Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/mm.h> |
615d6e87 | 2 | #include <linux/vmacache.h> |
1da177e4 | 3 | #include <linux/hugetlb.h> |
22e057c5 | 4 | #include <linux/huge_mm.h> |
1da177e4 LT |
5 | #include <linux/mount.h> |
6 | #include <linux/seq_file.h> | |
e070ad49 | 7 | #include <linux/highmem.h> |
5096add8 | 8 | #include <linux/ptrace.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
6e21c8f1 CL |
10 | #include <linux/pagemap.h> |
11 | #include <linux/mempolicy.h> | |
22e057c5 | 12 | #include <linux/rmap.h> |
85863e47 MM |
13 | #include <linux/swap.h> |
14 | #include <linux/swapops.h> | |
0f8975ec | 15 | #include <linux/mmu_notifier.h> |
33c3fc71 | 16 | #include <linux/page_idle.h> |
6a15a370 | 17 | #include <linux/shmem_fs.h> |
e070ad49 | 18 | |
1da177e4 LT |
19 | #include <asm/elf.h> |
20 | #include <asm/uaccess.h> | |
e070ad49 | 21 | #include <asm/tlbflush.h> |
1da177e4 LT |
22 | #include "internal.h" |
23 | ||
df5f8314 | 24 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 25 | { |
84638335 | 26 | unsigned long text, lib, swap, ptes, pmds, anon, file, shmem; |
365e9c87 HD |
27 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
28 | ||
8cee852e JM |
29 | anon = get_mm_counter(mm, MM_ANONPAGES); |
30 | file = get_mm_counter(mm, MM_FILEPAGES); | |
31 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
32 | ||
365e9c87 HD |
33 | /* |
34 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
35 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
36 | * collector of these hiwater stats must therefore get total_vm | |
37 | * and rss too, which will usually be the higher. Barriers? not | |
38 | * worth the effort, such snapshots can always be inconsistent. | |
39 | */ | |
40 | hiwater_vm = total_vm = mm->total_vm; | |
41 | if (hiwater_vm < mm->hiwater_vm) | |
42 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 43 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
44 | if (hiwater_rss < mm->hiwater_rss) |
45 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 46 | |
1da177e4 LT |
47 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; |
48 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 49 | swap = get_mm_counter(mm, MM_SWAPENTS); |
dc6c9a35 KS |
50 | ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); |
51 | pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); | |
df5f8314 | 52 | seq_printf(m, |
365e9c87 | 53 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
54 | "VmSize:\t%8lu kB\n" |
55 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 56 | "VmPin:\t%8lu kB\n" |
365e9c87 | 57 | "VmHWM:\t%8lu kB\n" |
1da177e4 | 58 | "VmRSS:\t%8lu kB\n" |
8cee852e JM |
59 | "RssAnon:\t%8lu kB\n" |
60 | "RssFile:\t%8lu kB\n" | |
61 | "RssShmem:\t%8lu kB\n" | |
1da177e4 LT |
62 | "VmData:\t%8lu kB\n" |
63 | "VmStk:\t%8lu kB\n" | |
64 | "VmExe:\t%8lu kB\n" | |
65 | "VmLib:\t%8lu kB\n" | |
b084d435 | 66 | "VmPTE:\t%8lu kB\n" |
dc6c9a35 | 67 | "VmPMD:\t%8lu kB\n" |
b084d435 | 68 | "VmSwap:\t%8lu kB\n", |
365e9c87 | 69 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 70 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 71 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 72 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
73 | hiwater_rss << (PAGE_SHIFT-10), |
74 | total_rss << (PAGE_SHIFT-10), | |
8cee852e JM |
75 | anon << (PAGE_SHIFT-10), |
76 | file << (PAGE_SHIFT-10), | |
77 | shmem << (PAGE_SHIFT-10), | |
84638335 | 78 | mm->data_vm << (PAGE_SHIFT-10), |
1da177e4 | 79 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, |
dc6c9a35 KS |
80 | ptes >> 10, |
81 | pmds >> 10, | |
b084d435 | 82 | swap << (PAGE_SHIFT-10)); |
5d317b2b | 83 | hugetlb_report_usage(m, mm); |
1da177e4 LT |
84 | } |
85 | ||
86 | unsigned long task_vsize(struct mm_struct *mm) | |
87 | { | |
88 | return PAGE_SIZE * mm->total_vm; | |
89 | } | |
90 | ||
a2ade7b6 AD |
91 | unsigned long task_statm(struct mm_struct *mm, |
92 | unsigned long *shared, unsigned long *text, | |
93 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 94 | { |
eca56ff9 JM |
95 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
96 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
97 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
98 | >> PAGE_SHIFT; | |
84638335 | 99 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 100 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
101 | return mm->total_vm; |
102 | } | |
103 | ||
9e781440 KH |
104 | #ifdef CONFIG_NUMA |
105 | /* | |
498f2371 | 106 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
107 | */ |
108 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
109 | { | |
110 | struct task_struct *task = priv->task; | |
111 | ||
112 | task_lock(task); | |
498f2371 | 113 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
114 | mpol_get(priv->task_mempolicy); |
115 | task_unlock(task); | |
116 | } | |
117 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
118 | { | |
119 | mpol_put(priv->task_mempolicy); | |
120 | } | |
121 | #else | |
122 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
123 | { | |
124 | } | |
125 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
126 | { | |
127 | } | |
128 | #endif | |
129 | ||
59b4bf12 | 130 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 131 | { |
59b4bf12 ON |
132 | struct mm_struct *mm = priv->mm; |
133 | ||
134 | release_task_mempolicy(priv); | |
135 | up_read(&mm->mmap_sem); | |
136 | mmput(mm); | |
a6198797 | 137 | } |
ec4dd3eb | 138 | |
ad2a00e4 ON |
139 | static struct vm_area_struct * |
140 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
141 | { | |
142 | if (vma == priv->tail_vma) | |
143 | return NULL; | |
144 | return vma->vm_next ?: priv->tail_vma; | |
145 | } | |
146 | ||
b8c20a9b ON |
147 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
148 | { | |
149 | if (m->count < m->size) /* vma is copied successfully */ | |
150 | m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL; | |
151 | } | |
152 | ||
0c255321 | 153 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 154 | { |
a6198797 | 155 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 156 | unsigned long last_addr = m->version; |
a6198797 | 157 | struct mm_struct *mm; |
0c255321 ON |
158 | struct vm_area_struct *vma; |
159 | unsigned int pos = *ppos; | |
a6198797 | 160 | |
b8c20a9b ON |
161 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
162 | if (last_addr == -1UL) | |
163 | return NULL; | |
164 | ||
2c03376d | 165 | priv->task = get_proc_task(priv->inode); |
a6198797 | 166 | if (!priv->task) |
ec6fd8a4 | 167 | return ERR_PTR(-ESRCH); |
a6198797 | 168 | |
29a40ace ON |
169 | mm = priv->mm; |
170 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) | |
171 | return NULL; | |
a6198797 | 172 | |
0c255321 | 173 | down_read(&mm->mmap_sem); |
9e781440 | 174 | hold_task_mempolicy(priv); |
0c255321 | 175 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 176 | |
b8c20a9b ON |
177 | if (last_addr) { |
178 | vma = find_vma(mm, last_addr); | |
179 | if (vma && (vma = m_next_vma(priv, vma))) | |
180 | return vma; | |
181 | } | |
182 | ||
183 | m->version = 0; | |
0c255321 | 184 | if (pos < mm->map_count) { |
557c2d8a ON |
185 | for (vma = mm->mmap; pos; pos--) { |
186 | m->version = vma->vm_start; | |
a6198797 | 187 | vma = vma->vm_next; |
557c2d8a | 188 | } |
a6198797 | 189 | return vma; |
0c255321 | 190 | } |
a6198797 | 191 | |
557c2d8a | 192 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
193 | if (pos == mm->map_count && priv->tail_vma) |
194 | return priv->tail_vma; | |
59b4bf12 ON |
195 | |
196 | vma_stop(priv); | |
197 | return NULL; | |
a6198797 MM |
198 | } |
199 | ||
200 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
201 | { | |
202 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 203 | struct vm_area_struct *next; |
a6198797 MM |
204 | |
205 | (*pos)++; | |
ad2a00e4 | 206 | next = m_next_vma(priv, v); |
59b4bf12 ON |
207 | if (!next) |
208 | vma_stop(priv); | |
209 | return next; | |
a6198797 MM |
210 | } |
211 | ||
212 | static void m_stop(struct seq_file *m, void *v) | |
213 | { | |
214 | struct proc_maps_private *priv = m->private; | |
a6198797 | 215 | |
59b4bf12 ON |
216 | if (!IS_ERR_OR_NULL(v)) |
217 | vma_stop(priv); | |
0d5f5f45 | 218 | if (priv->task) { |
a6198797 | 219 | put_task_struct(priv->task); |
0d5f5f45 ON |
220 | priv->task = NULL; |
221 | } | |
a6198797 MM |
222 | } |
223 | ||
4db7d0ee ON |
224 | static int proc_maps_open(struct inode *inode, struct file *file, |
225 | const struct seq_operations *ops, int psize) | |
226 | { | |
227 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
228 | ||
229 | if (!priv) | |
230 | return -ENOMEM; | |
231 | ||
2c03376d | 232 | priv->inode = inode; |
29a40ace ON |
233 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
234 | if (IS_ERR(priv->mm)) { | |
235 | int err = PTR_ERR(priv->mm); | |
236 | ||
237 | seq_release_private(inode, file); | |
238 | return err; | |
239 | } | |
240 | ||
4db7d0ee ON |
241 | return 0; |
242 | } | |
243 | ||
29a40ace ON |
244 | static int proc_map_release(struct inode *inode, struct file *file) |
245 | { | |
246 | struct seq_file *seq = file->private_data; | |
247 | struct proc_maps_private *priv = seq->private; | |
248 | ||
249 | if (priv->mm) | |
250 | mmdrop(priv->mm); | |
251 | ||
252 | return seq_release_private(inode, file); | |
253 | } | |
254 | ||
a6198797 | 255 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 256 | const struct seq_operations *ops) |
a6198797 | 257 | { |
4db7d0ee ON |
258 | return proc_maps_open(inode, file, ops, |
259 | sizeof(struct proc_maps_private)); | |
a6198797 | 260 | } |
e070ad49 | 261 | |
65376df5 JW |
262 | /* |
263 | * Indicate if the VMA is a stack for the given task; for | |
264 | * /proc/PID/maps that is the stack of the main task. | |
265 | */ | |
266 | static int is_stack(struct proc_maps_private *priv, | |
267 | struct vm_area_struct *vma, int is_pid) | |
58cb6548 | 268 | { |
65376df5 JW |
269 | int stack = 0; |
270 | ||
271 | if (is_pid) { | |
272 | stack = vma->vm_start <= vma->vm_mm->start_stack && | |
273 | vma->vm_end >= vma->vm_mm->start_stack; | |
274 | } else { | |
275 | struct inode *inode = priv->inode; | |
276 | struct task_struct *task; | |
58cb6548 | 277 | |
65376df5 JW |
278 | rcu_read_lock(); |
279 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
58cb6548 | 280 | if (task) |
65376df5 JW |
281 | stack = vma_is_stack_for_task(vma, task); |
282 | rcu_read_unlock(); | |
58cb6548 | 283 | } |
65376df5 | 284 | return stack; |
58cb6548 ON |
285 | } |
286 | ||
b7643757 SP |
287 | static void |
288 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 289 | { |
e070ad49 ML |
290 | struct mm_struct *mm = vma->vm_mm; |
291 | struct file *file = vma->vm_file; | |
b7643757 | 292 | struct proc_maps_private *priv = m->private; |
ca16d140 | 293 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 294 | unsigned long ino = 0; |
6260a4b0 | 295 | unsigned long long pgoff = 0; |
a09a79f6 | 296 | unsigned long start, end; |
1da177e4 | 297 | dev_t dev = 0; |
b7643757 | 298 | const char *name = NULL; |
1da177e4 LT |
299 | |
300 | if (file) { | |
496ad9aa | 301 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
302 | dev = inode->i_sb->s_dev; |
303 | ino = inode->i_ino; | |
6260a4b0 | 304 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
305 | } |
306 | ||
d7824370 LT |
307 | /* We don't show the stack guard page in /proc/maps */ |
308 | start = vma->vm_start; | |
a09a79f6 MP |
309 | if (stack_guard_page_start(vma, start)) |
310 | start += PAGE_SIZE; | |
311 | end = vma->vm_end; | |
312 | if (stack_guard_page_end(vma, end)) | |
313 | end -= PAGE_SIZE; | |
d7824370 | 314 | |
652586df TH |
315 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
316 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", | |
d7824370 | 317 | start, |
a09a79f6 | 318 | end, |
1da177e4 LT |
319 | flags & VM_READ ? 'r' : '-', |
320 | flags & VM_WRITE ? 'w' : '-', | |
321 | flags & VM_EXEC ? 'x' : '-', | |
322 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 323 | pgoff, |
652586df | 324 | MAJOR(dev), MINOR(dev), ino); |
1da177e4 LT |
325 | |
326 | /* | |
327 | * Print the dentry name for named mappings, and a | |
328 | * special [heap] marker for the heap: | |
329 | */ | |
e070ad49 | 330 | if (file) { |
652586df | 331 | seq_pad(m, ' '); |
2726d566 | 332 | seq_file_path(m, file, "\n"); |
b7643757 SP |
333 | goto done; |
334 | } | |
335 | ||
78d683e8 AL |
336 | if (vma->vm_ops && vma->vm_ops->name) { |
337 | name = vma->vm_ops->name(vma); | |
338 | if (name) | |
339 | goto done; | |
340 | } | |
341 | ||
b7643757 SP |
342 | name = arch_vma_name(vma); |
343 | if (!name) { | |
b7643757 SP |
344 | if (!mm) { |
345 | name = "[vdso]"; | |
346 | goto done; | |
347 | } | |
348 | ||
349 | if (vma->vm_start <= mm->brk && | |
350 | vma->vm_end >= mm->start_brk) { | |
351 | name = "[heap]"; | |
352 | goto done; | |
353 | } | |
354 | ||
65376df5 JW |
355 | if (is_stack(priv, vma, is_pid)) |
356 | name = "[stack]"; | |
b7643757 SP |
357 | } |
358 | ||
359 | done: | |
360 | if (name) { | |
652586df | 361 | seq_pad(m, ' '); |
b7643757 | 362 | seq_puts(m, name); |
1da177e4 LT |
363 | } |
364 | seq_putc(m, '\n'); | |
7c88db0c JK |
365 | } |
366 | ||
b7643757 | 367 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c | 368 | { |
ebb6cdde | 369 | show_map_vma(m, v, is_pid); |
b8c20a9b | 370 | m_cache_vma(m, v); |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
b7643757 SP |
374 | static int show_pid_map(struct seq_file *m, void *v) |
375 | { | |
376 | return show_map(m, v, 1); | |
377 | } | |
378 | ||
379 | static int show_tid_map(struct seq_file *m, void *v) | |
380 | { | |
381 | return show_map(m, v, 0); | |
382 | } | |
383 | ||
03a44825 | 384 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
385 | .start = m_start, |
386 | .next = m_next, | |
387 | .stop = m_stop, | |
b7643757 SP |
388 | .show = show_pid_map |
389 | }; | |
390 | ||
391 | static const struct seq_operations proc_tid_maps_op = { | |
392 | .start = m_start, | |
393 | .next = m_next, | |
394 | .stop = m_stop, | |
395 | .show = show_tid_map | |
a6198797 MM |
396 | }; |
397 | ||
b7643757 | 398 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
399 | { |
400 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
401 | } | |
402 | ||
b7643757 SP |
403 | static int tid_maps_open(struct inode *inode, struct file *file) |
404 | { | |
405 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
406 | } | |
407 | ||
408 | const struct file_operations proc_pid_maps_operations = { | |
409 | .open = pid_maps_open, | |
410 | .read = seq_read, | |
411 | .llseek = seq_lseek, | |
29a40ace | 412 | .release = proc_map_release, |
b7643757 SP |
413 | }; |
414 | ||
415 | const struct file_operations proc_tid_maps_operations = { | |
416 | .open = tid_maps_open, | |
a6198797 MM |
417 | .read = seq_read, |
418 | .llseek = seq_lseek, | |
29a40ace | 419 | .release = proc_map_release, |
a6198797 MM |
420 | }; |
421 | ||
422 | /* | |
423 | * Proportional Set Size(PSS): my share of RSS. | |
424 | * | |
425 | * PSS of a process is the count of pages it has in memory, where each | |
426 | * page is divided by the number of processes sharing it. So if a | |
427 | * process has 1000 pages all to itself, and 1000 shared with one other | |
428 | * process, its PSS will be 1500. | |
429 | * | |
430 | * To keep (accumulated) division errors low, we adopt a 64bit | |
431 | * fixed-point pss counter to minimize division errors. So (pss >> | |
432 | * PSS_SHIFT) would be the real byte count. | |
433 | * | |
434 | * A shift of 12 before division means (assuming 4K page size): | |
435 | * - 1M 3-user-pages add up to 8KB errors; | |
436 | * - supports mapcount up to 2^24, or 16M; | |
437 | * - supports PSS up to 2^52 bytes, or 4PB. | |
438 | */ | |
439 | #define PSS_SHIFT 12 | |
440 | ||
1e883281 | 441 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 442 | struct mem_size_stats { |
a6198797 MM |
443 | unsigned long resident; |
444 | unsigned long shared_clean; | |
445 | unsigned long shared_dirty; | |
446 | unsigned long private_clean; | |
447 | unsigned long private_dirty; | |
448 | unsigned long referenced; | |
b40d4f84 | 449 | unsigned long anonymous; |
4031a219 | 450 | unsigned long anonymous_thp; |
214e471f | 451 | unsigned long swap; |
25ee01a2 NH |
452 | unsigned long shared_hugetlb; |
453 | unsigned long private_hugetlb; | |
a6198797 | 454 | u64 pss; |
8334b962 | 455 | u64 swap_pss; |
c261e7d9 | 456 | bool check_shmem_swap; |
a6198797 MM |
457 | }; |
458 | ||
c164e038 | 459 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
afd9883f | 460 | bool compound, bool young, bool dirty) |
c164e038 | 461 | { |
f4be6153 | 462 | int i, nr = compound ? 1 << compound_order(page) : 1; |
afd9883f | 463 | unsigned long size = nr * PAGE_SIZE; |
c164e038 KS |
464 | |
465 | if (PageAnon(page)) | |
466 | mss->anonymous += size; | |
467 | ||
468 | mss->resident += size; | |
469 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 470 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 471 | mss->referenced += size; |
c164e038 | 472 | |
afd9883f KS |
473 | /* |
474 | * page_count(page) == 1 guarantees the page is mapped exactly once. | |
475 | * If any subpage of the compound page mapped with PTE it would elevate | |
476 | * page_count(). | |
477 | */ | |
478 | if (page_count(page) == 1) { | |
c164e038 KS |
479 | if (dirty || PageDirty(page)) |
480 | mss->private_dirty += size; | |
481 | else | |
482 | mss->private_clean += size; | |
483 | mss->pss += (u64)size << PSS_SHIFT; | |
afd9883f KS |
484 | return; |
485 | } | |
486 | ||
487 | for (i = 0; i < nr; i++, page++) { | |
488 | int mapcount = page_mapcount(page); | |
489 | ||
490 | if (mapcount >= 2) { | |
491 | if (dirty || PageDirty(page)) | |
492 | mss->shared_dirty += PAGE_SIZE; | |
493 | else | |
494 | mss->shared_clean += PAGE_SIZE; | |
495 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; | |
496 | } else { | |
497 | if (dirty || PageDirty(page)) | |
498 | mss->private_dirty += PAGE_SIZE; | |
499 | else | |
500 | mss->private_clean += PAGE_SIZE; | |
501 | mss->pss += PAGE_SIZE << PSS_SHIFT; | |
502 | } | |
c164e038 KS |
503 | } |
504 | } | |
ae11c4d9 | 505 | |
c261e7d9 | 506 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
507 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
508 | struct mm_walk *walk) | |
509 | { | |
510 | struct mem_size_stats *mss = walk->private; | |
511 | ||
48131e03 VB |
512 | mss->swap += shmem_partial_swap_usage( |
513 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
514 | |
515 | return 0; | |
516 | } | |
c261e7d9 VB |
517 | #endif |
518 | ||
c164e038 KS |
519 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
520 | struct mm_walk *walk) | |
ae11c4d9 DH |
521 | { |
522 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 523 | struct vm_area_struct *vma = walk->vma; |
b1d4d9e0 | 524 | struct page *page = NULL; |
ae11c4d9 | 525 | |
c164e038 KS |
526 | if (pte_present(*pte)) { |
527 | page = vm_normal_page(vma, addr, *pte); | |
528 | } else if (is_swap_pte(*pte)) { | |
529 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 530 | |
8334b962 MK |
531 | if (!non_swap_entry(swpent)) { |
532 | int mapcount; | |
533 | ||
c164e038 | 534 | mss->swap += PAGE_SIZE; |
8334b962 MK |
535 | mapcount = swp_swapcount(swpent); |
536 | if (mapcount >= 2) { | |
537 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
538 | ||
539 | do_div(pss_delta, mapcount); | |
540 | mss->swap_pss += pss_delta; | |
541 | } else { | |
542 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
543 | } | |
544 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 545 | page = migration_entry_to_page(swpent); |
c261e7d9 VB |
546 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
547 | && pte_none(*pte))) { | |
48131e03 VB |
548 | page = find_get_entry(vma->vm_file->f_mapping, |
549 | linear_page_index(vma, addr)); | |
550 | if (!page) | |
551 | return; | |
552 | ||
553 | if (radix_tree_exceptional_entry(page)) | |
554 | mss->swap += PAGE_SIZE; | |
555 | else | |
09cbfeaf | 556 | put_page(page); |
48131e03 VB |
557 | |
558 | return; | |
b1d4d9e0 | 559 | } |
ae11c4d9 | 560 | |
ae11c4d9 DH |
561 | if (!page) |
562 | return; | |
afd9883f KS |
563 | |
564 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); | |
ae11c4d9 DH |
565 | } |
566 | ||
c164e038 KS |
567 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
568 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
569 | struct mm_walk *walk) | |
570 | { | |
571 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 572 | struct vm_area_struct *vma = walk->vma; |
c164e038 KS |
573 | struct page *page; |
574 | ||
575 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
576 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
577 | if (IS_ERR_OR_NULL(page)) | |
578 | return; | |
579 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
afd9883f | 580 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
c164e038 KS |
581 | } |
582 | #else | |
583 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
584 | struct mm_walk *walk) | |
585 | { | |
586 | } | |
587 | #endif | |
588 | ||
b3ae5acb | 589 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 590 | struct mm_walk *walk) |
e070ad49 | 591 | { |
14eb6fdd | 592 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 593 | pte_t *pte; |
705e87c0 | 594 | spinlock_t *ptl; |
e070ad49 | 595 | |
b6ec57f4 KS |
596 | ptl = pmd_trans_huge_lock(pmd, vma); |
597 | if (ptl) { | |
c164e038 | 598 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 599 | spin_unlock(ptl); |
025c5b24 | 600 | return 0; |
22e057c5 | 601 | } |
1a5a9906 AA |
602 | |
603 | if (pmd_trans_unstable(pmd)) | |
604 | return 0; | |
22e057c5 DH |
605 | /* |
606 | * The mmap_sem held all the way back in m_start() is what | |
607 | * keeps khugepaged out of here and from collapsing things | |
608 | * in here. | |
609 | */ | |
705e87c0 | 610 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 611 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 612 | smaps_pte_entry(pte, addr, walk); |
705e87c0 HD |
613 | pte_unmap_unlock(pte - 1, ptl); |
614 | cond_resched(); | |
b3ae5acb | 615 | return 0; |
e070ad49 ML |
616 | } |
617 | ||
834f82e2 CG |
618 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
619 | { | |
620 | /* | |
621 | * Don't forget to update Documentation/ on changes. | |
622 | */ | |
623 | static const char mnemonics[BITS_PER_LONG][2] = { | |
624 | /* | |
625 | * In case if we meet a flag we don't know about. | |
626 | */ | |
627 | [0 ... (BITS_PER_LONG-1)] = "??", | |
628 | ||
629 | [ilog2(VM_READ)] = "rd", | |
630 | [ilog2(VM_WRITE)] = "wr", | |
631 | [ilog2(VM_EXEC)] = "ex", | |
632 | [ilog2(VM_SHARED)] = "sh", | |
633 | [ilog2(VM_MAYREAD)] = "mr", | |
634 | [ilog2(VM_MAYWRITE)] = "mw", | |
635 | [ilog2(VM_MAYEXEC)] = "me", | |
636 | [ilog2(VM_MAYSHARE)] = "ms", | |
637 | [ilog2(VM_GROWSDOWN)] = "gd", | |
638 | [ilog2(VM_PFNMAP)] = "pf", | |
639 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
640 | #ifdef CONFIG_X86_INTEL_MPX |
641 | [ilog2(VM_MPX)] = "mp", | |
642 | #endif | |
834f82e2 CG |
643 | [ilog2(VM_LOCKED)] = "lo", |
644 | [ilog2(VM_IO)] = "io", | |
645 | [ilog2(VM_SEQ_READ)] = "sr", | |
646 | [ilog2(VM_RAND_READ)] = "rr", | |
647 | [ilog2(VM_DONTCOPY)] = "dc", | |
648 | [ilog2(VM_DONTEXPAND)] = "de", | |
649 | [ilog2(VM_ACCOUNT)] = "ac", | |
650 | [ilog2(VM_NORESERVE)] = "nr", | |
651 | [ilog2(VM_HUGETLB)] = "ht", | |
834f82e2 CG |
652 | [ilog2(VM_ARCH_1)] = "ar", |
653 | [ilog2(VM_DONTDUMP)] = "dd", | |
ec8e41ae NH |
654 | #ifdef CONFIG_MEM_SOFT_DIRTY |
655 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
656 | #endif | |
834f82e2 CG |
657 | [ilog2(VM_MIXEDMAP)] = "mm", |
658 | [ilog2(VM_HUGEPAGE)] = "hg", | |
659 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
660 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
661 | [ilog2(VM_UFFD_MISSING)]= "um", |
662 | [ilog2(VM_UFFD_WP)] = "uw", | |
c1192f84 DH |
663 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
664 | /* These come out via ProtectionKey: */ | |
665 | [ilog2(VM_PKEY_BIT0)] = "", | |
666 | [ilog2(VM_PKEY_BIT1)] = "", | |
667 | [ilog2(VM_PKEY_BIT2)] = "", | |
668 | [ilog2(VM_PKEY_BIT3)] = "", | |
669 | #endif | |
834f82e2 CG |
670 | }; |
671 | size_t i; | |
672 | ||
673 | seq_puts(m, "VmFlags: "); | |
674 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
675 | if (!mnemonics[i][0]) |
676 | continue; | |
834f82e2 CG |
677 | if (vma->vm_flags & (1UL << i)) { |
678 | seq_printf(m, "%c%c ", | |
679 | mnemonics[i][0], mnemonics[i][1]); | |
680 | } | |
681 | } | |
682 | seq_putc(m, '\n'); | |
683 | } | |
684 | ||
25ee01a2 NH |
685 | #ifdef CONFIG_HUGETLB_PAGE |
686 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
687 | unsigned long addr, unsigned long end, | |
688 | struct mm_walk *walk) | |
689 | { | |
690 | struct mem_size_stats *mss = walk->private; | |
691 | struct vm_area_struct *vma = walk->vma; | |
692 | struct page *page = NULL; | |
693 | ||
694 | if (pte_present(*pte)) { | |
695 | page = vm_normal_page(vma, addr, *pte); | |
696 | } else if (is_swap_pte(*pte)) { | |
697 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
698 | ||
699 | if (is_migration_entry(swpent)) | |
700 | page = migration_entry_to_page(swpent); | |
701 | } | |
702 | if (page) { | |
703 | int mapcount = page_mapcount(page); | |
704 | ||
705 | if (mapcount >= 2) | |
706 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
707 | else | |
708 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
709 | } | |
710 | return 0; | |
711 | } | |
712 | #endif /* HUGETLB_PAGE */ | |
713 | ||
c1192f84 DH |
714 | void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) |
715 | { | |
716 | } | |
717 | ||
b7643757 | 718 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 ML |
719 | { |
720 | struct vm_area_struct *vma = v; | |
e070ad49 | 721 | struct mem_size_stats mss; |
2165009b DH |
722 | struct mm_walk smaps_walk = { |
723 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
724 | #ifdef CONFIG_HUGETLB_PAGE |
725 | .hugetlb_entry = smaps_hugetlb_range, | |
726 | #endif | |
2165009b DH |
727 | .mm = vma->vm_mm, |
728 | .private = &mss, | |
729 | }; | |
e070ad49 ML |
730 | |
731 | memset(&mss, 0, sizeof mss); | |
c261e7d9 VB |
732 | |
733 | #ifdef CONFIG_SHMEM | |
734 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { | |
6a15a370 VB |
735 | /* |
736 | * For shared or readonly shmem mappings we know that all | |
737 | * swapped out pages belong to the shmem object, and we can | |
738 | * obtain the swap value much more efficiently. For private | |
739 | * writable mappings, we might have COW pages that are | |
740 | * not affected by the parent swapped out pages of the shmem | |
741 | * object, so we have to distinguish them during the page walk. | |
742 | * Unless we know that the shmem object (or the part mapped by | |
743 | * our VMA) has no swapped out pages at all. | |
744 | */ | |
745 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
746 | ||
747 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
748 | !(vma->vm_flags & VM_WRITE)) { | |
749 | mss.swap = shmem_swapped; | |
750 | } else { | |
751 | mss.check_shmem_swap = true; | |
752 | smaps_walk.pte_hole = smaps_pte_hole; | |
753 | } | |
c261e7d9 VB |
754 | } |
755 | #endif | |
756 | ||
d82ef020 | 757 | /* mmap_sem is held in m_start */ |
14eb6fdd | 758 | walk_page_vma(vma, &smaps_walk); |
4752c369 | 759 | |
b7643757 | 760 | show_map_vma(m, vma, is_pid); |
4752c369 MM |
761 | |
762 | seq_printf(m, | |
763 | "Size: %8lu kB\n" | |
764 | "Rss: %8lu kB\n" | |
765 | "Pss: %8lu kB\n" | |
766 | "Shared_Clean: %8lu kB\n" | |
767 | "Shared_Dirty: %8lu kB\n" | |
768 | "Private_Clean: %8lu kB\n" | |
769 | "Private_Dirty: %8lu kB\n" | |
214e471f | 770 | "Referenced: %8lu kB\n" |
b40d4f84 | 771 | "Anonymous: %8lu kB\n" |
4031a219 | 772 | "AnonHugePages: %8lu kB\n" |
25ee01a2 NH |
773 | "Shared_Hugetlb: %8lu kB\n" |
774 | "Private_Hugetlb: %7lu kB\n" | |
08fba699 | 775 | "Swap: %8lu kB\n" |
8334b962 | 776 | "SwapPss: %8lu kB\n" |
3340289d | 777 | "KernelPageSize: %8lu kB\n" |
2d90508f NK |
778 | "MMUPageSize: %8lu kB\n" |
779 | "Locked: %8lu kB\n", | |
4752c369 MM |
780 | (vma->vm_end - vma->vm_start) >> 10, |
781 | mss.resident >> 10, | |
782 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
783 | mss.shared_clean >> 10, | |
784 | mss.shared_dirty >> 10, | |
785 | mss.private_clean >> 10, | |
786 | mss.private_dirty >> 10, | |
214e471f | 787 | mss.referenced >> 10, |
b40d4f84 | 788 | mss.anonymous >> 10, |
4031a219 | 789 | mss.anonymous_thp >> 10, |
25ee01a2 NH |
790 | mss.shared_hugetlb >> 10, |
791 | mss.private_hugetlb >> 10, | |
08fba699 | 792 | mss.swap >> 10, |
8334b962 | 793 | (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)), |
3340289d | 794 | vma_kernel_pagesize(vma) >> 10, |
2d90508f NK |
795 | vma_mmu_pagesize(vma) >> 10, |
796 | (vma->vm_flags & VM_LOCKED) ? | |
797 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); | |
4752c369 | 798 | |
c1192f84 | 799 | arch_show_smap(m, vma); |
834f82e2 | 800 | show_smap_vma_flags(m, vma); |
b8c20a9b | 801 | m_cache_vma(m, vma); |
7c88db0c | 802 | return 0; |
e070ad49 ML |
803 | } |
804 | ||
b7643757 SP |
805 | static int show_pid_smap(struct seq_file *m, void *v) |
806 | { | |
807 | return show_smap(m, v, 1); | |
808 | } | |
809 | ||
810 | static int show_tid_smap(struct seq_file *m, void *v) | |
811 | { | |
812 | return show_smap(m, v, 0); | |
813 | } | |
814 | ||
03a44825 | 815 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
816 | .start = m_start, |
817 | .next = m_next, | |
818 | .stop = m_stop, | |
b7643757 SP |
819 | .show = show_pid_smap |
820 | }; | |
821 | ||
822 | static const struct seq_operations proc_tid_smaps_op = { | |
823 | .start = m_start, | |
824 | .next = m_next, | |
825 | .stop = m_stop, | |
826 | .show = show_tid_smap | |
a6198797 MM |
827 | }; |
828 | ||
b7643757 | 829 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
830 | { |
831 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
832 | } | |
833 | ||
b7643757 SP |
834 | static int tid_smaps_open(struct inode *inode, struct file *file) |
835 | { | |
836 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
837 | } | |
838 | ||
839 | const struct file_operations proc_pid_smaps_operations = { | |
840 | .open = pid_smaps_open, | |
841 | .read = seq_read, | |
842 | .llseek = seq_lseek, | |
29a40ace | 843 | .release = proc_map_release, |
b7643757 SP |
844 | }; |
845 | ||
846 | const struct file_operations proc_tid_smaps_operations = { | |
847 | .open = tid_smaps_open, | |
a6198797 MM |
848 | .read = seq_read, |
849 | .llseek = seq_lseek, | |
29a40ace | 850 | .release = proc_map_release, |
a6198797 MM |
851 | }; |
852 | ||
040fa020 PE |
853 | enum clear_refs_types { |
854 | CLEAR_REFS_ALL = 1, | |
855 | CLEAR_REFS_ANON, | |
856 | CLEAR_REFS_MAPPED, | |
0f8975ec | 857 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 858 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
859 | CLEAR_REFS_LAST, |
860 | }; | |
861 | ||
af9de7eb | 862 | struct clear_refs_private { |
0f8975ec | 863 | enum clear_refs_types type; |
af9de7eb PE |
864 | }; |
865 | ||
7d5b3bfa | 866 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
867 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
868 | unsigned long addr, pte_t *pte) | |
869 | { | |
0f8975ec PE |
870 | /* |
871 | * The soft-dirty tracker uses #PF-s to catch writes | |
872 | * to pages, so write-protect the pte as well. See the | |
873 | * Documentation/vm/soft-dirty.txt for full description | |
874 | * of how soft-dirty works. | |
875 | */ | |
876 | pte_t ptent = *pte; | |
179ef71c CG |
877 | |
878 | if (pte_present(ptent)) { | |
326c2597 | 879 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
179ef71c | 880 | ptent = pte_wrprotect(ptent); |
a7b76174 | 881 | ptent = pte_clear_soft_dirty(ptent); |
326c2597 | 882 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
179ef71c CG |
883 | } else if (is_swap_pte(ptent)) { |
884 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 885 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 886 | } |
0f8975ec | 887 | } |
5d3875a0 LD |
888 | #else |
889 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
890 | unsigned long addr, pte_t *pte) | |
891 | { | |
892 | } | |
893 | #endif | |
0f8975ec | 894 | |
5d3875a0 | 895 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
896 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
897 | unsigned long addr, pmd_t *pmdp) | |
898 | { | |
326c2597 | 899 | pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp); |
7d5b3bfa KS |
900 | |
901 | pmd = pmd_wrprotect(pmd); | |
a7b76174 | 902 | pmd = pmd_clear_soft_dirty(pmd); |
7d5b3bfa | 903 | |
7d5b3bfa KS |
904 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); |
905 | } | |
7d5b3bfa | 906 | #else |
7d5b3bfa KS |
907 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
908 | unsigned long addr, pmd_t *pmdp) | |
909 | { | |
910 | } | |
911 | #endif | |
912 | ||
a6198797 | 913 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 914 | unsigned long end, struct mm_walk *walk) |
a6198797 | 915 | { |
af9de7eb | 916 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 917 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
918 | pte_t *pte, ptent; |
919 | spinlock_t *ptl; | |
920 | struct page *page; | |
921 | ||
b6ec57f4 KS |
922 | ptl = pmd_trans_huge_lock(pmd, vma); |
923 | if (ptl) { | |
7d5b3bfa KS |
924 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
925 | clear_soft_dirty_pmd(vma, addr, pmd); | |
926 | goto out; | |
927 | } | |
928 | ||
929 | page = pmd_page(*pmd); | |
930 | ||
931 | /* Clear accessed and referenced bits. */ | |
932 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 933 | test_and_clear_page_young(page); |
7d5b3bfa KS |
934 | ClearPageReferenced(page); |
935 | out: | |
936 | spin_unlock(ptl); | |
937 | return 0; | |
938 | } | |
939 | ||
1a5a9906 AA |
940 | if (pmd_trans_unstable(pmd)) |
941 | return 0; | |
03319327 | 942 | |
a6198797 MM |
943 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
944 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
945 | ptent = *pte; | |
a6198797 | 946 | |
0f8975ec PE |
947 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
948 | clear_soft_dirty(vma, addr, pte); | |
949 | continue; | |
950 | } | |
951 | ||
179ef71c CG |
952 | if (!pte_present(ptent)) |
953 | continue; | |
954 | ||
a6198797 MM |
955 | page = vm_normal_page(vma, addr, ptent); |
956 | if (!page) | |
957 | continue; | |
958 | ||
959 | /* Clear accessed and referenced bits. */ | |
960 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 961 | test_and_clear_page_young(page); |
a6198797 MM |
962 | ClearPageReferenced(page); |
963 | } | |
964 | pte_unmap_unlock(pte - 1, ptl); | |
965 | cond_resched(); | |
966 | return 0; | |
967 | } | |
968 | ||
5c64f52a NH |
969 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
970 | struct mm_walk *walk) | |
971 | { | |
972 | struct clear_refs_private *cp = walk->private; | |
973 | struct vm_area_struct *vma = walk->vma; | |
974 | ||
48684a65 NH |
975 | if (vma->vm_flags & VM_PFNMAP) |
976 | return 1; | |
977 | ||
5c64f52a NH |
978 | /* |
979 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
980 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
981 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
982 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
983 | */ | |
984 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
985 | return 1; | |
986 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
987 | return 1; | |
988 | return 0; | |
989 | } | |
990 | ||
f248dcb3 MM |
991 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
992 | size_t count, loff_t *ppos) | |
b813e931 | 993 | { |
f248dcb3 | 994 | struct task_struct *task; |
fb92a4b0 | 995 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 996 | struct mm_struct *mm; |
b813e931 | 997 | struct vm_area_struct *vma; |
040fa020 PE |
998 | enum clear_refs_types type; |
999 | int itype; | |
0a8cb8e3 | 1000 | int rv; |
b813e931 | 1001 | |
f248dcb3 MM |
1002 | memset(buffer, 0, sizeof(buffer)); |
1003 | if (count > sizeof(buffer) - 1) | |
1004 | count = sizeof(buffer) - 1; | |
1005 | if (copy_from_user(buffer, buf, count)) | |
1006 | return -EFAULT; | |
040fa020 | 1007 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1008 | if (rv < 0) |
1009 | return rv; | |
040fa020 PE |
1010 | type = (enum clear_refs_types)itype; |
1011 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1012 | return -EINVAL; |
541c237c | 1013 | |
496ad9aa | 1014 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1015 | if (!task) |
1016 | return -ESRCH; | |
1017 | mm = get_task_mm(task); | |
1018 | if (mm) { | |
af9de7eb | 1019 | struct clear_refs_private cp = { |
0f8975ec | 1020 | .type = type, |
af9de7eb | 1021 | }; |
20cbc972 AM |
1022 | struct mm_walk clear_refs_walk = { |
1023 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 1024 | .test_walk = clear_refs_test_walk, |
20cbc972 | 1025 | .mm = mm, |
af9de7eb | 1026 | .private = &cp, |
20cbc972 | 1027 | }; |
695f0559 PC |
1028 | |
1029 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
4e80153a MH |
1030 | if (down_write_killable(&mm->mmap_sem)) { |
1031 | count = -EINTR; | |
1032 | goto out_mm; | |
1033 | } | |
1034 | ||
695f0559 PC |
1035 | /* |
1036 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1037 | * resident set size to this mm's current rss value. | |
1038 | */ | |
695f0559 PC |
1039 | reset_mm_hiwater_rss(mm); |
1040 | up_write(&mm->mmap_sem); | |
1041 | goto out_mm; | |
1042 | } | |
1043 | ||
f248dcb3 | 1044 | down_read(&mm->mmap_sem); |
64e45507 PF |
1045 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1046 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1047 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1048 | continue; | |
1049 | up_read(&mm->mmap_sem); | |
4e80153a MH |
1050 | if (down_write_killable(&mm->mmap_sem)) { |
1051 | count = -EINTR; | |
1052 | goto out_mm; | |
1053 | } | |
64e45507 PF |
1054 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1055 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1056 | vma_set_page_prot(vma); | |
1057 | } | |
1058 | downgrade_write(&mm->mmap_sem); | |
1059 | break; | |
1060 | } | |
0f8975ec | 1061 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 1062 | } |
5c64f52a | 1063 | walk_page_range(0, ~0UL, &clear_refs_walk); |
0f8975ec PE |
1064 | if (type == CLEAR_REFS_SOFT_DIRTY) |
1065 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
f248dcb3 MM |
1066 | flush_tlb_mm(mm); |
1067 | up_read(&mm->mmap_sem); | |
695f0559 | 1068 | out_mm: |
f248dcb3 MM |
1069 | mmput(mm); |
1070 | } | |
1071 | put_task_struct(task); | |
fb92a4b0 VL |
1072 | |
1073 | return count; | |
b813e931 DR |
1074 | } |
1075 | ||
f248dcb3 MM |
1076 | const struct file_operations proc_clear_refs_operations = { |
1077 | .write = clear_refs_write, | |
6038f373 | 1078 | .llseek = noop_llseek, |
f248dcb3 MM |
1079 | }; |
1080 | ||
092b50ba NH |
1081 | typedef struct { |
1082 | u64 pme; | |
1083 | } pagemap_entry_t; | |
1084 | ||
85863e47 | 1085 | struct pagemapread { |
8c829622 | 1086 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1087 | pagemap_entry_t *buffer; |
1c90308e | 1088 | bool show_pfn; |
85863e47 MM |
1089 | }; |
1090 | ||
5aaabe83 NH |
1091 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1092 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1093 | ||
deb94544 KK |
1094 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1095 | #define PM_PFRAME_BITS 55 | |
1096 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1097 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1098 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1099 | #define PM_FILE BIT_ULL(61) |
1100 | #define PM_SWAP BIT_ULL(62) | |
1101 | #define PM_PRESENT BIT_ULL(63) | |
1102 | ||
85863e47 MM |
1103 | #define PM_END_OF_BUFFER 1 |
1104 | ||
deb94544 | 1105 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1106 | { |
deb94544 | 1107 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1108 | } |
1109 | ||
1110 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1111 | struct pagemapread *pm) |
1112 | { | |
092b50ba | 1113 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1114 | if (pm->pos >= pm->len) |
aae8679b | 1115 | return PM_END_OF_BUFFER; |
85863e47 MM |
1116 | return 0; |
1117 | } | |
1118 | ||
1119 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1120 | struct mm_walk *walk) |
85863e47 | 1121 | { |
2165009b | 1122 | struct pagemapread *pm = walk->private; |
68b5a652 | 1123 | unsigned long addr = start; |
85863e47 | 1124 | int err = 0; |
092b50ba | 1125 | |
68b5a652 PF |
1126 | while (addr < end) { |
1127 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1128 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1129 | /* End of address space hole, which we mark as non-present. */ |
1130 | unsigned long hole_end; | |
68b5a652 | 1131 | |
87e6d49a PF |
1132 | if (vma) |
1133 | hole_end = min(end, vma->vm_start); | |
1134 | else | |
1135 | hole_end = end; | |
1136 | ||
1137 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1138 | err = add_to_pagemap(addr, &pme, pm); | |
1139 | if (err) | |
1140 | goto out; | |
68b5a652 PF |
1141 | } |
1142 | ||
87e6d49a PF |
1143 | if (!vma) |
1144 | break; | |
1145 | ||
1146 | /* Addresses in the VMA. */ | |
1147 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1148 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1149 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1150 | err = add_to_pagemap(addr, &pme, pm); |
1151 | if (err) | |
1152 | goto out; | |
1153 | } | |
85863e47 | 1154 | } |
68b5a652 | 1155 | out: |
85863e47 MM |
1156 | return err; |
1157 | } | |
1158 | ||
deb94544 | 1159 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1160 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1161 | { |
deb94544 | 1162 | u64 frame = 0, flags = 0; |
052fb0d6 | 1163 | struct page *page = NULL; |
85863e47 | 1164 | |
052fb0d6 | 1165 | if (pte_present(pte)) { |
1c90308e KK |
1166 | if (pm->show_pfn) |
1167 | frame = pte_pfn(pte); | |
deb94544 | 1168 | flags |= PM_PRESENT; |
052fb0d6 | 1169 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1170 | if (pte_soft_dirty(pte)) |
deb94544 | 1171 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1172 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1173 | swp_entry_t entry; |
1174 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1175 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1176 | entry = pte_to_swp_entry(pte); |
052fb0d6 KK |
1177 | frame = swp_type(entry) | |
1178 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1179 | flags |= PM_SWAP; |
052fb0d6 KK |
1180 | if (is_migration_entry(entry)) |
1181 | page = migration_entry_to_page(entry); | |
052fb0d6 KK |
1182 | } |
1183 | ||
1184 | if (page && !PageAnon(page)) | |
1185 | flags |= PM_FILE; | |
77bb499b KK |
1186 | if (page && page_mapcount(page) == 1) |
1187 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1188 | if (vma->vm_flags & VM_SOFTDIRTY) |
1189 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1190 | |
deb94544 | 1191 | return make_pme(frame, flags); |
bcf8039e DH |
1192 | } |
1193 | ||
356515e7 | 1194 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1195 | struct mm_walk *walk) |
85863e47 | 1196 | { |
f995ece2 | 1197 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1198 | struct pagemapread *pm = walk->private; |
bf929152 | 1199 | spinlock_t *ptl; |
05fbf357 | 1200 | pte_t *pte, *orig_pte; |
85863e47 MM |
1201 | int err = 0; |
1202 | ||
356515e7 | 1203 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1204 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1205 | if (ptl) { | |
356515e7 KK |
1206 | u64 flags = 0, frame = 0; |
1207 | pmd_t pmd = *pmdp; | |
0f8975ec | 1208 | |
356515e7 | 1209 | if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd)) |
deb94544 | 1210 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1211 | |
356515e7 KK |
1212 | /* |
1213 | * Currently pmd for thp is always present because thp | |
1214 | * can not be swapped-out, migrated, or HWPOISONed | |
1215 | * (split in such cases instead.) | |
1216 | * This if-check is just to prepare for future implementation. | |
1217 | */ | |
1218 | if (pmd_present(pmd)) { | |
77bb499b KK |
1219 | struct page *page = pmd_page(pmd); |
1220 | ||
1221 | if (page_mapcount(page) == 1) | |
1222 | flags |= PM_MMAP_EXCLUSIVE; | |
1223 | ||
356515e7 | 1224 | flags |= PM_PRESENT; |
1c90308e KK |
1225 | if (pm->show_pfn) |
1226 | frame = pmd_pfn(pmd) + | |
1227 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 KK |
1228 | } |
1229 | ||
025c5b24 | 1230 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1231 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1232 | |
092b50ba | 1233 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1234 | if (err) |
1235 | break; | |
1c90308e | 1236 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1237 | frame++; |
5aaabe83 | 1238 | } |
bf929152 | 1239 | spin_unlock(ptl); |
025c5b24 | 1240 | return err; |
5aaabe83 NH |
1241 | } |
1242 | ||
356515e7 | 1243 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1244 | return 0; |
356515e7 | 1245 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1246 | |
f995ece2 NH |
1247 | /* |
1248 | * We can assume that @vma always points to a valid one and @end never | |
1249 | * goes beyond vma->vm_end. | |
1250 | */ | |
356515e7 | 1251 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1252 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1253 | pagemap_entry_t pme; | |
05fbf357 | 1254 | |
deb94544 | 1255 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1256 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1257 | if (err) |
81d0fa62 | 1258 | break; |
85863e47 | 1259 | } |
f995ece2 | 1260 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1261 | |
1262 | cond_resched(); | |
1263 | ||
1264 | return err; | |
1265 | } | |
1266 | ||
1a5cb814 | 1267 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1268 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1269 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1270 | unsigned long addr, unsigned long end, |
1271 | struct mm_walk *walk) | |
5dc37642 | 1272 | { |
5dc37642 | 1273 | struct pagemapread *pm = walk->private; |
f995ece2 | 1274 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1275 | u64 flags = 0, frame = 0; |
5dc37642 | 1276 | int err = 0; |
356515e7 | 1277 | pte_t pte; |
5dc37642 | 1278 | |
f995ece2 | 1279 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1280 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1281 | |
356515e7 KK |
1282 | pte = huge_ptep_get(ptep); |
1283 | if (pte_present(pte)) { | |
1284 | struct page *page = pte_page(pte); | |
1285 | ||
1286 | if (!PageAnon(page)) | |
1287 | flags |= PM_FILE; | |
1288 | ||
77bb499b KK |
1289 | if (page_mapcount(page) == 1) |
1290 | flags |= PM_MMAP_EXCLUSIVE; | |
1291 | ||
356515e7 | 1292 | flags |= PM_PRESENT; |
1c90308e KK |
1293 | if (pm->show_pfn) |
1294 | frame = pte_pfn(pte) + | |
1295 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1296 | } |
1297 | ||
5dc37642 | 1298 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1299 | pagemap_entry_t pme = make_pme(frame, flags); |
1300 | ||
092b50ba | 1301 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1302 | if (err) |
1303 | return err; | |
1c90308e | 1304 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1305 | frame++; |
5dc37642 NH |
1306 | } |
1307 | ||
1308 | cond_resched(); | |
1309 | ||
1310 | return err; | |
1311 | } | |
1a5cb814 | 1312 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1313 | |
85863e47 MM |
1314 | /* |
1315 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1316 | * | |
f16278c6 HR |
1317 | * For each page in the address space, this file contains one 64-bit entry |
1318 | * consisting of the following: | |
1319 | * | |
052fb0d6 | 1320 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1321 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1322 | * Bits 5-54 swap offset if swapped |
deb94544 | 1323 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
77bb499b KK |
1324 | * Bit 56 page exclusively mapped |
1325 | * Bits 57-60 zero | |
052fb0d6 | 1326 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1327 | * Bit 62 page swapped |
1328 | * Bit 63 page present | |
1329 | * | |
1330 | * If the page is not present but in swap, then the PFN contains an | |
1331 | * encoding of the swap file number and the page's offset into the | |
1332 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1333 | * precisely which pages are mapped (or in swap) and comparing mapped |
1334 | * pages between processes. | |
1335 | * | |
1336 | * Efficient users of this interface will use /proc/pid/maps to | |
1337 | * determine which areas of memory are actually mapped and llseek to | |
1338 | * skip over unmapped regions. | |
1339 | */ | |
1340 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1341 | size_t count, loff_t *ppos) | |
1342 | { | |
a06db751 | 1343 | struct mm_struct *mm = file->private_data; |
85863e47 | 1344 | struct pagemapread pm; |
ee1e6ab6 | 1345 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1346 | unsigned long src; |
1347 | unsigned long svpfn; | |
1348 | unsigned long start_vaddr; | |
1349 | unsigned long end_vaddr; | |
a06db751 | 1350 | int ret = 0, copied = 0; |
85863e47 | 1351 | |
a06db751 | 1352 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) |
85863e47 MM |
1353 | goto out; |
1354 | ||
85863e47 MM |
1355 | ret = -EINVAL; |
1356 | /* file position must be aligned */ | |
aae8679b | 1357 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1358 | goto out_mm; |
85863e47 MM |
1359 | |
1360 | ret = 0; | |
08161786 | 1361 | if (!count) |
a06db751 | 1362 | goto out_mm; |
08161786 | 1363 | |
1c90308e KK |
1364 | /* do not disclose physical addresses: attack vector */ |
1365 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1366 | ||
8c829622 | 1367 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
1368 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); | |
5d7e0d2b | 1369 | ret = -ENOMEM; |
d82ef020 | 1370 | if (!pm.buffer) |
a06db751 | 1371 | goto out_mm; |
85863e47 | 1372 | |
356515e7 | 1373 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1374 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1375 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1376 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1377 | #endif |
5d7e0d2b AM |
1378 | pagemap_walk.mm = mm; |
1379 | pagemap_walk.private = ± | |
1380 | ||
1381 | src = *ppos; | |
1382 | svpfn = src / PM_ENTRY_BYTES; | |
1383 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1384 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1385 | |
1386 | /* watch out for wraparound */ | |
a06db751 | 1387 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1388 | start_vaddr = end_vaddr; |
1389 | ||
1390 | /* | |
1391 | * The odds are that this will stop walking way | |
1392 | * before end_vaddr, because the length of the | |
1393 | * user buffer is tracked in "pm", and the walk | |
1394 | * will stop when we hit the end of the buffer. | |
1395 | */ | |
d82ef020 KH |
1396 | ret = 0; |
1397 | while (count && (start_vaddr < end_vaddr)) { | |
1398 | int len; | |
1399 | unsigned long end; | |
1400 | ||
1401 | pm.pos = 0; | |
ea251c1d | 1402 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1403 | /* overflow ? */ |
1404 | if (end < start_vaddr || end > end_vaddr) | |
1405 | end = end_vaddr; | |
1406 | down_read(&mm->mmap_sem); | |
1407 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1408 | up_read(&mm->mmap_sem); | |
1409 | start_vaddr = end; | |
1410 | ||
1411 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1412 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1413 | ret = -EFAULT; |
a06db751 | 1414 | goto out_free; |
d82ef020 KH |
1415 | } |
1416 | copied += len; | |
1417 | buf += len; | |
1418 | count -= len; | |
85863e47 | 1419 | } |
d82ef020 KH |
1420 | *ppos += copied; |
1421 | if (!ret || ret == PM_END_OF_BUFFER) | |
1422 | ret = copied; | |
1423 | ||
98bc93e5 KM |
1424 | out_free: |
1425 | kfree(pm.buffer); | |
a06db751 KK |
1426 | out_mm: |
1427 | mmput(mm); | |
85863e47 MM |
1428 | out: |
1429 | return ret; | |
1430 | } | |
1431 | ||
541c237c PE |
1432 | static int pagemap_open(struct inode *inode, struct file *file) |
1433 | { | |
a06db751 KK |
1434 | struct mm_struct *mm; |
1435 | ||
a06db751 KK |
1436 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1437 | if (IS_ERR(mm)) | |
1438 | return PTR_ERR(mm); | |
1439 | file->private_data = mm; | |
1440 | return 0; | |
1441 | } | |
1442 | ||
1443 | static int pagemap_release(struct inode *inode, struct file *file) | |
1444 | { | |
1445 | struct mm_struct *mm = file->private_data; | |
1446 | ||
1447 | if (mm) | |
1448 | mmdrop(mm); | |
541c237c PE |
1449 | return 0; |
1450 | } | |
1451 | ||
85863e47 MM |
1452 | const struct file_operations proc_pagemap_operations = { |
1453 | .llseek = mem_lseek, /* borrow this */ | |
1454 | .read = pagemap_read, | |
541c237c | 1455 | .open = pagemap_open, |
a06db751 | 1456 | .release = pagemap_release, |
85863e47 | 1457 | }; |
1e883281 | 1458 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1459 | |
6e21c8f1 | 1460 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1461 | |
f69ff943 | 1462 | struct numa_maps { |
f69ff943 SW |
1463 | unsigned long pages; |
1464 | unsigned long anon; | |
1465 | unsigned long active; | |
1466 | unsigned long writeback; | |
1467 | unsigned long mapcount_max; | |
1468 | unsigned long dirty; | |
1469 | unsigned long swapcache; | |
1470 | unsigned long node[MAX_NUMNODES]; | |
1471 | }; | |
1472 | ||
5b52fc89 SW |
1473 | struct numa_maps_private { |
1474 | struct proc_maps_private proc_maps; | |
1475 | struct numa_maps md; | |
1476 | }; | |
1477 | ||
eb4866d0 DH |
1478 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1479 | unsigned long nr_pages) | |
f69ff943 SW |
1480 | { |
1481 | int count = page_mapcount(page); | |
1482 | ||
eb4866d0 | 1483 | md->pages += nr_pages; |
f69ff943 | 1484 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1485 | md->dirty += nr_pages; |
f69ff943 SW |
1486 | |
1487 | if (PageSwapCache(page)) | |
eb4866d0 | 1488 | md->swapcache += nr_pages; |
f69ff943 SW |
1489 | |
1490 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1491 | md->active += nr_pages; |
f69ff943 SW |
1492 | |
1493 | if (PageWriteback(page)) | |
eb4866d0 | 1494 | md->writeback += nr_pages; |
f69ff943 SW |
1495 | |
1496 | if (PageAnon(page)) | |
eb4866d0 | 1497 | md->anon += nr_pages; |
f69ff943 SW |
1498 | |
1499 | if (count > md->mapcount_max) | |
1500 | md->mapcount_max = count; | |
1501 | ||
eb4866d0 | 1502 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1503 | } |
1504 | ||
3200a8aa DH |
1505 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1506 | unsigned long addr) | |
1507 | { | |
1508 | struct page *page; | |
1509 | int nid; | |
1510 | ||
1511 | if (!pte_present(pte)) | |
1512 | return NULL; | |
1513 | ||
1514 | page = vm_normal_page(vma, addr, pte); | |
1515 | if (!page) | |
1516 | return NULL; | |
1517 | ||
1518 | if (PageReserved(page)) | |
1519 | return NULL; | |
1520 | ||
1521 | nid = page_to_nid(page); | |
4ff1b2c2 | 1522 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1523 | return NULL; |
1524 | ||
1525 | return page; | |
1526 | } | |
1527 | ||
28093f9f GS |
1528 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1529 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1530 | struct vm_area_struct *vma, | |
1531 | unsigned long addr) | |
1532 | { | |
1533 | struct page *page; | |
1534 | int nid; | |
1535 | ||
1536 | if (!pmd_present(pmd)) | |
1537 | return NULL; | |
1538 | ||
1539 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1540 | if (!page) | |
1541 | return NULL; | |
1542 | ||
1543 | if (PageReserved(page)) | |
1544 | return NULL; | |
1545 | ||
1546 | nid = page_to_nid(page); | |
1547 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1548 | return NULL; | |
1549 | ||
1550 | return page; | |
1551 | } | |
1552 | #endif | |
1553 | ||
f69ff943 SW |
1554 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1555 | unsigned long end, struct mm_walk *walk) | |
1556 | { | |
d85f4d6d NH |
1557 | struct numa_maps *md = walk->private; |
1558 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1559 | spinlock_t *ptl; |
1560 | pte_t *orig_pte; | |
1561 | pte_t *pte; | |
1562 | ||
28093f9f | 1563 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1564 | ptl = pmd_trans_huge_lock(pmd, vma); |
1565 | if (ptl) { | |
025c5b24 NH |
1566 | struct page *page; |
1567 | ||
28093f9f | 1568 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1569 | if (page) |
28093f9f | 1570 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1571 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1572 | spin_unlock(ptl); |
025c5b24 | 1573 | return 0; |
32ef4384 DH |
1574 | } |
1575 | ||
1a5a9906 AA |
1576 | if (pmd_trans_unstable(pmd)) |
1577 | return 0; | |
28093f9f | 1578 | #endif |
f69ff943 SW |
1579 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1580 | do { | |
d85f4d6d | 1581 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1582 | if (!page) |
1583 | continue; | |
eb4866d0 | 1584 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1585 | |
1586 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1587 | pte_unmap_unlock(orig_pte, ptl); | |
1588 | return 0; | |
1589 | } | |
1590 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1591 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1592 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1593 | { | |
5c2ff95e | 1594 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1595 | struct numa_maps *md; |
1596 | struct page *page; | |
1597 | ||
5c2ff95e | 1598 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1599 | return 0; |
1600 | ||
5c2ff95e | 1601 | page = pte_page(huge_pte); |
f69ff943 SW |
1602 | if (!page) |
1603 | return 0; | |
1604 | ||
1605 | md = walk->private; | |
5c2ff95e | 1606 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1607 | return 0; |
1608 | } | |
1609 | ||
1610 | #else | |
632fd60f | 1611 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1612 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1613 | { | |
1614 | return 0; | |
1615 | } | |
1616 | #endif | |
1617 | ||
1618 | /* | |
1619 | * Display pages allocated per node and memory policy via /proc. | |
1620 | */ | |
b7643757 | 1621 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1622 | { |
5b52fc89 SW |
1623 | struct numa_maps_private *numa_priv = m->private; |
1624 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1625 | struct vm_area_struct *vma = v; |
5b52fc89 | 1626 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1627 | struct file *file = vma->vm_file; |
1628 | struct mm_struct *mm = vma->vm_mm; | |
d85f4d6d NH |
1629 | struct mm_walk walk = { |
1630 | .hugetlb_entry = gather_hugetlb_stats, | |
1631 | .pmd_entry = gather_pte_stats, | |
1632 | .private = md, | |
1633 | .mm = mm, | |
1634 | }; | |
f69ff943 | 1635 | struct mempolicy *pol; |
948927ee DR |
1636 | char buffer[64]; |
1637 | int nid; | |
f69ff943 SW |
1638 | |
1639 | if (!mm) | |
1640 | return 0; | |
1641 | ||
5b52fc89 SW |
1642 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1643 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1644 | |
498f2371 ON |
1645 | pol = __get_vma_policy(vma, vma->vm_start); |
1646 | if (pol) { | |
1647 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1648 | mpol_cond_put(pol); | |
1649 | } else { | |
1650 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1651 | } | |
f69ff943 SW |
1652 | |
1653 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1654 | ||
1655 | if (file) { | |
17c2b4ee | 1656 | seq_puts(m, " file="); |
2726d566 | 1657 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1658 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1659 | seq_puts(m, " heap"); |
65376df5 JW |
1660 | } else if (is_stack(proc_priv, vma, is_pid)) { |
1661 | seq_puts(m, " stack"); | |
f69ff943 SW |
1662 | } |
1663 | ||
fc360bd9 | 1664 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1665 | seq_puts(m, " huge"); |
fc360bd9 | 1666 | |
d85f4d6d NH |
1667 | /* mmap_sem is held by m_start */ |
1668 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1669 | |
1670 | if (!md->pages) | |
1671 | goto out; | |
1672 | ||
1673 | if (md->anon) | |
1674 | seq_printf(m, " anon=%lu", md->anon); | |
1675 | ||
1676 | if (md->dirty) | |
1677 | seq_printf(m, " dirty=%lu", md->dirty); | |
1678 | ||
1679 | if (md->pages != md->anon && md->pages != md->dirty) | |
1680 | seq_printf(m, " mapped=%lu", md->pages); | |
1681 | ||
1682 | if (md->mapcount_max > 1) | |
1683 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1684 | ||
1685 | if (md->swapcache) | |
1686 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1687 | ||
1688 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1689 | seq_printf(m, " active=%lu", md->active); | |
1690 | ||
1691 | if (md->writeback) | |
1692 | seq_printf(m, " writeback=%lu", md->writeback); | |
1693 | ||
948927ee DR |
1694 | for_each_node_state(nid, N_MEMORY) |
1695 | if (md->node[nid]) | |
1696 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1697 | |
1698 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1699 | out: |
1700 | seq_putc(m, '\n'); | |
b8c20a9b | 1701 | m_cache_vma(m, vma); |
f69ff943 SW |
1702 | return 0; |
1703 | } | |
5b52fc89 | 1704 | |
b7643757 SP |
1705 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1706 | { | |
1707 | return show_numa_map(m, v, 1); | |
1708 | } | |
1709 | ||
1710 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1711 | { | |
1712 | return show_numa_map(m, v, 0); | |
1713 | } | |
1714 | ||
03a44825 | 1715 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1716 | .start = m_start, |
1717 | .next = m_next, | |
1718 | .stop = m_stop, | |
1719 | .show = show_pid_numa_map, | |
6e21c8f1 | 1720 | }; |
662795de | 1721 | |
b7643757 SP |
1722 | static const struct seq_operations proc_tid_numa_maps_op = { |
1723 | .start = m_start, | |
1724 | .next = m_next, | |
1725 | .stop = m_stop, | |
1726 | .show = show_tid_numa_map, | |
1727 | }; | |
1728 | ||
1729 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1730 | const struct seq_operations *ops) | |
662795de | 1731 | { |
4db7d0ee ON |
1732 | return proc_maps_open(inode, file, ops, |
1733 | sizeof(struct numa_maps_private)); | |
662795de EB |
1734 | } |
1735 | ||
b7643757 SP |
1736 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1737 | { | |
1738 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1739 | } | |
1740 | ||
1741 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1742 | { | |
1743 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1744 | } | |
1745 | ||
1746 | const struct file_operations proc_pid_numa_maps_operations = { | |
1747 | .open = pid_numa_maps_open, | |
1748 | .read = seq_read, | |
1749 | .llseek = seq_lseek, | |
29a40ace | 1750 | .release = proc_map_release, |
b7643757 SP |
1751 | }; |
1752 | ||
1753 | const struct file_operations proc_tid_numa_maps_operations = { | |
1754 | .open = tid_numa_maps_open, | |
662795de EB |
1755 | .read = seq_read, |
1756 | .llseek = seq_lseek, | |
29a40ace | 1757 | .release = proc_map_release, |
662795de | 1758 | }; |
f69ff943 | 1759 | #endif /* CONFIG_NUMA */ |