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>
19 #include <asm/uaccess.h>
20 #include <asm/tlbflush.h>
23 void task_mem(struct seq_file *m, struct mm_struct *mm)
25 unsigned long data, text, lib, swap, ptes, pmds;
26 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
29 * Note: to minimize their overhead, mm maintains hiwater_vm and
30 * hiwater_rss only when about to *lower* total_vm or rss. Any
31 * collector of these hiwater stats must therefore get total_vm
32 * and rss too, which will usually be the higher. Barriers? not
33 * worth the effort, such snapshots can always be inconsistent.
35 hiwater_vm = total_vm = mm->total_vm;
36 if (hiwater_vm < mm->hiwater_vm)
37 hiwater_vm = mm->hiwater_vm;
38 hiwater_rss = total_rss = get_mm_rss(mm);
39 if (hiwater_rss < mm->hiwater_rss)
40 hiwater_rss = mm->hiwater_rss;
42 data = mm->total_vm - mm->shared_vm - mm->stack_vm;
43 text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
44 lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
45 swap = get_mm_counter(mm, MM_SWAPENTS);
46 ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
47 pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
62 hiwater_vm << (PAGE_SHIFT-10),
63 total_vm << (PAGE_SHIFT-10),
64 mm->locked_vm << (PAGE_SHIFT-10),
65 mm->pinned_vm << (PAGE_SHIFT-10),
66 hiwater_rss << (PAGE_SHIFT-10),
67 total_rss << (PAGE_SHIFT-10),
68 data << (PAGE_SHIFT-10),
69 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
72 swap << (PAGE_SHIFT-10));
73 hugetlb_report_usage(m, mm);
76 unsigned long task_vsize(struct mm_struct *mm)
78 return PAGE_SIZE * mm->total_vm;
81 unsigned long task_statm(struct mm_struct *mm,
82 unsigned long *shared, unsigned long *text,
83 unsigned long *data, unsigned long *resident)
85 *shared = get_mm_counter(mm, MM_FILEPAGES);
86 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
88 *data = mm->total_vm - mm->shared_vm;
89 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
95 * Save get_task_policy() for show_numa_map().
97 static void hold_task_mempolicy(struct proc_maps_private *priv)
99 struct task_struct *task = priv->task;
102 priv->task_mempolicy = get_task_policy(task);
103 mpol_get(priv->task_mempolicy);
106 static void release_task_mempolicy(struct proc_maps_private *priv)
108 mpol_put(priv->task_mempolicy);
111 static void hold_task_mempolicy(struct proc_maps_private *priv)
114 static void release_task_mempolicy(struct proc_maps_private *priv)
119 static void seq_print_vma_name(struct seq_file *m, struct vm_area_struct *vma)
121 const char __user *name = vma_get_anon_name(vma);
122 struct mm_struct *mm = vma->vm_mm;
124 unsigned long page_start_vaddr;
125 unsigned long page_offset;
126 unsigned long num_pages;
127 unsigned long max_len = NAME_MAX;
130 page_start_vaddr = (unsigned long)name & PAGE_MASK;
131 page_offset = (unsigned long)name - page_start_vaddr;
132 num_pages = DIV_ROUND_UP(page_offset + max_len, PAGE_SIZE);
134 seq_puts(m, "[anon:");
136 for (i = 0; i < num_pages; i++) {
143 pages_pinned = get_user_pages(current, mm, page_start_vaddr,
144 1, 0, 0, &page, NULL);
145 if (pages_pinned < 1) {
146 seq_puts(m, "<fault>]");
150 kaddr = (const char *)kmap(page);
151 len = min(max_len, PAGE_SIZE - page_offset);
152 write_len = strnlen(kaddr + page_offset, len);
153 seq_write(m, kaddr + page_offset, write_len);
157 /* if strnlen hit a null terminator then we're done */
158 if (write_len != len)
163 page_start_vaddr += PAGE_SIZE;
169 static void vma_stop(struct proc_maps_private *priv)
171 struct mm_struct *mm = priv->mm;
173 release_task_mempolicy(priv);
174 up_read(&mm->mmap_sem);
178 static struct vm_area_struct *
179 m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
181 if (vma == priv->tail_vma)
183 return vma->vm_next ?: priv->tail_vma;
186 static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma)
188 if (m->count < m->size) /* vma is copied successfully */
189 m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL;
192 static void *m_start(struct seq_file *m, loff_t *ppos)
194 struct proc_maps_private *priv = m->private;
195 unsigned long last_addr = m->version;
196 struct mm_struct *mm;
197 struct vm_area_struct *vma;
198 unsigned int pos = *ppos;
200 /* See m_cache_vma(). Zero at the start or after lseek. */
201 if (last_addr == -1UL)
204 priv->task = get_proc_task(priv->inode);
206 return ERR_PTR(-ESRCH);
209 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
212 down_read(&mm->mmap_sem);
213 hold_task_mempolicy(priv);
214 priv->tail_vma = get_gate_vma(mm);
217 vma = find_vma(mm, last_addr);
218 if (vma && (vma = m_next_vma(priv, vma)))
223 if (pos < mm->map_count) {
224 for (vma = mm->mmap; pos; pos--) {
225 m->version = vma->vm_start;
231 /* we do not bother to update m->version in this case */
232 if (pos == mm->map_count && priv->tail_vma)
233 return priv->tail_vma;
239 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
241 struct proc_maps_private *priv = m->private;
242 struct vm_area_struct *next;
245 next = m_next_vma(priv, v);
251 static void m_stop(struct seq_file *m, void *v)
253 struct proc_maps_private *priv = m->private;
255 if (!IS_ERR_OR_NULL(v))
258 put_task_struct(priv->task);
263 static int proc_maps_open(struct inode *inode, struct file *file,
264 const struct seq_operations *ops, int psize)
266 struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
272 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
273 if (IS_ERR(priv->mm)) {
274 int err = PTR_ERR(priv->mm);
276 seq_release_private(inode, file);
283 static int proc_map_release(struct inode *inode, struct file *file)
285 struct seq_file *seq = file->private_data;
286 struct proc_maps_private *priv = seq->private;
291 return seq_release_private(inode, file);
294 static int do_maps_open(struct inode *inode, struct file *file,
295 const struct seq_operations *ops)
297 return proc_maps_open(inode, file, ops,
298 sizeof(struct proc_maps_private));
302 * Indicate if the VMA is a stack for the given task; for
303 * /proc/PID/maps that is the stack of the main task.
305 static int is_stack(struct proc_maps_private *priv,
306 struct vm_area_struct *vma, int is_pid)
311 stack = vma->vm_start <= vma->vm_mm->start_stack &&
312 vma->vm_end >= vma->vm_mm->start_stack;
314 struct inode *inode = priv->inode;
315 struct task_struct *task;
318 task = pid_task(proc_pid(inode), PIDTYPE_PID);
320 stack = vma_is_stack_for_task(vma, task);
327 show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
329 struct mm_struct *mm = vma->vm_mm;
330 struct file *file = vma->vm_file;
331 struct proc_maps_private *priv = m->private;
332 vm_flags_t flags = vma->vm_flags;
333 unsigned long ino = 0;
334 unsigned long long pgoff = 0;
335 unsigned long start, end;
337 const char *name = NULL;
340 struct inode *inode = file_inode(vma->vm_file);
341 dev = inode->i_sb->s_dev;
343 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
346 /* We don't show the stack guard page in /proc/maps */
347 start = vma->vm_start;
348 if (stack_guard_page_start(vma, start))
351 if (stack_guard_page_end(vma, end))
354 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
355 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
358 flags & VM_READ ? 'r' : '-',
359 flags & VM_WRITE ? 'w' : '-',
360 flags & VM_EXEC ? 'x' : '-',
361 flags & VM_MAYSHARE ? 's' : 'p',
363 MAJOR(dev), MINOR(dev), ino);
366 * Print the dentry name for named mappings, and a
367 * special [heap] marker for the heap:
371 seq_file_path(m, file, "\n");
375 if (vma->vm_ops && vma->vm_ops->name) {
376 name = vma->vm_ops->name(vma);
381 name = arch_vma_name(vma);
388 if (vma->vm_start <= mm->brk &&
389 vma->vm_end >= mm->start_brk) {
394 if (is_stack(priv, vma, is_pid)) {
398 if (vma_get_anon_name(vma)) {
400 seq_print_vma_name(m, vma);
412 static int show_map(struct seq_file *m, void *v, int is_pid)
414 show_map_vma(m, v, is_pid);
419 static int show_pid_map(struct seq_file *m, void *v)
421 return show_map(m, v, 1);
424 static int show_tid_map(struct seq_file *m, void *v)
426 return show_map(m, v, 0);
429 static const struct seq_operations proc_pid_maps_op = {
436 static const struct seq_operations proc_tid_maps_op = {
443 static int pid_maps_open(struct inode *inode, struct file *file)
445 return do_maps_open(inode, file, &proc_pid_maps_op);
448 static int tid_maps_open(struct inode *inode, struct file *file)
450 return do_maps_open(inode, file, &proc_tid_maps_op);
453 const struct file_operations proc_pid_maps_operations = {
454 .open = pid_maps_open,
457 .release = proc_map_release,
460 const struct file_operations proc_tid_maps_operations = {
461 .open = tid_maps_open,
464 .release = proc_map_release,
468 * Proportional Set Size(PSS): my share of RSS.
470 * PSS of a process is the count of pages it has in memory, where each
471 * page is divided by the number of processes sharing it. So if a
472 * process has 1000 pages all to itself, and 1000 shared with one other
473 * process, its PSS will be 1500.
475 * To keep (accumulated) division errors low, we adopt a 64bit
476 * fixed-point pss counter to minimize division errors. So (pss >>
477 * PSS_SHIFT) would be the real byte count.
479 * A shift of 12 before division means (assuming 4K page size):
480 * - 1M 3-user-pages add up to 8KB errors;
481 * - supports mapcount up to 2^24, or 16M;
482 * - supports PSS up to 2^52 bytes, or 4PB.
486 #ifdef CONFIG_PROC_PAGE_MONITOR
487 struct mem_size_stats {
488 unsigned long resident;
489 unsigned long shared_clean;
490 unsigned long shared_dirty;
491 unsigned long private_clean;
492 unsigned long private_dirty;
493 unsigned long referenced;
494 unsigned long anonymous;
495 unsigned long anonymous_thp;
497 unsigned long shared_hugetlb;
498 unsigned long private_hugetlb;
503 static void smaps_account(struct mem_size_stats *mss, struct page *page,
504 unsigned long size, bool young, bool dirty)
509 mss->anonymous += size;
511 mss->resident += size;
512 /* Accumulate the size in pages that have been accessed. */
513 if (young || page_is_young(page) || PageReferenced(page))
514 mss->referenced += size;
515 mapcount = page_mapcount(page);
519 if (dirty || PageDirty(page))
520 mss->shared_dirty += size;
522 mss->shared_clean += size;
523 pss_delta = (u64)size << PSS_SHIFT;
524 do_div(pss_delta, mapcount);
525 mss->pss += pss_delta;
527 if (dirty || PageDirty(page))
528 mss->private_dirty += size;
530 mss->private_clean += size;
531 mss->pss += (u64)size << PSS_SHIFT;
535 static void smaps_pte_entry(pte_t *pte, unsigned long addr,
536 struct mm_walk *walk)
538 struct mem_size_stats *mss = walk->private;
539 struct vm_area_struct *vma = walk->vma;
540 struct page *page = NULL;
542 if (pte_present(*pte)) {
543 page = vm_normal_page(vma, addr, *pte);
544 } else if (is_swap_pte(*pte)) {
545 swp_entry_t swpent = pte_to_swp_entry(*pte);
547 if (!non_swap_entry(swpent)) {
550 mss->swap += PAGE_SIZE;
551 mapcount = swp_swapcount(swpent);
553 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
555 do_div(pss_delta, mapcount);
556 mss->swap_pss += pss_delta;
558 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
560 } else if (is_migration_entry(swpent))
561 page = migration_entry_to_page(swpent);
566 smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte));
569 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
570 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
571 struct mm_walk *walk)
573 struct mem_size_stats *mss = walk->private;
574 struct vm_area_struct *vma = walk->vma;
577 /* FOLL_DUMP will return -EFAULT on huge zero page */
578 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
579 if (IS_ERR_OR_NULL(page))
581 mss->anonymous_thp += HPAGE_PMD_SIZE;
582 smaps_account(mss, page, HPAGE_PMD_SIZE,
583 pmd_young(*pmd), pmd_dirty(*pmd));
586 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
587 struct mm_walk *walk)
592 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
593 struct mm_walk *walk)
595 struct vm_area_struct *vma = walk->vma;
599 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
600 smaps_pmd_entry(pmd, addr, walk);
605 if (pmd_trans_unstable(pmd))
608 * The mmap_sem held all the way back in m_start() is what
609 * keeps khugepaged out of here and from collapsing things
612 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
613 for (; addr != end; pte++, addr += PAGE_SIZE)
614 smaps_pte_entry(pte, addr, walk);
615 pte_unmap_unlock(pte - 1, ptl);
620 static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
623 * Don't forget to update Documentation/ on changes.
625 static const char mnemonics[BITS_PER_LONG][2] = {
627 * In case if we meet a flag we don't know about.
629 [0 ... (BITS_PER_LONG-1)] = "??",
631 [ilog2(VM_READ)] = "rd",
632 [ilog2(VM_WRITE)] = "wr",
633 [ilog2(VM_EXEC)] = "ex",
634 [ilog2(VM_SHARED)] = "sh",
635 [ilog2(VM_MAYREAD)] = "mr",
636 [ilog2(VM_MAYWRITE)] = "mw",
637 [ilog2(VM_MAYEXEC)] = "me",
638 [ilog2(VM_MAYSHARE)] = "ms",
639 [ilog2(VM_GROWSDOWN)] = "gd",
640 [ilog2(VM_PFNMAP)] = "pf",
641 [ilog2(VM_DENYWRITE)] = "dw",
642 #ifdef CONFIG_X86_INTEL_MPX
643 [ilog2(VM_MPX)] = "mp",
645 [ilog2(VM_LOCKED)] = "lo",
646 [ilog2(VM_IO)] = "io",
647 [ilog2(VM_SEQ_READ)] = "sr",
648 [ilog2(VM_RAND_READ)] = "rr",
649 [ilog2(VM_DONTCOPY)] = "dc",
650 [ilog2(VM_DONTEXPAND)] = "de",
651 [ilog2(VM_ACCOUNT)] = "ac",
652 [ilog2(VM_NORESERVE)] = "nr",
653 [ilog2(VM_HUGETLB)] = "ht",
654 [ilog2(VM_ARCH_1)] = "ar",
655 [ilog2(VM_DONTDUMP)] = "dd",
656 #ifdef CONFIG_MEM_SOFT_DIRTY
657 [ilog2(VM_SOFTDIRTY)] = "sd",
659 [ilog2(VM_MIXEDMAP)] = "mm",
660 [ilog2(VM_HUGEPAGE)] = "hg",
661 [ilog2(VM_NOHUGEPAGE)] = "nh",
662 [ilog2(VM_MERGEABLE)] = "mg",
663 [ilog2(VM_UFFD_MISSING)]= "um",
664 [ilog2(VM_UFFD_WP)] = "uw",
668 seq_puts(m, "VmFlags: ");
669 for (i = 0; i < BITS_PER_LONG; i++) {
670 if (vma->vm_flags & (1UL << i)) {
671 seq_printf(m, "%c%c ",
672 mnemonics[i][0], mnemonics[i][1]);
678 #ifdef CONFIG_HUGETLB_PAGE
679 static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
680 unsigned long addr, unsigned long end,
681 struct mm_walk *walk)
683 struct mem_size_stats *mss = walk->private;
684 struct vm_area_struct *vma = walk->vma;
685 struct page *page = NULL;
687 if (pte_present(*pte)) {
688 page = vm_normal_page(vma, addr, *pte);
689 } else if (is_swap_pte(*pte)) {
690 swp_entry_t swpent = pte_to_swp_entry(*pte);
692 if (is_migration_entry(swpent))
693 page = migration_entry_to_page(swpent);
696 int mapcount = page_mapcount(page);
699 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
701 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
705 #endif /* HUGETLB_PAGE */
707 static int show_smap(struct seq_file *m, void *v, int is_pid)
709 struct vm_area_struct *vma = v;
710 struct mem_size_stats mss;
711 struct mm_walk smaps_walk = {
712 .pmd_entry = smaps_pte_range,
713 #ifdef CONFIG_HUGETLB_PAGE
714 .hugetlb_entry = smaps_hugetlb_range,
720 memset(&mss, 0, sizeof mss);
721 /* mmap_sem is held in m_start */
722 walk_page_vma(vma, &smaps_walk);
724 show_map_vma(m, vma, is_pid);
726 if (vma_get_anon_name(vma)) {
727 seq_puts(m, "Name: ");
728 seq_print_vma_name(m, vma);
736 "Shared_Clean: %8lu kB\n"
737 "Shared_Dirty: %8lu kB\n"
738 "Private_Clean: %8lu kB\n"
739 "Private_Dirty: %8lu kB\n"
740 "Referenced: %8lu kB\n"
741 "Anonymous: %8lu kB\n"
742 "AnonHugePages: %8lu kB\n"
743 "Shared_Hugetlb: %8lu kB\n"
744 "Private_Hugetlb: %7lu kB\n"
747 "KernelPageSize: %8lu kB\n"
748 "MMUPageSize: %8lu kB\n"
750 (vma->vm_end - vma->vm_start) >> 10,
752 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
753 mss.shared_clean >> 10,
754 mss.shared_dirty >> 10,
755 mss.private_clean >> 10,
756 mss.private_dirty >> 10,
757 mss.referenced >> 10,
759 mss.anonymous_thp >> 10,
760 mss.shared_hugetlb >> 10,
761 mss.private_hugetlb >> 10,
763 (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
764 vma_kernel_pagesize(vma) >> 10,
765 vma_mmu_pagesize(vma) >> 10,
766 (vma->vm_flags & VM_LOCKED) ?
767 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
769 show_smap_vma_flags(m, vma);
774 static int show_pid_smap(struct seq_file *m, void *v)
776 return show_smap(m, v, 1);
779 static int show_tid_smap(struct seq_file *m, void *v)
781 return show_smap(m, v, 0);
784 static const struct seq_operations proc_pid_smaps_op = {
788 .show = show_pid_smap
791 static const struct seq_operations proc_tid_smaps_op = {
795 .show = show_tid_smap
798 static int pid_smaps_open(struct inode *inode, struct file *file)
800 return do_maps_open(inode, file, &proc_pid_smaps_op);
803 static int tid_smaps_open(struct inode *inode, struct file *file)
805 return do_maps_open(inode, file, &proc_tid_smaps_op);
808 const struct file_operations proc_pid_smaps_operations = {
809 .open = pid_smaps_open,
812 .release = proc_map_release,
815 const struct file_operations proc_tid_smaps_operations = {
816 .open = tid_smaps_open,
819 .release = proc_map_release,
822 enum clear_refs_types {
826 CLEAR_REFS_SOFT_DIRTY,
827 CLEAR_REFS_MM_HIWATER_RSS,
831 struct clear_refs_private {
832 enum clear_refs_types type;
835 #ifdef CONFIG_MEM_SOFT_DIRTY
836 static inline void clear_soft_dirty(struct vm_area_struct *vma,
837 unsigned long addr, pte_t *pte)
840 * The soft-dirty tracker uses #PF-s to catch writes
841 * to pages, so write-protect the pte as well. See the
842 * Documentation/vm/soft-dirty.txt for full description
843 * of how soft-dirty works.
847 if (pte_present(ptent)) {
848 ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
849 ptent = pte_wrprotect(ptent);
850 ptent = pte_clear_soft_dirty(ptent);
851 ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
852 } else if (is_swap_pte(ptent)) {
853 ptent = pte_swp_clear_soft_dirty(ptent);
854 set_pte_at(vma->vm_mm, addr, pte, ptent);
858 static inline void clear_soft_dirty(struct vm_area_struct *vma,
859 unsigned long addr, pte_t *pte)
864 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
865 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
866 unsigned long addr, pmd_t *pmdp)
868 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
870 pmd = pmd_wrprotect(pmd);
871 pmd = pmd_clear_soft_dirty(pmd);
873 if (vma->vm_flags & VM_SOFTDIRTY)
874 vma->vm_flags &= ~VM_SOFTDIRTY;
876 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
879 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
880 unsigned long addr, pmd_t *pmdp)
885 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
886 unsigned long end, struct mm_walk *walk)
888 struct clear_refs_private *cp = walk->private;
889 struct vm_area_struct *vma = walk->vma;
894 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
895 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
896 clear_soft_dirty_pmd(vma, addr, pmd);
900 page = pmd_page(*pmd);
902 /* Clear accessed and referenced bits. */
903 pmdp_test_and_clear_young(vma, addr, pmd);
904 test_and_clear_page_young(page);
905 ClearPageReferenced(page);
911 if (pmd_trans_unstable(pmd))
914 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
915 for (; addr != end; pte++, addr += PAGE_SIZE) {
918 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
919 clear_soft_dirty(vma, addr, pte);
923 if (!pte_present(ptent))
926 page = vm_normal_page(vma, addr, ptent);
930 /* Clear accessed and referenced bits. */
931 ptep_test_and_clear_young(vma, addr, pte);
932 test_and_clear_page_young(page);
933 ClearPageReferenced(page);
935 pte_unmap_unlock(pte - 1, ptl);
940 static int clear_refs_test_walk(unsigned long start, unsigned long end,
941 struct mm_walk *walk)
943 struct clear_refs_private *cp = walk->private;
944 struct vm_area_struct *vma = walk->vma;
946 if (vma->vm_flags & VM_PFNMAP)
950 * Writing 1 to /proc/pid/clear_refs affects all pages.
951 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
952 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
953 * Writing 4 to /proc/pid/clear_refs affects all pages.
955 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
957 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
962 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
963 size_t count, loff_t *ppos)
965 struct task_struct *task;
966 char buffer[PROC_NUMBUF];
967 struct mm_struct *mm;
968 struct vm_area_struct *vma;
969 enum clear_refs_types type;
973 memset(buffer, 0, sizeof(buffer));
974 if (count > sizeof(buffer) - 1)
975 count = sizeof(buffer) - 1;
976 if (copy_from_user(buffer, buf, count))
978 rv = kstrtoint(strstrip(buffer), 10, &itype);
981 type = (enum clear_refs_types)itype;
982 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
985 task = get_proc_task(file_inode(file));
988 mm = get_task_mm(task);
990 struct clear_refs_private cp = {
993 struct mm_walk clear_refs_walk = {
994 .pmd_entry = clear_refs_pte_range,
995 .test_walk = clear_refs_test_walk,
1000 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1002 * Writing 5 to /proc/pid/clear_refs resets the peak
1003 * resident set size to this mm's current rss value.
1005 down_write(&mm->mmap_sem);
1006 reset_mm_hiwater_rss(mm);
1007 up_write(&mm->mmap_sem);
1011 down_read(&mm->mmap_sem);
1012 if (type == CLEAR_REFS_SOFT_DIRTY) {
1013 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1014 if (!(vma->vm_flags & VM_SOFTDIRTY))
1016 up_read(&mm->mmap_sem);
1017 down_write(&mm->mmap_sem);
1018 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1019 vma->vm_flags &= ~VM_SOFTDIRTY;
1020 vma_set_page_prot(vma);
1022 downgrade_write(&mm->mmap_sem);
1025 mmu_notifier_invalidate_range_start(mm, 0, -1);
1027 walk_page_range(0, ~0UL, &clear_refs_walk);
1028 if (type == CLEAR_REFS_SOFT_DIRTY)
1029 mmu_notifier_invalidate_range_end(mm, 0, -1);
1031 up_read(&mm->mmap_sem);
1035 put_task_struct(task);
1040 const struct file_operations proc_clear_refs_operations = {
1041 .write = clear_refs_write,
1042 .llseek = noop_llseek,
1049 struct pagemapread {
1050 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1051 pagemap_entry_t *buffer;
1055 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1056 #define PAGEMAP_WALK_MASK (PMD_MASK)
1058 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1059 #define PM_PFRAME_BITS 55
1060 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1061 #define PM_SOFT_DIRTY BIT_ULL(55)
1062 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1063 #define PM_FILE BIT_ULL(61)
1064 #define PM_SWAP BIT_ULL(62)
1065 #define PM_PRESENT BIT_ULL(63)
1067 #define PM_END_OF_BUFFER 1
1069 static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1071 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1074 static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1075 struct pagemapread *pm)
1077 pm->buffer[pm->pos++] = *pme;
1078 if (pm->pos >= pm->len)
1079 return PM_END_OF_BUFFER;
1083 static int pagemap_pte_hole(unsigned long start, unsigned long end,
1084 struct mm_walk *walk)
1086 struct pagemapread *pm = walk->private;
1087 unsigned long addr = start;
1090 while (addr < end) {
1091 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1092 pagemap_entry_t pme = make_pme(0, 0);
1093 /* End of address space hole, which we mark as non-present. */
1094 unsigned long hole_end;
1097 hole_end = min(end, vma->vm_start);
1101 for (; addr < hole_end; addr += PAGE_SIZE) {
1102 err = add_to_pagemap(addr, &pme, pm);
1110 /* Addresses in the VMA. */
1111 if (vma->vm_flags & VM_SOFTDIRTY)
1112 pme = make_pme(0, PM_SOFT_DIRTY);
1113 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1114 err = add_to_pagemap(addr, &pme, pm);
1123 static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1124 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1126 u64 frame = 0, flags = 0;
1127 struct page *page = NULL;
1129 if (pte_present(pte)) {
1131 frame = pte_pfn(pte);
1132 flags |= PM_PRESENT;
1133 page = vm_normal_page(vma, addr, pte);
1134 if (pte_soft_dirty(pte))
1135 flags |= PM_SOFT_DIRTY;
1136 } else if (is_swap_pte(pte)) {
1138 if (pte_swp_soft_dirty(pte))
1139 flags |= PM_SOFT_DIRTY;
1140 entry = pte_to_swp_entry(pte);
1141 frame = swp_type(entry) |
1142 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1144 if (is_migration_entry(entry))
1145 page = migration_entry_to_page(entry);
1148 if (page && !PageAnon(page))
1150 if (page && page_mapcount(page) == 1)
1151 flags |= PM_MMAP_EXCLUSIVE;
1152 if (vma->vm_flags & VM_SOFTDIRTY)
1153 flags |= PM_SOFT_DIRTY;
1155 return make_pme(frame, flags);
1158 static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1159 struct mm_walk *walk)
1161 struct vm_area_struct *vma = walk->vma;
1162 struct pagemapread *pm = walk->private;
1164 pte_t *pte, *orig_pte;
1167 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1168 if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) {
1169 u64 flags = 0, frame = 0;
1172 if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
1173 flags |= PM_SOFT_DIRTY;
1176 * Currently pmd for thp is always present because thp
1177 * can not be swapped-out, migrated, or HWPOISONed
1178 * (split in such cases instead.)
1179 * This if-check is just to prepare for future implementation.
1181 if (pmd_present(pmd)) {
1182 struct page *page = pmd_page(pmd);
1184 if (page_mapcount(page) == 1)
1185 flags |= PM_MMAP_EXCLUSIVE;
1187 flags |= PM_PRESENT;
1189 frame = pmd_pfn(pmd) +
1190 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1193 for (; addr != end; addr += PAGE_SIZE) {
1194 pagemap_entry_t pme = make_pme(frame, flags);
1196 err = add_to_pagemap(addr, &pme, pm);
1199 if (pm->show_pfn && (flags & PM_PRESENT))
1206 if (pmd_trans_unstable(pmdp))
1208 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1211 * We can assume that @vma always points to a valid one and @end never
1212 * goes beyond vma->vm_end.
1214 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1215 for (; addr < end; pte++, addr += PAGE_SIZE) {
1216 pagemap_entry_t pme;
1218 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1219 err = add_to_pagemap(addr, &pme, pm);
1223 pte_unmap_unlock(orig_pte, ptl);
1230 #ifdef CONFIG_HUGETLB_PAGE
1231 /* This function walks within one hugetlb entry in the single call */
1232 static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1233 unsigned long addr, unsigned long end,
1234 struct mm_walk *walk)
1236 struct pagemapread *pm = walk->private;
1237 struct vm_area_struct *vma = walk->vma;
1238 u64 flags = 0, frame = 0;
1242 if (vma->vm_flags & VM_SOFTDIRTY)
1243 flags |= PM_SOFT_DIRTY;
1245 pte = huge_ptep_get(ptep);
1246 if (pte_present(pte)) {
1247 struct page *page = pte_page(pte);
1249 if (!PageAnon(page))
1252 if (page_mapcount(page) == 1)
1253 flags |= PM_MMAP_EXCLUSIVE;
1255 flags |= PM_PRESENT;
1257 frame = pte_pfn(pte) +
1258 ((addr & ~hmask) >> PAGE_SHIFT);
1261 for (; addr != end; addr += PAGE_SIZE) {
1262 pagemap_entry_t pme = make_pme(frame, flags);
1264 err = add_to_pagemap(addr, &pme, pm);
1267 if (pm->show_pfn && (flags & PM_PRESENT))
1275 #endif /* HUGETLB_PAGE */
1278 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1280 * For each page in the address space, this file contains one 64-bit entry
1281 * consisting of the following:
1283 * Bits 0-54 page frame number (PFN) if present
1284 * Bits 0-4 swap type if swapped
1285 * Bits 5-54 swap offset if swapped
1286 * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt)
1287 * Bit 56 page exclusively mapped
1289 * Bit 61 page is file-page or shared-anon
1290 * Bit 62 page swapped
1291 * Bit 63 page present
1293 * If the page is not present but in swap, then the PFN contains an
1294 * encoding of the swap file number and the page's offset into the
1295 * swap. Unmapped pages return a null PFN. This allows determining
1296 * precisely which pages are mapped (or in swap) and comparing mapped
1297 * pages between processes.
1299 * Efficient users of this interface will use /proc/pid/maps to
1300 * determine which areas of memory are actually mapped and llseek to
1301 * skip over unmapped regions.
1303 static ssize_t pagemap_read(struct file *file, char __user *buf,
1304 size_t count, loff_t *ppos)
1306 struct mm_struct *mm = file->private_data;
1307 struct pagemapread pm;
1308 struct mm_walk pagemap_walk = {};
1310 unsigned long svpfn;
1311 unsigned long start_vaddr;
1312 unsigned long end_vaddr;
1313 int ret = 0, copied = 0;
1315 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
1319 /* file position must be aligned */
1320 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1327 /* do not disclose physical addresses: attack vector */
1328 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1330 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1331 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
1336 pagemap_walk.pmd_entry = pagemap_pmd_range;
1337 pagemap_walk.pte_hole = pagemap_pte_hole;
1338 #ifdef CONFIG_HUGETLB_PAGE
1339 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1341 pagemap_walk.mm = mm;
1342 pagemap_walk.private = ±
1345 svpfn = src / PM_ENTRY_BYTES;
1346 start_vaddr = svpfn << PAGE_SHIFT;
1347 end_vaddr = mm->task_size;
1349 /* watch out for wraparound */
1350 if (svpfn > mm->task_size >> PAGE_SHIFT)
1351 start_vaddr = end_vaddr;
1354 * The odds are that this will stop walking way
1355 * before end_vaddr, because the length of the
1356 * user buffer is tracked in "pm", and the walk
1357 * will stop when we hit the end of the buffer.
1360 while (count && (start_vaddr < end_vaddr)) {
1365 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1367 if (end < start_vaddr || end > end_vaddr)
1369 down_read(&mm->mmap_sem);
1370 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1371 up_read(&mm->mmap_sem);
1374 len = min(count, PM_ENTRY_BYTES * pm.pos);
1375 if (copy_to_user(buf, pm.buffer, len)) {
1384 if (!ret || ret == PM_END_OF_BUFFER)
1395 static int pagemap_open(struct inode *inode, struct file *file)
1397 struct mm_struct *mm;
1399 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1402 file->private_data = mm;
1406 static int pagemap_release(struct inode *inode, struct file *file)
1408 struct mm_struct *mm = file->private_data;
1415 const struct file_operations proc_pagemap_operations = {
1416 .llseek = mem_lseek, /* borrow this */
1417 .read = pagemap_read,
1418 .open = pagemap_open,
1419 .release = pagemap_release,
1421 #endif /* CONFIG_PROC_PAGE_MONITOR */
1426 unsigned long pages;
1428 unsigned long active;
1429 unsigned long writeback;
1430 unsigned long mapcount_max;
1431 unsigned long dirty;
1432 unsigned long swapcache;
1433 unsigned long node[MAX_NUMNODES];
1436 struct numa_maps_private {
1437 struct proc_maps_private proc_maps;
1438 struct numa_maps md;
1441 static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1442 unsigned long nr_pages)
1444 int count = page_mapcount(page);
1446 md->pages += nr_pages;
1447 if (pte_dirty || PageDirty(page))
1448 md->dirty += nr_pages;
1450 if (PageSwapCache(page))
1451 md->swapcache += nr_pages;
1453 if (PageActive(page) || PageUnevictable(page))
1454 md->active += nr_pages;
1456 if (PageWriteback(page))
1457 md->writeback += nr_pages;
1460 md->anon += nr_pages;
1462 if (count > md->mapcount_max)
1463 md->mapcount_max = count;
1465 md->node[page_to_nid(page)] += nr_pages;
1468 static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1474 if (!pte_present(pte))
1477 page = vm_normal_page(vma, addr, pte);
1481 if (PageReserved(page))
1484 nid = page_to_nid(page);
1485 if (!node_isset(nid, node_states[N_MEMORY]))
1491 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1492 static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1493 struct vm_area_struct *vma,
1499 if (!pmd_present(pmd))
1502 page = vm_normal_page_pmd(vma, addr, pmd);
1506 if (PageReserved(page))
1509 nid = page_to_nid(page);
1510 if (!node_isset(nid, node_states[N_MEMORY]))
1517 static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1518 unsigned long end, struct mm_walk *walk)
1520 struct numa_maps *md = walk->private;
1521 struct vm_area_struct *vma = walk->vma;
1526 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1527 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
1530 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1532 gather_stats(page, md, pmd_dirty(*pmd),
1533 HPAGE_PMD_SIZE/PAGE_SIZE);
1538 if (pmd_trans_unstable(pmd))
1541 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1543 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1546 gather_stats(page, md, pte_dirty(*pte), 1);
1548 } while (pte++, addr += PAGE_SIZE, addr != end);
1549 pte_unmap_unlock(orig_pte, ptl);
1552 #ifdef CONFIG_HUGETLB_PAGE
1553 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1554 unsigned long addr, unsigned long end, struct mm_walk *walk)
1556 pte_t huge_pte = huge_ptep_get(pte);
1557 struct numa_maps *md;
1560 if (!pte_present(huge_pte))
1563 page = pte_page(huge_pte);
1568 gather_stats(page, md, pte_dirty(huge_pte), 1);
1573 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1574 unsigned long addr, unsigned long end, struct mm_walk *walk)
1581 * Display pages allocated per node and memory policy via /proc.
1583 static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1585 struct numa_maps_private *numa_priv = m->private;
1586 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1587 struct vm_area_struct *vma = v;
1588 struct numa_maps *md = &numa_priv->md;
1589 struct file *file = vma->vm_file;
1590 struct mm_struct *mm = vma->vm_mm;
1591 struct mm_walk walk = {
1592 .hugetlb_entry = gather_hugetlb_stats,
1593 .pmd_entry = gather_pte_stats,
1597 struct mempolicy *pol;
1604 /* Ensure we start with an empty set of numa_maps statistics. */
1605 memset(md, 0, sizeof(*md));
1607 pol = __get_vma_policy(vma, vma->vm_start);
1609 mpol_to_str(buffer, sizeof(buffer), pol);
1612 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1615 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1618 seq_puts(m, " file=");
1619 seq_file_path(m, file, "\n\t= ");
1620 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1621 seq_puts(m, " heap");
1622 } else if (is_stack(proc_priv, vma, is_pid)) {
1623 seq_puts(m, " stack");
1626 if (is_vm_hugetlb_page(vma))
1627 seq_puts(m, " huge");
1629 /* mmap_sem is held by m_start */
1630 walk_page_vma(vma, &walk);
1636 seq_printf(m, " anon=%lu", md->anon);
1639 seq_printf(m, " dirty=%lu", md->dirty);
1641 if (md->pages != md->anon && md->pages != md->dirty)
1642 seq_printf(m, " mapped=%lu", md->pages);
1644 if (md->mapcount_max > 1)
1645 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1648 seq_printf(m, " swapcache=%lu", md->swapcache);
1650 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1651 seq_printf(m, " active=%lu", md->active);
1654 seq_printf(m, " writeback=%lu", md->writeback);
1656 for_each_node_state(nid, N_MEMORY)
1658 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1660 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1663 m_cache_vma(m, vma);
1667 static int show_pid_numa_map(struct seq_file *m, void *v)
1669 return show_numa_map(m, v, 1);
1672 static int show_tid_numa_map(struct seq_file *m, void *v)
1674 return show_numa_map(m, v, 0);
1677 static const struct seq_operations proc_pid_numa_maps_op = {
1681 .show = show_pid_numa_map,
1684 static const struct seq_operations proc_tid_numa_maps_op = {
1688 .show = show_tid_numa_map,
1691 static int numa_maps_open(struct inode *inode, struct file *file,
1692 const struct seq_operations *ops)
1694 return proc_maps_open(inode, file, ops,
1695 sizeof(struct numa_maps_private));
1698 static int pid_numa_maps_open(struct inode *inode, struct file *file)
1700 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1703 static int tid_numa_maps_open(struct inode *inode, struct file *file)
1705 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1708 const struct file_operations proc_pid_numa_maps_operations = {
1709 .open = pid_numa_maps_open,
1711 .llseek = seq_lseek,
1712 .release = proc_map_release,
1715 const struct file_operations proc_tid_numa_maps_operations = {
1716 .open = tid_numa_maps_open,
1718 .llseek = seq_lseek,
1719 .release = proc_map_release,
1721 #endif /* CONFIG_NUMA */