8b586 | 1980 | struct task_struct *fork_idle(int); |
2aa3a7f8 | 1981 | extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
1da177e4 | 1982 | |
82b89778 AH |
1983 | extern void __set_task_comm(struct task_struct *tsk, const char *from, bool exec); |
1984 | static inline void set_task_comm(struct task_struct *tsk, const char *from) | |
1985 | { | |
1986 | __set_task_comm(tsk, from, false); | |
1987 | } | |
59714d65 | 1988 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
1989 | |
1990 | #ifdef CONFIG_SMP | |
317f3941 | 1991 | void scheduler_ipi(void); |
85ba2d86 | 1992 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 1993 | #else |
184748cc | 1994 | static inline void scheduler_ipi(void) { } |
85ba2d86 RM |
1995 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
1996 | long match_state) | |
1997 | { | |
1998 | return 1; | |
1999 | } | |
1da177e4 LT |
2000 | #endif |
2001 | ||
1da177e4 | 2002 | /* |
260ea101 | 2003 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2004 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 | 2005 | * pins the final release of task.io_context. Also protects ->cpuset and |
d68b46fe | 2006 | * ->cgroup.subsys[]. And ->vfork_done. |
1da177e4 LT |
2007 | * |
2008 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2009 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2010 | * neither inside nor outside. | |
2011 | */ | |
2012 | static inline void task_lock(struct task_struct *p) | |
2013 | { | |
2014 | spin_lock(&p->alloc_lock); | |
2015 | } | |
2016 | ||
2017 | static inline void task_unlock(struct task_struct *p) | |
2018 | { | |
2019 | spin_unlock(&p->alloc_lock); | |
2020 | } | |
2021 | ||
c65eacbe AL |
2022 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
2023 | ||
2024 | static inline struct thread_info *task_thread_info(struct task_struct *task) | |
2025 | { | |
2026 | return &task->thread_info; | |
2027 | } | |
c6c314a6 AL |
2028 | |
2029 | /* | |
2030 | * When accessing the stack of a non-current task that might exit, use | |
2031 | * try_get_task_stack() instead. task_stack_page will return a pointer | |
2032 | * that could get freed out from under you. | |
2033 | */ | |
c65eacbe AL |
2034 | static inline void *task_stack_page(const struct task_struct *task) |
2035 | { | |
2036 | return task->stack; | |
2037 | } | |
c6c314a6 | 2038 | |
c65eacbe | 2039 | #define setup_thread_stack(new,old) do { } while(0) |
c6c314a6 | 2040 | |
c65eacbe AL |
2041 | static inline unsigned long *end_of_stack(const struct task_struct *task) |
2042 | { | |
2043 | return task->stack; | |
2044 | } | |
2045 | ||
2046 | #elif !defined(__HAVE_THREAD_FUNCTIONS) | |
f037360f | 2047 | |
f7e4217b | 2048 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
c65eacbe | 2049 | #define task_stack_page(task) ((void *)(task)->stack) |
a1261f54 | 2050 | |
10ebffde AV |
2051 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2052 | { | |
2053 | *task_thread_info(p) = *task_thread_info(org); | |
2054 | task_thread_info(p)->task = p; | |
2055 | } | |
2056 | ||
6a40281a CE |
2057 | /* |
2058 | * Return the address of the last usable long on the stack. | |
2059 | * | |
2060 | * When the stack grows down, this is just above the thread | |
2061 | * info struct. Going any lower will corrupt the threadinfo. | |
2062 | * | |
2063 | * When the stack grows up, this is the highest address. | |
2064 | * Beyond that position, we corrupt data on the next page. | |
2065 | */ | |
10ebffde AV |
2066 | static inline unsigned long *end_of_stack(struct task_struct *p) |
2067 | { | |
6a40281a CE |
2068 | #ifdef CONFIG_STACK_GROWSUP |
2069 | return (unsigned long *)((unsigned long)task_thread_info(p) + THREAD_SIZE) - 1; | |
2070 | #else | |
f7e4217b | 2071 | return (unsigned long *)(task_thread_info(p) + 1); |
6a40281a | 2072 | #endif |
10ebffde AV |
2073 | } |
2074 | ||
f037360f | 2075 | #endif |
c6c314a6 | 2076 | |
68f24b08 AL |
2077 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
2078 | static inline void *try_get_task_stack(struct task_struct *tsk) | |
2079 | { | |
2080 | return atomic_inc_not_zero(&tsk->stack_refcount) ? | |
2081 | task_stack_page(tsk) : NULL; | |
2082 | } | |
2083 | ||
2084 | extern void put_task_stack(struct task_struct *tsk); | |
2085 | #else | |
c6c314a6 AL |
2086 | static inline void *try_get_task_stack(struct task_struct *tsk) |
2087 | { | |
2088 | return task_stack_page(tsk); | |
2089 | } | |
2090 | ||
2091 | static inline void put_task_stack(struct task_struct *tsk) {} | |
68f24b08 | 2092 | #endif |
c6c314a6 | 2093 | |
a70857e4 AT |
2094 | #define task_stack_end_corrupted(task) \ |
2095 | (*(end_of_stack(task)) != STACK_END_MAGIC) | |
f037360f | 2096 | |
8b05c7e6 FT |
2097 | static inline int object_is_on_stack(void *obj) |
2098 | { | |
2099 | void *stack = task_stack_page(current); | |
2100 | ||
2101 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2102 | } | |
2103 | ||
b235beea | 2104 | extern void thread_stack_cache_init(void); |
8c9843e5 | 2105 | |
7c9f8861 ES |
2106 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2107 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2108 | { | |
2109 | unsigned long *n = end_of_stack(p); | |
2110 | ||
2111 | do { /* Skip over canary */ | |
6c31da34 HD |
2112 | # ifdef CONFIG_STACK_GROWSUP |
2113 | n--; | |
2114 | # else | |
7c9f8861 | 2115 | n++; |
6c31da34 | 2116 | # endif |
7c9f8861 ES |
2117 | } while (!*n); |
2118 | ||
6c31da34 HD |
2119 | # ifdef CONFIG_STACK_GROWSUP |
2120 | return (unsigned long)end_of_stack(p) - (unsigned long)n; | |
2121 | # else | |
7c9f8861 | 2122 | return (unsigned long)n - (unsigned long)end_of_stack(p); |
6c31da34 | 2123 | # endif |
7c9f8861 ES |
2124 | } |
2125 | #endif | |
d4311ff1 | 2126 | extern void set_task_stack_end_magic(struct task_struct *tsk); |
7c9f8861 | 2127 | |
1da177e4 LT |
2128 | /* set thread flags in other task's structures |
2129 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2130 | */ | |
2131 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2132 | { | |
a1261f54 | 2133 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2134 | } |
2135 | ||
2136 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2137 | { | |
a1261f54 | 2138 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2139 | } |
2140 | ||
2141 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2142 | { | |
a1261f54 | 2143 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2144 | } |
2145 | ||
2146 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2147 | { | |
a1261f54 | 2148 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2149 | } |
2150 | ||
2151 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2152 | { | |
a1261f54 | 2153 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2154 | } |
2155 | ||
2156 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2157 | { | |
2158 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2159 | } | |
2160 | ||
2161 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2162 | { | |
2163 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2164 | } | |
2165 | ||
8ae121ac GH |
2166 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2167 | { | |
2168 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2169 | } | |
2170 | ||
690cc3ff EB |
2171 | static inline int restart_syscall(void) |
2172 | { | |
2173 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2174 | return -ERESTARTNOINTR; | |
2175 | } | |
2176 | ||
1da177e4 LT |
2177 | static inline int signal_pending(struct task_struct *p) |
2178 | { | |
2179 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2180 | } | |
f776d12d | 2181 | |
d9588725 RM |
2182 | static inline int __fatal_signal_pending(struct task_struct *p) |
2183 | { | |
2184 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2185 | } | |
f776d12d MW |
2186 | |
2187 | static inline int fatal_signal_pending(struct task_struct *p) | |
2188 | { | |
2189 | return signal_pending(p) && __fatal_signal_pending(p); | |
2190 | } | |
2191 | ||
16882c1e ON |
2192 | static inline int signal_pending_state(long state, struct task_struct *p) |
2193 | { | |
2194 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2195 | return 0; | |
2196 | if (!signal_pending(p)) | |
2197 | return 0; | |
2198 | ||
16882c1e ON |
2199 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2200 | } | |
2201 | ||
1da177e4 LT |
2202 | /* |
2203 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2204 | * explicit rescheduling in places that are safe. The return | |
2205 | * value indicates whether a reschedule was done in fact. | |
2206 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2207 | * cond_resched_softirq() will enable bhs before scheduling. | |
2208 | */ | |
35a773a0 | 2209 | #ifndef CONFIG_PREEMPT |
c3921ab7 | 2210 | extern int _cond_resched(void); |
35a773a0 PZ |
2211 | #else |
2212 | static inline int _cond_resched(void) { return 0; } | |
2213 | #endif | |
6f80bd98 | 2214 | |
613afbf8 | 2215 | #define cond_resched() ({ \ |
3427445a | 2216 | ___might_sleep(__FILE__, __LINE__, 0); \ |
613afbf8 FW |
2217 | _cond_resched(); \ |
2218 | }) | |
6f80bd98 | 2219 | |
613afbf8 FW |
2220 | extern int __cond_resched_lock(spinlock_t *lock); |
2221 | ||
2222 | #define cond_resched_lock(lock) ({ \ | |
3427445a | 2223 | ___might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET);\ |
613afbf8 FW |
2224 | __cond_resched_lock(lock); \ |
2225 | }) | |
2226 | ||
2227 | extern int __cond_resched_softirq(void); | |
2228 | ||
75e1056f | 2229 | #define cond_resched_softirq() ({ \ |
3427445a | 2230 | ___might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ |
75e1056f | 2231 | __cond_resched_softirq(); \ |
613afbf8 | 2232 | }) |
1da177e4 | 2233 | |
f6f3c437 SH |
2234 | static inline void cond_resched_rcu(void) |
2235 | { | |
2236 | #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) | |
2237 | rcu_read_unlock(); | |
2238 | cond_resched(); | |
2239 | rcu_read_lock(); | |
2240 | #endif | |
2241 | } | |
2242 | ||
1da177e4 LT |
2243 | /* |
2244 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2245 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2246 | * but a general need for low latency) | |
1da177e4 | 2247 | */ |
95c354fe | 2248 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2249 | { |
95c354fe NP |
2250 | #ifdef CONFIG_PREEMPT |
2251 | return spin_is_contended(lock); | |
2252 | #else | |
1da177e4 | 2253 | return 0; |
95c354fe | 2254 | #endif |
1da177e4 LT |
2255 | } |
2256 | ||
75f93fed PZ |
2257 | static __always_inline bool need_resched(void) |
2258 | { | |
2259 | return unlikely(tif_need_resched()); | |
2260 | } | |
2261 | ||
f06febc9 FM |
2262 | /* |
2263 | * Thread group CPU time accounting. | |
2264 | */ | |
4cd4c1b4 | 2265 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2266 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2267 | |
7bb44ade RM |
2268 | /* |
2269 | * Reevaluate whether the task has signals pending delivery. | |
2270 | * Wake the task if so. | |
2271 | * This is required every time the blocked sigset_t changes. | |
2272 | * callers must hold sighand->siglock. | |
2273 | */ | |
2274 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2275 | extern void recalc_sigpending(void); |
2276 | ||
910ffdb1 ON |
2277 | extern void signal_wake_up_state(struct task_struct *t, unsigned int state); |
2278 | ||
2279 | static inline void signal_wake_up(struct task_struct *t, bool resume) | |
2280 | { | |
2281 | signal_wake_up_state(t, resume ? TASK_WAKEKILL : 0); | |
2282 | } | |
2283 | static inline void ptrace_signal_wake_up(struct task_struct *t, bool resume) | |
2284 | { | |
2285 | signal_wake_up_state(t, resume ? __TASK_TRACED : 0); | |
2286 | } | |
1da177e4 LT |
2287 | |
2288 | /* | |
2289 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2290 | */ | |
2291 | #ifdef CONFIG_SMP | |
2292 | ||
2293 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2294 | { | |
c65eacbe AL |
2295 | #ifdef CONFIG_THREAD_INFO_IN_TASK |
2296 | return p->cpu; | |
2297 | #else | |
a1261f54 | 2298 | return task_thread_info(p)->cpu; |
c65eacbe | 2299 | #endif |
1da177e4 LT |
2300 | } |
2301 | ||
b32e86b4 IM |
2302 | static inline int task_node(const struct task_struct *p) |
2303 | { | |
2304 | return cpu_to_node(task_cpu(p)); | |
2305 | } | |
2306 | ||
c65cc870 | 2307 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2308 | |
2309 | #else | |
2310 | ||
2311 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2312 | { | |
2313 | return 0; | |
2314 | } | |
2315 | ||
2316 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2317 | { | |
2318 | } | |
2319 | ||
2320 | #endif /* CONFIG_SMP */ | |
2321 | ||
d9345c65 PX |
2322 | /* |
2323 | * In order to reduce various lock holder preemption latencies provide an | |
2324 | * interface to see if a vCPU is currently running or not. | |
2325 | * | |
2326 | * This allows us to terminate optimistic spin loops and block, analogous to | |
2327 | * the native optimistic spin heuristic of testing if the lock owner task is | |
2328 | * running or not. | |
2329 | */ | |
2330 | #ifndef vcpu_is_preempted | |
2331 | # define vcpu_is_preempted(cpu) false | |
2332 | #endif | |
2333 | ||
96f874e2 RR |
2334 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2335 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2336 | |
7c941438 | 2337 | #ifdef CONFIG_CGROUP_SCHED |
07e06b01 | 2338 | extern struct task_group root_task_group; |
8323f26c | 2339 | #endif /* CONFIG_CGROUP_SCHED */ |
9b5b7751 | 2340 | |
54e99124 DG |
2341 | extern int task_can_switch_user(struct user_struct *up, |
2342 | struct task_struct *tsk); | |
2343 | ||
4b98d11b AD |
2344 | #ifdef CONFIG_TASK_XACCT |
2345 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2346 | { | |
940389b8 | 2347 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2348 | } |
2349 | ||
2350 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2351 | { | |
940389b8 | 2352 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2353 | } |
2354 | ||
2355 | static inline void inc_syscr(struct task_struct *tsk) | |
2356 | { | |
940389b8 | 2357 | tsk->ioac.syscr++; |
4b98d11b AD |
2358 | } |
2359 | ||
2360 | static inline void inc_syscw(struct task_struct *tsk) | |
2361 | { | |
940389b8 | 2362 | tsk->ioac.syscw++; |
4b98d11b AD |
2363 | } |
2364 | #else | |
2365 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2366 | { | |
2367 | } | |
2368 | ||
2369 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2370 | { | |
2371 | } | |
2372 | ||
2373 | static inline void inc_syscr(struct task_struct *tsk) | |
2374 | { | |
2375 | } | |
2376 | ||
2377 | static inline void inc_syscw(struct task_struct *tsk) | |
2378 | { | |
2379 | } | |
2380 | #endif | |
2381 | ||
82455257 DH |
2382 | #ifndef TASK_SIZE_OF |
2383 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2384 | #endif | |
2385 | ||
f98bafa0 | 2386 | #ifdef CONFIG_MEMCG |
cf475ad2 | 2387 | extern void mm_update_next_owner(struct mm_struct *mm); |
cf475ad2 BS |
2388 | #else |
2389 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2390 | { | |
2391 | } | |
f98bafa0 | 2392 | #endif /* CONFIG_MEMCG */ |
cf475ad2 | 2393 | |
58919e83 RW |
2394 | #define SCHED_CPUFREQ_RT (1U << 0) |
2395 | #define SCHED_CPUFREQ_DL (1U << 1) | |
8c34ab19 | 2396 | #define SCHED_CPUFREQ_IOWAIT (1U << 2) |
58919e83 RW |
2397 | |
2398 | #define SCHED_CPUFREQ_RT_DL (SCHED_CPUFREQ_RT | SCHED_CPUFREQ_DL) | |
2399 | ||
adaf9fcd RW |
2400 | #ifdef CONFIG_CPU_FREQ |
2401 | struct update_util_data { | |
58919e83 | 2402 | void (*func)(struct update_util_data *data, u64 time, unsigned int flags); |
adaf9fcd RW |
2403 | }; |
2404 | ||
0bed612b | 2405 | void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data, |
58919e83 RW |
2406 | void (*func)(struct update_util_data *data, u64 time, |
2407 | unsigned int flags)); | |
0bed612b | 2408 | void cpufreq_remove_update_util_hook(int cpu); |
adaf9fcd RW |
2409 | #endif /* CONFIG_CPU_FREQ */ |
2410 | ||
1da177e4 | 2411 | #endif |