Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a520110e | 2 | #include <linux/pagewalk.h> |
615d6e87 | 3 | #include <linux/vmacache.h> |
1da177e4 | 4 | #include <linux/hugetlb.h> |
22e057c5 | 5 | #include <linux/huge_mm.h> |
1da177e4 LT |
6 | #include <linux/mount.h> |
7 | #include <linux/seq_file.h> | |
e070ad49 | 8 | #include <linux/highmem.h> |
5096add8 | 9 | #include <linux/ptrace.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
6e21c8f1 CL |
11 | #include <linux/pagemap.h> |
12 | #include <linux/mempolicy.h> | |
22e057c5 | 13 | #include <linux/rmap.h> |
85863e47 | 14 | #include <linux/swap.h> |
6e84f315 | 15 | #include <linux/sched/mm.h> |
85863e47 | 16 | #include <linux/swapops.h> |
0f8975ec | 17 | #include <linux/mmu_notifier.h> |
33c3fc71 | 18 | #include <linux/page_idle.h> |
6a15a370 | 19 | #include <linux/shmem_fs.h> |
b3a81d08 | 20 | #include <linux/uaccess.h> |
27cca866 | 21 | #include <linux/pkeys.h> |
e070ad49 | 22 | |
1da177e4 | 23 | #include <asm/elf.h> |
b3a81d08 | 24 | #include <asm/tlb.h> |
e070ad49 | 25 | #include <asm/tlbflush.h> |
1da177e4 LT |
26 | #include "internal.h" |
27 | ||
d1be35cb AV |
28 | #define SEQ_PUT_DEC(str, val) \ |
29 | seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) | |
df5f8314 | 30 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 31 | { |
af5b0f6a | 32 | unsigned long text, lib, swap, anon, file, shmem; |
365e9c87 HD |
33 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
34 | ||
8cee852e JM |
35 | anon = get_mm_counter(mm, MM_ANONPAGES); |
36 | file = get_mm_counter(mm, MM_FILEPAGES); | |
37 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
38 | ||
365e9c87 HD |
39 | /* |
40 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
41 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
42 | * collector of these hiwater stats must therefore get total_vm | |
43 | * and rss too, which will usually be the higher. Barriers? not | |
44 | * worth the effort, such snapshots can always be inconsistent. | |
45 | */ | |
46 | hiwater_vm = total_vm = mm->total_vm; | |
47 | if (hiwater_vm < mm->hiwater_vm) | |
48 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 49 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
50 | if (hiwater_rss < mm->hiwater_rss) |
51 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 52 | |
8526d84f KK |
53 | /* split executable areas between text and lib */ |
54 | text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK); | |
55 | text = min(text, mm->exec_vm << PAGE_SHIFT); | |
56 | lib = (mm->exec_vm << PAGE_SHIFT) - text; | |
57 | ||
b084d435 | 58 | swap = get_mm_counter(mm, MM_SWAPENTS); |
d1be35cb AV |
59 | SEQ_PUT_DEC("VmPeak:\t", hiwater_vm); |
60 | SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm); | |
61 | SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm); | |
70f8a3ca | 62 | SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm)); |
d1be35cb AV |
63 | SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss); |
64 | SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss); | |
65 | SEQ_PUT_DEC(" kB\nRssAnon:\t", anon); | |
66 | SEQ_PUT_DEC(" kB\nRssFile:\t", file); | |
67 | SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem); | |
68 | SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm); | |
69 | SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm); | |
70 | seq_put_decimal_ull_width(m, | |
71 | " kB\nVmExe:\t", text >> 10, 8); | |
72 | seq_put_decimal_ull_width(m, | |
73 | " kB\nVmLib:\t", lib >> 10, 8); | |
74 | seq_put_decimal_ull_width(m, | |
75 | " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8); | |
76 | SEQ_PUT_DEC(" kB\nVmSwap:\t", swap); | |
77 | seq_puts(m, " kB\n"); | |
5d317b2b | 78 | hugetlb_report_usage(m, mm); |
1da177e4 | 79 | } |
d1be35cb | 80 | #undef SEQ_PUT_DEC |
1da177e4 LT |
81 | |
82 | unsigned long task_vsize(struct mm_struct *mm) | |
83 | { | |
84 | return PAGE_SIZE * mm->total_vm; | |
85 | } | |
86 | ||
a2ade7b6 AD |
87 | unsigned long task_statm(struct mm_struct *mm, |
88 | unsigned long *shared, unsigned long *text, | |
89 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 90 | { |
eca56ff9 JM |
91 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
92 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
93 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
94 | >> PAGE_SHIFT; | |
84638335 | 95 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 96 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
97 | return mm->total_vm; |
98 | } | |
99 | ||
9e781440 KH |
100 | #ifdef CONFIG_NUMA |
101 | /* | |
498f2371 | 102 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
103 | */ |
104 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
105 | { | |
106 | struct task_struct *task = priv->task; | |
107 | ||
108 | task_lock(task); | |
498f2371 | 109 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
110 | mpol_get(priv->task_mempolicy); |
111 | task_unlock(task); | |
112 | } | |
113 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
114 | { | |
115 | mpol_put(priv->task_mempolicy); | |
116 | } | |
117 | #else | |
118 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
119 | { | |
120 | } | |
121 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
122 | { | |
123 | } | |
124 | #endif | |
125 | ||
0c255321 | 126 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 127 | { |
a6198797 | 128 | struct proc_maps_private *priv = m->private; |
4781f2c3 | 129 | unsigned long last_addr = *ppos; |
a6198797 | 130 | struct mm_struct *mm; |
0c255321 | 131 | struct vm_area_struct *vma; |
a6198797 | 132 | |
c2e88d22 | 133 | /* See m_next(). Zero at the start or after lseek. */ |
b8c20a9b ON |
134 | if (last_addr == -1UL) |
135 | return NULL; | |
136 | ||
2c03376d | 137 | priv->task = get_proc_task(priv->inode); |
a6198797 | 138 | if (!priv->task) |
ec6fd8a4 | 139 | return ERR_PTR(-ESRCH); |
a6198797 | 140 | |
29a40ace | 141 | mm = priv->mm; |
d07ded61 MWO |
142 | if (!mm || !mmget_not_zero(mm)) { |
143 | put_task_struct(priv->task); | |
144 | priv->task = NULL; | |
29a40ace | 145 | return NULL; |
d07ded61 | 146 | } |
a6198797 | 147 | |
d8ed45c5 | 148 | if (mmap_read_lock_killable(mm)) { |
8a713e7d | 149 | mmput(mm); |
d07ded61 MWO |
150 | put_task_struct(priv->task); |
151 | priv->task = NULL; | |
8a713e7d KK |
152 | return ERR_PTR(-EINTR); |
153 | } | |
154 | ||
9e781440 | 155 | hold_task_mempolicy(priv); |
0c255321 | 156 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 157 | |
c2e88d22 MWO |
158 | vma = find_vma(mm, last_addr); |
159 | if (vma) | |
a6198797 | 160 | return vma; |
59b4bf12 | 161 | |
c2e88d22 | 162 | return priv->tail_vma; |
a6198797 MM |
163 | } |
164 | ||
4781f2c3 | 165 | static void *m_next(struct seq_file *m, void *v, loff_t *ppos) |
a6198797 MM |
166 | { |
167 | struct proc_maps_private *priv = m->private; | |
fad95500 MWO |
168 | struct vm_area_struct *next, *vma = v; |
169 | ||
170 | if (vma == priv->tail_vma) | |
171 | next = NULL; | |
172 | else if (vma->vm_next) | |
173 | next = vma->vm_next; | |
174 | else | |
175 | next = priv->tail_vma; | |
a6198797 | 176 | |
4781f2c3 | 177 | *ppos = next ? next->vm_start : -1UL; |
c2e88d22 | 178 | |
59b4bf12 | 179 | return next; |
a6198797 MM |
180 | } |
181 | ||
182 | static void m_stop(struct seq_file *m, void *v) | |
183 | { | |
184 | struct proc_maps_private *priv = m->private; | |
d07ded61 | 185 | struct mm_struct *mm = priv->mm; |
a6198797 | 186 | |
d07ded61 MWO |
187 | if (!priv->task) |
188 | return; | |
189 | ||
190 | release_task_mempolicy(priv); | |
d8ed45c5 | 191 | mmap_read_unlock(mm); |
d07ded61 MWO |
192 | mmput(mm); |
193 | put_task_struct(priv->task); | |
194 | priv->task = NULL; | |
a6198797 MM |
195 | } |
196 | ||
4db7d0ee ON |
197 | static int proc_maps_open(struct inode *inode, struct file *file, |
198 | const struct seq_operations *ops, int psize) | |
199 | { | |
200 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
201 | ||
202 | if (!priv) | |
203 | return -ENOMEM; | |
204 | ||
2c03376d | 205 | priv->inode = inode; |
29a40ace ON |
206 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
207 | if (IS_ERR(priv->mm)) { | |
208 | int err = PTR_ERR(priv->mm); | |
209 | ||
210 | seq_release_private(inode, file); | |
211 | return err; | |
212 | } | |
213 | ||
4db7d0ee ON |
214 | return 0; |
215 | } | |
216 | ||
29a40ace ON |
217 | static int proc_map_release(struct inode *inode, struct file *file) |
218 | { | |
219 | struct seq_file *seq = file->private_data; | |
220 | struct proc_maps_private *priv = seq->private; | |
221 | ||
222 | if (priv->mm) | |
223 | mmdrop(priv->mm); | |
224 | ||
225 | return seq_release_private(inode, file); | |
226 | } | |
227 | ||
a6198797 | 228 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 229 | const struct seq_operations *ops) |
a6198797 | 230 | { |
4db7d0ee ON |
231 | return proc_maps_open(inode, file, ops, |
232 | sizeof(struct proc_maps_private)); | |
a6198797 | 233 | } |
e070ad49 | 234 | |
65376df5 JW |
235 | /* |
236 | * Indicate if the VMA is a stack for the given task; for | |
237 | * /proc/PID/maps that is the stack of the main task. | |
238 | */ | |
1240ea0d | 239 | static int is_stack(struct vm_area_struct *vma) |
58cb6548 | 240 | { |
b18cb64e AL |
241 | /* |
242 | * We make no effort to guess what a given thread considers to be | |
243 | * its "stack". It's not even well-defined for programs written | |
244 | * languages like Go. | |
245 | */ | |
246 | return vma->vm_start <= vma->vm_mm->start_stack && | |
247 | vma->vm_end >= vma->vm_mm->start_stack; | |
58cb6548 ON |
248 | } |
249 | ||
493b0e9d DC |
250 | static void show_vma_header_prefix(struct seq_file *m, |
251 | unsigned long start, unsigned long end, | |
252 | vm_flags_t flags, unsigned long long pgoff, | |
253 | dev_t dev, unsigned long ino) | |
254 | { | |
255 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
0e3dc019 AV |
256 | seq_put_hex_ll(m, NULL, start, 8); |
257 | seq_put_hex_ll(m, "-", end, 8); | |
258 | seq_putc(m, ' '); | |
259 | seq_putc(m, flags & VM_READ ? 'r' : '-'); | |
260 | seq_putc(m, flags & VM_WRITE ? 'w' : '-'); | |
261 | seq_putc(m, flags & VM_EXEC ? 'x' : '-'); | |
262 | seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p'); | |
263 | seq_put_hex_ll(m, " ", pgoff, 8); | |
264 | seq_put_hex_ll(m, " ", MAJOR(dev), 2); | |
265 | seq_put_hex_ll(m, ":", MINOR(dev), 2); | |
266 | seq_put_decimal_ull(m, " ", ino); | |
267 | seq_putc(m, ' '); | |
493b0e9d DC |
268 | } |
269 | ||
b7643757 | 270 | static void |
871305bb | 271 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 272 | { |
e070ad49 ML |
273 | struct mm_struct *mm = vma->vm_mm; |
274 | struct file *file = vma->vm_file; | |
ca16d140 | 275 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 276 | unsigned long ino = 0; |
6260a4b0 | 277 | unsigned long long pgoff = 0; |
a09a79f6 | 278 | unsigned long start, end; |
1da177e4 | 279 | dev_t dev = 0; |
b7643757 | 280 | const char *name = NULL; |
1da177e4 LT |
281 | |
282 | if (file) { | |
496ad9aa | 283 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
284 | dev = inode->i_sb->s_dev; |
285 | ino = inode->i_ino; | |
6260a4b0 | 286 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
287 | } |
288 | ||
d7824370 | 289 | start = vma->vm_start; |
a09a79f6 | 290 | end = vma->vm_end; |
493b0e9d | 291 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
1da177e4 LT |
292 | |
293 | /* | |
294 | * Print the dentry name for named mappings, and a | |
295 | * special [heap] marker for the heap: | |
296 | */ | |
e070ad49 | 297 | if (file) { |
652586df | 298 | seq_pad(m, ' '); |
2726d566 | 299 | seq_file_path(m, file, "\n"); |
b7643757 SP |
300 | goto done; |
301 | } | |
302 | ||
78d683e8 AL |
303 | if (vma->vm_ops && vma->vm_ops->name) { |
304 | name = vma->vm_ops->name(vma); | |
305 | if (name) | |
306 | goto done; | |
307 | } | |
308 | ||
b7643757 SP |
309 | name = arch_vma_name(vma); |
310 | if (!name) { | |
b7643757 SP |
311 | if (!mm) { |
312 | name = "[vdso]"; | |
313 | goto done; | |
314 | } | |
315 | ||
316 | if (vma->vm_start <= mm->brk && | |
317 | vma->vm_end >= mm->start_brk) { | |
318 | name = "[heap]"; | |
319 | goto done; | |
320 | } | |
321 | ||
1240ea0d | 322 | if (is_stack(vma)) |
65376df5 | 323 | name = "[stack]"; |
b7643757 SP |
324 | } |
325 | ||
326 | done: | |
327 | if (name) { | |
652586df | 328 | seq_pad(m, ' '); |
b7643757 | 329 | seq_puts(m, name); |
1da177e4 LT |
330 | } |
331 | seq_putc(m, '\n'); | |
7c88db0c JK |
332 | } |
333 | ||
871305bb | 334 | static int show_map(struct seq_file *m, void *v) |
7c88db0c | 335 | { |
871305bb | 336 | show_map_vma(m, v); |
1da177e4 LT |
337 | return 0; |
338 | } | |
339 | ||
03a44825 | 340 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
341 | .start = m_start, |
342 | .next = m_next, | |
343 | .stop = m_stop, | |
871305bb | 344 | .show = show_map |
a6198797 MM |
345 | }; |
346 | ||
b7643757 | 347 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
348 | { |
349 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
350 | } | |
351 | ||
b7643757 SP |
352 | const struct file_operations proc_pid_maps_operations = { |
353 | .open = pid_maps_open, | |
354 | .read = seq_read, | |
355 | .llseek = seq_lseek, | |
29a40ace | 356 | .release = proc_map_release, |
b7643757 SP |
357 | }; |
358 | ||
a6198797 MM |
359 | /* |
360 | * Proportional Set Size(PSS): my share of RSS. | |
361 | * | |
362 | * PSS of a process is the count of pages it has in memory, where each | |
363 | * page is divided by the number of processes sharing it. So if a | |
364 | * process has 1000 pages all to itself, and 1000 shared with one other | |
365 | * process, its PSS will be 1500. | |
366 | * | |
367 | * To keep (accumulated) division errors low, we adopt a 64bit | |
368 | * fixed-point pss counter to minimize division errors. So (pss >> | |
369 | * PSS_SHIFT) would be the real byte count. | |
370 | * | |
371 | * A shift of 12 before division means (assuming 4K page size): | |
372 | * - 1M 3-user-pages add up to 8KB errors; | |
373 | * - supports mapcount up to 2^24, or 16M; | |
374 | * - supports PSS up to 2^52 bytes, or 4PB. | |
375 | */ | |
376 | #define PSS_SHIFT 12 | |
377 | ||
1e883281 | 378 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 379 | struct mem_size_stats { |
a6198797 MM |
380 | unsigned long resident; |
381 | unsigned long shared_clean; | |
382 | unsigned long shared_dirty; | |
383 | unsigned long private_clean; | |
384 | unsigned long private_dirty; | |
385 | unsigned long referenced; | |
b40d4f84 | 386 | unsigned long anonymous; |
cf8496ea | 387 | unsigned long lazyfree; |
4031a219 | 388 | unsigned long anonymous_thp; |
65c45377 | 389 | unsigned long shmem_thp; |
60fbf0ab | 390 | unsigned long file_thp; |
214e471f | 391 | unsigned long swap; |
25ee01a2 NH |
392 | unsigned long shared_hugetlb; |
393 | unsigned long private_hugetlb; | |
a6198797 | 394 | u64 pss; |
ee2ad71b LS |
395 | u64 pss_anon; |
396 | u64 pss_file; | |
397 | u64 pss_shmem; | |
493b0e9d | 398 | u64 pss_locked; |
8334b962 | 399 | u64 swap_pss; |
c261e7d9 | 400 | bool check_shmem_swap; |
a6198797 MM |
401 | }; |
402 | ||
ee2ad71b LS |
403 | static void smaps_page_accumulate(struct mem_size_stats *mss, |
404 | struct page *page, unsigned long size, unsigned long pss, | |
405 | bool dirty, bool locked, bool private) | |
406 | { | |
407 | mss->pss += pss; | |
408 | ||
409 | if (PageAnon(page)) | |
410 | mss->pss_anon += pss; | |
411 | else if (PageSwapBacked(page)) | |
412 | mss->pss_shmem += pss; | |
413 | else | |
414 | mss->pss_file += pss; | |
415 | ||
416 | if (locked) | |
417 | mss->pss_locked += pss; | |
418 | ||
419 | if (dirty || PageDirty(page)) { | |
420 | if (private) | |
421 | mss->private_dirty += size; | |
422 | else | |
423 | mss->shared_dirty += size; | |
424 | } else { | |
425 | if (private) | |
426 | mss->private_clean += size; | |
427 | else | |
428 | mss->shared_clean += size; | |
429 | } | |
430 | } | |
431 | ||
c164e038 | 432 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
27dd768e | 433 | bool compound, bool young, bool dirty, bool locked) |
c164e038 | 434 | { |
d8c6546b | 435 | int i, nr = compound ? compound_nr(page) : 1; |
afd9883f | 436 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 437 | |
ee2ad71b LS |
438 | /* |
439 | * First accumulate quantities that depend only on |size| and the type | |
440 | * of the compound page. | |
441 | */ | |
cf8496ea | 442 | if (PageAnon(page)) { |
c164e038 | 443 | mss->anonymous += size; |
cf8496ea SL |
444 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
445 | mss->lazyfree += size; | |
446 | } | |
c164e038 KS |
447 | |
448 | mss->resident += size; | |
449 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 450 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 451 | mss->referenced += size; |
c164e038 | 452 | |
afd9883f | 453 | /* |
ee2ad71b LS |
454 | * Then accumulate quantities that may depend on sharing, or that may |
455 | * differ page-by-page. | |
456 | * | |
afd9883f KS |
457 | * page_count(page) == 1 guarantees the page is mapped exactly once. |
458 | * If any subpage of the compound page mapped with PTE it would elevate | |
459 | * page_count(). | |
460 | */ | |
461 | if (page_count(page) == 1) { | |
ee2ad71b LS |
462 | smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty, |
463 | locked, true); | |
afd9883f KS |
464 | return; |
465 | } | |
afd9883f KS |
466 | for (i = 0; i < nr; i++, page++) { |
467 | int mapcount = page_mapcount(page); | |
ee2ad71b LS |
468 | unsigned long pss = PAGE_SIZE << PSS_SHIFT; |
469 | if (mapcount >= 2) | |
470 | pss /= mapcount; | |
471 | smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked, | |
472 | mapcount < 2); | |
c164e038 KS |
473 | } |
474 | } | |
ae11c4d9 | 475 | |
c261e7d9 | 476 | #ifdef CONFIG_SHMEM |
c261e7d9 | 477 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
b7a16c7a | 478 | __always_unused int depth, struct mm_walk *walk) |
c261e7d9 VB |
479 | { |
480 | struct mem_size_stats *mss = walk->private; | |
481 | ||
48131e03 VB |
482 | mss->swap += shmem_partial_swap_usage( |
483 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
484 | |
485 | return 0; | |
486 | } | |
7b86ac33 CH |
487 | #else |
488 | #define smaps_pte_hole NULL | |
489 | #endif /* CONFIG_SHMEM */ | |
c261e7d9 | 490 | |
c164e038 KS |
491 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
492 | struct mm_walk *walk) | |
ae11c4d9 DH |
493 | { |
494 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 495 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 496 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
b1d4d9e0 | 497 | struct page *page = NULL; |
ae11c4d9 | 498 | |
c164e038 KS |
499 | if (pte_present(*pte)) { |
500 | page = vm_normal_page(vma, addr, *pte); | |
501 | } else if (is_swap_pte(*pte)) { | |
502 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 503 | |
8334b962 MK |
504 | if (!non_swap_entry(swpent)) { |
505 | int mapcount; | |
506 | ||
c164e038 | 507 | mss->swap += PAGE_SIZE; |
8334b962 MK |
508 | mapcount = swp_swapcount(swpent); |
509 | if (mapcount >= 2) { | |
510 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
511 | ||
512 | do_div(pss_delta, mapcount); | |
513 | mss->swap_pss += pss_delta; | |
514 | } else { | |
515 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
516 | } | |
517 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 518 | page = migration_entry_to_page(swpent); |
5042db43 JG |
519 | else if (is_device_private_entry(swpent)) |
520 | page = device_private_entry_to_page(swpent); | |
c261e7d9 VB |
521 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
522 | && pte_none(*pte))) { | |
48131e03 VB |
523 | page = find_get_entry(vma->vm_file->f_mapping, |
524 | linear_page_index(vma, addr)); | |
525 | if (!page) | |
526 | return; | |
527 | ||
3159f943 | 528 | if (xa_is_value(page)) |
48131e03 VB |
529 | mss->swap += PAGE_SIZE; |
530 | else | |
09cbfeaf | 531 | put_page(page); |
48131e03 VB |
532 | |
533 | return; | |
b1d4d9e0 | 534 | } |
ae11c4d9 | 535 | |
ae11c4d9 DH |
536 | if (!page) |
537 | return; | |
afd9883f | 538 | |
27dd768e | 539 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), locked); |
ae11c4d9 DH |
540 | } |
541 | ||
c164e038 KS |
542 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
543 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
544 | struct mm_walk *walk) | |
545 | { | |
546 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 547 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 548 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
c94b6923 HY |
549 | struct page *page = NULL; |
550 | ||
551 | if (pmd_present(*pmd)) { | |
552 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
553 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
554 | } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) { | |
555 | swp_entry_t entry = pmd_to_swp_entry(*pmd); | |
c164e038 | 556 | |
c94b6923 HY |
557 | if (is_migration_entry(entry)) |
558 | page = migration_entry_to_page(entry); | |
559 | } | |
c164e038 KS |
560 | if (IS_ERR_OR_NULL(page)) |
561 | return; | |
65c45377 KS |
562 | if (PageAnon(page)) |
563 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
564 | else if (PageSwapBacked(page)) | |
565 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
566 | else if (is_zone_device_page(page)) |
567 | /* pass */; | |
65c45377 | 568 | else |
60fbf0ab | 569 | mss->file_thp += HPAGE_PMD_SIZE; |
27dd768e | 570 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), locked); |
c164e038 KS |
571 | } |
572 | #else | |
573 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
574 | struct mm_walk *walk) | |
575 | { | |
576 | } | |
577 | #endif | |
578 | ||
b3ae5acb | 579 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 580 | struct mm_walk *walk) |
e070ad49 | 581 | { |
14eb6fdd | 582 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 583 | pte_t *pte; |
705e87c0 | 584 | spinlock_t *ptl; |
e070ad49 | 585 | |
b6ec57f4 KS |
586 | ptl = pmd_trans_huge_lock(pmd, vma); |
587 | if (ptl) { | |
c94b6923 | 588 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 589 | spin_unlock(ptl); |
14038302 | 590 | goto out; |
22e057c5 | 591 | } |
1a5a9906 AA |
592 | |
593 | if (pmd_trans_unstable(pmd)) | |
14038302 | 594 | goto out; |
22e057c5 DH |
595 | /* |
596 | * The mmap_sem held all the way back in m_start() is what | |
597 | * keeps khugepaged out of here and from collapsing things | |
598 | * in here. | |
599 | */ | |
705e87c0 | 600 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 601 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 602 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 603 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 604 | out: |
705e87c0 | 605 | cond_resched(); |
b3ae5acb | 606 | return 0; |
e070ad49 ML |
607 | } |
608 | ||
834f82e2 CG |
609 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
610 | { | |
611 | /* | |
612 | * Don't forget to update Documentation/ on changes. | |
613 | */ | |
614 | static const char mnemonics[BITS_PER_LONG][2] = { | |
615 | /* | |
616 | * In case if we meet a flag we don't know about. | |
617 | */ | |
618 | [0 ... (BITS_PER_LONG-1)] = "??", | |
619 | ||
620 | [ilog2(VM_READ)] = "rd", | |
621 | [ilog2(VM_WRITE)] = "wr", | |
622 | [ilog2(VM_EXEC)] = "ex", | |
623 | [ilog2(VM_SHARED)] = "sh", | |
624 | [ilog2(VM_MAYREAD)] = "mr", | |
625 | [ilog2(VM_MAYWRITE)] = "mw", | |
626 | [ilog2(VM_MAYEXEC)] = "me", | |
627 | [ilog2(VM_MAYSHARE)] = "ms", | |
628 | [ilog2(VM_GROWSDOWN)] = "gd", | |
629 | [ilog2(VM_PFNMAP)] = "pf", | |
630 | [ilog2(VM_DENYWRITE)] = "dw", | |
631 | [ilog2(VM_LOCKED)] = "lo", | |
632 | [ilog2(VM_IO)] = "io", | |
633 | [ilog2(VM_SEQ_READ)] = "sr", | |
634 | [ilog2(VM_RAND_READ)] = "rr", | |
635 | [ilog2(VM_DONTCOPY)] = "dc", | |
636 | [ilog2(VM_DONTEXPAND)] = "de", | |
637 | [ilog2(VM_ACCOUNT)] = "ac", | |
638 | [ilog2(VM_NORESERVE)] = "nr", | |
639 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 640 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 641 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 642 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 643 | [ilog2(VM_DONTDUMP)] = "dd", |
424037b7 DK |
644 | #ifdef CONFIG_ARM64_BTI |
645 | [ilog2(VM_ARM64_BTI)] = "bt", | |
646 | #endif | |
ec8e41ae NH |
647 | #ifdef CONFIG_MEM_SOFT_DIRTY |
648 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
649 | #endif | |
834f82e2 CG |
650 | [ilog2(VM_MIXEDMAP)] = "mm", |
651 | [ilog2(VM_HUGEPAGE)] = "hg", | |
652 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
653 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
654 | [ilog2(VM_UFFD_MISSING)]= "um", |
655 | [ilog2(VM_UFFD_WP)] = "uw", | |
5212213a | 656 | #ifdef CONFIG_ARCH_HAS_PKEYS |
c1192f84 DH |
657 | /* These come out via ProtectionKey: */ |
658 | [ilog2(VM_PKEY_BIT0)] = "", | |
659 | [ilog2(VM_PKEY_BIT1)] = "", | |
660 | [ilog2(VM_PKEY_BIT2)] = "", | |
661 | [ilog2(VM_PKEY_BIT3)] = "", | |
2c9e0a6f RP |
662 | #if VM_PKEY_BIT4 |
663 | [ilog2(VM_PKEY_BIT4)] = "", | |
c1192f84 | 664 | #endif |
5212213a | 665 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
834f82e2 CG |
666 | }; |
667 | size_t i; | |
668 | ||
669 | seq_puts(m, "VmFlags: "); | |
670 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
671 | if (!mnemonics[i][0]) |
672 | continue; | |
834f82e2 | 673 | if (vma->vm_flags & (1UL << i)) { |
f6640663 AV |
674 | seq_putc(m, mnemonics[i][0]); |
675 | seq_putc(m, mnemonics[i][1]); | |
676 | seq_putc(m, ' '); | |
834f82e2 CG |
677 | } |
678 | } | |
679 | seq_putc(m, '\n'); | |
680 | } | |
681 | ||
25ee01a2 NH |
682 | #ifdef CONFIG_HUGETLB_PAGE |
683 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
684 | unsigned long addr, unsigned long end, | |
685 | struct mm_walk *walk) | |
686 | { | |
687 | struct mem_size_stats *mss = walk->private; | |
688 | struct vm_area_struct *vma = walk->vma; | |
689 | struct page *page = NULL; | |
690 | ||
691 | if (pte_present(*pte)) { | |
692 | page = vm_normal_page(vma, addr, *pte); | |
693 | } else if (is_swap_pte(*pte)) { | |
694 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
695 | ||
696 | if (is_migration_entry(swpent)) | |
697 | page = migration_entry_to_page(swpent); | |
5042db43 JG |
698 | else if (is_device_private_entry(swpent)) |
699 | page = device_private_entry_to_page(swpent); | |
25ee01a2 NH |
700 | } |
701 | if (page) { | |
702 | int mapcount = page_mapcount(page); | |
703 | ||
704 | if (mapcount >= 2) | |
705 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
706 | else | |
707 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
708 | } | |
709 | return 0; | |
710 | } | |
7b86ac33 CH |
711 | #else |
712 | #define smaps_hugetlb_range NULL | |
25ee01a2 NH |
713 | #endif /* HUGETLB_PAGE */ |
714 | ||
7b86ac33 CH |
715 | static const struct mm_walk_ops smaps_walk_ops = { |
716 | .pmd_entry = smaps_pte_range, | |
717 | .hugetlb_entry = smaps_hugetlb_range, | |
718 | }; | |
719 | ||
720 | static const struct mm_walk_ops smaps_shmem_walk_ops = { | |
721 | .pmd_entry = smaps_pte_range, | |
722 | .hugetlb_entry = smaps_hugetlb_range, | |
723 | .pte_hole = smaps_pte_hole, | |
724 | }; | |
725 | ||
8e68d689 VB |
726 | static void smap_gather_stats(struct vm_area_struct *vma, |
727 | struct mem_size_stats *mss) | |
e070ad49 | 728 | { |
c261e7d9 | 729 | #ifdef CONFIG_SHMEM |
fa76da46 VB |
730 | /* In case of smaps_rollup, reset the value from previous vma */ |
731 | mss->check_shmem_swap = false; | |
c261e7d9 | 732 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
6a15a370 VB |
733 | /* |
734 | * For shared or readonly shmem mappings we know that all | |
735 | * swapped out pages belong to the shmem object, and we can | |
736 | * obtain the swap value much more efficiently. For private | |
737 | * writable mappings, we might have COW pages that are | |
738 | * not affected by the parent swapped out pages of the shmem | |
739 | * object, so we have to distinguish them during the page walk. | |
740 | * Unless we know that the shmem object (or the part mapped by | |
741 | * our VMA) has no swapped out pages at all. | |
742 | */ | |
743 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
744 | ||
745 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
746 | !(vma->vm_flags & VM_WRITE)) { | |
fa76da46 | 747 | mss->swap += shmem_swapped; |
6a15a370 | 748 | } else { |
493b0e9d | 749 | mss->check_shmem_swap = true; |
7b86ac33 CH |
750 | walk_page_vma(vma, &smaps_shmem_walk_ops, mss); |
751 | return; | |
6a15a370 | 752 | } |
c261e7d9 VB |
753 | } |
754 | #endif | |
d82ef020 | 755 | /* mmap_sem is held in m_start */ |
7b86ac33 | 756 | walk_page_vma(vma, &smaps_walk_ops, mss); |
8e68d689 VB |
757 | } |
758 | ||
759 | #define SEQ_PUT_DEC(str, val) \ | |
760 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) | |
f1547959 VB |
761 | |
762 | /* Show the contents common for smaps and smaps_rollup */ | |
ee2ad71b LS |
763 | static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss, |
764 | bool rollup_mode) | |
f1547959 VB |
765 | { |
766 | SEQ_PUT_DEC("Rss: ", mss->resident); | |
767 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); | |
ee2ad71b LS |
768 | if (rollup_mode) { |
769 | /* | |
770 | * These are meaningful only for smaps_rollup, otherwise two of | |
771 | * them are zero, and the other one is the same as Pss. | |
772 | */ | |
773 | SEQ_PUT_DEC(" kB\nPss_Anon: ", | |
774 | mss->pss_anon >> PSS_SHIFT); | |
775 | SEQ_PUT_DEC(" kB\nPss_File: ", | |
776 | mss->pss_file >> PSS_SHIFT); | |
777 | SEQ_PUT_DEC(" kB\nPss_Shmem: ", | |
778 | mss->pss_shmem >> PSS_SHIFT); | |
779 | } | |
f1547959 VB |
780 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); |
781 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); | |
782 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); | |
783 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); | |
784 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); | |
785 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); | |
786 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); | |
787 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); | |
788 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); | |
60fbf0ab | 789 | SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss->file_thp); |
f1547959 VB |
790 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); |
791 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", | |
792 | mss->private_hugetlb >> 10, 7); | |
793 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); | |
794 | SEQ_PUT_DEC(" kB\nSwapPss: ", | |
795 | mss->swap_pss >> PSS_SHIFT); | |
796 | SEQ_PUT_DEC(" kB\nLocked: ", | |
797 | mss->pss_locked >> PSS_SHIFT); | |
798 | seq_puts(m, " kB\n"); | |
799 | } | |
800 | ||
8e68d689 VB |
801 | static int show_smap(struct seq_file *m, void *v) |
802 | { | |
8e68d689 | 803 | struct vm_area_struct *vma = v; |
258f669e VB |
804 | struct mem_size_stats mss; |
805 | ||
806 | memset(&mss, 0, sizeof(mss)); | |
807 | ||
808 | smap_gather_stats(vma, &mss); | |
809 | ||
810 | show_map_vma(m, vma); | |
811 | ||
812 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); | |
813 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); | |
814 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); | |
815 | seq_puts(m, " kB\n"); | |
816 | ||
ee2ad71b | 817 | __show_smap(m, &mss, false); |
258f669e | 818 | |
c0630669 YS |
819 | seq_printf(m, "THPeligible: %d\n", |
820 | transparent_hugepage_enabled(vma)); | |
7635d9cb | 821 | |
258f669e VB |
822 | if (arch_pkeys_enabled()) |
823 | seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); | |
824 | show_smap_vma_flags(m, vma); | |
825 | ||
258f669e VB |
826 | return 0; |
827 | } | |
828 | ||
829 | static int show_smaps_rollup(struct seq_file *m, void *v) | |
830 | { | |
831 | struct proc_maps_private *priv = m->private; | |
832 | struct mem_size_stats mss; | |
833 | struct mm_struct *mm; | |
834 | struct vm_area_struct *vma; | |
835 | unsigned long last_vma_end = 0; | |
8e68d689 | 836 | int ret = 0; |
8e68d689 | 837 | |
258f669e VB |
838 | priv->task = get_proc_task(priv->inode); |
839 | if (!priv->task) | |
840 | return -ESRCH; | |
493b0e9d | 841 | |
258f669e VB |
842 | mm = priv->mm; |
843 | if (!mm || !mmget_not_zero(mm)) { | |
844 | ret = -ESRCH; | |
845 | goto out_put_task; | |
493b0e9d | 846 | } |
4752c369 | 847 | |
258f669e | 848 | memset(&mss, 0, sizeof(mss)); |
493b0e9d | 849 | |
d8ed45c5 | 850 | ret = mmap_read_lock_killable(mm); |
a26a9781 KK |
851 | if (ret) |
852 | goto out_put_mm; | |
853 | ||
258f669e | 854 | hold_task_mempolicy(priv); |
f1547959 | 855 | |
258f669e VB |
856 | for (vma = priv->mm->mmap; vma; vma = vma->vm_next) { |
857 | smap_gather_stats(vma, &mss); | |
858 | last_vma_end = vma->vm_end; | |
493b0e9d | 859 | } |
258f669e VB |
860 | |
861 | show_vma_header_prefix(m, priv->mm->mmap->vm_start, | |
862 | last_vma_end, 0, 0, 0, 0); | |
863 | seq_pad(m, ' '); | |
864 | seq_puts(m, "[rollup]\n"); | |
865 | ||
ee2ad71b | 866 | __show_smap(m, &mss, true); |
258f669e VB |
867 | |
868 | release_task_mempolicy(priv); | |
d8ed45c5 | 869 | mmap_read_unlock(mm); |
258f669e | 870 | |
a26a9781 KK |
871 | out_put_mm: |
872 | mmput(mm); | |
258f669e VB |
873 | out_put_task: |
874 | put_task_struct(priv->task); | |
875 | priv->task = NULL; | |
876 | ||
493b0e9d | 877 | return ret; |
e070ad49 | 878 | } |
d1be35cb | 879 | #undef SEQ_PUT_DEC |
e070ad49 | 880 | |
03a44825 | 881 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
882 | .start = m_start, |
883 | .next = m_next, | |
884 | .stop = m_stop, | |
871305bb | 885 | .show = show_smap |
a6198797 MM |
886 | }; |
887 | ||
b7643757 | 888 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
889 | { |
890 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
891 | } | |
892 | ||
258f669e | 893 | static int smaps_rollup_open(struct inode *inode, struct file *file) |
493b0e9d | 894 | { |
258f669e | 895 | int ret; |
493b0e9d | 896 | struct proc_maps_private *priv; |
258f669e VB |
897 | |
898 | priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); | |
899 | if (!priv) | |
493b0e9d | 900 | return -ENOMEM; |
258f669e VB |
901 | |
902 | ret = single_open(file, show_smaps_rollup, priv); | |
903 | if (ret) | |
904 | goto out_free; | |
905 | ||
906 | priv->inode = inode; | |
907 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); | |
908 | if (IS_ERR(priv->mm)) { | |
909 | ret = PTR_ERR(priv->mm); | |
910 | ||
911 | single_release(inode, file); | |
912 | goto out_free; | |
493b0e9d | 913 | } |
258f669e | 914 | |
493b0e9d | 915 | return 0; |
258f669e VB |
916 | |
917 | out_free: | |
918 | kfree(priv); | |
919 | return ret; | |
920 | } | |
921 | ||
922 | static int smaps_rollup_release(struct inode *inode, struct file *file) | |
923 | { | |
924 | struct seq_file *seq = file->private_data; | |
925 | struct proc_maps_private *priv = seq->private; | |
926 | ||
927 | if (priv->mm) | |
928 | mmdrop(priv->mm); | |
929 | ||
930 | kfree(priv); | |
931 | return single_release(inode, file); | |
493b0e9d DC |
932 | } |
933 | ||
b7643757 SP |
934 | const struct file_operations proc_pid_smaps_operations = { |
935 | .open = pid_smaps_open, | |
936 | .read = seq_read, | |
937 | .llseek = seq_lseek, | |
29a40ace | 938 | .release = proc_map_release, |
b7643757 SP |
939 | }; |
940 | ||
493b0e9d | 941 | const struct file_operations proc_pid_smaps_rollup_operations = { |
258f669e | 942 | .open = smaps_rollup_open, |
493b0e9d DC |
943 | .read = seq_read, |
944 | .llseek = seq_lseek, | |
258f669e | 945 | .release = smaps_rollup_release, |
493b0e9d DC |
946 | }; |
947 | ||
040fa020 PE |
948 | enum clear_refs_types { |
949 | CLEAR_REFS_ALL = 1, | |
950 | CLEAR_REFS_ANON, | |
951 | CLEAR_REFS_MAPPED, | |
0f8975ec | 952 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 953 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
954 | CLEAR_REFS_LAST, |
955 | }; | |
956 | ||
af9de7eb | 957 | struct clear_refs_private { |
0f8975ec | 958 | enum clear_refs_types type; |
af9de7eb PE |
959 | }; |
960 | ||
7d5b3bfa | 961 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
962 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
963 | unsigned long addr, pte_t *pte) | |
964 | { | |
0f8975ec PE |
965 | /* |
966 | * The soft-dirty tracker uses #PF-s to catch writes | |
967 | * to pages, so write-protect the pte as well. See the | |
1ad1335d | 968 | * Documentation/admin-guide/mm/soft-dirty.rst for full description |
0f8975ec PE |
969 | * of how soft-dirty works. |
970 | */ | |
971 | pte_t ptent = *pte; | |
179ef71c CG |
972 | |
973 | if (pte_present(ptent)) { | |
04a86453 AK |
974 | pte_t old_pte; |
975 | ||
976 | old_pte = ptep_modify_prot_start(vma, addr, pte); | |
977 | ptent = pte_wrprotect(old_pte); | |
a7b76174 | 978 | ptent = pte_clear_soft_dirty(ptent); |
04a86453 | 979 | ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent); |
179ef71c CG |
980 | } else if (is_swap_pte(ptent)) { |
981 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 982 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 983 | } |
0f8975ec | 984 | } |
5d3875a0 LD |
985 | #else |
986 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
987 | unsigned long addr, pte_t *pte) | |
988 | { | |
989 | } | |
990 | #endif | |
0f8975ec | 991 | |
5d3875a0 | 992 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
993 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
994 | unsigned long addr, pmd_t *pmdp) | |
995 | { | |
a3cf988f | 996 | pmd_t old, pmd = *pmdp; |
5b7abeae | 997 | |
ab6e3d09 NH |
998 | if (pmd_present(pmd)) { |
999 | /* See comment in change_huge_pmd() */ | |
a3cf988f KS |
1000 | old = pmdp_invalidate(vma, addr, pmdp); |
1001 | if (pmd_dirty(old)) | |
ab6e3d09 | 1002 | pmd = pmd_mkdirty(pmd); |
a3cf988f | 1003 | if (pmd_young(old)) |
ab6e3d09 NH |
1004 | pmd = pmd_mkyoung(pmd); |
1005 | ||
1006 | pmd = pmd_wrprotect(pmd); | |
1007 | pmd = pmd_clear_soft_dirty(pmd); | |
1008 | ||
1009 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1010 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
1011 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
1012 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1013 | } | |
7d5b3bfa | 1014 | } |
7d5b3bfa | 1015 | #else |
7d5b3bfa KS |
1016 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1017 | unsigned long addr, pmd_t *pmdp) | |
1018 | { | |
1019 | } | |
1020 | #endif | |
1021 | ||
a6198797 | 1022 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1023 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1024 | { |
af9de7eb | 1025 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1026 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1027 | pte_t *pte, ptent; |
1028 | spinlock_t *ptl; | |
1029 | struct page *page; | |
1030 | ||
b6ec57f4 KS |
1031 | ptl = pmd_trans_huge_lock(pmd, vma); |
1032 | if (ptl) { | |
7d5b3bfa KS |
1033 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1034 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1035 | goto out; | |
1036 | } | |
1037 | ||
84c3fc4e ZY |
1038 | if (!pmd_present(*pmd)) |
1039 | goto out; | |
1040 | ||
7d5b3bfa KS |
1041 | page = pmd_page(*pmd); |
1042 | ||
1043 | /* Clear accessed and referenced bits. */ | |
1044 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1045 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1046 | ClearPageReferenced(page); |
1047 | out: | |
1048 | spin_unlock(ptl); | |
1049 | return 0; | |
1050 | } | |
1051 | ||
1a5a9906 AA |
1052 | if (pmd_trans_unstable(pmd)) |
1053 | return 0; | |
03319327 | 1054 | |
a6198797 MM |
1055 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1056 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1057 | ptent = *pte; | |
a6198797 | 1058 | |
0f8975ec PE |
1059 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1060 | clear_soft_dirty(vma, addr, pte); | |
1061 | continue; | |
1062 | } | |
1063 | ||
179ef71c CG |
1064 | if (!pte_present(ptent)) |
1065 | continue; | |
1066 | ||
a6198797 MM |
1067 | page = vm_normal_page(vma, addr, ptent); |
1068 | if (!page) | |
1069 | continue; | |
1070 | ||
1071 | /* Clear accessed and referenced bits. */ | |
1072 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1073 | test_and_clear_page_young(page); |
a6198797 MM |
1074 | ClearPageReferenced(page); |
1075 | } | |
1076 | pte_unmap_unlock(pte - 1, ptl); | |
1077 | cond_resched(); | |
1078 | return 0; | |
1079 | } | |
1080 | ||
5c64f52a NH |
1081 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1082 | struct mm_walk *walk) | |
1083 | { | |
1084 | struct clear_refs_private *cp = walk->private; | |
1085 | struct vm_area_struct *vma = walk->vma; | |
1086 | ||
48684a65 NH |
1087 | if (vma->vm_flags & VM_PFNMAP) |
1088 | return 1; | |
1089 | ||
5c64f52a NH |
1090 | /* |
1091 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1092 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1093 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1094 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1095 | */ | |
1096 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1097 | return 1; | |
1098 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1099 | return 1; | |
1100 | return 0; | |
1101 | } | |
1102 | ||
7b86ac33 CH |
1103 | static const struct mm_walk_ops clear_refs_walk_ops = { |
1104 | .pmd_entry = clear_refs_pte_range, | |
1105 | .test_walk = clear_refs_test_walk, | |
1106 | }; | |
1107 | ||
f248dcb3 MM |
1108 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1109 | size_t count, loff_t *ppos) | |
b813e931 | 1110 | { |
f248dcb3 | 1111 | struct task_struct *task; |
fb92a4b0 | 1112 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1113 | struct mm_struct *mm; |
b813e931 | 1114 | struct vm_area_struct *vma; |
040fa020 | 1115 | enum clear_refs_types type; |
b3a81d08 | 1116 | struct mmu_gather tlb; |
040fa020 | 1117 | int itype; |
0a8cb8e3 | 1118 | int rv; |
b813e931 | 1119 | |
f248dcb3 MM |
1120 | memset(buffer, 0, sizeof(buffer)); |
1121 | if (count > sizeof(buffer) - 1) | |
1122 | count = sizeof(buffer) - 1; | |
1123 | if (copy_from_user(buffer, buf, count)) | |
1124 | return -EFAULT; | |
040fa020 | 1125 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1126 | if (rv < 0) |
1127 | return rv; | |
040fa020 PE |
1128 | type = (enum clear_refs_types)itype; |
1129 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1130 | return -EINVAL; |
541c237c | 1131 | |
496ad9aa | 1132 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1133 | if (!task) |
1134 | return -ESRCH; | |
1135 | mm = get_task_mm(task); | |
1136 | if (mm) { | |
ac46d4f3 | 1137 | struct mmu_notifier_range range; |
af9de7eb | 1138 | struct clear_refs_private cp = { |
0f8975ec | 1139 | .type = type, |
af9de7eb | 1140 | }; |
695f0559 PC |
1141 | |
1142 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
d8ed45c5 | 1143 | if (mmap_write_lock_killable(mm)) { |
4e80153a MH |
1144 | count = -EINTR; |
1145 | goto out_mm; | |
1146 | } | |
1147 | ||
695f0559 PC |
1148 | /* |
1149 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1150 | * resident set size to this mm's current rss value. | |
1151 | */ | |
695f0559 | 1152 | reset_mm_hiwater_rss(mm); |
d8ed45c5 | 1153 | mmap_write_unlock(mm); |
695f0559 PC |
1154 | goto out_mm; |
1155 | } | |
1156 | ||
d8ed45c5 | 1157 | if (mmap_read_lock_killable(mm)) { |
c4603801 KK |
1158 | count = -EINTR; |
1159 | goto out_mm; | |
1160 | } | |
b3a81d08 | 1161 | tlb_gather_mmu(&tlb, mm, 0, -1); |
64e45507 PF |
1162 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1163 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1164 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1165 | continue; | |
d8ed45c5 ML |
1166 | mmap_read_unlock(mm); |
1167 | if (mmap_write_lock_killable(mm)) { | |
4e80153a MH |
1168 | count = -EINTR; |
1169 | goto out_mm; | |
1170 | } | |
04f5866e AA |
1171 | /* |
1172 | * Avoid to modify vma->vm_flags | |
1173 | * without locked ops while the | |
1174 | * coredump reads the vm_flags. | |
1175 | */ | |
1176 | if (!mmget_still_valid(mm)) { | |
1177 | /* | |
1178 | * Silently return "count" | |
1179 | * like if get_task_mm() | |
1180 | * failed. FIXME: should this | |
1181 | * function have returned | |
1182 | * -ESRCH if get_task_mm() | |
1183 | * failed like if | |
1184 | * get_proc_task() fails? | |
1185 | */ | |
d8ed45c5 | 1186 | mmap_write_unlock(mm); |
04f5866e AA |
1187 | goto out_mm; |
1188 | } | |
64e45507 PF |
1189 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1190 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1191 | vma_set_page_prot(vma); | |
1192 | } | |
d8ed45c5 | 1193 | mmap_write_downgrade(mm); |
64e45507 PF |
1194 | break; |
1195 | } | |
ac46d4f3 | 1196 | |
7269f999 JG |
1197 | mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY, |
1198 | 0, NULL, mm, 0, -1UL); | |
ac46d4f3 | 1199 | mmu_notifier_invalidate_range_start(&range); |
64e45507 | 1200 | } |
7b86ac33 CH |
1201 | walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops, |
1202 | &cp); | |
0f8975ec | 1203 | if (type == CLEAR_REFS_SOFT_DIRTY) |
ac46d4f3 | 1204 | mmu_notifier_invalidate_range_end(&range); |
b3a81d08 | 1205 | tlb_finish_mmu(&tlb, 0, -1); |
d8ed45c5 | 1206 | mmap_read_unlock(mm); |
695f0559 | 1207 | out_mm: |
f248dcb3 MM |
1208 | mmput(mm); |
1209 | } | |
1210 | put_task_struct(task); | |
fb92a4b0 VL |
1211 | |
1212 | return count; | |
b813e931 DR |
1213 | } |
1214 | ||
f248dcb3 MM |
1215 | const struct file_operations proc_clear_refs_operations = { |
1216 | .write = clear_refs_write, | |
6038f373 | 1217 | .llseek = noop_llseek, |
f248dcb3 MM |
1218 | }; |
1219 | ||
092b50ba NH |
1220 | typedef struct { |
1221 | u64 pme; | |
1222 | } pagemap_entry_t; | |
1223 | ||
85863e47 | 1224 | struct pagemapread { |
8c829622 | 1225 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1226 | pagemap_entry_t *buffer; |
1c90308e | 1227 | bool show_pfn; |
85863e47 MM |
1228 | }; |
1229 | ||
5aaabe83 NH |
1230 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1231 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1232 | ||
deb94544 KK |
1233 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1234 | #define PM_PFRAME_BITS 55 | |
1235 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1236 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1237 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1238 | #define PM_FILE BIT_ULL(61) |
1239 | #define PM_SWAP BIT_ULL(62) | |
1240 | #define PM_PRESENT BIT_ULL(63) | |
1241 | ||
85863e47 MM |
1242 | #define PM_END_OF_BUFFER 1 |
1243 | ||
deb94544 | 1244 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1245 | { |
deb94544 | 1246 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1247 | } |
1248 | ||
1249 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1250 | struct pagemapread *pm) |
1251 | { | |
092b50ba | 1252 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1253 | if (pm->pos >= pm->len) |
aae8679b | 1254 | return PM_END_OF_BUFFER; |
85863e47 MM |
1255 | return 0; |
1256 | } | |
1257 | ||
1258 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
b7a16c7a | 1259 | __always_unused int depth, struct mm_walk *walk) |
85863e47 | 1260 | { |
2165009b | 1261 | struct pagemapread *pm = walk->private; |
68b5a652 | 1262 | unsigned long addr = start; |
85863e47 | 1263 | int err = 0; |
092b50ba | 1264 | |
68b5a652 PF |
1265 | while (addr < end) { |
1266 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1267 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1268 | /* End of address space hole, which we mark as non-present. */ |
1269 | unsigned long hole_end; | |
68b5a652 | 1270 | |
87e6d49a PF |
1271 | if (vma) |
1272 | hole_end = min(end, vma->vm_start); | |
1273 | else | |
1274 | hole_end = end; | |
1275 | ||
1276 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1277 | err = add_to_pagemap(addr, &pme, pm); | |
1278 | if (err) | |
1279 | goto out; | |
68b5a652 PF |
1280 | } |
1281 | ||
87e6d49a PF |
1282 | if (!vma) |
1283 | break; | |
1284 | ||
1285 | /* Addresses in the VMA. */ | |
1286 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1287 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1288 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1289 | err = add_to_pagemap(addr, &pme, pm); |
1290 | if (err) | |
1291 | goto out; | |
1292 | } | |
85863e47 | 1293 | } |
68b5a652 | 1294 | out: |
85863e47 MM |
1295 | return err; |
1296 | } | |
1297 | ||
deb94544 | 1298 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1299 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1300 | { |
deb94544 | 1301 | u64 frame = 0, flags = 0; |
052fb0d6 | 1302 | struct page *page = NULL; |
85863e47 | 1303 | |
052fb0d6 | 1304 | if (pte_present(pte)) { |
1c90308e KK |
1305 | if (pm->show_pfn) |
1306 | frame = pte_pfn(pte); | |
deb94544 | 1307 | flags |= PM_PRESENT; |
25b2995a | 1308 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1309 | if (pte_soft_dirty(pte)) |
deb94544 | 1310 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1311 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1312 | swp_entry_t entry; |
1313 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1314 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1315 | entry = pte_to_swp_entry(pte); |
ab6ecf24 HY |
1316 | if (pm->show_pfn) |
1317 | frame = swp_type(entry) | | |
1318 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1319 | flags |= PM_SWAP; |
052fb0d6 KK |
1320 | if (is_migration_entry(entry)) |
1321 | page = migration_entry_to_page(entry); | |
5042db43 JG |
1322 | |
1323 | if (is_device_private_entry(entry)) | |
1324 | page = device_private_entry_to_page(entry); | |
052fb0d6 KK |
1325 | } |
1326 | ||
1327 | if (page && !PageAnon(page)) | |
1328 | flags |= PM_FILE; | |
77bb499b KK |
1329 | if (page && page_mapcount(page) == 1) |
1330 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1331 | if (vma->vm_flags & VM_SOFTDIRTY) |
1332 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1333 | |
deb94544 | 1334 | return make_pme(frame, flags); |
bcf8039e DH |
1335 | } |
1336 | ||
356515e7 | 1337 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1338 | struct mm_walk *walk) |
85863e47 | 1339 | { |
f995ece2 | 1340 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1341 | struct pagemapread *pm = walk->private; |
bf929152 | 1342 | spinlock_t *ptl; |
05fbf357 | 1343 | pte_t *pte, *orig_pte; |
85863e47 MM |
1344 | int err = 0; |
1345 | ||
356515e7 | 1346 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1347 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1348 | if (ptl) { | |
356515e7 KK |
1349 | u64 flags = 0, frame = 0; |
1350 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1351 | struct page *page = NULL; |
0f8975ec | 1352 | |
b83d7e43 | 1353 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1354 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1355 | |
356515e7 | 1356 | if (pmd_present(pmd)) { |
84c3fc4e | 1357 | page = pmd_page(pmd); |
77bb499b | 1358 | |
356515e7 | 1359 | flags |= PM_PRESENT; |
b83d7e43 HY |
1360 | if (pmd_soft_dirty(pmd)) |
1361 | flags |= PM_SOFT_DIRTY; | |
1c90308e KK |
1362 | if (pm->show_pfn) |
1363 | frame = pmd_pfn(pmd) + | |
1364 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1365 | } |
84c3fc4e ZY |
1366 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1367 | else if (is_swap_pmd(pmd)) { | |
1368 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
ab6ecf24 | 1369 | unsigned long offset; |
84c3fc4e | 1370 | |
ab6ecf24 HY |
1371 | if (pm->show_pfn) { |
1372 | offset = swp_offset(entry) + | |
1373 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
1374 | frame = swp_type(entry) | | |
1375 | (offset << MAX_SWAPFILES_SHIFT); | |
1376 | } | |
84c3fc4e | 1377 | flags |= PM_SWAP; |
b83d7e43 HY |
1378 | if (pmd_swp_soft_dirty(pmd)) |
1379 | flags |= PM_SOFT_DIRTY; | |
84c3fc4e ZY |
1380 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
1381 | page = migration_entry_to_page(entry); | |
1382 | } | |
1383 | #endif | |
1384 | ||
1385 | if (page && page_mapcount(page) == 1) | |
1386 | flags |= PM_MMAP_EXCLUSIVE; | |
356515e7 | 1387 | |
025c5b24 | 1388 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1389 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1390 | |
092b50ba | 1391 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1392 | if (err) |
1393 | break; | |
ab6ecf24 HY |
1394 | if (pm->show_pfn) { |
1395 | if (flags & PM_PRESENT) | |
1396 | frame++; | |
1397 | else if (flags & PM_SWAP) | |
1398 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
1399 | } | |
5aaabe83 | 1400 | } |
bf929152 | 1401 | spin_unlock(ptl); |
025c5b24 | 1402 | return err; |
5aaabe83 NH |
1403 | } |
1404 | ||
356515e7 | 1405 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1406 | return 0; |
356515e7 | 1407 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1408 | |
f995ece2 NH |
1409 | /* |
1410 | * We can assume that @vma always points to a valid one and @end never | |
1411 | * goes beyond vma->vm_end. | |
1412 | */ | |
356515e7 | 1413 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1414 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1415 | pagemap_entry_t pme; | |
05fbf357 | 1416 | |
deb94544 | 1417 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1418 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1419 | if (err) |
81d0fa62 | 1420 | break; |
85863e47 | 1421 | } |
f995ece2 | 1422 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1423 | |
1424 | cond_resched(); | |
1425 | ||
1426 | return err; | |
1427 | } | |
1428 | ||
1a5cb814 | 1429 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1430 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1431 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1432 | unsigned long addr, unsigned long end, |
1433 | struct mm_walk *walk) | |
5dc37642 | 1434 | { |
5dc37642 | 1435 | struct pagemapread *pm = walk->private; |
f995ece2 | 1436 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1437 | u64 flags = 0, frame = 0; |
5dc37642 | 1438 | int err = 0; |
356515e7 | 1439 | pte_t pte; |
5dc37642 | 1440 | |
f995ece2 | 1441 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1442 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1443 | |
356515e7 KK |
1444 | pte = huge_ptep_get(ptep); |
1445 | if (pte_present(pte)) { | |
1446 | struct page *page = pte_page(pte); | |
1447 | ||
1448 | if (!PageAnon(page)) | |
1449 | flags |= PM_FILE; | |
1450 | ||
77bb499b KK |
1451 | if (page_mapcount(page) == 1) |
1452 | flags |= PM_MMAP_EXCLUSIVE; | |
1453 | ||
356515e7 | 1454 | flags |= PM_PRESENT; |
1c90308e KK |
1455 | if (pm->show_pfn) |
1456 | frame = pte_pfn(pte) + | |
1457 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1458 | } |
1459 | ||
5dc37642 | 1460 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1461 | pagemap_entry_t pme = make_pme(frame, flags); |
1462 | ||
092b50ba | 1463 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1464 | if (err) |
1465 | return err; | |
1c90308e | 1466 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1467 | frame++; |
5dc37642 NH |
1468 | } |
1469 | ||
1470 | cond_resched(); | |
1471 | ||
1472 | return err; | |
1473 | } | |
7b86ac33 CH |
1474 | #else |
1475 | #define pagemap_hugetlb_range NULL | |
1a5cb814 | 1476 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1477 | |
7b86ac33 CH |
1478 | static const struct mm_walk_ops pagemap_ops = { |
1479 | .pmd_entry = pagemap_pmd_range, | |
1480 | .pte_hole = pagemap_pte_hole, | |
1481 | .hugetlb_entry = pagemap_hugetlb_range, | |
1482 | }; | |
1483 | ||
85863e47 MM |
1484 | /* |
1485 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1486 | * | |
f16278c6 HR |
1487 | * For each page in the address space, this file contains one 64-bit entry |
1488 | * consisting of the following: | |
1489 | * | |
052fb0d6 | 1490 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1491 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1492 | * Bits 5-54 swap offset if swapped |
1ad1335d | 1493 | * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) |
77bb499b KK |
1494 | * Bit 56 page exclusively mapped |
1495 | * Bits 57-60 zero | |
052fb0d6 | 1496 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1497 | * Bit 62 page swapped |
1498 | * Bit 63 page present | |
1499 | * | |
1500 | * If the page is not present but in swap, then the PFN contains an | |
1501 | * encoding of the swap file number and the page's offset into the | |
1502 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1503 | * precisely which pages are mapped (or in swap) and comparing mapped |
1504 | * pages between processes. | |
1505 | * | |
1506 | * Efficient users of this interface will use /proc/pid/maps to | |
1507 | * determine which areas of memory are actually mapped and llseek to | |
1508 | * skip over unmapped regions. | |
1509 | */ | |
1510 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1511 | size_t count, loff_t *ppos) | |
1512 | { | |
a06db751 | 1513 | struct mm_struct *mm = file->private_data; |
85863e47 | 1514 | struct pagemapread pm; |
5d7e0d2b AM |
1515 | unsigned long src; |
1516 | unsigned long svpfn; | |
1517 | unsigned long start_vaddr; | |
1518 | unsigned long end_vaddr; | |
a06db751 | 1519 | int ret = 0, copied = 0; |
85863e47 | 1520 | |
388f7934 | 1521 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1522 | goto out; |
1523 | ||
85863e47 MM |
1524 | ret = -EINVAL; |
1525 | /* file position must be aligned */ | |
aae8679b | 1526 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1527 | goto out_mm; |
85863e47 MM |
1528 | |
1529 | ret = 0; | |
08161786 | 1530 | if (!count) |
a06db751 | 1531 | goto out_mm; |
08161786 | 1532 | |
1c90308e KK |
1533 | /* do not disclose physical addresses: attack vector */ |
1534 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1535 | ||
8c829622 | 1536 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
6da2ec56 | 1537 | pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1538 | ret = -ENOMEM; |
d82ef020 | 1539 | if (!pm.buffer) |
a06db751 | 1540 | goto out_mm; |
85863e47 | 1541 | |
5d7e0d2b AM |
1542 | src = *ppos; |
1543 | svpfn = src / PM_ENTRY_BYTES; | |
1544 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1545 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1546 | |
1547 | /* watch out for wraparound */ | |
a06db751 | 1548 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1549 | start_vaddr = end_vaddr; |
1550 | ||
1551 | /* | |
1552 | * The odds are that this will stop walking way | |
1553 | * before end_vaddr, because the length of the | |
1554 | * user buffer is tracked in "pm", and the walk | |
1555 | * will stop when we hit the end of the buffer. | |
1556 | */ | |
d82ef020 KH |
1557 | ret = 0; |
1558 | while (count && (start_vaddr < end_vaddr)) { | |
1559 | int len; | |
1560 | unsigned long end; | |
1561 | ||
1562 | pm.pos = 0; | |
ea251c1d | 1563 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1564 | /* overflow ? */ |
1565 | if (end < start_vaddr || end > end_vaddr) | |
1566 | end = end_vaddr; | |
d8ed45c5 | 1567 | ret = mmap_read_lock_killable(mm); |
ad80b932 KK |
1568 | if (ret) |
1569 | goto out_free; | |
7b86ac33 | 1570 | ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm); |
d8ed45c5 | 1571 | mmap_read_unlock(mm); |
d82ef020 KH |
1572 | start_vaddr = end; |
1573 | ||
1574 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1575 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1576 | ret = -EFAULT; |
a06db751 | 1577 | goto out_free; |
d82ef020 KH |
1578 | } |
1579 | copied += len; | |
1580 | buf += len; | |
1581 | count -= len; | |
85863e47 | 1582 | } |
d82ef020 KH |
1583 | *ppos += copied; |
1584 | if (!ret || ret == PM_END_OF_BUFFER) | |
1585 | ret = copied; | |
1586 | ||
98bc93e5 KM |
1587 | out_free: |
1588 | kfree(pm.buffer); | |
a06db751 KK |
1589 | out_mm: |
1590 | mmput(mm); | |
85863e47 MM |
1591 | out: |
1592 | return ret; | |
1593 | } | |
1594 | ||
541c237c PE |
1595 | static int pagemap_open(struct inode *inode, struct file *file) |
1596 | { | |
a06db751 KK |
1597 | struct mm_struct *mm; |
1598 | ||
a06db751 KK |
1599 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1600 | if (IS_ERR(mm)) | |
1601 | return PTR_ERR(mm); | |
1602 | file->private_data = mm; | |
1603 | return 0; | |
1604 | } | |
1605 | ||
1606 | static int pagemap_release(struct inode *inode, struct file *file) | |
1607 | { | |
1608 | struct mm_struct *mm = file->private_data; | |
1609 | ||
1610 | if (mm) | |
1611 | mmdrop(mm); | |
541c237c PE |
1612 | return 0; |
1613 | } | |
1614 | ||
85863e47 MM |
1615 | const struct file_operations proc_pagemap_operations = { |
1616 | .llseek = mem_lseek, /* borrow this */ | |
1617 | .read = pagemap_read, | |
541c237c | 1618 | .open = pagemap_open, |
a06db751 | 1619 | .release = pagemap_release, |
85863e47 | 1620 | }; |
1e883281 | 1621 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1622 | |
6e21c8f1 | 1623 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1624 | |
f69ff943 | 1625 | struct numa_maps { |
f69ff943 SW |
1626 | unsigned long pages; |
1627 | unsigned long anon; | |
1628 | unsigned long active; | |
1629 | unsigned long writeback; | |
1630 | unsigned long mapcount_max; | |
1631 | unsigned long dirty; | |
1632 | unsigned long swapcache; | |
1633 | unsigned long node[MAX_NUMNODES]; | |
1634 | }; | |
1635 | ||
5b52fc89 SW |
1636 | struct numa_maps_private { |
1637 | struct proc_maps_private proc_maps; | |
1638 | struct numa_maps md; | |
1639 | }; | |
1640 | ||
eb4866d0 DH |
1641 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1642 | unsigned long nr_pages) | |
f69ff943 SW |
1643 | { |
1644 | int count = page_mapcount(page); | |
1645 | ||
eb4866d0 | 1646 | md->pages += nr_pages; |
f69ff943 | 1647 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1648 | md->dirty += nr_pages; |
f69ff943 SW |
1649 | |
1650 | if (PageSwapCache(page)) | |
eb4866d0 | 1651 | md->swapcache += nr_pages; |
f69ff943 SW |
1652 | |
1653 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1654 | md->active += nr_pages; |
f69ff943 SW |
1655 | |
1656 | if (PageWriteback(page)) | |
eb4866d0 | 1657 | md->writeback += nr_pages; |
f69ff943 SW |
1658 | |
1659 | if (PageAnon(page)) | |
eb4866d0 | 1660 | md->anon += nr_pages; |
f69ff943 SW |
1661 | |
1662 | if (count > md->mapcount_max) | |
1663 | md->mapcount_max = count; | |
1664 | ||
eb4866d0 | 1665 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1666 | } |
1667 | ||
3200a8aa DH |
1668 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1669 | unsigned long addr) | |
1670 | { | |
1671 | struct page *page; | |
1672 | int nid; | |
1673 | ||
1674 | if (!pte_present(pte)) | |
1675 | return NULL; | |
1676 | ||
1677 | page = vm_normal_page(vma, addr, pte); | |
1678 | if (!page) | |
1679 | return NULL; | |
1680 | ||
1681 | if (PageReserved(page)) | |
1682 | return NULL; | |
1683 | ||
1684 | nid = page_to_nid(page); | |
4ff1b2c2 | 1685 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1686 | return NULL; |
1687 | ||
1688 | return page; | |
1689 | } | |
1690 | ||
28093f9f GS |
1691 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1692 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1693 | struct vm_area_struct *vma, | |
1694 | unsigned long addr) | |
1695 | { | |
1696 | struct page *page; | |
1697 | int nid; | |
1698 | ||
1699 | if (!pmd_present(pmd)) | |
1700 | return NULL; | |
1701 | ||
1702 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1703 | if (!page) | |
1704 | return NULL; | |
1705 | ||
1706 | if (PageReserved(page)) | |
1707 | return NULL; | |
1708 | ||
1709 | nid = page_to_nid(page); | |
1710 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1711 | return NULL; | |
1712 | ||
1713 | return page; | |
1714 | } | |
1715 | #endif | |
1716 | ||
f69ff943 SW |
1717 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1718 | unsigned long end, struct mm_walk *walk) | |
1719 | { | |
d85f4d6d NH |
1720 | struct numa_maps *md = walk->private; |
1721 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1722 | spinlock_t *ptl; |
1723 | pte_t *orig_pte; | |
1724 | pte_t *pte; | |
1725 | ||
28093f9f | 1726 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1727 | ptl = pmd_trans_huge_lock(pmd, vma); |
1728 | if (ptl) { | |
025c5b24 NH |
1729 | struct page *page; |
1730 | ||
28093f9f | 1731 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1732 | if (page) |
28093f9f | 1733 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1734 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1735 | spin_unlock(ptl); |
025c5b24 | 1736 | return 0; |
32ef4384 DH |
1737 | } |
1738 | ||
1a5a9906 AA |
1739 | if (pmd_trans_unstable(pmd)) |
1740 | return 0; | |
28093f9f | 1741 | #endif |
f69ff943 SW |
1742 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1743 | do { | |
d85f4d6d | 1744 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1745 | if (!page) |
1746 | continue; | |
eb4866d0 | 1747 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1748 | |
1749 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1750 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1751 | cond_resched(); |
f69ff943 SW |
1752 | return 0; |
1753 | } | |
1754 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1755 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1756 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1757 | { | |
5c2ff95e | 1758 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1759 | struct numa_maps *md; |
1760 | struct page *page; | |
1761 | ||
5c2ff95e | 1762 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1763 | return 0; |
1764 | ||
5c2ff95e | 1765 | page = pte_page(huge_pte); |
f69ff943 SW |
1766 | if (!page) |
1767 | return 0; | |
1768 | ||
1769 | md = walk->private; | |
5c2ff95e | 1770 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1771 | return 0; |
1772 | } | |
1773 | ||
1774 | #else | |
632fd60f | 1775 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1776 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1777 | { | |
1778 | return 0; | |
1779 | } | |
1780 | #endif | |
1781 | ||
7b86ac33 CH |
1782 | static const struct mm_walk_ops show_numa_ops = { |
1783 | .hugetlb_entry = gather_hugetlb_stats, | |
1784 | .pmd_entry = gather_pte_stats, | |
1785 | }; | |
1786 | ||
f69ff943 SW |
1787 | /* |
1788 | * Display pages allocated per node and memory policy via /proc. | |
1789 | */ | |
871305bb | 1790 | static int show_numa_map(struct seq_file *m, void *v) |
f69ff943 | 1791 | { |
5b52fc89 SW |
1792 | struct numa_maps_private *numa_priv = m->private; |
1793 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1794 | struct vm_area_struct *vma = v; |
5b52fc89 | 1795 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1796 | struct file *file = vma->vm_file; |
1797 | struct mm_struct *mm = vma->vm_mm; | |
f69ff943 | 1798 | struct mempolicy *pol; |
948927ee DR |
1799 | char buffer[64]; |
1800 | int nid; | |
f69ff943 SW |
1801 | |
1802 | if (!mm) | |
1803 | return 0; | |
1804 | ||
5b52fc89 SW |
1805 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1806 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1807 | |
498f2371 ON |
1808 | pol = __get_vma_policy(vma, vma->vm_start); |
1809 | if (pol) { | |
1810 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1811 | mpol_cond_put(pol); | |
1812 | } else { | |
1813 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1814 | } | |
f69ff943 SW |
1815 | |
1816 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1817 | ||
1818 | if (file) { | |
17c2b4ee | 1819 | seq_puts(m, " file="); |
2726d566 | 1820 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1821 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1822 | seq_puts(m, " heap"); |
1240ea0d | 1823 | } else if (is_stack(vma)) { |
65376df5 | 1824 | seq_puts(m, " stack"); |
f69ff943 SW |
1825 | } |
1826 | ||
fc360bd9 | 1827 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1828 | seq_puts(m, " huge"); |
fc360bd9 | 1829 | |
d85f4d6d | 1830 | /* mmap_sem is held by m_start */ |
7b86ac33 | 1831 | walk_page_vma(vma, &show_numa_ops, md); |
f69ff943 SW |
1832 | |
1833 | if (!md->pages) | |
1834 | goto out; | |
1835 | ||
1836 | if (md->anon) | |
1837 | seq_printf(m, " anon=%lu", md->anon); | |
1838 | ||
1839 | if (md->dirty) | |
1840 | seq_printf(m, " dirty=%lu", md->dirty); | |
1841 | ||
1842 | if (md->pages != md->anon && md->pages != md->dirty) | |
1843 | seq_printf(m, " mapped=%lu", md->pages); | |
1844 | ||
1845 | if (md->mapcount_max > 1) | |
1846 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1847 | ||
1848 | if (md->swapcache) | |
1849 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1850 | ||
1851 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1852 | seq_printf(m, " active=%lu", md->active); | |
1853 | ||
1854 | if (md->writeback) | |
1855 | seq_printf(m, " writeback=%lu", md->writeback); | |
1856 | ||
948927ee DR |
1857 | for_each_node_state(nid, N_MEMORY) |
1858 | if (md->node[nid]) | |
1859 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1860 | |
1861 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1862 | out: |
1863 | seq_putc(m, '\n'); | |
f69ff943 SW |
1864 | return 0; |
1865 | } | |
5b52fc89 | 1866 | |
03a44825 | 1867 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1868 | .start = m_start, |
1869 | .next = m_next, | |
1870 | .stop = m_stop, | |
871305bb | 1871 | .show = show_numa_map, |
6e21c8f1 | 1872 | }; |
662795de | 1873 | |
b7643757 SP |
1874 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1875 | { | |
871305bb VB |
1876 | return proc_maps_open(inode, file, &proc_pid_numa_maps_op, |
1877 | sizeof(struct numa_maps_private)); | |
b7643757 SP |
1878 | } |
1879 | ||
1880 | const struct file_operations proc_pid_numa_maps_operations = { | |
1881 | .open = pid_numa_maps_open, | |
1882 | .read = seq_read, | |
1883 | .llseek = seq_lseek, | |
29a40ace | 1884 | .release = proc_map_release, |
b7643757 SP |
1885 | }; |
1886 | ||
f69ff943 | 1887 | #endif /* CONFIG_NUMA */ |