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Merge tag 'dm-4.8-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device...
[deliverable/linux.git] / fs / proc / task_mmu.c
1 #include <linux/mm.h>
2 #include <linux/vmacache.h>
3 #include <linux/hugetlb.h>
4 #include <linux/huge_mm.h>
5 #include <linux/mount.h>
6 #include <linux/seq_file.h>
7 #include <linux/highmem.h>
8 #include <linux/ptrace.h>
9 #include <linux/slab.h>
10 #include <linux/pagemap.h>
11 #include <linux/mempolicy.h>
12 #include <linux/rmap.h>
13 #include <linux/swap.h>
14 #include <linux/swapops.h>
15 #include <linux/mmu_notifier.h>
16 #include <linux/page_idle.h>
17 #include <linux/shmem_fs.h>
18
19 #include <asm/elf.h>
20 #include <asm/uaccess.h>
21 #include <asm/tlbflush.h>
22 #include "internal.h"
23
24 void task_mem(struct seq_file *m, struct mm_struct *mm)
25 {
26 unsigned long text, lib, swap, ptes, pmds, anon, file, shmem;
27 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
28
29 anon = get_mm_counter(mm, MM_ANONPAGES);
30 file = get_mm_counter(mm, MM_FILEPAGES);
31 shmem = get_mm_counter(mm, MM_SHMEMPAGES);
32
33 /*
34 * Note: to minimize their overhead, mm maintains hiwater_vm and
35 * hiwater_rss only when about to *lower* total_vm or rss. Any
36 * collector of these hiwater stats must therefore get total_vm
37 * and rss too, which will usually be the higher. Barriers? not
38 * worth the effort, such snapshots can always be inconsistent.
39 */
40 hiwater_vm = total_vm = mm->total_vm;
41 if (hiwater_vm < mm->hiwater_vm)
42 hiwater_vm = mm->hiwater_vm;
43 hiwater_rss = total_rss = anon + file + shmem;
44 if (hiwater_rss < mm->hiwater_rss)
45 hiwater_rss = mm->hiwater_rss;
46
47 text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
48 lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
49 swap = get_mm_counter(mm, MM_SWAPENTS);
50 ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
51 pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
52 seq_printf(m,
53 "VmPeak:\t%8lu kB\n"
54 "VmSize:\t%8lu kB\n"
55 "VmLck:\t%8lu kB\n"
56 "VmPin:\t%8lu kB\n"
57 "VmHWM:\t%8lu kB\n"
58 "VmRSS:\t%8lu kB\n"
59 "RssAnon:\t%8lu kB\n"
60 "RssFile:\t%8lu kB\n"
61 "RssShmem:\t%8lu kB\n"
62 "VmData:\t%8lu kB\n"
63 "VmStk:\t%8lu kB\n"
64 "VmExe:\t%8lu kB\n"
65 "VmLib:\t%8lu kB\n"
66 "VmPTE:\t%8lu kB\n"
67 "VmPMD:\t%8lu kB\n"
68 "VmSwap:\t%8lu kB\n",
69 hiwater_vm << (PAGE_SHIFT-10),
70 total_vm << (PAGE_SHIFT-10),
71 mm->locked_vm << (PAGE_SHIFT-10),
72 mm->pinned_vm << (PAGE_SHIFT-10),
73 hiwater_rss << (PAGE_SHIFT-10),
74 total_rss << (PAGE_SHIFT-10),
75 anon << (PAGE_SHIFT-10),
76 file << (PAGE_SHIFT-10),
77 shmem << (PAGE_SHIFT-10),
78 mm->data_vm << (PAGE_SHIFT-10),
79 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
80 ptes >> 10,
81 pmds >> 10,
82 swap << (PAGE_SHIFT-10));
83 hugetlb_report_usage(m, mm);
84 }
85
86 unsigned long task_vsize(struct mm_struct *mm)
87 {
88 return PAGE_SIZE * mm->total_vm;
89 }
90
91 unsigned long task_statm(struct mm_struct *mm,
92 unsigned long *shared, unsigned long *text,
93 unsigned long *data, unsigned long *resident)
94 {
95 *shared = get_mm_counter(mm, MM_FILEPAGES) +
96 get_mm_counter(mm, MM_SHMEMPAGES);
97 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
98 >> PAGE_SHIFT;
99 *data = mm->data_vm + mm->stack_vm;
100 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
101 return mm->total_vm;
102 }
103
104 #ifdef CONFIG_NUMA
105 /*
106 * Save get_task_policy() for show_numa_map().
107 */
108 static void hold_task_mempolicy(struct proc_maps_private *priv)
109 {
110 struct task_struct *task = priv->task;
111
112 task_lock(task);
113 priv->task_mempolicy = get_task_policy(task);
114 mpol_get(priv->task_mempolicy);
115 task_unlock(task);
116 }
117 static void release_task_mempolicy(struct proc_maps_private *priv)
118 {
119 mpol_put(priv->task_mempolicy);
120 }
121 #else
122 static void hold_task_mempolicy(struct proc_maps_private *priv)
123 {
124 }
125 static void release_task_mempolicy(struct proc_maps_private *priv)
126 {
127 }
128 #endif
129
130 static void vma_stop(struct proc_maps_private *priv)
131 {
132 struct mm_struct *mm = priv->mm;
133
134 release_task_mempolicy(priv);
135 up_read(&mm->mmap_sem);
136 mmput(mm);
137 }
138
139 static struct vm_area_struct *
140 m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
141 {
142 if (vma == priv->tail_vma)
143 return NULL;
144 return vma->vm_next ?: priv->tail_vma;
145 }
146
147 static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma)
148 {
149 if (m->count < m->size) /* vma is copied successfully */
150 m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL;
151 }
152
153 static void *m_start(struct seq_file *m, loff_t *ppos)
154 {
155 struct proc_maps_private *priv = m->private;
156 unsigned long last_addr = m->version;
157 struct mm_struct *mm;
158 struct vm_area_struct *vma;
159 unsigned int pos = *ppos;
160
161 /* See m_cache_vma(). Zero at the start or after lseek. */
162 if (last_addr == -1UL)
163 return NULL;
164
165 priv->task = get_proc_task(priv->inode);
166 if (!priv->task)
167 return ERR_PTR(-ESRCH);
168
169 mm = priv->mm;
170 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
171 return NULL;
172
173 down_read(&mm->mmap_sem);
174 hold_task_mempolicy(priv);
175 priv->tail_vma = get_gate_vma(mm);
176
177 if (last_addr) {
178 vma = find_vma(mm, last_addr);
179 if (vma && (vma = m_next_vma(priv, vma)))
180 return vma;
181 }
182
183 m->version = 0;
184 if (pos < mm->map_count) {
185 for (vma = mm->mmap; pos; pos--) {
186 m->version = vma->vm_start;
187 vma = vma->vm_next;
188 }
189 return vma;
190 }
191
192 /* we do not bother to update m->version in this case */
193 if (pos == mm->map_count && priv->tail_vma)
194 return priv->tail_vma;
195
196 vma_stop(priv);
197 return NULL;
198 }
199
200 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
201 {
202 struct proc_maps_private *priv = m->private;
203 struct vm_area_struct *next;
204
205 (*pos)++;
206 next = m_next_vma(priv, v);
207 if (!next)
208 vma_stop(priv);
209 return next;
210 }
211
212 static void m_stop(struct seq_file *m, void *v)
213 {
214 struct proc_maps_private *priv = m->private;
215
216 if (!IS_ERR_OR_NULL(v))
217 vma_stop(priv);
218 if (priv->task) {
219 put_task_struct(priv->task);
220 priv->task = NULL;
221 }
222 }
223
224 static int proc_maps_open(struct inode *inode, struct file *file,
225 const struct seq_operations *ops, int psize)
226 {
227 struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
228
229 if (!priv)
230 return -ENOMEM;
231
232 priv->inode = inode;
233 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
234 if (IS_ERR(priv->mm)) {
235 int err = PTR_ERR(priv->mm);
236
237 seq_release_private(inode, file);
238 return err;
239 }
240
241 return 0;
242 }
243
244 static int proc_map_release(struct inode *inode, struct file *file)
245 {
246 struct seq_file *seq = file->private_data;
247 struct proc_maps_private *priv = seq->private;
248
249 if (priv->mm)
250 mmdrop(priv->mm);
251
252 return seq_release_private(inode, file);
253 }
254
255 static int do_maps_open(struct inode *inode, struct file *file,
256 const struct seq_operations *ops)
257 {
258 return proc_maps_open(inode, file, ops,
259 sizeof(struct proc_maps_private));
260 }
261
262 /*
263 * Indicate if the VMA is a stack for the given task; for
264 * /proc/PID/maps that is the stack of the main task.
265 */
266 static int is_stack(struct proc_maps_private *priv,
267 struct vm_area_struct *vma, int is_pid)
268 {
269 int stack = 0;
270
271 if (is_pid) {
272 stack = vma->vm_start <= vma->vm_mm->start_stack &&
273 vma->vm_end >= vma->vm_mm->start_stack;
274 } else {
275 struct inode *inode = priv->inode;
276 struct task_struct *task;
277
278 rcu_read_lock();
279 task = pid_task(proc_pid(inode), PIDTYPE_PID);
280 if (task)
281 stack = vma_is_stack_for_task(vma, task);
282 rcu_read_unlock();
283 }
284 return stack;
285 }
286
287 static void
288 show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
289 {
290 struct mm_struct *mm = vma->vm_mm;
291 struct file *file = vma->vm_file;
292 struct proc_maps_private *priv = m->private;
293 vm_flags_t flags = vma->vm_flags;
294 unsigned long ino = 0;
295 unsigned long long pgoff = 0;
296 unsigned long start, end;
297 dev_t dev = 0;
298 const char *name = NULL;
299
300 if (file) {
301 struct inode *inode = file_inode(vma->vm_file);
302 dev = inode->i_sb->s_dev;
303 ino = inode->i_ino;
304 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
305 }
306
307 /* We don't show the stack guard page in /proc/maps */
308 start = vma->vm_start;
309 if (stack_guard_page_start(vma, start))
310 start += PAGE_SIZE;
311 end = vma->vm_end;
312 if (stack_guard_page_end(vma, end))
313 end -= PAGE_SIZE;
314
315 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
316 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
317 start,
318 end,
319 flags & VM_READ ? 'r' : '-',
320 flags & VM_WRITE ? 'w' : '-',
321 flags & VM_EXEC ? 'x' : '-',
322 flags & VM_MAYSHARE ? 's' : 'p',
323 pgoff,
324 MAJOR(dev), MINOR(dev), ino);
325
326 /*
327 * Print the dentry name for named mappings, and a
328 * special [heap] marker for the heap:
329 */
330 if (file) {
331 seq_pad(m, ' ');
332 seq_file_path(m, file, "\n");
333 goto done;
334 }
335
336 if (vma->vm_ops && vma->vm_ops->name) {
337 name = vma->vm_ops->name(vma);
338 if (name)
339 goto done;
340 }
341
342 name = arch_vma_name(vma);
343 if (!name) {
344 if (!mm) {
345 name = "[vdso]";
346 goto done;
347 }
348
349 if (vma->vm_start <= mm->brk &&
350 vma->vm_end >= mm->start_brk) {
351 name = "[heap]";
352 goto done;
353 }
354
355 if (is_stack(priv, vma, is_pid))
356 name = "[stack]";
357 }
358
359 done:
360 if (name) {
361 seq_pad(m, ' ');
362 seq_puts(m, name);
363 }
364 seq_putc(m, '\n');
365 }
366
367 static int show_map(struct seq_file *m, void *v, int is_pid)
368 {
369 show_map_vma(m, v, is_pid);
370 m_cache_vma(m, v);
371 return 0;
372 }
373
374 static int show_pid_map(struct seq_file *m, void *v)
375 {
376 return show_map(m, v, 1);
377 }
378
379 static int show_tid_map(struct seq_file *m, void *v)
380 {
381 return show_map(m, v, 0);
382 }
383
384 static const struct seq_operations proc_pid_maps_op = {
385 .start = m_start,
386 .next = m_next,
387 .stop = m_stop,
388 .show = show_pid_map
389 };
390
391 static const struct seq_operations proc_tid_maps_op = {
392 .start = m_start,
393 .next = m_next,
394 .stop = m_stop,
395 .show = show_tid_map
396 };
397
398 static int pid_maps_open(struct inode *inode, struct file *file)
399 {
400 return do_maps_open(inode, file, &proc_pid_maps_op);
401 }
402
403 static int tid_maps_open(struct inode *inode, struct file *file)
404 {
405 return do_maps_open(inode, file, &proc_tid_maps_op);
406 }
407
408 const struct file_operations proc_pid_maps_operations = {
409 .open = pid_maps_open,
410 .read = seq_read,
411 .llseek = seq_lseek,
412 .release = proc_map_release,
413 };
414
415 const struct file_operations proc_tid_maps_operations = {
416 .open = tid_maps_open,
417 .read = seq_read,
418 .llseek = seq_lseek,
419 .release = proc_map_release,
420 };
421
422 /*
423 * Proportional Set Size(PSS): my share of RSS.
424 *
425 * PSS of a process is the count of pages it has in memory, where each
426 * page is divided by the number of processes sharing it. So if a
427 * process has 1000 pages all to itself, and 1000 shared with one other
428 * process, its PSS will be 1500.
429 *
430 * To keep (accumulated) division errors low, we adopt a 64bit
431 * fixed-point pss counter to minimize division errors. So (pss >>
432 * PSS_SHIFT) would be the real byte count.
433 *
434 * A shift of 12 before division means (assuming 4K page size):
435 * - 1M 3-user-pages add up to 8KB errors;
436 * - supports mapcount up to 2^24, or 16M;
437 * - supports PSS up to 2^52 bytes, or 4PB.
438 */
439 #define PSS_SHIFT 12
440
441 #ifdef CONFIG_PROC_PAGE_MONITOR
442 struct mem_size_stats {
443 unsigned long resident;
444 unsigned long shared_clean;
445 unsigned long shared_dirty;
446 unsigned long private_clean;
447 unsigned long private_dirty;
448 unsigned long referenced;
449 unsigned long anonymous;
450 unsigned long anonymous_thp;
451 unsigned long swap;
452 unsigned long shared_hugetlb;
453 unsigned long private_hugetlb;
454 u64 pss;
455 u64 swap_pss;
456 bool check_shmem_swap;
457 };
458
459 static void smaps_account(struct mem_size_stats *mss, struct page *page,
460 bool compound, bool young, bool dirty)
461 {
462 int i, nr = compound ? 1 << compound_order(page) : 1;
463 unsigned long size = nr * PAGE_SIZE;
464
465 if (PageAnon(page))
466 mss->anonymous += size;
467
468 mss->resident += size;
469 /* Accumulate the size in pages that have been accessed. */
470 if (young || page_is_young(page) || PageReferenced(page))
471 mss->referenced += size;
472
473 /*
474 * page_count(page) == 1 guarantees the page is mapped exactly once.
475 * If any subpage of the compound page mapped with PTE it would elevate
476 * page_count().
477 */
478 if (page_count(page) == 1) {
479 if (dirty || PageDirty(page))
480 mss->private_dirty += size;
481 else
482 mss->private_clean += size;
483 mss->pss += (u64)size << PSS_SHIFT;
484 return;
485 }
486
487 for (i = 0; i < nr; i++, page++) {
488 int mapcount = page_mapcount(page);
489
490 if (mapcount >= 2) {
491 if (dirty || PageDirty(page))
492 mss->shared_dirty += PAGE_SIZE;
493 else
494 mss->shared_clean += PAGE_SIZE;
495 mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
496 } else {
497 if (dirty || PageDirty(page))
498 mss->private_dirty += PAGE_SIZE;
499 else
500 mss->private_clean += PAGE_SIZE;
501 mss->pss += PAGE_SIZE << PSS_SHIFT;
502 }
503 }
504 }
505
506 #ifdef CONFIG_SHMEM
507 static int smaps_pte_hole(unsigned long addr, unsigned long end,
508 struct mm_walk *walk)
509 {
510 struct mem_size_stats *mss = walk->private;
511
512 mss->swap += shmem_partial_swap_usage(
513 walk->vma->vm_file->f_mapping, addr, end);
514
515 return 0;
516 }
517 #endif
518
519 static void smaps_pte_entry(pte_t *pte, unsigned long addr,
520 struct mm_walk *walk)
521 {
522 struct mem_size_stats *mss = walk->private;
523 struct vm_area_struct *vma = walk->vma;
524 struct page *page = NULL;
525
526 if (pte_present(*pte)) {
527 page = vm_normal_page(vma, addr, *pte);
528 } else if (is_swap_pte(*pte)) {
529 swp_entry_t swpent = pte_to_swp_entry(*pte);
530
531 if (!non_swap_entry(swpent)) {
532 int mapcount;
533
534 mss->swap += PAGE_SIZE;
535 mapcount = swp_swapcount(swpent);
536 if (mapcount >= 2) {
537 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
538
539 do_div(pss_delta, mapcount);
540 mss->swap_pss += pss_delta;
541 } else {
542 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
543 }
544 } else if (is_migration_entry(swpent))
545 page = migration_entry_to_page(swpent);
546 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
547 && pte_none(*pte))) {
548 page = find_get_entry(vma->vm_file->f_mapping,
549 linear_page_index(vma, addr));
550 if (!page)
551 return;
552
553 if (radix_tree_exceptional_entry(page))
554 mss->swap += PAGE_SIZE;
555 else
556 put_page(page);
557
558 return;
559 }
560
561 if (!page)
562 return;
563
564 smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
565 }
566
567 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
568 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
569 struct mm_walk *walk)
570 {
571 struct mem_size_stats *mss = walk->private;
572 struct vm_area_struct *vma = walk->vma;
573 struct page *page;
574
575 /* FOLL_DUMP will return -EFAULT on huge zero page */
576 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
577 if (IS_ERR_OR_NULL(page))
578 return;
579 mss->anonymous_thp += HPAGE_PMD_SIZE;
580 smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
581 }
582 #else
583 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
584 struct mm_walk *walk)
585 {
586 }
587 #endif
588
589 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
590 struct mm_walk *walk)
591 {
592 struct vm_area_struct *vma = walk->vma;
593 pte_t *pte;
594 spinlock_t *ptl;
595
596 ptl = pmd_trans_huge_lock(pmd, vma);
597 if (ptl) {
598 smaps_pmd_entry(pmd, addr, walk);
599 spin_unlock(ptl);
600 return 0;
601 }
602
603 if (pmd_trans_unstable(pmd))
604 return 0;
605 /*
606 * The mmap_sem held all the way back in m_start() is what
607 * keeps khugepaged out of here and from collapsing things
608 * in here.
609 */
610 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
611 for (; addr != end; pte++, addr += PAGE_SIZE)
612 smaps_pte_entry(pte, addr, walk);
613 pte_unmap_unlock(pte - 1, ptl);
614 cond_resched();
615 return 0;
616 }
617
618 static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
619 {
620 /*
621 * Don't forget to update Documentation/ on changes.
622 */
623 static const char mnemonics[BITS_PER_LONG][2] = {
624 /*
625 * In case if we meet a flag we don't know about.
626 */
627 [0 ... (BITS_PER_LONG-1)] = "??",
628
629 [ilog2(VM_READ)] = "rd",
630 [ilog2(VM_WRITE)] = "wr",
631 [ilog2(VM_EXEC)] = "ex",
632 [ilog2(VM_SHARED)] = "sh",
633 [ilog2(VM_MAYREAD)] = "mr",
634 [ilog2(VM_MAYWRITE)] = "mw",
635 [ilog2(VM_MAYEXEC)] = "me",
636 [ilog2(VM_MAYSHARE)] = "ms",
637 [ilog2(VM_GROWSDOWN)] = "gd",
638 [ilog2(VM_PFNMAP)] = "pf",
639 [ilog2(VM_DENYWRITE)] = "dw",
640 #ifdef CONFIG_X86_INTEL_MPX
641 [ilog2(VM_MPX)] = "mp",
642 #endif
643 [ilog2(VM_LOCKED)] = "lo",
644 [ilog2(VM_IO)] = "io",
645 [ilog2(VM_SEQ_READ)] = "sr",
646 [ilog2(VM_RAND_READ)] = "rr",
647 [ilog2(VM_DONTCOPY)] = "dc",
648 [ilog2(VM_DONTEXPAND)] = "de",
649 [ilog2(VM_ACCOUNT)] = "ac",
650 [ilog2(VM_NORESERVE)] = "nr",
651 [ilog2(VM_HUGETLB)] = "ht",
652 [ilog2(VM_ARCH_1)] = "ar",
653 [ilog2(VM_DONTDUMP)] = "dd",
654 #ifdef CONFIG_MEM_SOFT_DIRTY
655 [ilog2(VM_SOFTDIRTY)] = "sd",
656 #endif
657 [ilog2(VM_MIXEDMAP)] = "mm",
658 [ilog2(VM_HUGEPAGE)] = "hg",
659 [ilog2(VM_NOHUGEPAGE)] = "nh",
660 [ilog2(VM_MERGEABLE)] = "mg",
661 [ilog2(VM_UFFD_MISSING)]= "um",
662 [ilog2(VM_UFFD_WP)] = "uw",
663 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
664 /* These come out via ProtectionKey: */
665 [ilog2(VM_PKEY_BIT0)] = "",
666 [ilog2(VM_PKEY_BIT1)] = "",
667 [ilog2(VM_PKEY_BIT2)] = "",
668 [ilog2(VM_PKEY_BIT3)] = "",
669 #endif
670 };
671 size_t i;
672
673 seq_puts(m, "VmFlags: ");
674 for (i = 0; i < BITS_PER_LONG; i++) {
675 if (!mnemonics[i][0])
676 continue;
677 if (vma->vm_flags & (1UL << i)) {
678 seq_printf(m, "%c%c ",
679 mnemonics[i][0], mnemonics[i][1]);
680 }
681 }
682 seq_putc(m, '\n');
683 }
684
685 #ifdef CONFIG_HUGETLB_PAGE
686 static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
687 unsigned long addr, unsigned long end,
688 struct mm_walk *walk)
689 {
690 struct mem_size_stats *mss = walk->private;
691 struct vm_area_struct *vma = walk->vma;
692 struct page *page = NULL;
693
694 if (pte_present(*pte)) {
695 page = vm_normal_page(vma, addr, *pte);
696 } else if (is_swap_pte(*pte)) {
697 swp_entry_t swpent = pte_to_swp_entry(*pte);
698
699 if (is_migration_entry(swpent))
700 page = migration_entry_to_page(swpent);
701 }
702 if (page) {
703 int mapcount = page_mapcount(page);
704
705 if (mapcount >= 2)
706 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
707 else
708 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
709 }
710 return 0;
711 }
712 #endif /* HUGETLB_PAGE */
713
714 void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
715 {
716 }
717
718 static int show_smap(struct seq_file *m, void *v, int is_pid)
719 {
720 struct vm_area_struct *vma = v;
721 struct mem_size_stats mss;
722 struct mm_walk smaps_walk = {
723 .pmd_entry = smaps_pte_range,
724 #ifdef CONFIG_HUGETLB_PAGE
725 .hugetlb_entry = smaps_hugetlb_range,
726 #endif
727 .mm = vma->vm_mm,
728 .private = &mss,
729 };
730
731 memset(&mss, 0, sizeof mss);
732
733 #ifdef CONFIG_SHMEM
734 if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
735 /*
736 * For shared or readonly shmem mappings we know that all
737 * swapped out pages belong to the shmem object, and we can
738 * obtain the swap value much more efficiently. For private
739 * writable mappings, we might have COW pages that are
740 * not affected by the parent swapped out pages of the shmem
741 * object, so we have to distinguish them during the page walk.
742 * Unless we know that the shmem object (or the part mapped by
743 * our VMA) has no swapped out pages at all.
744 */
745 unsigned long shmem_swapped = shmem_swap_usage(vma);
746
747 if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
748 !(vma->vm_flags & VM_WRITE)) {
749 mss.swap = shmem_swapped;
750 } else {
751 mss.check_shmem_swap = true;
752 smaps_walk.pte_hole = smaps_pte_hole;
753 }
754 }
755 #endif
756
757 /* mmap_sem is held in m_start */
758 walk_page_vma(vma, &smaps_walk);
759
760 show_map_vma(m, vma, is_pid);
761
762 seq_printf(m,
763 "Size: %8lu kB\n"
764 "Rss: %8lu kB\n"
765 "Pss: %8lu kB\n"
766 "Shared_Clean: %8lu kB\n"
767 "Shared_Dirty: %8lu kB\n"
768 "Private_Clean: %8lu kB\n"
769 "Private_Dirty: %8lu kB\n"
770 "Referenced: %8lu kB\n"
771 "Anonymous: %8lu kB\n"
772 "AnonHugePages: %8lu kB\n"
773 "Shared_Hugetlb: %8lu kB\n"
774 "Private_Hugetlb: %7lu kB\n"
775 "Swap: %8lu kB\n"
776 "SwapPss: %8lu kB\n"
777 "KernelPageSize: %8lu kB\n"
778 "MMUPageSize: %8lu kB\n"
779 "Locked: %8lu kB\n",
780 (vma->vm_end - vma->vm_start) >> 10,
781 mss.resident >> 10,
782 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
783 mss.shared_clean >> 10,
784 mss.shared_dirty >> 10,
785 mss.private_clean >> 10,
786 mss.private_dirty >> 10,
787 mss.referenced >> 10,
788 mss.anonymous >> 10,
789 mss.anonymous_thp >> 10,
790 mss.shared_hugetlb >> 10,
791 mss.private_hugetlb >> 10,
792 mss.swap >> 10,
793 (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
794 vma_kernel_pagesize(vma) >> 10,
795 vma_mmu_pagesize(vma) >> 10,
796 (vma->vm_flags & VM_LOCKED) ?
797 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
798
799 arch_show_smap(m, vma);
800 show_smap_vma_flags(m, vma);
801 m_cache_vma(m, vma);
802 return 0;
803 }
804
805 static int show_pid_smap(struct seq_file *m, void *v)
806 {
807 return show_smap(m, v, 1);
808 }
809
810 static int show_tid_smap(struct seq_file *m, void *v)
811 {
812 return show_smap(m, v, 0);
813 }
814
815 static const struct seq_operations proc_pid_smaps_op = {
816 .start = m_start,
817 .next = m_next,
818 .stop = m_stop,
819 .show = show_pid_smap
820 };
821
822 static const struct seq_operations proc_tid_smaps_op = {
823 .start = m_start,
824 .next = m_next,
825 .stop = m_stop,
826 .show = show_tid_smap
827 };
828
829 static int pid_smaps_open(struct inode *inode, struct file *file)
830 {
831 return do_maps_open(inode, file, &proc_pid_smaps_op);
832 }
833
834 static int tid_smaps_open(struct inode *inode, struct file *file)
835 {
836 return do_maps_open(inode, file, &proc_tid_smaps_op);
837 }
838
839 const struct file_operations proc_pid_smaps_operations = {
840 .open = pid_smaps_open,
841 .read = seq_read,
842 .llseek = seq_lseek,
843 .release = proc_map_release,
844 };
845
846 const struct file_operations proc_tid_smaps_operations = {
847 .open = tid_smaps_open,
848 .read = seq_read,
849 .llseek = seq_lseek,
850 .release = proc_map_release,
851 };
852
853 enum clear_refs_types {
854 CLEAR_REFS_ALL = 1,
855 CLEAR_REFS_ANON,
856 CLEAR_REFS_MAPPED,
857 CLEAR_REFS_SOFT_DIRTY,
858 CLEAR_REFS_MM_HIWATER_RSS,
859 CLEAR_REFS_LAST,
860 };
861
862 struct clear_refs_private {
863 enum clear_refs_types type;
864 };
865
866 #ifdef CONFIG_MEM_SOFT_DIRTY
867 static inline void clear_soft_dirty(struct vm_area_struct *vma,
868 unsigned long addr, pte_t *pte)
869 {
870 /*
871 * The soft-dirty tracker uses #PF-s to catch writes
872 * to pages, so write-protect the pte as well. See the
873 * Documentation/vm/soft-dirty.txt for full description
874 * of how soft-dirty works.
875 */
876 pte_t ptent = *pte;
877
878 if (pte_present(ptent)) {
879 ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
880 ptent = pte_wrprotect(ptent);
881 ptent = pte_clear_soft_dirty(ptent);
882 ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
883 } else if (is_swap_pte(ptent)) {
884 ptent = pte_swp_clear_soft_dirty(ptent);
885 set_pte_at(vma->vm_mm, addr, pte, ptent);
886 }
887 }
888 #else
889 static inline void clear_soft_dirty(struct vm_area_struct *vma,
890 unsigned long addr, pte_t *pte)
891 {
892 }
893 #endif
894
895 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
896 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
897 unsigned long addr, pmd_t *pmdp)
898 {
899 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
900
901 pmd = pmd_wrprotect(pmd);
902 pmd = pmd_clear_soft_dirty(pmd);
903
904 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
905 }
906 #else
907 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
908 unsigned long addr, pmd_t *pmdp)
909 {
910 }
911 #endif
912
913 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
914 unsigned long end, struct mm_walk *walk)
915 {
916 struct clear_refs_private *cp = walk->private;
917 struct vm_area_struct *vma = walk->vma;
918 pte_t *pte, ptent;
919 spinlock_t *ptl;
920 struct page *page;
921
922 ptl = pmd_trans_huge_lock(pmd, vma);
923 if (ptl) {
924 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
925 clear_soft_dirty_pmd(vma, addr, pmd);
926 goto out;
927 }
928
929 page = pmd_page(*pmd);
930
931 /* Clear accessed and referenced bits. */
932 pmdp_test_and_clear_young(vma, addr, pmd);
933 test_and_clear_page_young(page);
934 ClearPageReferenced(page);
935 out:
936 spin_unlock(ptl);
937 return 0;
938 }
939
940 if (pmd_trans_unstable(pmd))
941 return 0;
942
943 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
944 for (; addr != end; pte++, addr += PAGE_SIZE) {
945 ptent = *pte;
946
947 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
948 clear_soft_dirty(vma, addr, pte);
949 continue;
950 }
951
952 if (!pte_present(ptent))
953 continue;
954
955 page = vm_normal_page(vma, addr, ptent);
956 if (!page)
957 continue;
958
959 /* Clear accessed and referenced bits. */
960 ptep_test_and_clear_young(vma, addr, pte);
961 test_and_clear_page_young(page);
962 ClearPageReferenced(page);
963 }
964 pte_unmap_unlock(pte - 1, ptl);
965 cond_resched();
966 return 0;
967 }
968
969 static int clear_refs_test_walk(unsigned long start, unsigned long end,
970 struct mm_walk *walk)
971 {
972 struct clear_refs_private *cp = walk->private;
973 struct vm_area_struct *vma = walk->vma;
974
975 if (vma->vm_flags & VM_PFNMAP)
976 return 1;
977
978 /*
979 * Writing 1 to /proc/pid/clear_refs affects all pages.
980 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
981 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
982 * Writing 4 to /proc/pid/clear_refs affects all pages.
983 */
984 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
985 return 1;
986 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
987 return 1;
988 return 0;
989 }
990
991 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
992 size_t count, loff_t *ppos)
993 {
994 struct task_struct *task;
995 char buffer[PROC_NUMBUF];
996 struct mm_struct *mm;
997 struct vm_area_struct *vma;
998 enum clear_refs_types type;
999 int itype;
1000 int rv;
1001
1002 memset(buffer, 0, sizeof(buffer));
1003 if (count > sizeof(buffer) - 1)
1004 count = sizeof(buffer) - 1;
1005 if (copy_from_user(buffer, buf, count))
1006 return -EFAULT;
1007 rv = kstrtoint(strstrip(buffer), 10, &itype);
1008 if (rv < 0)
1009 return rv;
1010 type = (enum clear_refs_types)itype;
1011 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
1012 return -EINVAL;
1013
1014 task = get_proc_task(file_inode(file));
1015 if (!task)
1016 return -ESRCH;
1017 mm = get_task_mm(task);
1018 if (mm) {
1019 struct clear_refs_private cp = {
1020 .type = type,
1021 };
1022 struct mm_walk clear_refs_walk = {
1023 .pmd_entry = clear_refs_pte_range,
1024 .test_walk = clear_refs_test_walk,
1025 .mm = mm,
1026 .private = &cp,
1027 };
1028
1029 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1030 if (down_write_killable(&mm->mmap_sem)) {
1031 count = -EINTR;
1032 goto out_mm;
1033 }
1034
1035 /*
1036 * Writing 5 to /proc/pid/clear_refs resets the peak
1037 * resident set size to this mm's current rss value.
1038 */
1039 reset_mm_hiwater_rss(mm);
1040 up_write(&mm->mmap_sem);
1041 goto out_mm;
1042 }
1043
1044 down_read(&mm->mmap_sem);
1045 if (type == CLEAR_REFS_SOFT_DIRTY) {
1046 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1047 if (!(vma->vm_flags & VM_SOFTDIRTY))
1048 continue;
1049 up_read(&mm->mmap_sem);
1050 if (down_write_killable(&mm->mmap_sem)) {
1051 count = -EINTR;
1052 goto out_mm;
1053 }
1054 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1055 vma->vm_flags &= ~VM_SOFTDIRTY;
1056 vma_set_page_prot(vma);
1057 }
1058 downgrade_write(&mm->mmap_sem);
1059 break;
1060 }
1061 mmu_notifier_invalidate_range_start(mm, 0, -1);
1062 }
1063 walk_page_range(0, ~0UL, &clear_refs_walk);
1064 if (type == CLEAR_REFS_SOFT_DIRTY)
1065 mmu_notifier_invalidate_range_end(mm, 0, -1);
1066 flush_tlb_mm(mm);
1067 up_read(&mm->mmap_sem);
1068 out_mm:
1069 mmput(mm);
1070 }
1071 put_task_struct(task);
1072
1073 return count;
1074 }
1075
1076 const struct file_operations proc_clear_refs_operations = {
1077 .write = clear_refs_write,
1078 .llseek = noop_llseek,
1079 };
1080
1081 typedef struct {
1082 u64 pme;
1083 } pagemap_entry_t;
1084
1085 struct pagemapread {
1086 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1087 pagemap_entry_t *buffer;
1088 bool show_pfn;
1089 };
1090
1091 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1092 #define PAGEMAP_WALK_MASK (PMD_MASK)
1093
1094 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1095 #define PM_PFRAME_BITS 55
1096 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1097 #define PM_SOFT_DIRTY BIT_ULL(55)
1098 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1099 #define PM_FILE BIT_ULL(61)
1100 #define PM_SWAP BIT_ULL(62)
1101 #define PM_PRESENT BIT_ULL(63)
1102
1103 #define PM_END_OF_BUFFER 1
1104
1105 static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1106 {
1107 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1108 }
1109
1110 static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1111 struct pagemapread *pm)
1112 {
1113 pm->buffer[pm->pos++] = *pme;
1114 if (pm->pos >= pm->len)
1115 return PM_END_OF_BUFFER;
1116 return 0;
1117 }
1118
1119 static int pagemap_pte_hole(unsigned long start, unsigned long end,
1120 struct mm_walk *walk)
1121 {
1122 struct pagemapread *pm = walk->private;
1123 unsigned long addr = start;
1124 int err = 0;
1125
1126 while (addr < end) {
1127 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1128 pagemap_entry_t pme = make_pme(0, 0);
1129 /* End of address space hole, which we mark as non-present. */
1130 unsigned long hole_end;
1131
1132 if (vma)
1133 hole_end = min(end, vma->vm_start);
1134 else
1135 hole_end = end;
1136
1137 for (; addr < hole_end; addr += PAGE_SIZE) {
1138 err = add_to_pagemap(addr, &pme, pm);
1139 if (err)
1140 goto out;
1141 }
1142
1143 if (!vma)
1144 break;
1145
1146 /* Addresses in the VMA. */
1147 if (vma->vm_flags & VM_SOFTDIRTY)
1148 pme = make_pme(0, PM_SOFT_DIRTY);
1149 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1150 err = add_to_pagemap(addr, &pme, pm);
1151 if (err)
1152 goto out;
1153 }
1154 }
1155 out:
1156 return err;
1157 }
1158
1159 static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1160 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1161 {
1162 u64 frame = 0, flags = 0;
1163 struct page *page = NULL;
1164
1165 if (pte_present(pte)) {
1166 if (pm->show_pfn)
1167 frame = pte_pfn(pte);
1168 flags |= PM_PRESENT;
1169 page = vm_normal_page(vma, addr, pte);
1170 if (pte_soft_dirty(pte))
1171 flags |= PM_SOFT_DIRTY;
1172 } else if (is_swap_pte(pte)) {
1173 swp_entry_t entry;
1174 if (pte_swp_soft_dirty(pte))
1175 flags |= PM_SOFT_DIRTY;
1176 entry = pte_to_swp_entry(pte);
1177 frame = swp_type(entry) |
1178 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1179 flags |= PM_SWAP;
1180 if (is_migration_entry(entry))
1181 page = migration_entry_to_page(entry);
1182 }
1183
1184 if (page && !PageAnon(page))
1185 flags |= PM_FILE;
1186 if (page && page_mapcount(page) == 1)
1187 flags |= PM_MMAP_EXCLUSIVE;
1188 if (vma->vm_flags & VM_SOFTDIRTY)
1189 flags |= PM_SOFT_DIRTY;
1190
1191 return make_pme(frame, flags);
1192 }
1193
1194 static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1195 struct mm_walk *walk)
1196 {
1197 struct vm_area_struct *vma = walk->vma;
1198 struct pagemapread *pm = walk->private;
1199 spinlock_t *ptl;
1200 pte_t *pte, *orig_pte;
1201 int err = 0;
1202
1203 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1204 ptl = pmd_trans_huge_lock(pmdp, vma);
1205 if (ptl) {
1206 u64 flags = 0, frame = 0;
1207 pmd_t pmd = *pmdp;
1208
1209 if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
1210 flags |= PM_SOFT_DIRTY;
1211
1212 /*
1213 * Currently pmd for thp is always present because thp
1214 * can not be swapped-out, migrated, or HWPOISONed
1215 * (split in such cases instead.)
1216 * This if-check is just to prepare for future implementation.
1217 */
1218 if (pmd_present(pmd)) {
1219 struct page *page = pmd_page(pmd);
1220
1221 if (page_mapcount(page) == 1)
1222 flags |= PM_MMAP_EXCLUSIVE;
1223
1224 flags |= PM_PRESENT;
1225 if (pm->show_pfn)
1226 frame = pmd_pfn(pmd) +
1227 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1228 }
1229
1230 for (; addr != end; addr += PAGE_SIZE) {
1231 pagemap_entry_t pme = make_pme(frame, flags);
1232
1233 err = add_to_pagemap(addr, &pme, pm);
1234 if (err)
1235 break;
1236 if (pm->show_pfn && (flags & PM_PRESENT))
1237 frame++;
1238 }
1239 spin_unlock(ptl);
1240 return err;
1241 }
1242
1243 if (pmd_trans_unstable(pmdp))
1244 return 0;
1245 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1246
1247 /*
1248 * We can assume that @vma always points to a valid one and @end never
1249 * goes beyond vma->vm_end.
1250 */
1251 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1252 for (; addr < end; pte++, addr += PAGE_SIZE) {
1253 pagemap_entry_t pme;
1254
1255 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1256 err = add_to_pagemap(addr, &pme, pm);
1257 if (err)
1258 break;
1259 }
1260 pte_unmap_unlock(orig_pte, ptl);
1261
1262 cond_resched();
1263
1264 return err;
1265 }
1266
1267 #ifdef CONFIG_HUGETLB_PAGE
1268 /* This function walks within one hugetlb entry in the single call */
1269 static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1270 unsigned long addr, unsigned long end,
1271 struct mm_walk *walk)
1272 {
1273 struct pagemapread *pm = walk->private;
1274 struct vm_area_struct *vma = walk->vma;
1275 u64 flags = 0, frame = 0;
1276 int err = 0;
1277 pte_t pte;
1278
1279 if (vma->vm_flags & VM_SOFTDIRTY)
1280 flags |= PM_SOFT_DIRTY;
1281
1282 pte = huge_ptep_get(ptep);
1283 if (pte_present(pte)) {
1284 struct page *page = pte_page(pte);
1285
1286 if (!PageAnon(page))
1287 flags |= PM_FILE;
1288
1289 if (page_mapcount(page) == 1)
1290 flags |= PM_MMAP_EXCLUSIVE;
1291
1292 flags |= PM_PRESENT;
1293 if (pm->show_pfn)
1294 frame = pte_pfn(pte) +
1295 ((addr & ~hmask) >> PAGE_SHIFT);
1296 }
1297
1298 for (; addr != end; addr += PAGE_SIZE) {
1299 pagemap_entry_t pme = make_pme(frame, flags);
1300
1301 err = add_to_pagemap(addr, &pme, pm);
1302 if (err)
1303 return err;
1304 if (pm->show_pfn && (flags & PM_PRESENT))
1305 frame++;
1306 }
1307
1308 cond_resched();
1309
1310 return err;
1311 }
1312 #endif /* HUGETLB_PAGE */
1313
1314 /*
1315 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1316 *
1317 * For each page in the address space, this file contains one 64-bit entry
1318 * consisting of the following:
1319 *
1320 * Bits 0-54 page frame number (PFN) if present
1321 * Bits 0-4 swap type if swapped
1322 * Bits 5-54 swap offset if swapped
1323 * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt)
1324 * Bit 56 page exclusively mapped
1325 * Bits 57-60 zero
1326 * Bit 61 page is file-page or shared-anon
1327 * Bit 62 page swapped
1328 * Bit 63 page present
1329 *
1330 * If the page is not present but in swap, then the PFN contains an
1331 * encoding of the swap file number and the page's offset into the
1332 * swap. Unmapped pages return a null PFN. This allows determining
1333 * precisely which pages are mapped (or in swap) and comparing mapped
1334 * pages between processes.
1335 *
1336 * Efficient users of this interface will use /proc/pid/maps to
1337 * determine which areas of memory are actually mapped and llseek to
1338 * skip over unmapped regions.
1339 */
1340 static ssize_t pagemap_read(struct file *file, char __user *buf,
1341 size_t count, loff_t *ppos)
1342 {
1343 struct mm_struct *mm = file->private_data;
1344 struct pagemapread pm;
1345 struct mm_walk pagemap_walk = {};
1346 unsigned long src;
1347 unsigned long svpfn;
1348 unsigned long start_vaddr;
1349 unsigned long end_vaddr;
1350 int ret = 0, copied = 0;
1351
1352 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
1353 goto out;
1354
1355 ret = -EINVAL;
1356 /* file position must be aligned */
1357 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1358 goto out_mm;
1359
1360 ret = 0;
1361 if (!count)
1362 goto out_mm;
1363
1364 /* do not disclose physical addresses: attack vector */
1365 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1366
1367 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1368 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
1369 ret = -ENOMEM;
1370 if (!pm.buffer)
1371 goto out_mm;
1372
1373 pagemap_walk.pmd_entry = pagemap_pmd_range;
1374 pagemap_walk.pte_hole = pagemap_pte_hole;
1375 #ifdef CONFIG_HUGETLB_PAGE
1376 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1377 #endif
1378 pagemap_walk.mm = mm;
1379 pagemap_walk.private = &pm;
1380
1381 src = *ppos;
1382 svpfn = src / PM_ENTRY_BYTES;
1383 start_vaddr = svpfn << PAGE_SHIFT;
1384 end_vaddr = mm->task_size;
1385
1386 /* watch out for wraparound */
1387 if (svpfn > mm->task_size >> PAGE_SHIFT)
1388 start_vaddr = end_vaddr;
1389
1390 /*
1391 * The odds are that this will stop walking way
1392 * before end_vaddr, because the length of the
1393 * user buffer is tracked in "pm", and the walk
1394 * will stop when we hit the end of the buffer.
1395 */
1396 ret = 0;
1397 while (count && (start_vaddr < end_vaddr)) {
1398 int len;
1399 unsigned long end;
1400
1401 pm.pos = 0;
1402 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1403 /* overflow ? */
1404 if (end < start_vaddr || end > end_vaddr)
1405 end = end_vaddr;
1406 down_read(&mm->mmap_sem);
1407 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1408 up_read(&mm->mmap_sem);
1409 start_vaddr = end;
1410
1411 len = min(count, PM_ENTRY_BYTES * pm.pos);
1412 if (copy_to_user(buf, pm.buffer, len)) {
1413 ret = -EFAULT;
1414 goto out_free;
1415 }
1416 copied += len;
1417 buf += len;
1418 count -= len;
1419 }
1420 *ppos += copied;
1421 if (!ret || ret == PM_END_OF_BUFFER)
1422 ret = copied;
1423
1424 out_free:
1425 kfree(pm.buffer);
1426 out_mm:
1427 mmput(mm);
1428 out:
1429 return ret;
1430 }
1431
1432 static int pagemap_open(struct inode *inode, struct file *file)
1433 {
1434 struct mm_struct *mm;
1435
1436 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1437 if (IS_ERR(mm))
1438 return PTR_ERR(mm);
1439 file->private_data = mm;
1440 return 0;
1441 }
1442
1443 static int pagemap_release(struct inode *inode, struct file *file)
1444 {
1445 struct mm_struct *mm = file->private_data;
1446
1447 if (mm)
1448 mmdrop(mm);
1449 return 0;
1450 }
1451
1452 const struct file_operations proc_pagemap_operations = {
1453 .llseek = mem_lseek, /* borrow this */
1454 .read = pagemap_read,
1455 .open = pagemap_open,
1456 .release = pagemap_release,
1457 };
1458 #endif /* CONFIG_PROC_PAGE_MONITOR */
1459
1460 #ifdef CONFIG_NUMA
1461
1462 struct numa_maps {
1463 unsigned long pages;
1464 unsigned long anon;
1465 unsigned long active;
1466 unsigned long writeback;
1467 unsigned long mapcount_max;
1468 unsigned long dirty;
1469 unsigned long swapcache;
1470 unsigned long node[MAX_NUMNODES];
1471 };
1472
1473 struct numa_maps_private {
1474 struct proc_maps_private proc_maps;
1475 struct numa_maps md;
1476 };
1477
1478 static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1479 unsigned long nr_pages)
1480 {
1481 int count = page_mapcount(page);
1482
1483 md->pages += nr_pages;
1484 if (pte_dirty || PageDirty(page))
1485 md->dirty += nr_pages;
1486
1487 if (PageSwapCache(page))
1488 md->swapcache += nr_pages;
1489
1490 if (PageActive(page) || PageUnevictable(page))
1491 md->active += nr_pages;
1492
1493 if (PageWriteback(page))
1494 md->writeback += nr_pages;
1495
1496 if (PageAnon(page))
1497 md->anon += nr_pages;
1498
1499 if (count > md->mapcount_max)
1500 md->mapcount_max = count;
1501
1502 md->node[page_to_nid(page)] += nr_pages;
1503 }
1504
1505 static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1506 unsigned long addr)
1507 {
1508 struct page *page;
1509 int nid;
1510
1511 if (!pte_present(pte))
1512 return NULL;
1513
1514 page = vm_normal_page(vma, addr, pte);
1515 if (!page)
1516 return NULL;
1517
1518 if (PageReserved(page))
1519 return NULL;
1520
1521 nid = page_to_nid(page);
1522 if (!node_isset(nid, node_states[N_MEMORY]))
1523 return NULL;
1524
1525 return page;
1526 }
1527
1528 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1529 static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1530 struct vm_area_struct *vma,
1531 unsigned long addr)
1532 {
1533 struct page *page;
1534 int nid;
1535
1536 if (!pmd_present(pmd))
1537 return NULL;
1538
1539 page = vm_normal_page_pmd(vma, addr, pmd);
1540 if (!page)
1541 return NULL;
1542
1543 if (PageReserved(page))
1544 return NULL;
1545
1546 nid = page_to_nid(page);
1547 if (!node_isset(nid, node_states[N_MEMORY]))
1548 return NULL;
1549
1550 return page;
1551 }
1552 #endif
1553
1554 static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1555 unsigned long end, struct mm_walk *walk)
1556 {
1557 struct numa_maps *md = walk->private;
1558 struct vm_area_struct *vma = walk->vma;
1559 spinlock_t *ptl;
1560 pte_t *orig_pte;
1561 pte_t *pte;
1562
1563 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1564 ptl = pmd_trans_huge_lock(pmd, vma);
1565 if (ptl) {
1566 struct page *page;
1567
1568 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1569 if (page)
1570 gather_stats(page, md, pmd_dirty(*pmd),
1571 HPAGE_PMD_SIZE/PAGE_SIZE);
1572 spin_unlock(ptl);
1573 return 0;
1574 }
1575
1576 if (pmd_trans_unstable(pmd))
1577 return 0;
1578 #endif
1579 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1580 do {
1581 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1582 if (!page)
1583 continue;
1584 gather_stats(page, md, pte_dirty(*pte), 1);
1585
1586 } while (pte++, addr += PAGE_SIZE, addr != end);
1587 pte_unmap_unlock(orig_pte, ptl);
1588 return 0;
1589 }
1590 #ifdef CONFIG_HUGETLB_PAGE
1591 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1592 unsigned long addr, unsigned long end, struct mm_walk *walk)
1593 {
1594 pte_t huge_pte = huge_ptep_get(pte);
1595 struct numa_maps *md;
1596 struct page *page;
1597
1598 if (!pte_present(huge_pte))
1599 return 0;
1600
1601 page = pte_page(huge_pte);
1602 if (!page)
1603 return 0;
1604
1605 md = walk->private;
1606 gather_stats(page, md, pte_dirty(huge_pte), 1);
1607 return 0;
1608 }
1609
1610 #else
1611 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1612 unsigned long addr, unsigned long end, struct mm_walk *walk)
1613 {
1614 return 0;
1615 }
1616 #endif
1617
1618 /*
1619 * Display pages allocated per node and memory policy via /proc.
1620 */
1621 static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1622 {
1623 struct numa_maps_private *numa_priv = m->private;
1624 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1625 struct vm_area_struct *vma = v;
1626 struct numa_maps *md = &numa_priv->md;
1627 struct file *file = vma->vm_file;
1628 struct mm_struct *mm = vma->vm_mm;
1629 struct mm_walk walk = {
1630 .hugetlb_entry = gather_hugetlb_stats,
1631 .pmd_entry = gather_pte_stats,
1632 .private = md,
1633 .mm = mm,
1634 };
1635 struct mempolicy *pol;
1636 char buffer[64];
1637 int nid;
1638
1639 if (!mm)
1640 return 0;
1641
1642 /* Ensure we start with an empty set of numa_maps statistics. */
1643 memset(md, 0, sizeof(*md));
1644
1645 pol = __get_vma_policy(vma, vma->vm_start);
1646 if (pol) {
1647 mpol_to_str(buffer, sizeof(buffer), pol);
1648 mpol_cond_put(pol);
1649 } else {
1650 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1651 }
1652
1653 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1654
1655 if (file) {
1656 seq_puts(m, " file=");
1657 seq_file_path(m, file, "\n\t= ");
1658 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1659 seq_puts(m, " heap");
1660 } else if (is_stack(proc_priv, vma, is_pid)) {
1661 seq_puts(m, " stack");
1662 }
1663
1664 if (is_vm_hugetlb_page(vma))
1665 seq_puts(m, " huge");
1666
1667 /* mmap_sem is held by m_start */
1668 walk_page_vma(vma, &walk);
1669
1670 if (!md->pages)
1671 goto out;
1672
1673 if (md->anon)
1674 seq_printf(m, " anon=%lu", md->anon);
1675
1676 if (md->dirty)
1677 seq_printf(m, " dirty=%lu", md->dirty);
1678
1679 if (md->pages != md->anon && md->pages != md->dirty)
1680 seq_printf(m, " mapped=%lu", md->pages);
1681
1682 if (md->mapcount_max > 1)
1683 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1684
1685 if (md->swapcache)
1686 seq_printf(m, " swapcache=%lu", md->swapcache);
1687
1688 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1689 seq_printf(m, " active=%lu", md->active);
1690
1691 if (md->writeback)
1692 seq_printf(m, " writeback=%lu", md->writeback);
1693
1694 for_each_node_state(nid, N_MEMORY)
1695 if (md->node[nid])
1696 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1697
1698 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1699 out:
1700 seq_putc(m, '\n');
1701 m_cache_vma(m, vma);
1702 return 0;
1703 }
1704
1705 static int show_pid_numa_map(struct seq_file *m, void *v)
1706 {
1707 return show_numa_map(m, v, 1);
1708 }
1709
1710 static int show_tid_numa_map(struct seq_file *m, void *v)
1711 {
1712 return show_numa_map(m, v, 0);
1713 }
1714
1715 static const struct seq_operations proc_pid_numa_maps_op = {
1716 .start = m_start,
1717 .next = m_next,
1718 .stop = m_stop,
1719 .show = show_pid_numa_map,
1720 };
1721
1722 static const struct seq_operations proc_tid_numa_maps_op = {
1723 .start = m_start,
1724 .next = m_next,
1725 .stop = m_stop,
1726 .show = show_tid_numa_map,
1727 };
1728
1729 static int numa_maps_open(struct inode *inode, struct file *file,
1730 const struct seq_operations *ops)
1731 {
1732 return proc_maps_open(inode, file, ops,
1733 sizeof(struct numa_maps_private));
1734 }
1735
1736 static int pid_numa_maps_open(struct inode *inode, struct file *file)
1737 {
1738 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1739 }
1740
1741 static int tid_numa_maps_open(struct inode *inode, struct file *file)
1742 {
1743 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1744 }
1745
1746 const struct file_operations proc_pid_numa_maps_operations = {
1747 .open = pid_numa_maps_open,
1748 .read = seq_read,
1749 .llseek = seq_lseek,
1750 .release = proc_map_release,
1751 };
1752
1753 const struct file_operations proc_tid_numa_maps_operations = {
1754 .open = tid_numa_maps_open,
1755 .read = seq_read,
1756 .llseek = seq_lseek,
1757 .release = proc_map_release,
1758 };
1759 #endif /* CONFIG_NUMA */
Linux kernel - Deliverables
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