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>
20 #include <asm/uaccess.h>
21 #include <asm/tlbflush.h>
24 void task_mem(struct seq_file *m, struct mm_struct *mm)
26 unsigned long text, lib, swap, ptes, pmds, anon, file, shmem;
27 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
29 anon = get_mm_counter(mm, MM_ANONPAGES);
30 file = get_mm_counter(mm, MM_FILEPAGES);
31 shmem = get_mm_counter(mm, MM_SHMEMPAGES);
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.
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;
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);
61 "RssShmem:\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,
82 swap << (PAGE_SHIFT-10));
83 hugetlb_report_usage(m, mm);
86 unsigned long task_vsize(struct mm_struct *mm)
88 return PAGE_SIZE * mm->total_vm;
91 unsigned long task_statm(struct mm_struct *mm,
92 unsigned long *shared, unsigned long *text,
93 unsigned long *data, unsigned long *resident)
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))
99 *data = mm->data_vm + mm->stack_vm;
100 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
106 * Save get_task_policy() for show_numa_map().
108 static void hold_task_mempolicy(struct proc_maps_private *priv)
110 struct task_struct *task = priv->task;
113 priv->task_mempolicy = get_task_policy(task);
114 mpol_get(priv->task_mempolicy);
117 static void release_task_mempolicy(struct proc_maps_private *priv)
119 mpol_put(priv->task_mempolicy);
122 static void hold_task_mempolicy(struct proc_maps_private *priv)
125 static void release_task_mempolicy(struct proc_maps_private *priv)
130 static void vma_stop(struct proc_maps_private *priv)
132 struct mm_struct *mm = priv->mm;
134 release_task_mempolicy(priv);
135 up_read(&mm->mmap_sem);
139 static struct vm_area_struct *
140 m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
142 if (vma == priv->tail_vma)
144 return vma->vm_next ?: priv->tail_vma;
147 static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma)
149 if (m->count < m->size) /* vma is copied successfully */
150 m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL;
153 static void *m_start(struct seq_file *m, loff_t *ppos)
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;
161 /* See m_cache_vma(). Zero at the start or after lseek. */
162 if (last_addr == -1UL)
165 priv->task = get_proc_task(priv->inode);
167 return ERR_PTR(-ESRCH);
170 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
173 down_read(&mm->mmap_sem);
174 hold_task_mempolicy(priv);
175 priv->tail_vma = get_gate_vma(mm);
178 vma = find_vma(mm, last_addr - 1);
179 if (vma && vma->vm_start <= last_addr)
180 vma = m_next_vma(priv, vma);
186 if (pos < mm->map_count) {
187 for (vma = mm->mmap; pos; pos--) {
188 m->version = vma->vm_start;
194 /* we do not bother to update m->version in this case */
195 if (pos == mm->map_count && priv->tail_vma)
196 return priv->tail_vma;
202 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
204 struct proc_maps_private *priv = m->private;
205 struct vm_area_struct *next;
208 next = m_next_vma(priv, v);
214 static void m_stop(struct seq_file *m, void *v)
216 struct proc_maps_private *priv = m->private;
218 if (!IS_ERR_OR_NULL(v))
221 put_task_struct(priv->task);
226 static int proc_maps_open(struct inode *inode, struct file *file,
227 const struct seq_operations *ops, int psize)
229 struct proc_maps_private *priv = __seq_open_private(file, ops, psize);
235 priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
236 if (IS_ERR(priv->mm)) {
237 int err = PTR_ERR(priv->mm);
239 seq_release_private(inode, file);
246 static int proc_map_release(struct inode *inode, struct file *file)
248 struct seq_file *seq = file->private_data;
249 struct proc_maps_private *priv = seq->private;
254 return seq_release_private(inode, file);
257 static int do_maps_open(struct inode *inode, struct file *file,
258 const struct seq_operations *ops)
260 return proc_maps_open(inode, file, ops,
261 sizeof(struct proc_maps_private));
265 * Indicate if the VMA is a stack for the given task; for
266 * /proc/PID/maps that is the stack of the main task.
268 static int is_stack(struct proc_maps_private *priv,
269 struct vm_area_struct *vma, int is_pid)
274 stack = vma->vm_start <= vma->vm_mm->start_stack &&
275 vma->vm_end >= vma->vm_mm->start_stack;
277 struct inode *inode = priv->inode;
278 struct task_struct *task;
281 task = pid_task(proc_pid(inode), PIDTYPE_PID);
283 stack = vma_is_stack_for_task(vma, task);
290 show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
292 struct mm_struct *mm = vma->vm_mm;
293 struct file *file = vma->vm_file;
294 struct proc_maps_private *priv = m->private;
295 vm_flags_t flags = vma->vm_flags;
296 unsigned long ino = 0;
297 unsigned long long pgoff = 0;
298 unsigned long start, end;
300 const char *name = NULL;
303 struct inode *inode = file_inode(vma->vm_file);
304 dev = inode->i_sb->s_dev;
306 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
309 /* We don't show the stack guard page in /proc/maps */
310 start = vma->vm_start;
311 if (stack_guard_page_start(vma, start))
314 if (stack_guard_page_end(vma, end))
317 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
318 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
321 flags & VM_READ ? 'r' : '-',
322 flags & VM_WRITE ? 'w' : '-',
323 flags & VM_EXEC ? 'x' : '-',
324 flags & VM_MAYSHARE ? 's' : 'p',
326 MAJOR(dev), MINOR(dev), ino);
329 * Print the dentry name for named mappings, and a
330 * special [heap] marker for the heap:
334 seq_file_path(m, file, "\n");
338 if (vma->vm_ops && vma->vm_ops->name) {
339 name = vma->vm_ops->name(vma);
344 name = arch_vma_name(vma);
351 if (vma->vm_start <= mm->brk &&
352 vma->vm_end >= mm->start_brk) {
357 if (is_stack(priv, vma, is_pid))
369 static int show_map(struct seq_file *m, void *v, int is_pid)
371 show_map_vma(m, v, is_pid);
376 static int show_pid_map(struct seq_file *m, void *v)
378 return show_map(m, v, 1);
381 static int show_tid_map(struct seq_file *m, void *v)
383 return show_map(m, v, 0);
386 static const struct seq_operations proc_pid_maps_op = {
393 static const struct seq_operations proc_tid_maps_op = {
400 static int pid_maps_open(struct inode *inode, struct file *file)
402 return do_maps_open(inode, file, &proc_pid_maps_op);
405 static int tid_maps_open(struct inode *inode, struct file *file)
407 return do_maps_open(inode, file, &proc_tid_maps_op);
410 const struct file_operations proc_pid_maps_operations = {
411 .open = pid_maps_open,
414 .release = proc_map_release,
417 const struct file_operations proc_tid_maps_operations = {
418 .open = tid_maps_open,
421 .release = proc_map_release,
425 * Proportional Set Size(PSS): my share of RSS.
427 * PSS of a process is the count of pages it has in memory, where each
428 * page is divided by the number of processes sharing it. So if a
429 * process has 1000 pages all to itself, and 1000 shared with one other
430 * process, its PSS will be 1500.
432 * To keep (accumulated) division errors low, we adopt a 64bit
433 * fixed-point pss counter to minimize division errors. So (pss >>
434 * PSS_SHIFT) would be the real byte count.
436 * A shift of 12 before division means (assuming 4K page size):
437 * - 1M 3-user-pages add up to 8KB errors;
438 * - supports mapcount up to 2^24, or 16M;
439 * - supports PSS up to 2^52 bytes, or 4PB.
443 #ifdef CONFIG_PROC_PAGE_MONITOR
444 struct mem_size_stats {
445 unsigned long resident;
446 unsigned long shared_clean;
447 unsigned long shared_dirty;
448 unsigned long private_clean;
449 unsigned long private_dirty;
450 unsigned long referenced;
451 unsigned long anonymous;
452 unsigned long anonymous_thp;
453 unsigned long shmem_thp;
455 unsigned long shared_hugetlb;
456 unsigned long private_hugetlb;
459 bool check_shmem_swap;
462 static void smaps_account(struct mem_size_stats *mss, struct page *page,
463 bool compound, bool young, bool dirty)
465 int i, nr = compound ? 1 << compound_order(page) : 1;
466 unsigned long size = nr * PAGE_SIZE;
469 mss->anonymous += size;
471 mss->resident += size;
472 /* Accumulate the size in pages that have been accessed. */
473 if (young || page_is_young(page) || PageReferenced(page))
474 mss->referenced += size;
477 * page_count(page) == 1 guarantees the page is mapped exactly once.
478 * If any subpage of the compound page mapped with PTE it would elevate
481 if (page_count(page) == 1) {
482 if (dirty || PageDirty(page))
483 mss->private_dirty += size;
485 mss->private_clean += size;
486 mss->pss += (u64)size << PSS_SHIFT;
490 for (i = 0; i < nr; i++, page++) {
491 int mapcount = page_mapcount(page);
494 if (dirty || PageDirty(page))
495 mss->shared_dirty += PAGE_SIZE;
497 mss->shared_clean += PAGE_SIZE;
498 mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
500 if (dirty || PageDirty(page))
501 mss->private_dirty += PAGE_SIZE;
503 mss->private_clean += PAGE_SIZE;
504 mss->pss += PAGE_SIZE << PSS_SHIFT;
510 static int smaps_pte_hole(unsigned long addr, unsigned long end,
511 struct mm_walk *walk)
513 struct mem_size_stats *mss = walk->private;
515 mss->swap += shmem_partial_swap_usage(
516 walk->vma->vm_file->f_mapping, addr, end);
522 static void smaps_pte_entry(pte_t *pte, unsigned long addr,
523 struct mm_walk *walk)
525 struct mem_size_stats *mss = walk->private;
526 struct vm_area_struct *vma = walk->vma;
527 struct page *page = NULL;
529 if (pte_present(*pte)) {
530 page = vm_normal_page(vma, addr, *pte);
531 } else if (is_swap_pte(*pte)) {
532 swp_entry_t swpent = pte_to_swp_entry(*pte);
534 if (!non_swap_entry(swpent)) {
537 mss->swap += PAGE_SIZE;
538 mapcount = swp_swapcount(swpent);
540 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
542 do_div(pss_delta, mapcount);
543 mss->swap_pss += pss_delta;
545 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
547 } else if (is_migration_entry(swpent))
548 page = migration_entry_to_page(swpent);
549 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
550 && pte_none(*pte))) {
551 page = find_get_entry(vma->vm_file->f_mapping,
552 linear_page_index(vma, addr));
556 if (radix_tree_exceptional_entry(page))
557 mss->swap += PAGE_SIZE;
567 smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
570 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
571 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
572 struct mm_walk *walk)
574 struct mem_size_stats *mss = walk->private;
575 struct vm_area_struct *vma = walk->vma;
578 /* FOLL_DUMP will return -EFAULT on huge zero page */
579 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
580 if (IS_ERR_OR_NULL(page))
583 mss->anonymous_thp += HPAGE_PMD_SIZE;
584 else if (PageSwapBacked(page))
585 mss->shmem_thp += HPAGE_PMD_SIZE;
586 else if (is_zone_device_page(page))
589 VM_BUG_ON_PAGE(1, page);
590 smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
593 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
594 struct mm_walk *walk)
599 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
600 struct mm_walk *walk)
602 struct vm_area_struct *vma = walk->vma;
606 ptl = pmd_trans_huge_lock(pmd, vma);
608 smaps_pmd_entry(pmd, addr, walk);
613 if (pmd_trans_unstable(pmd))
616 * The mmap_sem held all the way back in m_start() is what
617 * keeps khugepaged out of here and from collapsing things
620 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
621 for (; addr != end; pte++, addr += PAGE_SIZE)
622 smaps_pte_entry(pte, addr, walk);
623 pte_unmap_unlock(pte - 1, ptl);
628 static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
631 * Don't forget to update Documentation/ on changes.
633 static const char mnemonics[BITS_PER_LONG][2] = {
635 * In case if we meet a flag we don't know about.
637 [0 ... (BITS_PER_LONG-1)] = "??",
639 [ilog2(VM_READ)] = "rd",
640 [ilog2(VM_WRITE)] = "wr",
641 [ilog2(VM_EXEC)] = "ex",
642 [ilog2(VM_SHARED)] = "sh",
643 [ilog2(VM_MAYREAD)] = "mr",
644 [ilog2(VM_MAYWRITE)] = "mw",
645 [ilog2(VM_MAYEXEC)] = "me",
646 [ilog2(VM_MAYSHARE)] = "ms",
647 [ilog2(VM_GROWSDOWN)] = "gd",
648 [ilog2(VM_PFNMAP)] = "pf",
649 [ilog2(VM_DENYWRITE)] = "dw",
650 #ifdef CONFIG_X86_INTEL_MPX
651 [ilog2(VM_MPX)] = "mp",
653 [ilog2(VM_LOCKED)] = "lo",
654 [ilog2(VM_IO)] = "io",
655 [ilog2(VM_SEQ_READ)] = "sr",
656 [ilog2(VM_RAND_READ)] = "rr",
657 [ilog2(VM_DONTCOPY)] = "dc",
658 [ilog2(VM_DONTEXPAND)] = "de",
659 [ilog2(VM_ACCOUNT)] = "ac",
660 [ilog2(VM_NORESERVE)] = "nr",
661 [ilog2(VM_HUGETLB)] = "ht",
662 [ilog2(VM_ARCH_1)] = "ar",
663 [ilog2(VM_DONTDUMP)] = "dd",
664 #ifdef CONFIG_MEM_SOFT_DIRTY
665 [ilog2(VM_SOFTDIRTY)] = "sd",
667 [ilog2(VM_MIXEDMAP)] = "mm",
668 [ilog2(VM_HUGEPAGE)] = "hg",
669 [ilog2(VM_NOHUGEPAGE)] = "nh",
670 [ilog2(VM_MERGEABLE)] = "mg",
671 [ilog2(VM_UFFD_MISSING)]= "um",
672 [ilog2(VM_UFFD_WP)] = "uw",
673 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
674 /* These come out via ProtectionKey: */
675 [ilog2(VM_PKEY_BIT0)] = "",
676 [ilog2(VM_PKEY_BIT1)] = "",
677 [ilog2(VM_PKEY_BIT2)] = "",
678 [ilog2(VM_PKEY_BIT3)] = "",
683 seq_puts(m, "VmFlags: ");
684 for (i = 0; i < BITS_PER_LONG; i++) {
685 if (!mnemonics[i][0])
687 if (vma->vm_flags & (1UL << i)) {
688 seq_printf(m, "%c%c ",
689 mnemonics[i][0], mnemonics[i][1]);
695 #ifdef CONFIG_HUGETLB_PAGE
696 static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
697 unsigned long addr, unsigned long end,
698 struct mm_walk *walk)
700 struct mem_size_stats *mss = walk->private;
701 struct vm_area_struct *vma = walk->vma;
702 struct page *page = NULL;
704 if (pte_present(*pte)) {
705 page = vm_normal_page(vma, addr, *pte);
706 } else if (is_swap_pte(*pte)) {
707 swp_entry_t swpent = pte_to_swp_entry(*pte);
709 if (is_migration_entry(swpent))
710 page = migration_entry_to_page(swpent);
713 int mapcount = page_mapcount(page);
716 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
718 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
722 #endif /* HUGETLB_PAGE */
724 void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma)
728 static int show_smap(struct seq_file *m, void *v, int is_pid)
730 struct vm_area_struct *vma = v;
731 struct mem_size_stats mss;
732 struct mm_walk smaps_walk = {
733 .pmd_entry = smaps_pte_range,
734 #ifdef CONFIG_HUGETLB_PAGE
735 .hugetlb_entry = smaps_hugetlb_range,
741 memset(&mss, 0, sizeof mss);
744 if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) {
746 * For shared or readonly shmem mappings we know that all
747 * swapped out pages belong to the shmem object, and we can
748 * obtain the swap value much more efficiently. For private
749 * writable mappings, we might have COW pages that are
750 * not affected by the parent swapped out pages of the shmem
751 * object, so we have to distinguish them during the page walk.
752 * Unless we know that the shmem object (or the part mapped by
753 * our VMA) has no swapped out pages at all.
755 unsigned long shmem_swapped = shmem_swap_usage(vma);
757 if (!shmem_swapped || (vma->vm_flags & VM_SHARED) ||
758 !(vma->vm_flags & VM_WRITE)) {
759 mss.swap = shmem_swapped;
761 mss.check_shmem_swap = true;
762 smaps_walk.pte_hole = smaps_pte_hole;
767 /* mmap_sem is held in m_start */
768 walk_page_vma(vma, &smaps_walk);
770 show_map_vma(m, vma, is_pid);
776 "Shared_Clean: %8lu kB\n"
777 "Shared_Dirty: %8lu kB\n"
778 "Private_Clean: %8lu kB\n"
779 "Private_Dirty: %8lu kB\n"
780 "Referenced: %8lu kB\n"
781 "Anonymous: %8lu kB\n"
782 "AnonHugePages: %8lu kB\n"
783 "ShmemPmdMapped: %8lu kB\n"
784 "Shared_Hugetlb: %8lu kB\n"
785 "Private_Hugetlb: %7lu kB\n"
788 "KernelPageSize: %8lu kB\n"
789 "MMUPageSize: %8lu kB\n"
791 (vma->vm_end - vma->vm_start) >> 10,
793 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
794 mss.shared_clean >> 10,
795 mss.shared_dirty >> 10,
796 mss.private_clean >> 10,
797 mss.private_dirty >> 10,
798 mss.referenced >> 10,
800 mss.anonymous_thp >> 10,
802 mss.shared_hugetlb >> 10,
803 mss.private_hugetlb >> 10,
805 (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
806 vma_kernel_pagesize(vma) >> 10,
807 vma_mmu_pagesize(vma) >> 10,
808 (vma->vm_flags & VM_LOCKED) ?
809 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
811 arch_show_smap(m, vma);
812 show_smap_vma_flags(m, vma);
817 static int show_pid_smap(struct seq_file *m, void *v)
819 return show_smap(m, v, 1);
822 static int show_tid_smap(struct seq_file *m, void *v)
824 return show_smap(m, v, 0);
827 static const struct seq_operations proc_pid_smaps_op = {
831 .show = show_pid_smap
834 static const struct seq_operations proc_tid_smaps_op = {
838 .show = show_tid_smap
841 static int pid_smaps_open(struct inode *inode, struct file *file)
843 return do_maps_open(inode, file, &proc_pid_smaps_op);
846 static int tid_smaps_open(struct inode *inode, struct file *file)
848 return do_maps_open(inode, file, &proc_tid_smaps_op);
851 const struct file_operations proc_pid_smaps_operations = {
852 .open = pid_smaps_open,
855 .release = proc_map_release,
858 const struct file_operations proc_tid_smaps_operations = {
859 .open = tid_smaps_open,
862 .release = proc_map_release,
865 enum clear_refs_types {
869 CLEAR_REFS_SOFT_DIRTY,
870 CLEAR_REFS_MM_HIWATER_RSS,
874 struct clear_refs_private {
875 enum clear_refs_types type;
878 #ifdef CONFIG_MEM_SOFT_DIRTY
879 static inline void clear_soft_dirty(struct vm_area_struct *vma,
880 unsigned long addr, pte_t *pte)
883 * The soft-dirty tracker uses #PF-s to catch writes
884 * to pages, so write-protect the pte as well. See the
885 * Documentation/vm/soft-dirty.txt for full description
886 * of how soft-dirty works.
890 if (pte_present(ptent)) {
891 ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
892 ptent = pte_wrprotect(ptent);
893 ptent = pte_clear_soft_dirty(ptent);
894 ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
895 } else if (is_swap_pte(ptent)) {
896 ptent = pte_swp_clear_soft_dirty(ptent);
897 set_pte_at(vma->vm_mm, addr, pte, ptent);
901 static inline void clear_soft_dirty(struct vm_area_struct *vma,
902 unsigned long addr, pte_t *pte)
907 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
908 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
909 unsigned long addr, pmd_t *pmdp)
911 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
913 pmd = pmd_wrprotect(pmd);
914 pmd = pmd_clear_soft_dirty(pmd);
916 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
919 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
920 unsigned long addr, pmd_t *pmdp)
925 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
926 unsigned long end, struct mm_walk *walk)
928 struct clear_refs_private *cp = walk->private;
929 struct vm_area_struct *vma = walk->vma;
934 ptl = pmd_trans_huge_lock(pmd, vma);
936 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
937 clear_soft_dirty_pmd(vma, addr, pmd);
941 page = pmd_page(*pmd);
943 /* Clear accessed and referenced bits. */
944 pmdp_test_and_clear_young(vma, addr, pmd);
945 test_and_clear_page_young(page);
946 ClearPageReferenced(page);
952 if (pmd_trans_unstable(pmd))
955 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
956 for (; addr != end; pte++, addr += PAGE_SIZE) {
959 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
960 clear_soft_dirty(vma, addr, pte);
964 if (!pte_present(ptent))
967 page = vm_normal_page(vma, addr, ptent);
971 /* Clear accessed and referenced bits. */
972 ptep_test_and_clear_young(vma, addr, pte);
973 test_and_clear_page_young(page);
974 ClearPageReferenced(page);
976 pte_unmap_unlock(pte - 1, ptl);
981 static int clear_refs_test_walk(unsigned long start, unsigned long end,
982 struct mm_walk *walk)
984 struct clear_refs_private *cp = walk->private;
985 struct vm_area_struct *vma = walk->vma;
987 if (vma->vm_flags & VM_PFNMAP)
991 * Writing 1 to /proc/pid/clear_refs affects all pages.
992 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
993 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
994 * Writing 4 to /proc/pid/clear_refs affects all pages.
996 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
998 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
1003 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
1004 size_t count, loff_t *ppos)
1006 struct task_struct *task;
1007 char buffer[PROC_NUMBUF];
1008 struct mm_struct *mm;
1009 struct vm_area_struct *vma;
1010 enum clear_refs_types type;
1014 memset(buffer, 0, sizeof(buffer));
1015 if (count > sizeof(buffer) - 1)
1016 count = sizeof(buffer) - 1;
1017 if (copy_from_user(buffer, buf, count))
1019 rv = kstrtoint(strstrip(buffer), 10, &itype);
1022 type = (enum clear_refs_types)itype;
1023 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
1026 task = get_proc_task(file_inode(file));
1029 mm = get_task_mm(task);
1031 struct clear_refs_private cp = {
1034 struct mm_walk clear_refs_walk = {
1035 .pmd_entry = clear_refs_pte_range,
1036 .test_walk = clear_refs_test_walk,
1041 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1042 if (down_write_killable(&mm->mmap_sem)) {
1048 * Writing 5 to /proc/pid/clear_refs resets the peak
1049 * resident set size to this mm's current rss value.
1051 reset_mm_hiwater_rss(mm);
1052 up_write(&mm->mmap_sem);
1056 down_read(&mm->mmap_sem);
1057 if (type == CLEAR_REFS_SOFT_DIRTY) {
1058 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1059 if (!(vma->vm_flags & VM_SOFTDIRTY))
1061 up_read(&mm->mmap_sem);
1062 if (down_write_killable(&mm->mmap_sem)) {
1066 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1067 vma->vm_flags &= ~VM_SOFTDIRTY;
1068 vma_set_page_prot(vma);
1070 downgrade_write(&mm->mmap_sem);
1073 mmu_notifier_invalidate_range_start(mm, 0, -1);
1075 walk_page_range(0, mm->highest_vm_end, &clear_refs_walk);
1076 if (type == CLEAR_REFS_SOFT_DIRTY)
1077 mmu_notifier_invalidate_range_end(mm, 0, -1);
1079 up_read(&mm->mmap_sem);
1083 put_task_struct(task);
1088 const struct file_operations proc_clear_refs_operations = {
1089 .write = clear_refs_write,
1090 .llseek = noop_llseek,
1097 struct pagemapread {
1098 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1099 pagemap_entry_t *buffer;
1103 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1104 #define PAGEMAP_WALK_MASK (PMD_MASK)
1106 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1107 #define PM_PFRAME_BITS 55
1108 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1109 #define PM_SOFT_DIRTY BIT_ULL(55)
1110 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1111 #define PM_FILE BIT_ULL(61)
1112 #define PM_SWAP BIT_ULL(62)
1113 #define PM_PRESENT BIT_ULL(63)
1115 #define PM_END_OF_BUFFER 1
1117 static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1119 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1122 static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1123 struct pagemapread *pm)
1125 pm->buffer[pm->pos++] = *pme;
1126 if (pm->pos >= pm->len)
1127 return PM_END_OF_BUFFER;
1131 static int pagemap_pte_hole(unsigned long start, unsigned long end,
1132 struct mm_walk *walk)
1134 struct pagemapread *pm = walk->private;
1135 unsigned long addr = start;
1138 while (addr < end) {
1139 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1140 pagemap_entry_t pme = make_pme(0, 0);
1141 /* End of address space hole, which we mark as non-present. */
1142 unsigned long hole_end;
1145 hole_end = min(end, vma->vm_start);
1149 for (; addr < hole_end; addr += PAGE_SIZE) {
1150 err = add_to_pagemap(addr, &pme, pm);
1158 /* Addresses in the VMA. */
1159 if (vma->vm_flags & VM_SOFTDIRTY)
1160 pme = make_pme(0, PM_SOFT_DIRTY);
1161 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1162 err = add_to_pagemap(addr, &pme, pm);
1171 static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1172 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1174 u64 frame = 0, flags = 0;
1175 struct page *page = NULL;
1177 if (pte_present(pte)) {
1179 frame = pte_pfn(pte);
1180 flags |= PM_PRESENT;
1181 page = vm_normal_page(vma, addr, pte);
1182 if (pte_soft_dirty(pte))
1183 flags |= PM_SOFT_DIRTY;
1184 } else if (is_swap_pte(pte)) {
1186 if (pte_swp_soft_dirty(pte))
1187 flags |= PM_SOFT_DIRTY;
1188 entry = pte_to_swp_entry(pte);
1189 frame = swp_type(entry) |
1190 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1192 if (is_migration_entry(entry))
1193 page = migration_entry_to_page(entry);
1196 if (page && !PageAnon(page))
1198 if (page && page_mapcount(page) == 1)
1199 flags |= PM_MMAP_EXCLUSIVE;
1200 if (vma->vm_flags & VM_SOFTDIRTY)
1201 flags |= PM_SOFT_DIRTY;
1203 return make_pme(frame, flags);
1206 static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1207 struct mm_walk *walk)
1209 struct vm_area_struct *vma = walk->vma;
1210 struct pagemapread *pm = walk->private;
1212 pte_t *pte, *orig_pte;
1215 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1216 ptl = pmd_trans_huge_lock(pmdp, vma);
1218 u64 flags = 0, frame = 0;
1221 if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
1222 flags |= PM_SOFT_DIRTY;
1225 * Currently pmd for thp is always present because thp
1226 * can not be swapped-out, migrated, or HWPOISONed
1227 * (split in such cases instead.)
1228 * This if-check is just to prepare for future implementation.
1230 if (pmd_present(pmd)) {
1231 struct page *page = pmd_page(pmd);
1233 if (page_mapcount(page) == 1)
1234 flags |= PM_MMAP_EXCLUSIVE;
1236 flags |= PM_PRESENT;
1238 frame = pmd_pfn(pmd) +
1239 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1242 for (; addr != end; addr += PAGE_SIZE) {
1243 pagemap_entry_t pme = make_pme(frame, flags);
1245 err = add_to_pagemap(addr, &pme, pm);
1248 if (pm->show_pfn && (flags & PM_PRESENT))
1255 if (pmd_trans_unstable(pmdp))
1257 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1260 * We can assume that @vma always points to a valid one and @end never
1261 * goes beyond vma->vm_end.
1263 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1264 for (; addr < end; pte++, addr += PAGE_SIZE) {
1265 pagemap_entry_t pme;
1267 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1268 err = add_to_pagemap(addr, &pme, pm);
1272 pte_unmap_unlock(orig_pte, ptl);
1279 #ifdef CONFIG_HUGETLB_PAGE
1280 /* This function walks within one hugetlb entry in the single call */
1281 static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1282 unsigned long addr, unsigned long end,
1283 struct mm_walk *walk)
1285 struct pagemapread *pm = walk->private;
1286 struct vm_area_struct *vma = walk->vma;
1287 u64 flags = 0, frame = 0;
1291 if (vma->vm_flags & VM_SOFTDIRTY)
1292 flags |= PM_SOFT_DIRTY;
1294 pte = huge_ptep_get(ptep);
1295 if (pte_present(pte)) {
1296 struct page *page = pte_page(pte);
1298 if (!PageAnon(page))
1301 if (page_mapcount(page) == 1)
1302 flags |= PM_MMAP_EXCLUSIVE;
1304 flags |= PM_PRESENT;
1306 frame = pte_pfn(pte) +
1307 ((addr & ~hmask) >> PAGE_SHIFT);
1310 for (; addr != end; addr += PAGE_SIZE) {
1311 pagemap_entry_t pme = make_pme(frame, flags);
1313 err = add_to_pagemap(addr, &pme, pm);
1316 if (pm->show_pfn && (flags & PM_PRESENT))
1324 #endif /* HUGETLB_PAGE */
1327 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1329 * For each page in the address space, this file contains one 64-bit entry
1330 * consisting of the following:
1332 * Bits 0-54 page frame number (PFN) if present
1333 * Bits 0-4 swap type if swapped
1334 * Bits 5-54 swap offset if swapped
1335 * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt)
1336 * Bit 56 page exclusively mapped
1338 * Bit 61 page is file-page or shared-anon
1339 * Bit 62 page swapped
1340 * Bit 63 page present
1342 * If the page is not present but in swap, then the PFN contains an
1343 * encoding of the swap file number and the page's offset into the
1344 * swap. Unmapped pages return a null PFN. This allows determining
1345 * precisely which pages are mapped (or in swap) and comparing mapped
1346 * pages between processes.
1348 * Efficient users of this interface will use /proc/pid/maps to
1349 * determine which areas of memory are actually mapped and llseek to
1350 * skip over unmapped regions.
1352 static ssize_t pagemap_read(struct file *file, char __user *buf,
1353 size_t count, loff_t *ppos)
1355 struct mm_struct *mm = file->private_data;
1356 struct pagemapread pm;
1357 struct mm_walk pagemap_walk = {};
1359 unsigned long svpfn;
1360 unsigned long start_vaddr;
1361 unsigned long end_vaddr;
1362 int ret = 0, copied = 0;
1364 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
1368 /* file position must be aligned */
1369 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1376 /* do not disclose physical addresses: attack vector */
1377 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1379 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1380 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
1385 pagemap_walk.pmd_entry = pagemap_pmd_range;
1386 pagemap_walk.pte_hole = pagemap_pte_hole;
1387 #ifdef CONFIG_HUGETLB_PAGE
1388 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1390 pagemap_walk.mm = mm;
1391 pagemap_walk.private = ±
1394 svpfn = src / PM_ENTRY_BYTES;
1395 start_vaddr = svpfn << PAGE_SHIFT;
1396 end_vaddr = mm->task_size;
1398 /* watch out for wraparound */
1399 if (svpfn > mm->task_size >> PAGE_SHIFT)
1400 start_vaddr = end_vaddr;
1403 * The odds are that this will stop walking way
1404 * before end_vaddr, because the length of the
1405 * user buffer is tracked in "pm", and the walk
1406 * will stop when we hit the end of the buffer.
1409 while (count && (start_vaddr < end_vaddr)) {
1414 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1416 if (end < start_vaddr || end > end_vaddr)
1418 down_read(&mm->mmap_sem);
1419 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1420 up_read(&mm->mmap_sem);
1423 len = min(count, PM_ENTRY_BYTES * pm.pos);
1424 if (copy_to_user(buf, pm.buffer, len)) {
1433 if (!ret || ret == PM_END_OF_BUFFER)
1444 static int pagemap_open(struct inode *inode, struct file *file)
1446 struct mm_struct *mm;
1448 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1451 file->private_data = mm;
1455 static int pagemap_release(struct inode *inode, struct file *file)
1457 struct mm_struct *mm = file->private_data;
1464 const struct file_operations proc_pagemap_operations = {
1465 .llseek = mem_lseek, /* borrow this */
1466 .read = pagemap_read,
1467 .open = pagemap_open,
1468 .release = pagemap_release,
1470 #endif /* CONFIG_PROC_PAGE_MONITOR */
1475 unsigned long pages;
1477 unsigned long active;
1478 unsigned long writeback;
1479 unsigned long mapcount_max;
1480 unsigned long dirty;
1481 unsigned long swapcache;
1482 unsigned long node[MAX_NUMNODES];
1485 struct numa_maps_private {
1486 struct proc_maps_private proc_maps;
1487 struct numa_maps md;
1490 static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1491 unsigned long nr_pages)
1493 int count = page_mapcount(page);
1495 md->pages += nr_pages;
1496 if (pte_dirty || PageDirty(page))
1497 md->dirty += nr_pages;
1499 if (PageSwapCache(page))
1500 md->swapcache += nr_pages;
1502 if (PageActive(page) || PageUnevictable(page))
1503 md->active += nr_pages;
1505 if (PageWriteback(page))
1506 md->writeback += nr_pages;
1509 md->anon += nr_pages;
1511 if (count > md->mapcount_max)
1512 md->mapcount_max = count;
1514 md->node[page_to_nid(page)] += nr_pages;
1517 static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1523 if (!pte_present(pte))
1526 page = vm_normal_page(vma, addr, pte);
1530 if (PageReserved(page))
1533 nid = page_to_nid(page);
1534 if (!node_isset(nid, node_states[N_MEMORY]))
1540 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1541 static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1542 struct vm_area_struct *vma,
1548 if (!pmd_present(pmd))
1551 page = vm_normal_page_pmd(vma, addr, pmd);
1555 if (PageReserved(page))
1558 nid = page_to_nid(page);
1559 if (!node_isset(nid, node_states[N_MEMORY]))
1566 static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1567 unsigned long end, struct mm_walk *walk)
1569 struct numa_maps *md = walk->private;
1570 struct vm_area_struct *vma = walk->vma;
1575 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1576 ptl = pmd_trans_huge_lock(pmd, vma);
1580 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1582 gather_stats(page, md, pmd_dirty(*pmd),
1583 HPAGE_PMD_SIZE/PAGE_SIZE);
1588 if (pmd_trans_unstable(pmd))
1591 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1593 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1596 gather_stats(page, md, pte_dirty(*pte), 1);
1598 } while (pte++, addr += PAGE_SIZE, addr != end);
1599 pte_unmap_unlock(orig_pte, ptl);
1602 #ifdef CONFIG_HUGETLB_PAGE
1603 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1604 unsigned long addr, unsigned long end, struct mm_walk *walk)
1606 pte_t huge_pte = huge_ptep_get(pte);
1607 struct numa_maps *md;
1610 if (!pte_present(huge_pte))
1613 page = pte_page(huge_pte);
1618 gather_stats(page, md, pte_dirty(huge_pte), 1);
1623 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1624 unsigned long addr, unsigned long end, struct mm_walk *walk)
1631 * Display pages allocated per node and memory policy via /proc.
1633 static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1635 struct numa_maps_private *numa_priv = m->private;
1636 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1637 struct vm_area_struct *vma = v;
1638 struct numa_maps *md = &numa_priv->md;
1639 struct file *file = vma->vm_file;
1640 struct mm_struct *mm = vma->vm_mm;
1641 struct mm_walk walk = {
1642 .hugetlb_entry = gather_hugetlb_stats,
1643 .pmd_entry = gather_pte_stats,
1647 struct mempolicy *pol;
1654 /* Ensure we start with an empty set of numa_maps statistics. */
1655 memset(md, 0, sizeof(*md));
1657 pol = __get_vma_policy(vma, vma->vm_start);
1659 mpol_to_str(buffer, sizeof(buffer), pol);
1662 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1665 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1668 seq_puts(m, " file=");
1669 seq_file_path(m, file, "\n\t= ");
1670 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1671 seq_puts(m, " heap");
1672 } else if (is_stack(proc_priv, vma, is_pid)) {
1673 seq_puts(m, " stack");
1676 if (is_vm_hugetlb_page(vma))
1677 seq_puts(m, " huge");
1679 /* mmap_sem is held by m_start */
1680 walk_page_vma(vma, &walk);
1686 seq_printf(m, " anon=%lu", md->anon);
1689 seq_printf(m, " dirty=%lu", md->dirty);
1691 if (md->pages != md->anon && md->pages != md->dirty)
1692 seq_printf(m, " mapped=%lu", md->pages);
1694 if (md->mapcount_max > 1)
1695 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1698 seq_printf(m, " swapcache=%lu", md->swapcache);
1700 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1701 seq_printf(m, " active=%lu", md->active);
1704 seq_printf(m, " writeback=%lu", md->writeback);
1706 for_each_node_state(nid, N_MEMORY)
1708 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1710 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1713 m_cache_vma(m, vma);
1717 static int show_pid_numa_map(struct seq_file *m, void *v)
1719 return show_numa_map(m, v, 1);
1722 static int show_tid_numa_map(struct seq_file *m, void *v)
1724 return show_numa_map(m, v, 0);
1727 static const struct seq_operations proc_pid_numa_maps_op = {
1731 .show = show_pid_numa_map,
1734 static const struct seq_operations proc_tid_numa_maps_op = {
1738 .show = show_tid_numa_map,
1741 static int numa_maps_open(struct inode *inode, struct file *file,
1742 const struct seq_operations *ops)
1744 return proc_maps_open(inode, file, ops,
1745 sizeof(struct numa_maps_private));
1748 static int pid_numa_maps_open(struct inode *inode, struct file *file)
1750 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1753 static int tid_numa_maps_open(struct inode *inode, struct file *file)
1755 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1758 const struct file_operations proc_pid_numa_maps_operations = {
1759 .open = pid_numa_maps_open,
1761 .llseek = seq_lseek,
1762 .release = proc_map_release,
1765 const struct file_operations proc_tid_numa_maps_operations = {
1766 .open = tid_numa_maps_open,
1768 .llseek = seq_lseek,
1769 .release = proc_map_release,
1771 #endif /* CONFIG_NUMA */