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> |
17fca131 | 4 | #include <linux/mm_inline.h> |
1da177e4 | 5 | #include <linux/hugetlb.h> |
22e057c5 | 6 | #include <linux/huge_mm.h> |
1da177e4 LT |
7 | #include <linux/mount.h> |
8 | #include <linux/seq_file.h> | |
e070ad49 | 9 | #include <linux/highmem.h> |
5096add8 | 10 | #include <linux/ptrace.h> |
5a0e3ad6 | 11 | #include <linux/slab.h> |
6e21c8f1 CL |
12 | #include <linux/pagemap.h> |
13 | #include <linux/mempolicy.h> | |
22e057c5 | 14 | #include <linux/rmap.h> |
85863e47 | 15 | #include <linux/swap.h> |
6e84f315 | 16 | #include <linux/sched/mm.h> |
85863e47 | 17 | #include <linux/swapops.h> |
0f8975ec | 18 | #include <linux/mmu_notifier.h> |
33c3fc71 | 19 | #include <linux/page_idle.h> |
6a15a370 | 20 | #include <linux/shmem_fs.h> |
b3a81d08 | 21 | #include <linux/uaccess.h> |
27cca866 | 22 | #include <linux/pkeys.h> |
e070ad49 | 23 | |
1da177e4 | 24 | #include <asm/elf.h> |
b3a81d08 | 25 | #include <asm/tlb.h> |
e070ad49 | 26 | #include <asm/tlbflush.h> |
1da177e4 LT |
27 | #include "internal.h" |
28 | ||
d1be35cb AV |
29 | #define SEQ_PUT_DEC(str, val) \ |
30 | seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) | |
df5f8314 | 31 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 32 | { |
af5b0f6a | 33 | unsigned long text, lib, swap, anon, file, shmem; |
365e9c87 HD |
34 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
35 | ||
8cee852e JM |
36 | anon = get_mm_counter(mm, MM_ANONPAGES); |
37 | file = get_mm_counter(mm, MM_FILEPAGES); | |
38 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
39 | ||
365e9c87 HD |
40 | /* |
41 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
42 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
43 | * collector of these hiwater stats must therefore get total_vm | |
44 | * and rss too, which will usually be the higher. Barriers? not | |
45 | * worth the effort, such snapshots can always be inconsistent. | |
46 | */ | |
47 | hiwater_vm = total_vm = mm->total_vm; | |
48 | if (hiwater_vm < mm->hiwater_vm) | |
49 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 50 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
51 | if (hiwater_rss < mm->hiwater_rss) |
52 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 53 | |
8526d84f KK |
54 | /* split executable areas between text and lib */ |
55 | text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK); | |
56 | text = min(text, mm->exec_vm << PAGE_SHIFT); | |
57 | lib = (mm->exec_vm << PAGE_SHIFT) - text; | |
58 | ||
b084d435 | 59 | swap = get_mm_counter(mm, MM_SWAPENTS); |
d1be35cb AV |
60 | SEQ_PUT_DEC("VmPeak:\t", hiwater_vm); |
61 | SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm); | |
62 | SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm); | |
70f8a3ca | 63 | SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm)); |
d1be35cb AV |
64 | SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss); |
65 | SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss); | |
66 | SEQ_PUT_DEC(" kB\nRssAnon:\t", anon); | |
67 | SEQ_PUT_DEC(" kB\nRssFile:\t", file); | |
68 | SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem); | |
69 | SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm); | |
70 | SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm); | |
71 | seq_put_decimal_ull_width(m, | |
72 | " kB\nVmExe:\t", text >> 10, 8); | |
73 | seq_put_decimal_ull_width(m, | |
74 | " kB\nVmLib:\t", lib >> 10, 8); | |
75 | seq_put_decimal_ull_width(m, | |
76 | " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8); | |
77 | SEQ_PUT_DEC(" kB\nVmSwap:\t", swap); | |
78 | seq_puts(m, " kB\n"); | |
5d317b2b | 79 | hugetlb_report_usage(m, mm); |
1da177e4 | 80 | } |
d1be35cb | 81 | #undef SEQ_PUT_DEC |
1da177e4 LT |
82 | |
83 | unsigned long task_vsize(struct mm_struct *mm) | |
84 | { | |
85 | return PAGE_SIZE * mm->total_vm; | |
86 | } | |
87 | ||
a2ade7b6 AD |
88 | unsigned long task_statm(struct mm_struct *mm, |
89 | unsigned long *shared, unsigned long *text, | |
90 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 91 | { |
eca56ff9 JM |
92 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
93 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
94 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
95 | >> PAGE_SHIFT; | |
84638335 | 96 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 97 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
98 | return mm->total_vm; |
99 | } | |
100 | ||
9e781440 KH |
101 | #ifdef CONFIG_NUMA |
102 | /* | |
498f2371 | 103 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
104 | */ |
105 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
106 | { | |
107 | struct task_struct *task = priv->task; | |
108 | ||
109 | task_lock(task); | |
498f2371 | 110 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
111 | mpol_get(priv->task_mempolicy); |
112 | task_unlock(task); | |
113 | } | |
114 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
115 | { | |
116 | mpol_put(priv->task_mempolicy); | |
117 | } | |
118 | #else | |
119 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
120 | { | |
121 | } | |
122 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
123 | { | |
124 | } | |
125 | #endif | |
126 | ||
0c255321 | 127 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 128 | { |
a6198797 | 129 | struct proc_maps_private *priv = m->private; |
4781f2c3 | 130 | unsigned long last_addr = *ppos; |
a6198797 | 131 | struct mm_struct *mm; |
0c255321 | 132 | struct vm_area_struct *vma; |
a6198797 | 133 | |
c2e88d22 | 134 | /* See m_next(). Zero at the start or after lseek. */ |
b8c20a9b ON |
135 | if (last_addr == -1UL) |
136 | return NULL; | |
137 | ||
2c03376d | 138 | priv->task = get_proc_task(priv->inode); |
a6198797 | 139 | if (!priv->task) |
ec6fd8a4 | 140 | return ERR_PTR(-ESRCH); |
a6198797 | 141 | |
29a40ace | 142 | mm = priv->mm; |
d07ded61 MWO |
143 | if (!mm || !mmget_not_zero(mm)) { |
144 | put_task_struct(priv->task); | |
145 | priv->task = NULL; | |
29a40ace | 146 | return NULL; |
d07ded61 | 147 | } |
a6198797 | 148 | |
d8ed45c5 | 149 | if (mmap_read_lock_killable(mm)) { |
8a713e7d | 150 | mmput(mm); |
d07ded61 MWO |
151 | put_task_struct(priv->task); |
152 | priv->task = NULL; | |
8a713e7d KK |
153 | return ERR_PTR(-EINTR); |
154 | } | |
155 | ||
9e781440 | 156 | hold_task_mempolicy(priv); |
0c255321 | 157 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 158 | |
c2e88d22 MWO |
159 | vma = find_vma(mm, last_addr); |
160 | if (vma) | |
a6198797 | 161 | return vma; |
59b4bf12 | 162 | |
c2e88d22 | 163 | return priv->tail_vma; |
a6198797 MM |
164 | } |
165 | ||
4781f2c3 | 166 | static void *m_next(struct seq_file *m, void *v, loff_t *ppos) |
a6198797 MM |
167 | { |
168 | struct proc_maps_private *priv = m->private; | |
fad95500 MWO |
169 | struct vm_area_struct *next, *vma = v; |
170 | ||
171 | if (vma == priv->tail_vma) | |
172 | next = NULL; | |
173 | else if (vma->vm_next) | |
174 | next = vma->vm_next; | |
175 | else | |
176 | next = priv->tail_vma; | |
a6198797 | 177 | |
4781f2c3 | 178 | *ppos = next ? next->vm_start : -1UL; |
c2e88d22 | 179 | |
59b4bf12 | 180 | return next; |
a6198797 MM |
181 | } |
182 | ||
183 | static void m_stop(struct seq_file *m, void *v) | |
184 | { | |
185 | struct proc_maps_private *priv = m->private; | |
d07ded61 | 186 | struct mm_struct *mm = priv->mm; |
a6198797 | 187 | |
d07ded61 MWO |
188 | if (!priv->task) |
189 | return; | |
190 | ||
191 | release_task_mempolicy(priv); | |
d8ed45c5 | 192 | mmap_read_unlock(mm); |
d07ded61 MWO |
193 | mmput(mm); |
194 | put_task_struct(priv->task); | |
195 | priv->task = NULL; | |
a6198797 MM |
196 | } |
197 | ||
4db7d0ee ON |
198 | static int proc_maps_open(struct inode *inode, struct file *file, |
199 | const struct seq_operations *ops, int psize) | |
200 | { | |
201 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
202 | ||
203 | if (!priv) | |
204 | return -ENOMEM; | |
205 | ||
2c03376d | 206 | priv->inode = inode; |
29a40ace ON |
207 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
208 | if (IS_ERR(priv->mm)) { | |
209 | int err = PTR_ERR(priv->mm); | |
210 | ||
211 | seq_release_private(inode, file); | |
212 | return err; | |
213 | } | |
214 | ||
4db7d0ee ON |
215 | return 0; |
216 | } | |
217 | ||
29a40ace ON |
218 | static int proc_map_release(struct inode *inode, struct file *file) |
219 | { | |
220 | struct seq_file *seq = file->private_data; | |
221 | struct proc_maps_private *priv = seq->private; | |
222 | ||
223 | if (priv->mm) | |
224 | mmdrop(priv->mm); | |
225 | ||
226 | return seq_release_private(inode, file); | |
227 | } | |
228 | ||
a6198797 | 229 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 230 | const struct seq_operations *ops) |
a6198797 | 231 | { |
4db7d0ee ON |
232 | return proc_maps_open(inode, file, ops, |
233 | sizeof(struct proc_maps_private)); | |
a6198797 | 234 | } |
e070ad49 | 235 | |
65376df5 JW |
236 | /* |
237 | * Indicate if the VMA is a stack for the given task; for | |
238 | * /proc/PID/maps that is the stack of the main task. | |
239 | */ | |
1240ea0d | 240 | static int is_stack(struct vm_area_struct *vma) |
58cb6548 | 241 | { |
b18cb64e AL |
242 | /* |
243 | * We make no effort to guess what a given thread considers to be | |
244 | * its "stack". It's not even well-defined for programs written | |
245 | * languages like Go. | |
246 | */ | |
247 | return vma->vm_start <= vma->vm_mm->start_stack && | |
248 | vma->vm_end >= vma->vm_mm->start_stack; | |
58cb6548 ON |
249 | } |
250 | ||
493b0e9d DC |
251 | static void show_vma_header_prefix(struct seq_file *m, |
252 | unsigned long start, unsigned long end, | |
253 | vm_flags_t flags, unsigned long long pgoff, | |
254 | dev_t dev, unsigned long ino) | |
255 | { | |
256 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
0e3dc019 AV |
257 | seq_put_hex_ll(m, NULL, start, 8); |
258 | seq_put_hex_ll(m, "-", end, 8); | |
259 | seq_putc(m, ' '); | |
260 | seq_putc(m, flags & VM_READ ? 'r' : '-'); | |
261 | seq_putc(m, flags & VM_WRITE ? 'w' : '-'); | |
262 | seq_putc(m, flags & VM_EXEC ? 'x' : '-'); | |
263 | seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p'); | |
264 | seq_put_hex_ll(m, " ", pgoff, 8); | |
265 | seq_put_hex_ll(m, " ", MAJOR(dev), 2); | |
266 | seq_put_hex_ll(m, ":", MINOR(dev), 2); | |
267 | seq_put_decimal_ull(m, " ", ino); | |
268 | seq_putc(m, ' '); | |
493b0e9d DC |
269 | } |
270 | ||
b7643757 | 271 | static void |
871305bb | 272 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 273 | { |
e070ad49 ML |
274 | struct mm_struct *mm = vma->vm_mm; |
275 | struct file *file = vma->vm_file; | |
ca16d140 | 276 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 277 | unsigned long ino = 0; |
6260a4b0 | 278 | unsigned long long pgoff = 0; |
a09a79f6 | 279 | unsigned long start, end; |
1da177e4 | 280 | dev_t dev = 0; |
b7643757 | 281 | const char *name = NULL; |
1da177e4 LT |
282 | |
283 | if (file) { | |
496ad9aa | 284 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
285 | dev = inode->i_sb->s_dev; |
286 | ino = inode->i_ino; | |
6260a4b0 | 287 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
288 | } |
289 | ||
d7824370 | 290 | start = vma->vm_start; |
a09a79f6 | 291 | end = vma->vm_end; |
493b0e9d | 292 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
1da177e4 LT |
293 | |
294 | /* | |
295 | * Print the dentry name for named mappings, and a | |
296 | * special [heap] marker for the heap: | |
297 | */ | |
e070ad49 | 298 | if (file) { |
652586df | 299 | seq_pad(m, ' '); |
2726d566 | 300 | seq_file_path(m, file, "\n"); |
b7643757 SP |
301 | goto done; |
302 | } | |
303 | ||
78d683e8 AL |
304 | if (vma->vm_ops && vma->vm_ops->name) { |
305 | name = vma->vm_ops->name(vma); | |
306 | if (name) | |
307 | goto done; | |
308 | } | |
309 | ||
b7643757 SP |
310 | name = arch_vma_name(vma); |
311 | if (!name) { | |
5c26f6ac | 312 | struct anon_vma_name *anon_name; |
9a10064f | 313 | |
b7643757 SP |
314 | if (!mm) { |
315 | name = "[vdso]"; | |
316 | goto done; | |
317 | } | |
318 | ||
319 | if (vma->vm_start <= mm->brk && | |
320 | vma->vm_end >= mm->start_brk) { | |
321 | name = "[heap]"; | |
322 | goto done; | |
323 | } | |
324 | ||
9a10064f | 325 | if (is_stack(vma)) { |
65376df5 | 326 | name = "[stack]"; |
9a10064f CC |
327 | goto done; |
328 | } | |
329 | ||
5c26f6ac | 330 | anon_name = anon_vma_name(vma); |
9a10064f CC |
331 | if (anon_name) { |
332 | seq_pad(m, ' '); | |
5c26f6ac | 333 | seq_printf(m, "[anon:%s]", anon_name->name); |
9a10064f | 334 | } |
b7643757 SP |
335 | } |
336 | ||
337 | done: | |
338 | if (name) { | |
652586df | 339 | seq_pad(m, ' '); |
b7643757 | 340 | seq_puts(m, name); |
1da177e4 LT |
341 | } |
342 | seq_putc(m, '\n'); | |
7c88db0c JK |
343 | } |
344 | ||
871305bb | 345 | static int show_map(struct seq_file *m, void *v) |
7c88db0c | 346 | { |
871305bb | 347 | show_map_vma(m, v); |
1da177e4 LT |
348 | return 0; |
349 | } | |
350 | ||
03a44825 | 351 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
352 | .start = m_start, |
353 | .next = m_next, | |
354 | .stop = m_stop, | |
871305bb | 355 | .show = show_map |
a6198797 MM |
356 | }; |
357 | ||
b7643757 | 358 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
359 | { |
360 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
361 | } | |
362 | ||
b7643757 SP |
363 | const struct file_operations proc_pid_maps_operations = { |
364 | .open = pid_maps_open, | |
365 | .read = seq_read, | |
366 | .llseek = seq_lseek, | |
29a40ace | 367 | .release = proc_map_release, |
b7643757 SP |
368 | }; |
369 | ||
a6198797 MM |
370 | /* |
371 | * Proportional Set Size(PSS): my share of RSS. | |
372 | * | |
373 | * PSS of a process is the count of pages it has in memory, where each | |
374 | * page is divided by the number of processes sharing it. So if a | |
375 | * process has 1000 pages all to itself, and 1000 shared with one other | |
376 | * process, its PSS will be 1500. | |
377 | * | |
378 | * To keep (accumulated) division errors low, we adopt a 64bit | |
379 | * fixed-point pss counter to minimize division errors. So (pss >> | |
380 | * PSS_SHIFT) would be the real byte count. | |
381 | * | |
382 | * A shift of 12 before division means (assuming 4K page size): | |
383 | * - 1M 3-user-pages add up to 8KB errors; | |
384 | * - supports mapcount up to 2^24, or 16M; | |
385 | * - supports PSS up to 2^52 bytes, or 4PB. | |
386 | */ | |
387 | #define PSS_SHIFT 12 | |
388 | ||
1e883281 | 389 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 390 | struct mem_size_stats { |
a6198797 MM |
391 | unsigned long resident; |
392 | unsigned long shared_clean; | |
393 | unsigned long shared_dirty; | |
394 | unsigned long private_clean; | |
395 | unsigned long private_dirty; | |
396 | unsigned long referenced; | |
b40d4f84 | 397 | unsigned long anonymous; |
cf8496ea | 398 | unsigned long lazyfree; |
4031a219 | 399 | unsigned long anonymous_thp; |
65c45377 | 400 | unsigned long shmem_thp; |
60fbf0ab | 401 | unsigned long file_thp; |
214e471f | 402 | unsigned long swap; |
25ee01a2 NH |
403 | unsigned long shared_hugetlb; |
404 | unsigned long private_hugetlb; | |
a6198797 | 405 | u64 pss; |
ee2ad71b LS |
406 | u64 pss_anon; |
407 | u64 pss_file; | |
408 | u64 pss_shmem; | |
493b0e9d | 409 | u64 pss_locked; |
8334b962 | 410 | u64 swap_pss; |
a6198797 MM |
411 | }; |
412 | ||
ee2ad71b LS |
413 | static void smaps_page_accumulate(struct mem_size_stats *mss, |
414 | struct page *page, unsigned long size, unsigned long pss, | |
415 | bool dirty, bool locked, bool private) | |
416 | { | |
417 | mss->pss += pss; | |
418 | ||
419 | if (PageAnon(page)) | |
420 | mss->pss_anon += pss; | |
421 | else if (PageSwapBacked(page)) | |
422 | mss->pss_shmem += pss; | |
423 | else | |
424 | mss->pss_file += pss; | |
425 | ||
426 | if (locked) | |
427 | mss->pss_locked += pss; | |
428 | ||
429 | if (dirty || PageDirty(page)) { | |
430 | if (private) | |
431 | mss->private_dirty += size; | |
432 | else | |
433 | mss->shared_dirty += size; | |
434 | } else { | |
435 | if (private) | |
436 | mss->private_clean += size; | |
437 | else | |
438 | mss->shared_clean += size; | |
439 | } | |
440 | } | |
441 | ||
c164e038 | 442 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
24d7275c YS |
443 | bool compound, bool young, bool dirty, bool locked, |
444 | bool migration) | |
c164e038 | 445 | { |
d8c6546b | 446 | int i, nr = compound ? compound_nr(page) : 1; |
afd9883f | 447 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 448 | |
ee2ad71b LS |
449 | /* |
450 | * First accumulate quantities that depend only on |size| and the type | |
451 | * of the compound page. | |
452 | */ | |
cf8496ea | 453 | if (PageAnon(page)) { |
c164e038 | 454 | mss->anonymous += size; |
cf8496ea SL |
455 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
456 | mss->lazyfree += size; | |
457 | } | |
c164e038 KS |
458 | |
459 | mss->resident += size; | |
460 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 461 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 462 | mss->referenced += size; |
c164e038 | 463 | |
afd9883f | 464 | /* |
ee2ad71b LS |
465 | * Then accumulate quantities that may depend on sharing, or that may |
466 | * differ page-by-page. | |
467 | * | |
afd9883f KS |
468 | * page_count(page) == 1 guarantees the page is mapped exactly once. |
469 | * If any subpage of the compound page mapped with PTE it would elevate | |
470 | * page_count(). | |
24d7275c YS |
471 | * |
472 | * The page_mapcount() is called to get a snapshot of the mapcount. | |
473 | * Without holding the page lock this snapshot can be slightly wrong as | |
474 | * we cannot always read the mapcount atomically. It is not safe to | |
475 | * call page_mapcount() even with PTL held if the page is not mapped, | |
476 | * especially for migration entries. Treat regular migration entries | |
477 | * as mapcount == 1. | |
afd9883f | 478 | */ |
24d7275c | 479 | if ((page_count(page) == 1) || migration) { |
ee2ad71b LS |
480 | smaps_page_accumulate(mss, page, size, size << PSS_SHIFT, dirty, |
481 | locked, true); | |
afd9883f KS |
482 | return; |
483 | } | |
afd9883f KS |
484 | for (i = 0; i < nr; i++, page++) { |
485 | int mapcount = page_mapcount(page); | |
ee2ad71b LS |
486 | unsigned long pss = PAGE_SIZE << PSS_SHIFT; |
487 | if (mapcount >= 2) | |
488 | pss /= mapcount; | |
489 | smaps_page_accumulate(mss, page, PAGE_SIZE, pss, dirty, locked, | |
490 | mapcount < 2); | |
c164e038 KS |
491 | } |
492 | } | |
ae11c4d9 | 493 | |
c261e7d9 | 494 | #ifdef CONFIG_SHMEM |
c261e7d9 | 495 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
b7a16c7a | 496 | __always_unused int depth, struct mm_walk *walk) |
c261e7d9 VB |
497 | { |
498 | struct mem_size_stats *mss = walk->private; | |
10c848c8 | 499 | struct vm_area_struct *vma = walk->vma; |
c261e7d9 | 500 | |
10c848c8 PX |
501 | mss->swap += shmem_partial_swap_usage(walk->vma->vm_file->f_mapping, |
502 | linear_page_index(vma, addr), | |
503 | linear_page_index(vma, end)); | |
c261e7d9 VB |
504 | |
505 | return 0; | |
506 | } | |
7b86ac33 CH |
507 | #else |
508 | #define smaps_pte_hole NULL | |
509 | #endif /* CONFIG_SHMEM */ | |
c261e7d9 | 510 | |
23010032 PX |
511 | static void smaps_pte_hole_lookup(unsigned long addr, struct mm_walk *walk) |
512 | { | |
513 | #ifdef CONFIG_SHMEM | |
514 | if (walk->ops->pte_hole) { | |
515 | /* depth is not used */ | |
516 | smaps_pte_hole(addr, addr + PAGE_SIZE, 0, walk); | |
517 | } | |
518 | #endif | |
519 | } | |
520 | ||
c164e038 KS |
521 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
522 | struct mm_walk *walk) | |
ae11c4d9 DH |
523 | { |
524 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 525 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 526 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
b1d4d9e0 | 527 | struct page *page = NULL; |
24d7275c | 528 | bool migration = false; |
ae11c4d9 | 529 | |
c164e038 KS |
530 | if (pte_present(*pte)) { |
531 | page = vm_normal_page(vma, addr, *pte); | |
532 | } else if (is_swap_pte(*pte)) { | |
533 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 534 | |
8334b962 MK |
535 | if (!non_swap_entry(swpent)) { |
536 | int mapcount; | |
537 | ||
c164e038 | 538 | mss->swap += PAGE_SIZE; |
8334b962 MK |
539 | mapcount = swp_swapcount(swpent); |
540 | if (mapcount >= 2) { | |
541 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
542 | ||
543 | do_div(pss_delta, mapcount); | |
544 | mss->swap_pss += pss_delta; | |
545 | } else { | |
546 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
547 | } | |
24d7275c YS |
548 | } else if (is_pfn_swap_entry(swpent)) { |
549 | if (is_migration_entry(swpent)) | |
550 | migration = true; | |
af5cdaf8 | 551 | page = pfn_swap_entry_to_page(swpent); |
24d7275c | 552 | } |
23010032 PX |
553 | } else { |
554 | smaps_pte_hole_lookup(addr, walk); | |
48131e03 | 555 | return; |
b1d4d9e0 | 556 | } |
ae11c4d9 | 557 | |
ae11c4d9 DH |
558 | if (!page) |
559 | return; | |
afd9883f | 560 | |
24d7275c YS |
561 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), |
562 | locked, migration); | |
ae11c4d9 DH |
563 | } |
564 | ||
c164e038 KS |
565 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
566 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
567 | struct mm_walk *walk) | |
568 | { | |
569 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 570 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 571 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
c94b6923 | 572 | struct page *page = NULL; |
24d7275c | 573 | bool migration = false; |
c94b6923 HY |
574 | |
575 | if (pmd_present(*pmd)) { | |
576 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
577 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
578 | } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd))) { | |
579 | swp_entry_t entry = pmd_to_swp_entry(*pmd); | |
c164e038 | 580 | |
24d7275c YS |
581 | if (is_migration_entry(entry)) { |
582 | migration = true; | |
af5cdaf8 | 583 | page = pfn_swap_entry_to_page(entry); |
24d7275c | 584 | } |
c94b6923 | 585 | } |
c164e038 KS |
586 | if (IS_ERR_OR_NULL(page)) |
587 | return; | |
65c45377 KS |
588 | if (PageAnon(page)) |
589 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
590 | else if (PageSwapBacked(page)) | |
591 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
592 | else if (is_zone_device_page(page)) |
593 | /* pass */; | |
65c45377 | 594 | else |
60fbf0ab | 595 | mss->file_thp += HPAGE_PMD_SIZE; |
24d7275c YS |
596 | |
597 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), | |
598 | locked, migration); | |
c164e038 KS |
599 | } |
600 | #else | |
601 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
602 | struct mm_walk *walk) | |
603 | { | |
604 | } | |
605 | #endif | |
606 | ||
b3ae5acb | 607 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 608 | struct mm_walk *walk) |
e070ad49 | 609 | { |
14eb6fdd | 610 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 611 | pte_t *pte; |
705e87c0 | 612 | spinlock_t *ptl; |
e070ad49 | 613 | |
b6ec57f4 KS |
614 | ptl = pmd_trans_huge_lock(pmd, vma); |
615 | if (ptl) { | |
c94b6923 | 616 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 617 | spin_unlock(ptl); |
14038302 | 618 | goto out; |
22e057c5 | 619 | } |
1a5a9906 AA |
620 | |
621 | if (pmd_trans_unstable(pmd)) | |
14038302 | 622 | goto out; |
22e057c5 | 623 | /* |
c1e8d7c6 | 624 | * The mmap_lock held all the way back in m_start() is what |
22e057c5 DH |
625 | * keeps khugepaged out of here and from collapsing things |
626 | * in here. | |
627 | */ | |
705e87c0 | 628 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 629 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 630 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 631 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 632 | out: |
705e87c0 | 633 | cond_resched(); |
b3ae5acb | 634 | return 0; |
e070ad49 ML |
635 | } |
636 | ||
834f82e2 CG |
637 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
638 | { | |
639 | /* | |
640 | * Don't forget to update Documentation/ on changes. | |
641 | */ | |
642 | static const char mnemonics[BITS_PER_LONG][2] = { | |
643 | /* | |
644 | * In case if we meet a flag we don't know about. | |
645 | */ | |
646 | [0 ... (BITS_PER_LONG-1)] = "??", | |
647 | ||
648 | [ilog2(VM_READ)] = "rd", | |
649 | [ilog2(VM_WRITE)] = "wr", | |
650 | [ilog2(VM_EXEC)] = "ex", | |
651 | [ilog2(VM_SHARED)] = "sh", | |
652 | [ilog2(VM_MAYREAD)] = "mr", | |
653 | [ilog2(VM_MAYWRITE)] = "mw", | |
654 | [ilog2(VM_MAYEXEC)] = "me", | |
655 | [ilog2(VM_MAYSHARE)] = "ms", | |
656 | [ilog2(VM_GROWSDOWN)] = "gd", | |
657 | [ilog2(VM_PFNMAP)] = "pf", | |
834f82e2 CG |
658 | [ilog2(VM_LOCKED)] = "lo", |
659 | [ilog2(VM_IO)] = "io", | |
660 | [ilog2(VM_SEQ_READ)] = "sr", | |
661 | [ilog2(VM_RAND_READ)] = "rr", | |
662 | [ilog2(VM_DONTCOPY)] = "dc", | |
663 | [ilog2(VM_DONTEXPAND)] = "de", | |
664 | [ilog2(VM_ACCOUNT)] = "ac", | |
665 | [ilog2(VM_NORESERVE)] = "nr", | |
666 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 667 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 668 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 669 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 670 | [ilog2(VM_DONTDUMP)] = "dd", |
424037b7 DK |
671 | #ifdef CONFIG_ARM64_BTI |
672 | [ilog2(VM_ARM64_BTI)] = "bt", | |
673 | #endif | |
ec8e41ae NH |
674 | #ifdef CONFIG_MEM_SOFT_DIRTY |
675 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
676 | #endif | |
834f82e2 CG |
677 | [ilog2(VM_MIXEDMAP)] = "mm", |
678 | [ilog2(VM_HUGEPAGE)] = "hg", | |
679 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
680 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
681 | [ilog2(VM_UFFD_MISSING)]= "um", |
682 | [ilog2(VM_UFFD_WP)] = "uw", | |
9f341931 CM |
683 | #ifdef CONFIG_ARM64_MTE |
684 | [ilog2(VM_MTE)] = "mt", | |
685 | [ilog2(VM_MTE_ALLOWED)] = "", | |
686 | #endif | |
5212213a | 687 | #ifdef CONFIG_ARCH_HAS_PKEYS |
c1192f84 DH |
688 | /* These come out via ProtectionKey: */ |
689 | [ilog2(VM_PKEY_BIT0)] = "", | |
690 | [ilog2(VM_PKEY_BIT1)] = "", | |
691 | [ilog2(VM_PKEY_BIT2)] = "", | |
692 | [ilog2(VM_PKEY_BIT3)] = "", | |
2c9e0a6f RP |
693 | #if VM_PKEY_BIT4 |
694 | [ilog2(VM_PKEY_BIT4)] = "", | |
c1192f84 | 695 | #endif |
5212213a | 696 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
7677f7fd AR |
697 | #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR |
698 | [ilog2(VM_UFFD_MINOR)] = "ui", | |
699 | #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ | |
834f82e2 CG |
700 | }; |
701 | size_t i; | |
702 | ||
703 | seq_puts(m, "VmFlags: "); | |
704 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
705 | if (!mnemonics[i][0]) |
706 | continue; | |
834f82e2 | 707 | if (vma->vm_flags & (1UL << i)) { |
f6640663 AV |
708 | seq_putc(m, mnemonics[i][0]); |
709 | seq_putc(m, mnemonics[i][1]); | |
710 | seq_putc(m, ' '); | |
834f82e2 CG |
711 | } |
712 | } | |
713 | seq_putc(m, '\n'); | |
714 | } | |
715 | ||
25ee01a2 NH |
716 | #ifdef CONFIG_HUGETLB_PAGE |
717 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
718 | unsigned long addr, unsigned long end, | |
719 | struct mm_walk *walk) | |
720 | { | |
721 | struct mem_size_stats *mss = walk->private; | |
722 | struct vm_area_struct *vma = walk->vma; | |
723 | struct page *page = NULL; | |
724 | ||
725 | if (pte_present(*pte)) { | |
726 | page = vm_normal_page(vma, addr, *pte); | |
727 | } else if (is_swap_pte(*pte)) { | |
728 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
729 | ||
af5cdaf8 AP |
730 | if (is_pfn_swap_entry(swpent)) |
731 | page = pfn_swap_entry_to_page(swpent); | |
25ee01a2 NH |
732 | } |
733 | if (page) { | |
734 | int mapcount = page_mapcount(page); | |
735 | ||
736 | if (mapcount >= 2) | |
737 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
738 | else | |
739 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
740 | } | |
741 | return 0; | |
742 | } | |
7b86ac33 CH |
743 | #else |
744 | #define smaps_hugetlb_range NULL | |
25ee01a2 NH |
745 | #endif /* HUGETLB_PAGE */ |
746 | ||
7b86ac33 CH |
747 | static const struct mm_walk_ops smaps_walk_ops = { |
748 | .pmd_entry = smaps_pte_range, | |
749 | .hugetlb_entry = smaps_hugetlb_range, | |
750 | }; | |
751 | ||
752 | static const struct mm_walk_ops smaps_shmem_walk_ops = { | |
753 | .pmd_entry = smaps_pte_range, | |
754 | .hugetlb_entry = smaps_hugetlb_range, | |
755 | .pte_hole = smaps_pte_hole, | |
756 | }; | |
757 | ||
03b4b114 CC |
758 | /* |
759 | * Gather mem stats from @vma with the indicated beginning | |
760 | * address @start, and keep them in @mss. | |
761 | * | |
762 | * Use vm_start of @vma as the beginning address if @start is 0. | |
763 | */ | |
8e68d689 | 764 | static void smap_gather_stats(struct vm_area_struct *vma, |
03b4b114 | 765 | struct mem_size_stats *mss, unsigned long start) |
e070ad49 | 766 | { |
03b4b114 CC |
767 | const struct mm_walk_ops *ops = &smaps_walk_ops; |
768 | ||
769 | /* Invalid start */ | |
770 | if (start >= vma->vm_end) | |
771 | return; | |
772 | ||
c261e7d9 VB |
773 | #ifdef CONFIG_SHMEM |
774 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { | |
6a15a370 VB |
775 | /* |
776 | * For shared or readonly shmem mappings we know that all | |
777 | * swapped out pages belong to the shmem object, and we can | |
778 | * obtain the swap value much more efficiently. For private | |
779 | * writable mappings, we might have COW pages that are | |
780 | * not affected by the parent swapped out pages of the shmem | |
781 | * object, so we have to distinguish them during the page walk. | |
782 | * Unless we know that the shmem object (or the part mapped by | |
783 | * our VMA) has no swapped out pages at all. | |
784 | */ | |
785 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
786 | ||
03b4b114 CC |
787 | if (!start && (!shmem_swapped || (vma->vm_flags & VM_SHARED) || |
788 | !(vma->vm_flags & VM_WRITE))) { | |
fa76da46 | 789 | mss->swap += shmem_swapped; |
6a15a370 | 790 | } else { |
03b4b114 | 791 | ops = &smaps_shmem_walk_ops; |
6a15a370 | 792 | } |
c261e7d9 VB |
793 | } |
794 | #endif | |
c1e8d7c6 | 795 | /* mmap_lock is held in m_start */ |
03b4b114 CC |
796 | if (!start) |
797 | walk_page_vma(vma, ops, mss); | |
798 | else | |
799 | walk_page_range(vma->vm_mm, start, vma->vm_end, ops, mss); | |
8e68d689 VB |
800 | } |
801 | ||
802 | #define SEQ_PUT_DEC(str, val) \ | |
803 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) | |
f1547959 VB |
804 | |
805 | /* Show the contents common for smaps and smaps_rollup */ | |
ee2ad71b LS |
806 | static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss, |
807 | bool rollup_mode) | |
f1547959 VB |
808 | { |
809 | SEQ_PUT_DEC("Rss: ", mss->resident); | |
810 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); | |
ee2ad71b LS |
811 | if (rollup_mode) { |
812 | /* | |
813 | * These are meaningful only for smaps_rollup, otherwise two of | |
814 | * them are zero, and the other one is the same as Pss. | |
815 | */ | |
816 | SEQ_PUT_DEC(" kB\nPss_Anon: ", | |
817 | mss->pss_anon >> PSS_SHIFT); | |
818 | SEQ_PUT_DEC(" kB\nPss_File: ", | |
819 | mss->pss_file >> PSS_SHIFT); | |
820 | SEQ_PUT_DEC(" kB\nPss_Shmem: ", | |
821 | mss->pss_shmem >> PSS_SHIFT); | |
822 | } | |
f1547959 VB |
823 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); |
824 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); | |
825 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); | |
826 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); | |
827 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); | |
828 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); | |
829 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); | |
830 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); | |
831 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); | |
471e78cc | 832 | SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss->file_thp); |
f1547959 VB |
833 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); |
834 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", | |
835 | mss->private_hugetlb >> 10, 7); | |
836 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); | |
837 | SEQ_PUT_DEC(" kB\nSwapPss: ", | |
838 | mss->swap_pss >> PSS_SHIFT); | |
839 | SEQ_PUT_DEC(" kB\nLocked: ", | |
840 | mss->pss_locked >> PSS_SHIFT); | |
841 | seq_puts(m, " kB\n"); | |
842 | } | |
843 | ||
8e68d689 VB |
844 | static int show_smap(struct seq_file *m, void *v) |
845 | { | |
8e68d689 | 846 | struct vm_area_struct *vma = v; |
258f669e VB |
847 | struct mem_size_stats mss; |
848 | ||
849 | memset(&mss, 0, sizeof(mss)); | |
850 | ||
03b4b114 | 851 | smap_gather_stats(vma, &mss, 0); |
258f669e VB |
852 | |
853 | show_map_vma(m, vma); | |
854 | ||
855 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); | |
856 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); | |
857 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); | |
858 | seq_puts(m, " kB\n"); | |
859 | ||
ee2ad71b | 860 | __show_smap(m, &mss, false); |
258f669e | 861 | |
471e78cc | 862 | seq_printf(m, "THPeligible: %d\n", |
e6be37b2 | 863 | transparent_hugepage_active(vma)); |
7635d9cb | 864 | |
258f669e VB |
865 | if (arch_pkeys_enabled()) |
866 | seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); | |
867 | show_smap_vma_flags(m, vma); | |
868 | ||
258f669e VB |
869 | return 0; |
870 | } | |
871 | ||
872 | static int show_smaps_rollup(struct seq_file *m, void *v) | |
873 | { | |
874 | struct proc_maps_private *priv = m->private; | |
875 | struct mem_size_stats mss; | |
876 | struct mm_struct *mm; | |
877 | struct vm_area_struct *vma; | |
878 | unsigned long last_vma_end = 0; | |
8e68d689 | 879 | int ret = 0; |
8e68d689 | 880 | |
258f669e VB |
881 | priv->task = get_proc_task(priv->inode); |
882 | if (!priv->task) | |
883 | return -ESRCH; | |
493b0e9d | 884 | |
258f669e VB |
885 | mm = priv->mm; |
886 | if (!mm || !mmget_not_zero(mm)) { | |
887 | ret = -ESRCH; | |
888 | goto out_put_task; | |
493b0e9d | 889 | } |
4752c369 | 890 | |
258f669e | 891 | memset(&mss, 0, sizeof(mss)); |
493b0e9d | 892 | |
d8ed45c5 | 893 | ret = mmap_read_lock_killable(mm); |
a26a9781 KK |
894 | if (ret) |
895 | goto out_put_mm; | |
896 | ||
258f669e | 897 | hold_task_mempolicy(priv); |
f1547959 | 898 | |
ff9f47f6 | 899 | for (vma = priv->mm->mmap; vma;) { |
03b4b114 | 900 | smap_gather_stats(vma, &mss, 0); |
258f669e | 901 | last_vma_end = vma->vm_end; |
ff9f47f6 CC |
902 | |
903 | /* | |
904 | * Release mmap_lock temporarily if someone wants to | |
905 | * access it for write request. | |
906 | */ | |
907 | if (mmap_lock_is_contended(mm)) { | |
908 | mmap_read_unlock(mm); | |
909 | ret = mmap_read_lock_killable(mm); | |
910 | if (ret) { | |
911 | release_task_mempolicy(priv); | |
912 | goto out_put_mm; | |
913 | } | |
914 | ||
915 | /* | |
916 | * After dropping the lock, there are four cases to | |
917 | * consider. See the following example for explanation. | |
918 | * | |
919 | * +------+------+-----------+ | |
920 | * | VMA1 | VMA2 | VMA3 | | |
921 | * +------+------+-----------+ | |
922 | * | | | | | |
923 | * 4k 8k 16k 400k | |
924 | * | |
925 | * Suppose we drop the lock after reading VMA2 due to | |
926 | * contention, then we get: | |
927 | * | |
928 | * last_vma_end = 16k | |
929 | * | |
930 | * 1) VMA2 is freed, but VMA3 exists: | |
931 | * | |
932 | * find_vma(mm, 16k - 1) will return VMA3. | |
933 | * In this case, just continue from VMA3. | |
934 | * | |
935 | * 2) VMA2 still exists: | |
936 | * | |
937 | * find_vma(mm, 16k - 1) will return VMA2. | |
938 | * Iterate the loop like the original one. | |
939 | * | |
940 | * 3) No more VMAs can be found: | |
941 | * | |
942 | * find_vma(mm, 16k - 1) will return NULL. | |
943 | * No more things to do, just break. | |
944 | * | |
945 | * 4) (last_vma_end - 1) is the middle of a vma (VMA'): | |
946 | * | |
947 | * find_vma(mm, 16k - 1) will return VMA' whose range | |
948 | * contains last_vma_end. | |
949 | * Iterate VMA' from last_vma_end. | |
950 | */ | |
951 | vma = find_vma(mm, last_vma_end - 1); | |
952 | /* Case 3 above */ | |
953 | if (!vma) | |
954 | break; | |
955 | ||
956 | /* Case 1 above */ | |
957 | if (vma->vm_start >= last_vma_end) | |
958 | continue; | |
959 | ||
960 | /* Case 4 above */ | |
961 | if (vma->vm_end > last_vma_end) | |
962 | smap_gather_stats(vma, &mss, last_vma_end); | |
963 | } | |
964 | /* Case 2 above */ | |
965 | vma = vma->vm_next; | |
493b0e9d | 966 | } |
258f669e VB |
967 | |
968 | show_vma_header_prefix(m, priv->mm->mmap->vm_start, | |
969 | last_vma_end, 0, 0, 0, 0); | |
970 | seq_pad(m, ' '); | |
971 | seq_puts(m, "[rollup]\n"); | |
972 | ||
ee2ad71b | 973 | __show_smap(m, &mss, true); |
258f669e VB |
974 | |
975 | release_task_mempolicy(priv); | |
d8ed45c5 | 976 | mmap_read_unlock(mm); |
258f669e | 977 | |
a26a9781 KK |
978 | out_put_mm: |
979 | mmput(mm); | |
258f669e VB |
980 | out_put_task: |
981 | put_task_struct(priv->task); | |
982 | priv->task = NULL; | |
983 | ||
493b0e9d | 984 | return ret; |
e070ad49 | 985 | } |
d1be35cb | 986 | #undef SEQ_PUT_DEC |
e070ad49 | 987 | |
03a44825 | 988 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
989 | .start = m_start, |
990 | .next = m_next, | |
991 | .stop = m_stop, | |
871305bb | 992 | .show = show_smap |
a6198797 MM |
993 | }; |
994 | ||
b7643757 | 995 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
996 | { |
997 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
998 | } | |
999 | ||
258f669e | 1000 | static int smaps_rollup_open(struct inode *inode, struct file *file) |
493b0e9d | 1001 | { |
258f669e | 1002 | int ret; |
493b0e9d | 1003 | struct proc_maps_private *priv; |
258f669e VB |
1004 | |
1005 | priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); | |
1006 | if (!priv) | |
493b0e9d | 1007 | return -ENOMEM; |
258f669e VB |
1008 | |
1009 | ret = single_open(file, show_smaps_rollup, priv); | |
1010 | if (ret) | |
1011 | goto out_free; | |
1012 | ||
1013 | priv->inode = inode; | |
1014 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); | |
1015 | if (IS_ERR(priv->mm)) { | |
1016 | ret = PTR_ERR(priv->mm); | |
1017 | ||
1018 | single_release(inode, file); | |
1019 | goto out_free; | |
493b0e9d | 1020 | } |
258f669e | 1021 | |
493b0e9d | 1022 | return 0; |
258f669e VB |
1023 | |
1024 | out_free: | |
1025 | kfree(priv); | |
1026 | return ret; | |
1027 | } | |
1028 | ||
1029 | static int smaps_rollup_release(struct inode *inode, struct file *file) | |
1030 | { | |
1031 | struct seq_file *seq = file->private_data; | |
1032 | struct proc_maps_private *priv = seq->private; | |
1033 | ||
1034 | if (priv->mm) | |
1035 | mmdrop(priv->mm); | |
1036 | ||
1037 | kfree(priv); | |
1038 | return single_release(inode, file); | |
493b0e9d DC |
1039 | } |
1040 | ||
b7643757 SP |
1041 | const struct file_operations proc_pid_smaps_operations = { |
1042 | .open = pid_smaps_open, | |
1043 | .read = seq_read, | |
1044 | .llseek = seq_lseek, | |
29a40ace | 1045 | .release = proc_map_release, |
b7643757 SP |
1046 | }; |
1047 | ||
493b0e9d | 1048 | const struct file_operations proc_pid_smaps_rollup_operations = { |
258f669e | 1049 | .open = smaps_rollup_open, |
493b0e9d DC |
1050 | .read = seq_read, |
1051 | .llseek = seq_lseek, | |
258f669e | 1052 | .release = smaps_rollup_release, |
493b0e9d DC |
1053 | }; |
1054 | ||
040fa020 PE |
1055 | enum clear_refs_types { |
1056 | CLEAR_REFS_ALL = 1, | |
1057 | CLEAR_REFS_ANON, | |
1058 | CLEAR_REFS_MAPPED, | |
0f8975ec | 1059 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 1060 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
1061 | CLEAR_REFS_LAST, |
1062 | }; | |
1063 | ||
af9de7eb | 1064 | struct clear_refs_private { |
0f8975ec | 1065 | enum clear_refs_types type; |
af9de7eb PE |
1066 | }; |
1067 | ||
7d5b3bfa | 1068 | #ifdef CONFIG_MEM_SOFT_DIRTY |
9348b73c | 1069 | |
9348b73c LT |
1070 | static inline bool pte_is_pinned(struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
1071 | { | |
1072 | struct page *page; | |
1073 | ||
1074 | if (!pte_write(pte)) | |
1075 | return false; | |
1076 | if (!is_cow_mapping(vma->vm_flags)) | |
1077 | return false; | |
a458b76a | 1078 | if (likely(!test_bit(MMF_HAS_PINNED, &vma->vm_mm->flags))) |
9348b73c LT |
1079 | return false; |
1080 | page = vm_normal_page(vma, addr, pte); | |
1081 | if (!page) | |
1082 | return false; | |
1083 | return page_maybe_dma_pinned(page); | |
1084 | } | |
1085 | ||
0f8975ec PE |
1086 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
1087 | unsigned long addr, pte_t *pte) | |
1088 | { | |
0f8975ec PE |
1089 | /* |
1090 | * The soft-dirty tracker uses #PF-s to catch writes | |
1091 | * to pages, so write-protect the pte as well. See the | |
1ad1335d | 1092 | * Documentation/admin-guide/mm/soft-dirty.rst for full description |
0f8975ec PE |
1093 | * of how soft-dirty works. |
1094 | */ | |
1095 | pte_t ptent = *pte; | |
179ef71c CG |
1096 | |
1097 | if (pte_present(ptent)) { | |
04a86453 AK |
1098 | pte_t old_pte; |
1099 | ||
9348b73c LT |
1100 | if (pte_is_pinned(vma, addr, ptent)) |
1101 | return; | |
04a86453 AK |
1102 | old_pte = ptep_modify_prot_start(vma, addr, pte); |
1103 | ptent = pte_wrprotect(old_pte); | |
a7b76174 | 1104 | ptent = pte_clear_soft_dirty(ptent); |
04a86453 | 1105 | ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent); |
179ef71c CG |
1106 | } else if (is_swap_pte(ptent)) { |
1107 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 1108 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 1109 | } |
0f8975ec | 1110 | } |
5d3875a0 LD |
1111 | #else |
1112 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
1113 | unsigned long addr, pte_t *pte) | |
1114 | { | |
1115 | } | |
1116 | #endif | |
0f8975ec | 1117 | |
5d3875a0 | 1118 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
1119 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1120 | unsigned long addr, pmd_t *pmdp) | |
1121 | { | |
a3cf988f | 1122 | pmd_t old, pmd = *pmdp; |
5b7abeae | 1123 | |
ab6e3d09 NH |
1124 | if (pmd_present(pmd)) { |
1125 | /* See comment in change_huge_pmd() */ | |
a3cf988f KS |
1126 | old = pmdp_invalidate(vma, addr, pmdp); |
1127 | if (pmd_dirty(old)) | |
ab6e3d09 | 1128 | pmd = pmd_mkdirty(pmd); |
a3cf988f | 1129 | if (pmd_young(old)) |
ab6e3d09 NH |
1130 | pmd = pmd_mkyoung(pmd); |
1131 | ||
1132 | pmd = pmd_wrprotect(pmd); | |
1133 | pmd = pmd_clear_soft_dirty(pmd); | |
1134 | ||
1135 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1136 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
1137 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
1138 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1139 | } | |
7d5b3bfa | 1140 | } |
7d5b3bfa | 1141 | #else |
7d5b3bfa KS |
1142 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1143 | unsigned long addr, pmd_t *pmdp) | |
1144 | { | |
1145 | } | |
1146 | #endif | |
1147 | ||
a6198797 | 1148 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1149 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1150 | { |
af9de7eb | 1151 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1152 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1153 | pte_t *pte, ptent; |
1154 | spinlock_t *ptl; | |
1155 | struct page *page; | |
1156 | ||
b6ec57f4 KS |
1157 | ptl = pmd_trans_huge_lock(pmd, vma); |
1158 | if (ptl) { | |
7d5b3bfa KS |
1159 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1160 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1161 | goto out; | |
1162 | } | |
1163 | ||
84c3fc4e ZY |
1164 | if (!pmd_present(*pmd)) |
1165 | goto out; | |
1166 | ||
7d5b3bfa KS |
1167 | page = pmd_page(*pmd); |
1168 | ||
1169 | /* Clear accessed and referenced bits. */ | |
1170 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1171 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1172 | ClearPageReferenced(page); |
1173 | out: | |
1174 | spin_unlock(ptl); | |
1175 | return 0; | |
1176 | } | |
1177 | ||
1a5a9906 AA |
1178 | if (pmd_trans_unstable(pmd)) |
1179 | return 0; | |
03319327 | 1180 | |
a6198797 MM |
1181 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1182 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1183 | ptent = *pte; | |
a6198797 | 1184 | |
0f8975ec PE |
1185 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1186 | clear_soft_dirty(vma, addr, pte); | |
1187 | continue; | |
1188 | } | |
1189 | ||
179ef71c CG |
1190 | if (!pte_present(ptent)) |
1191 | continue; | |
1192 | ||
a6198797 MM |
1193 | page = vm_normal_page(vma, addr, ptent); |
1194 | if (!page) | |
1195 | continue; | |
1196 | ||
1197 | /* Clear accessed and referenced bits. */ | |
1198 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1199 | test_and_clear_page_young(page); |
a6198797 MM |
1200 | ClearPageReferenced(page); |
1201 | } | |
1202 | pte_unmap_unlock(pte - 1, ptl); | |
1203 | cond_resched(); | |
1204 | return 0; | |
1205 | } | |
1206 | ||
5c64f52a NH |
1207 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1208 | struct mm_walk *walk) | |
1209 | { | |
1210 | struct clear_refs_private *cp = walk->private; | |
1211 | struct vm_area_struct *vma = walk->vma; | |
1212 | ||
48684a65 NH |
1213 | if (vma->vm_flags & VM_PFNMAP) |
1214 | return 1; | |
1215 | ||
5c64f52a NH |
1216 | /* |
1217 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1218 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1219 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1220 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1221 | */ | |
1222 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1223 | return 1; | |
1224 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1225 | return 1; | |
1226 | return 0; | |
1227 | } | |
1228 | ||
7b86ac33 CH |
1229 | static const struct mm_walk_ops clear_refs_walk_ops = { |
1230 | .pmd_entry = clear_refs_pte_range, | |
1231 | .test_walk = clear_refs_test_walk, | |
1232 | }; | |
1233 | ||
f248dcb3 MM |
1234 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1235 | size_t count, loff_t *ppos) | |
b813e931 | 1236 | { |
f248dcb3 | 1237 | struct task_struct *task; |
fb92a4b0 | 1238 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1239 | struct mm_struct *mm; |
b813e931 | 1240 | struct vm_area_struct *vma; |
040fa020 PE |
1241 | enum clear_refs_types type; |
1242 | int itype; | |
0a8cb8e3 | 1243 | int rv; |
b813e931 | 1244 | |
f248dcb3 MM |
1245 | memset(buffer, 0, sizeof(buffer)); |
1246 | if (count > sizeof(buffer) - 1) | |
1247 | count = sizeof(buffer) - 1; | |
1248 | if (copy_from_user(buffer, buf, count)) | |
1249 | return -EFAULT; | |
040fa020 | 1250 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1251 | if (rv < 0) |
1252 | return rv; | |
040fa020 PE |
1253 | type = (enum clear_refs_types)itype; |
1254 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1255 | return -EINVAL; |
541c237c | 1256 | |
496ad9aa | 1257 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1258 | if (!task) |
1259 | return -ESRCH; | |
1260 | mm = get_task_mm(task); | |
1261 | if (mm) { | |
ac46d4f3 | 1262 | struct mmu_notifier_range range; |
af9de7eb | 1263 | struct clear_refs_private cp = { |
0f8975ec | 1264 | .type = type, |
af9de7eb | 1265 | }; |
695f0559 | 1266 | |
29a951df LT |
1267 | if (mmap_write_lock_killable(mm)) { |
1268 | count = -EINTR; | |
1269 | goto out_mm; | |
1270 | } | |
695f0559 PC |
1271 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { |
1272 | /* | |
1273 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1274 | * resident set size to this mm's current rss value. | |
1275 | */ | |
695f0559 | 1276 | reset_mm_hiwater_rss(mm); |
29a951df | 1277 | goto out_unlock; |
695f0559 PC |
1278 | } |
1279 | ||
64e45507 PF |
1280 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1281 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1282 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1283 | continue; | |
29a951df LT |
1284 | vma->vm_flags &= ~VM_SOFTDIRTY; |
1285 | vma_set_page_prot(vma); | |
64e45507 | 1286 | } |
ac46d4f3 | 1287 | |
912efa17 | 1288 | inc_tlb_flush_pending(mm); |
7269f999 JG |
1289 | mmu_notifier_range_init(&range, MMU_NOTIFY_SOFT_DIRTY, |
1290 | 0, NULL, mm, 0, -1UL); | |
ac46d4f3 | 1291 | mmu_notifier_invalidate_range_start(&range); |
64e45507 | 1292 | } |
7b86ac33 CH |
1293 | walk_page_range(mm, 0, mm->highest_vm_end, &clear_refs_walk_ops, |
1294 | &cp); | |
912efa17 | 1295 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
ac46d4f3 | 1296 | mmu_notifier_invalidate_range_end(&range); |
912efa17 WD |
1297 | flush_tlb_mm(mm); |
1298 | dec_tlb_flush_pending(mm); | |
1299 | } | |
29a951df LT |
1300 | out_unlock: |
1301 | mmap_write_unlock(mm); | |
695f0559 | 1302 | out_mm: |
f248dcb3 MM |
1303 | mmput(mm); |
1304 | } | |
1305 | put_task_struct(task); | |
fb92a4b0 VL |
1306 | |
1307 | return count; | |
b813e931 DR |
1308 | } |
1309 | ||
f248dcb3 MM |
1310 | const struct file_operations proc_clear_refs_operations = { |
1311 | .write = clear_refs_write, | |
6038f373 | 1312 | .llseek = noop_llseek, |
f248dcb3 MM |
1313 | }; |
1314 | ||
092b50ba NH |
1315 | typedef struct { |
1316 | u64 pme; | |
1317 | } pagemap_entry_t; | |
1318 | ||
85863e47 | 1319 | struct pagemapread { |
8c829622 | 1320 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1321 | pagemap_entry_t *buffer; |
1c90308e | 1322 | bool show_pfn; |
85863e47 MM |
1323 | }; |
1324 | ||
5aaabe83 NH |
1325 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1326 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1327 | ||
deb94544 KK |
1328 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1329 | #define PM_PFRAME_BITS 55 | |
1330 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1331 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1332 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
fb8e37f3 | 1333 | #define PM_UFFD_WP BIT_ULL(57) |
deb94544 KK |
1334 | #define PM_FILE BIT_ULL(61) |
1335 | #define PM_SWAP BIT_ULL(62) | |
1336 | #define PM_PRESENT BIT_ULL(63) | |
1337 | ||
85863e47 MM |
1338 | #define PM_END_OF_BUFFER 1 |
1339 | ||
deb94544 | 1340 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1341 | { |
deb94544 | 1342 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1343 | } |
1344 | ||
1345 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1346 | struct pagemapread *pm) |
1347 | { | |
092b50ba | 1348 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1349 | if (pm->pos >= pm->len) |
aae8679b | 1350 | return PM_END_OF_BUFFER; |
85863e47 MM |
1351 | return 0; |
1352 | } | |
1353 | ||
1354 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
b7a16c7a | 1355 | __always_unused int depth, struct mm_walk *walk) |
85863e47 | 1356 | { |
2165009b | 1357 | struct pagemapread *pm = walk->private; |
68b5a652 | 1358 | unsigned long addr = start; |
85863e47 | 1359 | int err = 0; |
092b50ba | 1360 | |
68b5a652 PF |
1361 | while (addr < end) { |
1362 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1363 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1364 | /* End of address space hole, which we mark as non-present. */ |
1365 | unsigned long hole_end; | |
68b5a652 | 1366 | |
87e6d49a PF |
1367 | if (vma) |
1368 | hole_end = min(end, vma->vm_start); | |
1369 | else | |
1370 | hole_end = end; | |
1371 | ||
1372 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1373 | err = add_to_pagemap(addr, &pme, pm); | |
1374 | if (err) | |
1375 | goto out; | |
68b5a652 PF |
1376 | } |
1377 | ||
87e6d49a PF |
1378 | if (!vma) |
1379 | break; | |
1380 | ||
1381 | /* Addresses in the VMA. */ | |
1382 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1383 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1384 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1385 | err = add_to_pagemap(addr, &pme, pm); |
1386 | if (err) | |
1387 | goto out; | |
1388 | } | |
85863e47 | 1389 | } |
68b5a652 | 1390 | out: |
85863e47 MM |
1391 | return err; |
1392 | } | |
1393 | ||
deb94544 | 1394 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1395 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1396 | { |
deb94544 | 1397 | u64 frame = 0, flags = 0; |
052fb0d6 | 1398 | struct page *page = NULL; |
24d7275c | 1399 | bool migration = false; |
85863e47 | 1400 | |
052fb0d6 | 1401 | if (pte_present(pte)) { |
1c90308e KK |
1402 | if (pm->show_pfn) |
1403 | frame = pte_pfn(pte); | |
deb94544 | 1404 | flags |= PM_PRESENT; |
25b2995a | 1405 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1406 | if (pte_soft_dirty(pte)) |
deb94544 | 1407 | flags |= PM_SOFT_DIRTY; |
fb8e37f3 PX |
1408 | if (pte_uffd_wp(pte)) |
1409 | flags |= PM_UFFD_WP; | |
052fb0d6 | 1410 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1411 | swp_entry_t entry; |
1412 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1413 | flags |= PM_SOFT_DIRTY; |
fb8e37f3 PX |
1414 | if (pte_swp_uffd_wp(pte)) |
1415 | flags |= PM_UFFD_WP; | |
179ef71c | 1416 | entry = pte_to_swp_entry(pte); |
ab6ecf24 HY |
1417 | if (pm->show_pfn) |
1418 | frame = swp_type(entry) | | |
1419 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1420 | flags |= PM_SWAP; |
24d7275c | 1421 | migration = is_migration_entry(entry); |
af5cdaf8 AP |
1422 | if (is_pfn_swap_entry(entry)) |
1423 | page = pfn_swap_entry_to_page(entry); | |
052fb0d6 KK |
1424 | } |
1425 | ||
1426 | if (page && !PageAnon(page)) | |
1427 | flags |= PM_FILE; | |
24d7275c | 1428 | if (page && !migration && page_mapcount(page) == 1) |
77bb499b | 1429 | flags |= PM_MMAP_EXCLUSIVE; |
deb94544 KK |
1430 | if (vma->vm_flags & VM_SOFTDIRTY) |
1431 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1432 | |
deb94544 | 1433 | return make_pme(frame, flags); |
bcf8039e DH |
1434 | } |
1435 | ||
356515e7 | 1436 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1437 | struct mm_walk *walk) |
85863e47 | 1438 | { |
f995ece2 | 1439 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1440 | struct pagemapread *pm = walk->private; |
bf929152 | 1441 | spinlock_t *ptl; |
05fbf357 | 1442 | pte_t *pte, *orig_pte; |
85863e47 | 1443 | int err = 0; |
356515e7 | 1444 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
24d7275c YS |
1445 | bool migration = false; |
1446 | ||
b6ec57f4 KS |
1447 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1448 | if (ptl) { | |
356515e7 KK |
1449 | u64 flags = 0, frame = 0; |
1450 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1451 | struct page *page = NULL; |
0f8975ec | 1452 | |
b83d7e43 | 1453 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1454 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1455 | |
356515e7 | 1456 | if (pmd_present(pmd)) { |
84c3fc4e | 1457 | page = pmd_page(pmd); |
77bb499b | 1458 | |
356515e7 | 1459 | flags |= PM_PRESENT; |
b83d7e43 HY |
1460 | if (pmd_soft_dirty(pmd)) |
1461 | flags |= PM_SOFT_DIRTY; | |
fb8e37f3 PX |
1462 | if (pmd_uffd_wp(pmd)) |
1463 | flags |= PM_UFFD_WP; | |
1c90308e KK |
1464 | if (pm->show_pfn) |
1465 | frame = pmd_pfn(pmd) + | |
1466 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1467 | } |
84c3fc4e ZY |
1468 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1469 | else if (is_swap_pmd(pmd)) { | |
1470 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
ab6ecf24 | 1471 | unsigned long offset; |
84c3fc4e | 1472 | |
ab6ecf24 HY |
1473 | if (pm->show_pfn) { |
1474 | offset = swp_offset(entry) + | |
1475 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
1476 | frame = swp_type(entry) | | |
1477 | (offset << MAX_SWAPFILES_SHIFT); | |
1478 | } | |
84c3fc4e | 1479 | flags |= PM_SWAP; |
b83d7e43 HY |
1480 | if (pmd_swp_soft_dirty(pmd)) |
1481 | flags |= PM_SOFT_DIRTY; | |
fb8e37f3 PX |
1482 | if (pmd_swp_uffd_wp(pmd)) |
1483 | flags |= PM_UFFD_WP; | |
84c3fc4e | 1484 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
24d7275c | 1485 | migration = is_migration_entry(entry); |
af5cdaf8 | 1486 | page = pfn_swap_entry_to_page(entry); |
84c3fc4e ZY |
1487 | } |
1488 | #endif | |
1489 | ||
24d7275c | 1490 | if (page && !migration && page_mapcount(page) == 1) |
84c3fc4e | 1491 | flags |= PM_MMAP_EXCLUSIVE; |
356515e7 | 1492 | |
025c5b24 | 1493 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1494 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1495 | |
092b50ba | 1496 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1497 | if (err) |
1498 | break; | |
ab6ecf24 HY |
1499 | if (pm->show_pfn) { |
1500 | if (flags & PM_PRESENT) | |
1501 | frame++; | |
1502 | else if (flags & PM_SWAP) | |
1503 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
1504 | } | |
5aaabe83 | 1505 | } |
bf929152 | 1506 | spin_unlock(ptl); |
025c5b24 | 1507 | return err; |
5aaabe83 NH |
1508 | } |
1509 | ||
356515e7 | 1510 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1511 | return 0; |
356515e7 | 1512 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1513 | |
f995ece2 NH |
1514 | /* |
1515 | * We can assume that @vma always points to a valid one and @end never | |
1516 | * goes beyond vma->vm_end. | |
1517 | */ | |
356515e7 | 1518 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1519 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1520 | pagemap_entry_t pme; | |
05fbf357 | 1521 | |
deb94544 | 1522 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1523 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1524 | if (err) |
81d0fa62 | 1525 | break; |
85863e47 | 1526 | } |
f995ece2 | 1527 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1528 | |
1529 | cond_resched(); | |
1530 | ||
1531 | return err; | |
1532 | } | |
1533 | ||
1a5cb814 | 1534 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1535 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1536 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1537 | unsigned long addr, unsigned long end, |
1538 | struct mm_walk *walk) | |
5dc37642 | 1539 | { |
5dc37642 | 1540 | struct pagemapread *pm = walk->private; |
f995ece2 | 1541 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1542 | u64 flags = 0, frame = 0; |
5dc37642 | 1543 | int err = 0; |
356515e7 | 1544 | pte_t pte; |
5dc37642 | 1545 | |
f995ece2 | 1546 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1547 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1548 | |
356515e7 KK |
1549 | pte = huge_ptep_get(ptep); |
1550 | if (pte_present(pte)) { | |
1551 | struct page *page = pte_page(pte); | |
1552 | ||
1553 | if (!PageAnon(page)) | |
1554 | flags |= PM_FILE; | |
1555 | ||
77bb499b KK |
1556 | if (page_mapcount(page) == 1) |
1557 | flags |= PM_MMAP_EXCLUSIVE; | |
1558 | ||
356515e7 | 1559 | flags |= PM_PRESENT; |
1c90308e KK |
1560 | if (pm->show_pfn) |
1561 | frame = pte_pfn(pte) + | |
1562 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1563 | } |
1564 | ||
5dc37642 | 1565 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1566 | pagemap_entry_t pme = make_pme(frame, flags); |
1567 | ||
092b50ba | 1568 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1569 | if (err) |
1570 | return err; | |
1c90308e | 1571 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1572 | frame++; |
5dc37642 NH |
1573 | } |
1574 | ||
1575 | cond_resched(); | |
1576 | ||
1577 | return err; | |
1578 | } | |
7b86ac33 CH |
1579 | #else |
1580 | #define pagemap_hugetlb_range NULL | |
1a5cb814 | 1581 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1582 | |
7b86ac33 CH |
1583 | static const struct mm_walk_ops pagemap_ops = { |
1584 | .pmd_entry = pagemap_pmd_range, | |
1585 | .pte_hole = pagemap_pte_hole, | |
1586 | .hugetlb_entry = pagemap_hugetlb_range, | |
1587 | }; | |
1588 | ||
85863e47 MM |
1589 | /* |
1590 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1591 | * | |
f16278c6 HR |
1592 | * For each page in the address space, this file contains one 64-bit entry |
1593 | * consisting of the following: | |
1594 | * | |
052fb0d6 | 1595 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1596 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1597 | * Bits 5-54 swap offset if swapped |
1ad1335d | 1598 | * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) |
77bb499b | 1599 | * Bit 56 page exclusively mapped |
dd21bfa4 YZ |
1600 | * Bit 57 pte is uffd-wp write-protected |
1601 | * Bits 58-60 zero | |
052fb0d6 | 1602 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1603 | * Bit 62 page swapped |
1604 | * Bit 63 page present | |
1605 | * | |
1606 | * If the page is not present but in swap, then the PFN contains an | |
1607 | * encoding of the swap file number and the page's offset into the | |
1608 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1609 | * precisely which pages are mapped (or in swap) and comparing mapped |
1610 | * pages between processes. | |
1611 | * | |
1612 | * Efficient users of this interface will use /proc/pid/maps to | |
1613 | * determine which areas of memory are actually mapped and llseek to | |
1614 | * skip over unmapped regions. | |
1615 | */ | |
1616 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1617 | size_t count, loff_t *ppos) | |
1618 | { | |
a06db751 | 1619 | struct mm_struct *mm = file->private_data; |
85863e47 | 1620 | struct pagemapread pm; |
5d7e0d2b AM |
1621 | unsigned long src; |
1622 | unsigned long svpfn; | |
1623 | unsigned long start_vaddr; | |
1624 | unsigned long end_vaddr; | |
a06db751 | 1625 | int ret = 0, copied = 0; |
85863e47 | 1626 | |
388f7934 | 1627 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1628 | goto out; |
1629 | ||
85863e47 MM |
1630 | ret = -EINVAL; |
1631 | /* file position must be aligned */ | |
aae8679b | 1632 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1633 | goto out_mm; |
85863e47 MM |
1634 | |
1635 | ret = 0; | |
08161786 | 1636 | if (!count) |
a06db751 | 1637 | goto out_mm; |
08161786 | 1638 | |
1c90308e KK |
1639 | /* do not disclose physical addresses: attack vector */ |
1640 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1641 | ||
8c829622 | 1642 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
6da2ec56 | 1643 | pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1644 | ret = -ENOMEM; |
d82ef020 | 1645 | if (!pm.buffer) |
a06db751 | 1646 | goto out_mm; |
85863e47 | 1647 | |
5d7e0d2b AM |
1648 | src = *ppos; |
1649 | svpfn = src / PM_ENTRY_BYTES; | |
a06db751 | 1650 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1651 | |
1652 | /* watch out for wraparound */ | |
40d6366e MC |
1653 | start_vaddr = end_vaddr; |
1654 | if (svpfn <= (ULONG_MAX >> PAGE_SHIFT)) | |
1655 | start_vaddr = untagged_addr(svpfn << PAGE_SHIFT); | |
1656 | ||
1657 | /* Ensure the address is inside the task */ | |
1658 | if (start_vaddr > mm->task_size) | |
5d7e0d2b AM |
1659 | start_vaddr = end_vaddr; |
1660 | ||
1661 | /* | |
1662 | * The odds are that this will stop walking way | |
1663 | * before end_vaddr, because the length of the | |
1664 | * user buffer is tracked in "pm", and the walk | |
1665 | * will stop when we hit the end of the buffer. | |
1666 | */ | |
d82ef020 KH |
1667 | ret = 0; |
1668 | while (count && (start_vaddr < end_vaddr)) { | |
1669 | int len; | |
1670 | unsigned long end; | |
1671 | ||
1672 | pm.pos = 0; | |
ea251c1d | 1673 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1674 | /* overflow ? */ |
1675 | if (end < start_vaddr || end > end_vaddr) | |
1676 | end = end_vaddr; | |
d8ed45c5 | 1677 | ret = mmap_read_lock_killable(mm); |
ad80b932 KK |
1678 | if (ret) |
1679 | goto out_free; | |
7b86ac33 | 1680 | ret = walk_page_range(mm, start_vaddr, end, &pagemap_ops, &pm); |
d8ed45c5 | 1681 | mmap_read_unlock(mm); |
d82ef020 KH |
1682 | start_vaddr = end; |
1683 | ||
1684 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1685 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1686 | ret = -EFAULT; |
a06db751 | 1687 | goto out_free; |
d82ef020 KH |
1688 | } |
1689 | copied += len; | |
1690 | buf += len; | |
1691 | count -= len; | |
85863e47 | 1692 | } |
d82ef020 KH |
1693 | *ppos += copied; |
1694 | if (!ret || ret == PM_END_OF_BUFFER) | |
1695 | ret = copied; | |
1696 | ||
98bc93e5 KM |
1697 | out_free: |
1698 | kfree(pm.buffer); | |
a06db751 KK |
1699 | out_mm: |
1700 | mmput(mm); | |
85863e47 MM |
1701 | out: |
1702 | return ret; | |
1703 | } | |
1704 | ||
541c237c PE |
1705 | static int pagemap_open(struct inode *inode, struct file *file) |
1706 | { | |
a06db751 KK |
1707 | struct mm_struct *mm; |
1708 | ||
a06db751 KK |
1709 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1710 | if (IS_ERR(mm)) | |
1711 | return PTR_ERR(mm); | |
1712 | file->private_data = mm; | |
1713 | return 0; | |
1714 | } | |
1715 | ||
1716 | static int pagemap_release(struct inode *inode, struct file *file) | |
1717 | { | |
1718 | struct mm_struct *mm = file->private_data; | |
1719 | ||
1720 | if (mm) | |
1721 | mmdrop(mm); | |
541c237c PE |
1722 | return 0; |
1723 | } | |
1724 | ||
85863e47 MM |
1725 | const struct file_operations proc_pagemap_operations = { |
1726 | .llseek = mem_lseek, /* borrow this */ | |
1727 | .read = pagemap_read, | |
541c237c | 1728 | .open = pagemap_open, |
a06db751 | 1729 | .release = pagemap_release, |
85863e47 | 1730 | }; |
1e883281 | 1731 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1732 | |
6e21c8f1 | 1733 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1734 | |
f69ff943 | 1735 | struct numa_maps { |
f69ff943 SW |
1736 | unsigned long pages; |
1737 | unsigned long anon; | |
1738 | unsigned long active; | |
1739 | unsigned long writeback; | |
1740 | unsigned long mapcount_max; | |
1741 | unsigned long dirty; | |
1742 | unsigned long swapcache; | |
1743 | unsigned long node[MAX_NUMNODES]; | |
1744 | }; | |
1745 | ||
5b52fc89 SW |
1746 | struct numa_maps_private { |
1747 | struct proc_maps_private proc_maps; | |
1748 | struct numa_maps md; | |
1749 | }; | |
1750 | ||
eb4866d0 DH |
1751 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1752 | unsigned long nr_pages) | |
f69ff943 SW |
1753 | { |
1754 | int count = page_mapcount(page); | |
1755 | ||
eb4866d0 | 1756 | md->pages += nr_pages; |
f69ff943 | 1757 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1758 | md->dirty += nr_pages; |
f69ff943 SW |
1759 | |
1760 | if (PageSwapCache(page)) | |
eb4866d0 | 1761 | md->swapcache += nr_pages; |
f69ff943 SW |
1762 | |
1763 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1764 | md->active += nr_pages; |
f69ff943 SW |
1765 | |
1766 | if (PageWriteback(page)) | |
eb4866d0 | 1767 | md->writeback += nr_pages; |
f69ff943 SW |
1768 | |
1769 | if (PageAnon(page)) | |
eb4866d0 | 1770 | md->anon += nr_pages; |
f69ff943 SW |
1771 | |
1772 | if (count > md->mapcount_max) | |
1773 | md->mapcount_max = count; | |
1774 | ||
eb4866d0 | 1775 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1776 | } |
1777 | ||
3200a8aa DH |
1778 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1779 | unsigned long addr) | |
1780 | { | |
1781 | struct page *page; | |
1782 | int nid; | |
1783 | ||
1784 | if (!pte_present(pte)) | |
1785 | return NULL; | |
1786 | ||
1787 | page = vm_normal_page(vma, addr, pte); | |
1788 | if (!page) | |
1789 | return NULL; | |
1790 | ||
1791 | if (PageReserved(page)) | |
1792 | return NULL; | |
1793 | ||
1794 | nid = page_to_nid(page); | |
4ff1b2c2 | 1795 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1796 | return NULL; |
1797 | ||
1798 | return page; | |
1799 | } | |
1800 | ||
28093f9f GS |
1801 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1802 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1803 | struct vm_area_struct *vma, | |
1804 | unsigned long addr) | |
1805 | { | |
1806 | struct page *page; | |
1807 | int nid; | |
1808 | ||
1809 | if (!pmd_present(pmd)) | |
1810 | return NULL; | |
1811 | ||
1812 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1813 | if (!page) | |
1814 | return NULL; | |
1815 | ||
1816 | if (PageReserved(page)) | |
1817 | return NULL; | |
1818 | ||
1819 | nid = page_to_nid(page); | |
1820 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1821 | return NULL; | |
1822 | ||
1823 | return page; | |
1824 | } | |
1825 | #endif | |
1826 | ||
f69ff943 SW |
1827 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1828 | unsigned long end, struct mm_walk *walk) | |
1829 | { | |
d85f4d6d NH |
1830 | struct numa_maps *md = walk->private; |
1831 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1832 | spinlock_t *ptl; |
1833 | pte_t *orig_pte; | |
1834 | pte_t *pte; | |
1835 | ||
28093f9f | 1836 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1837 | ptl = pmd_trans_huge_lock(pmd, vma); |
1838 | if (ptl) { | |
025c5b24 NH |
1839 | struct page *page; |
1840 | ||
28093f9f | 1841 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1842 | if (page) |
28093f9f | 1843 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1844 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1845 | spin_unlock(ptl); |
025c5b24 | 1846 | return 0; |
32ef4384 DH |
1847 | } |
1848 | ||
1a5a9906 AA |
1849 | if (pmd_trans_unstable(pmd)) |
1850 | return 0; | |
28093f9f | 1851 | #endif |
f69ff943 SW |
1852 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1853 | do { | |
d85f4d6d | 1854 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1855 | if (!page) |
1856 | continue; | |
eb4866d0 | 1857 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1858 | |
1859 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1860 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1861 | cond_resched(); |
f69ff943 SW |
1862 | return 0; |
1863 | } | |
1864 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1865 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1866 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1867 | { | |
5c2ff95e | 1868 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1869 | struct numa_maps *md; |
1870 | struct page *page; | |
1871 | ||
5c2ff95e | 1872 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1873 | return 0; |
1874 | ||
5c2ff95e | 1875 | page = pte_page(huge_pte); |
f69ff943 SW |
1876 | |
1877 | md = walk->private; | |
5c2ff95e | 1878 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1879 | return 0; |
1880 | } | |
1881 | ||
1882 | #else | |
632fd60f | 1883 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1884 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1885 | { | |
1886 | return 0; | |
1887 | } | |
1888 | #endif | |
1889 | ||
7b86ac33 CH |
1890 | static const struct mm_walk_ops show_numa_ops = { |
1891 | .hugetlb_entry = gather_hugetlb_stats, | |
1892 | .pmd_entry = gather_pte_stats, | |
1893 | }; | |
1894 | ||
f69ff943 SW |
1895 | /* |
1896 | * Display pages allocated per node and memory policy via /proc. | |
1897 | */ | |
871305bb | 1898 | static int show_numa_map(struct seq_file *m, void *v) |
f69ff943 | 1899 | { |
5b52fc89 SW |
1900 | struct numa_maps_private *numa_priv = m->private; |
1901 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1902 | struct vm_area_struct *vma = v; |
5b52fc89 | 1903 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1904 | struct file *file = vma->vm_file; |
1905 | struct mm_struct *mm = vma->vm_mm; | |
f69ff943 | 1906 | struct mempolicy *pol; |
948927ee DR |
1907 | char buffer[64]; |
1908 | int nid; | |
f69ff943 SW |
1909 | |
1910 | if (!mm) | |
1911 | return 0; | |
1912 | ||
5b52fc89 SW |
1913 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1914 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1915 | |
498f2371 ON |
1916 | pol = __get_vma_policy(vma, vma->vm_start); |
1917 | if (pol) { | |
1918 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1919 | mpol_cond_put(pol); | |
1920 | } else { | |
1921 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1922 | } | |
f69ff943 SW |
1923 | |
1924 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1925 | ||
1926 | if (file) { | |
17c2b4ee | 1927 | seq_puts(m, " file="); |
2726d566 | 1928 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1929 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1930 | seq_puts(m, " heap"); |
1240ea0d | 1931 | } else if (is_stack(vma)) { |
65376df5 | 1932 | seq_puts(m, " stack"); |
f69ff943 SW |
1933 | } |
1934 | ||
fc360bd9 | 1935 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1936 | seq_puts(m, " huge"); |
fc360bd9 | 1937 | |
c1e8d7c6 | 1938 | /* mmap_lock is held by m_start */ |
7b86ac33 | 1939 | walk_page_vma(vma, &show_numa_ops, md); |
f69ff943 SW |
1940 | |
1941 | if (!md->pages) | |
1942 | goto out; | |
1943 | ||
1944 | if (md->anon) | |
1945 | seq_printf(m, " anon=%lu", md->anon); | |
1946 | ||
1947 | if (md->dirty) | |
1948 | seq_printf(m, " dirty=%lu", md->dirty); | |
1949 | ||
1950 | if (md->pages != md->anon && md->pages != md->dirty) | |
1951 | seq_printf(m, " mapped=%lu", md->pages); | |
1952 | ||
1953 | if (md->mapcount_max > 1) | |
1954 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1955 | ||
1956 | if (md->swapcache) | |
1957 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1958 | ||
1959 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1960 | seq_printf(m, " active=%lu", md->active); | |
1961 | ||
1962 | if (md->writeback) | |
1963 | seq_printf(m, " writeback=%lu", md->writeback); | |
1964 | ||
948927ee DR |
1965 | for_each_node_state(nid, N_MEMORY) |
1966 | if (md->node[nid]) | |
1967 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1968 | |
1969 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1970 | out: |
1971 | seq_putc(m, '\n'); | |
f69ff943 SW |
1972 | return 0; |
1973 | } | |
5b52fc89 | 1974 | |
03a44825 | 1975 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1976 | .start = m_start, |
1977 | .next = m_next, | |
1978 | .stop = m_stop, | |
871305bb | 1979 | .show = show_numa_map, |
6e21c8f1 | 1980 | }; |
662795de | 1981 | |
b7643757 SP |
1982 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1983 | { | |
871305bb VB |
1984 | return proc_maps_open(inode, file, &proc_pid_numa_maps_op, |
1985 | sizeof(struct numa_maps_private)); | |
b7643757 SP |
1986 | } |
1987 | ||
1988 | const struct file_operations proc_pid_numa_maps_operations = { | |
1989 | .open = pid_numa_maps_open, | |
1990 | .read = seq_read, | |
1991 | .llseek = seq_lseek, | |
29a40ace | 1992 | .release = proc_map_release, |
b7643757 SP |
1993 | }; |
1994 | ||
f69ff943 | 1995 | #endif /* CONFIG_NUMA */ |