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));
301 static pid_t pid_of_stack(struct proc_maps_private *priv,
302 struct vm_area_struct *vma, bool is_pid)
304 struct inode *inode = priv->inode;
305 struct task_struct *task;
309 task = pid_task(proc_pid(inode), PIDTYPE_PID);
311 task = task_of_stack(task, vma, is_pid);
313 ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info);
321 show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
323 struct mm_struct *mm = vma->vm_mm;
324 struct file *file = vma->vm_file;
325 struct proc_maps_private *priv = m->private;
326 vm_flags_t flags = vma->vm_flags;
327 unsigned long ino = 0;
328 unsigned long long pgoff = 0;
329 unsigned long start, end;
331 const char *name = NULL;
334 struct inode *inode = file_inode(vma->vm_file);
335 dev = inode->i_sb->s_dev;
337 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
340 /* We don't show the stack guard page in /proc/maps */
341 start = vma->vm_start;
342 if (stack_guard_page_start(vma, start))
345 if (stack_guard_page_end(vma, end))
348 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
349 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
352 flags & VM_READ ? 'r' : '-',
353 flags & VM_WRITE ? 'w' : '-',
354 flags & VM_EXEC ? 'x' : '-',
355 flags & VM_MAYSHARE ? 's' : 'p',
357 MAJOR(dev), MINOR(dev), ino);
360 * Print the dentry name for named mappings, and a
361 * special [heap] marker for the heap:
365 seq_file_path(m, file, "\n");
369 if (vma->vm_ops && vma->vm_ops->name) {
370 name = vma->vm_ops->name(vma);
375 name = arch_vma_name(vma);
384 if (vma->vm_start <= mm->brk &&
385 vma->vm_end >= mm->start_brk) {
390 tid = pid_of_stack(priv, vma, is_pid);
393 * Thread stack in /proc/PID/task/TID/maps or
394 * the main process stack.
396 if (!is_pid || (vma->vm_start <= mm->start_stack &&
397 vma->vm_end >= mm->start_stack)) {
400 /* Thread stack in /proc/PID/maps */
402 seq_printf(m, "[stack:%d]", tid);
407 if (vma_get_anon_name(vma)) {
409 seq_print_vma_name(m, vma);
421 static int show_map(struct seq_file *m, void *v, int is_pid)
423 show_map_vma(m, v, is_pid);
428 static int show_pid_map(struct seq_file *m, void *v)
430 return show_map(m, v, 1);
433 static int show_tid_map(struct seq_file *m, void *v)
435 return show_map(m, v, 0);
438 static const struct seq_operations proc_pid_maps_op = {
445 static const struct seq_operations proc_tid_maps_op = {
452 static int pid_maps_open(struct inode *inode, struct file *file)
454 return do_maps_open(inode, file, &proc_pid_maps_op);
457 static int tid_maps_open(struct inode *inode, struct file *file)
459 return do_maps_open(inode, file, &proc_tid_maps_op);
462 const struct file_operations proc_pid_maps_operations = {
463 .open = pid_maps_open,
466 .release = proc_map_release,
469 const struct file_operations proc_tid_maps_operations = {
470 .open = tid_maps_open,
473 .release = proc_map_release,
477 * Proportional Set Size(PSS): my share of RSS.
479 * PSS of a process is the count of pages it has in memory, where each
480 * page is divided by the number of processes sharing it. So if a
481 * process has 1000 pages all to itself, and 1000 shared with one other
482 * process, its PSS will be 1500.
484 * To keep (accumulated) division errors low, we adopt a 64bit
485 * fixed-point pss counter to minimize division errors. So (pss >>
486 * PSS_SHIFT) would be the real byte count.
488 * A shift of 12 before division means (assuming 4K page size):
489 * - 1M 3-user-pages add up to 8KB errors;
490 * - supports mapcount up to 2^24, or 16M;
491 * - supports PSS up to 2^52 bytes, or 4PB.
495 #ifdef CONFIG_PROC_PAGE_MONITOR
496 struct mem_size_stats {
497 unsigned long resident;
498 unsigned long shared_clean;
499 unsigned long shared_dirty;
500 unsigned long private_clean;
501 unsigned long private_dirty;
502 unsigned long referenced;
503 unsigned long anonymous;
504 unsigned long anonymous_thp;
506 unsigned long shared_hugetlb;
507 unsigned long private_hugetlb;
512 static void smaps_account(struct mem_size_stats *mss, struct page *page,
513 unsigned long size, bool young, bool dirty)
518 mss->anonymous += size;
520 mss->resident += size;
521 /* Accumulate the size in pages that have been accessed. */
522 if (young || page_is_young(page) || PageReferenced(page))
523 mss->referenced += size;
524 mapcount = page_mapcount(page);
528 if (dirty || PageDirty(page))
529 mss->shared_dirty += size;
531 mss->shared_clean += size;
532 pss_delta = (u64)size << PSS_SHIFT;
533 do_div(pss_delta, mapcount);
534 mss->pss += pss_delta;
536 if (dirty || PageDirty(page))
537 mss->private_dirty += size;
539 mss->private_clean += size;
540 mss->pss += (u64)size << PSS_SHIFT;
544 static void smaps_pte_entry(pte_t *pte, unsigned long addr,
545 struct mm_walk *walk)
547 struct mem_size_stats *mss = walk->private;
548 struct vm_area_struct *vma = walk->vma;
549 struct page *page = NULL;
551 if (pte_present(*pte)) {
552 page = vm_normal_page(vma, addr, *pte);
553 } else if (is_swap_pte(*pte)) {
554 swp_entry_t swpent = pte_to_swp_entry(*pte);
556 if (!non_swap_entry(swpent)) {
559 mss->swap += PAGE_SIZE;
560 mapcount = swp_swapcount(swpent);
562 u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;
564 do_div(pss_delta, mapcount);
565 mss->swap_pss += pss_delta;
567 mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
569 } else if (is_migration_entry(swpent))
570 page = migration_entry_to_page(swpent);
575 smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte));
578 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
579 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
580 struct mm_walk *walk)
582 struct mem_size_stats *mss = walk->private;
583 struct vm_area_struct *vma = walk->vma;
586 /* FOLL_DUMP will return -EFAULT on huge zero page */
587 page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
588 if (IS_ERR_OR_NULL(page))
590 mss->anonymous_thp += HPAGE_PMD_SIZE;
591 smaps_account(mss, page, HPAGE_PMD_SIZE,
592 pmd_young(*pmd), pmd_dirty(*pmd));
595 static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
596 struct mm_walk *walk)
601 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
602 struct mm_walk *walk)
604 struct vm_area_struct *vma = walk->vma;
608 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
609 smaps_pmd_entry(pmd, addr, walk);
614 if (pmd_trans_unstable(pmd))
617 * The mmap_sem held all the way back in m_start() is what
618 * keeps khugepaged out of here and from collapsing things
621 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
622 for (; addr != end; pte++, addr += PAGE_SIZE)
623 smaps_pte_entry(pte, addr, walk);
624 pte_unmap_unlock(pte - 1, ptl);
629 static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
632 * Don't forget to update Documentation/ on changes.
634 static const char mnemonics[BITS_PER_LONG][2] = {
636 * In case if we meet a flag we don't know about.
638 [0 ... (BITS_PER_LONG-1)] = "??",
640 [ilog2(VM_READ)] = "rd",
641 [ilog2(VM_WRITE)] = "wr",
642 [ilog2(VM_EXEC)] = "ex",
643 [ilog2(VM_SHARED)] = "sh",
644 [ilog2(VM_MAYREAD)] = "mr",
645 [ilog2(VM_MAYWRITE)] = "mw",
646 [ilog2(VM_MAYEXEC)] = "me",
647 [ilog2(VM_MAYSHARE)] = "ms",
648 [ilog2(VM_GROWSDOWN)] = "gd",
649 [ilog2(VM_PFNMAP)] = "pf",
650 [ilog2(VM_DENYWRITE)] = "dw",
651 #ifdef CONFIG_X86_INTEL_MPX
652 [ilog2(VM_MPX)] = "mp",
654 [ilog2(VM_LOCKED)] = "lo",
655 [ilog2(VM_IO)] = "io",
656 [ilog2(VM_SEQ_READ)] = "sr",
657 [ilog2(VM_RAND_READ)] = "rr",
658 [ilog2(VM_DONTCOPY)] = "dc",
659 [ilog2(VM_DONTEXPAND)] = "de",
660 [ilog2(VM_ACCOUNT)] = "ac",
661 [ilog2(VM_NORESERVE)] = "nr",
662 [ilog2(VM_HUGETLB)] = "ht",
663 [ilog2(VM_ARCH_1)] = "ar",
664 [ilog2(VM_DONTDUMP)] = "dd",
665 #ifdef CONFIG_MEM_SOFT_DIRTY
666 [ilog2(VM_SOFTDIRTY)] = "sd",
668 [ilog2(VM_MIXEDMAP)] = "mm",
669 [ilog2(VM_HUGEPAGE)] = "hg",
670 [ilog2(VM_NOHUGEPAGE)] = "nh",
671 [ilog2(VM_MERGEABLE)] = "mg",
672 [ilog2(VM_UFFD_MISSING)]= "um",
673 [ilog2(VM_UFFD_WP)] = "uw",
677 seq_puts(m, "VmFlags: ");
678 for (i = 0; i < BITS_PER_LONG; i++) {
679 if (vma->vm_flags & (1UL << i)) {
680 seq_printf(m, "%c%c ",
681 mnemonics[i][0], mnemonics[i][1]);
687 #ifdef CONFIG_HUGETLB_PAGE
688 static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask,
689 unsigned long addr, unsigned long end,
690 struct mm_walk *walk)
692 struct mem_size_stats *mss = walk->private;
693 struct vm_area_struct *vma = walk->vma;
694 struct page *page = NULL;
696 if (pte_present(*pte)) {
697 page = vm_normal_page(vma, addr, *pte);
698 } else if (is_swap_pte(*pte)) {
699 swp_entry_t swpent = pte_to_swp_entry(*pte);
701 if (is_migration_entry(swpent))
702 page = migration_entry_to_page(swpent);
705 int mapcount = page_mapcount(page);
708 mss->shared_hugetlb += huge_page_size(hstate_vma(vma));
710 mss->private_hugetlb += huge_page_size(hstate_vma(vma));
714 #endif /* HUGETLB_PAGE */
716 static int show_smap(struct seq_file *m, void *v, int is_pid)
718 struct vm_area_struct *vma = v;
719 struct mem_size_stats mss;
720 struct mm_walk smaps_walk = {
721 .pmd_entry = smaps_pte_range,
722 #ifdef CONFIG_HUGETLB_PAGE
723 .hugetlb_entry = smaps_hugetlb_range,
729 memset(&mss, 0, sizeof mss);
730 /* mmap_sem is held in m_start */
731 walk_page_vma(vma, &smaps_walk);
733 show_map_vma(m, vma, is_pid);
735 if (vma_get_anon_name(vma)) {
736 seq_puts(m, "Name: ");
737 seq_print_vma_name(m, vma);
745 "Shared_Clean: %8lu kB\n"
746 "Shared_Dirty: %8lu kB\n"
747 "Private_Clean: %8lu kB\n"
748 "Private_Dirty: %8lu kB\n"
749 "Referenced: %8lu kB\n"
750 "Anonymous: %8lu kB\n"
751 "AnonHugePages: %8lu kB\n"
752 "Shared_Hugetlb: %8lu kB\n"
753 "Private_Hugetlb: %7lu kB\n"
756 "KernelPageSize: %8lu kB\n"
757 "MMUPageSize: %8lu kB\n"
759 (vma->vm_end - vma->vm_start) >> 10,
761 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
762 mss.shared_clean >> 10,
763 mss.shared_dirty >> 10,
764 mss.private_clean >> 10,
765 mss.private_dirty >> 10,
766 mss.referenced >> 10,
768 mss.anonymous_thp >> 10,
769 mss.shared_hugetlb >> 10,
770 mss.private_hugetlb >> 10,
772 (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)),
773 vma_kernel_pagesize(vma) >> 10,
774 vma_mmu_pagesize(vma) >> 10,
775 (vma->vm_flags & VM_LOCKED) ?
776 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
778 show_smap_vma_flags(m, vma);
783 static int show_pid_smap(struct seq_file *m, void *v)
785 return show_smap(m, v, 1);
788 static int show_tid_smap(struct seq_file *m, void *v)
790 return show_smap(m, v, 0);
793 static const struct seq_operations proc_pid_smaps_op = {
797 .show = show_pid_smap
800 static const struct seq_operations proc_tid_smaps_op = {
804 .show = show_tid_smap
807 static int pid_smaps_open(struct inode *inode, struct file *file)
809 return do_maps_open(inode, file, &proc_pid_smaps_op);
812 static int tid_smaps_open(struct inode *inode, struct file *file)
814 return do_maps_open(inode, file, &proc_tid_smaps_op);
817 const struct file_operations proc_pid_smaps_operations = {
818 .open = pid_smaps_open,
821 .release = proc_map_release,
824 const struct file_operations proc_tid_smaps_operations = {
825 .open = tid_smaps_open,
828 .release = proc_map_release,
831 enum clear_refs_types {
835 CLEAR_REFS_SOFT_DIRTY,
836 CLEAR_REFS_MM_HIWATER_RSS,
840 struct clear_refs_private {
841 enum clear_refs_types type;
844 #ifdef CONFIG_MEM_SOFT_DIRTY
845 static inline void clear_soft_dirty(struct vm_area_struct *vma,
846 unsigned long addr, pte_t *pte)
849 * The soft-dirty tracker uses #PF-s to catch writes
850 * to pages, so write-protect the pte as well. See the
851 * Documentation/vm/soft-dirty.txt for full description
852 * of how soft-dirty works.
856 if (pte_present(ptent)) {
857 ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte);
858 ptent = pte_wrprotect(ptent);
859 ptent = pte_clear_soft_dirty(ptent);
860 ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent);
861 } else if (is_swap_pte(ptent)) {
862 ptent = pte_swp_clear_soft_dirty(ptent);
863 set_pte_at(vma->vm_mm, addr, pte, ptent);
867 static inline void clear_soft_dirty(struct vm_area_struct *vma,
868 unsigned long addr, pte_t *pte)
873 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
874 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
875 unsigned long addr, pmd_t *pmdp)
877 pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
879 pmd = pmd_wrprotect(pmd);
880 pmd = pmd_clear_soft_dirty(pmd);
882 if (vma->vm_flags & VM_SOFTDIRTY)
883 vma->vm_flags &= ~VM_SOFTDIRTY;
885 set_pmd_at(vma->vm_mm, addr, pmdp, pmd);
888 static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
889 unsigned long addr, pmd_t *pmdp)
894 static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
895 unsigned long end, struct mm_walk *walk)
897 struct clear_refs_private *cp = walk->private;
898 struct vm_area_struct *vma = walk->vma;
903 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
904 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
905 clear_soft_dirty_pmd(vma, addr, pmd);
909 page = pmd_page(*pmd);
911 /* Clear accessed and referenced bits. */
912 pmdp_test_and_clear_young(vma, addr, pmd);
913 test_and_clear_page_young(page);
914 ClearPageReferenced(page);
920 if (pmd_trans_unstable(pmd))
923 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
924 for (; addr != end; pte++, addr += PAGE_SIZE) {
927 if (cp->type == CLEAR_REFS_SOFT_DIRTY) {
928 clear_soft_dirty(vma, addr, pte);
932 if (!pte_present(ptent))
935 page = vm_normal_page(vma, addr, ptent);
939 /* Clear accessed and referenced bits. */
940 ptep_test_and_clear_young(vma, addr, pte);
941 test_and_clear_page_young(page);
942 ClearPageReferenced(page);
944 pte_unmap_unlock(pte - 1, ptl);
949 static int clear_refs_test_walk(unsigned long start, unsigned long end,
950 struct mm_walk *walk)
952 struct clear_refs_private *cp = walk->private;
953 struct vm_area_struct *vma = walk->vma;
955 if (vma->vm_flags & VM_PFNMAP)
959 * Writing 1 to /proc/pid/clear_refs affects all pages.
960 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
961 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
962 * Writing 4 to /proc/pid/clear_refs affects all pages.
964 if (cp->type == CLEAR_REFS_ANON && vma->vm_file)
966 if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file)
971 static ssize_t clear_refs_write(struct file *file, const char __user *buf,
972 size_t count, loff_t *ppos)
974 struct task_struct *task;
975 char buffer[PROC_NUMBUF];
976 struct mm_struct *mm;
977 struct vm_area_struct *vma;
978 enum clear_refs_types type;
982 memset(buffer, 0, sizeof(buffer));
983 if (count > sizeof(buffer) - 1)
984 count = sizeof(buffer) - 1;
985 if (copy_from_user(buffer, buf, count))
987 rv = kstrtoint(strstrip(buffer), 10, &itype);
990 type = (enum clear_refs_types)itype;
991 if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST)
994 task = get_proc_task(file_inode(file));
997 mm = get_task_mm(task);
999 struct clear_refs_private cp = {
1002 struct mm_walk clear_refs_walk = {
1003 .pmd_entry = clear_refs_pte_range,
1004 .test_walk = clear_refs_test_walk,
1009 if (type == CLEAR_REFS_MM_HIWATER_RSS) {
1011 * Writing 5 to /proc/pid/clear_refs resets the peak
1012 * resident set size to this mm's current rss value.
1014 down_write(&mm->mmap_sem);
1015 reset_mm_hiwater_rss(mm);
1016 up_write(&mm->mmap_sem);
1020 down_read(&mm->mmap_sem);
1021 if (type == CLEAR_REFS_SOFT_DIRTY) {
1022 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1023 if (!(vma->vm_flags & VM_SOFTDIRTY))
1025 up_read(&mm->mmap_sem);
1026 down_write(&mm->mmap_sem);
1027 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1028 vma->vm_flags &= ~VM_SOFTDIRTY;
1029 vma_set_page_prot(vma);
1031 downgrade_write(&mm->mmap_sem);
1034 mmu_notifier_invalidate_range_start(mm, 0, -1);
1036 walk_page_range(0, ~0UL, &clear_refs_walk);
1037 if (type == CLEAR_REFS_SOFT_DIRTY)
1038 mmu_notifier_invalidate_range_end(mm, 0, -1);
1040 up_read(&mm->mmap_sem);
1044 put_task_struct(task);
1049 const struct file_operations proc_clear_refs_operations = {
1050 .write = clear_refs_write,
1051 .llseek = noop_llseek,
1058 struct pagemapread {
1059 int pos, len; /* units: PM_ENTRY_BYTES, not bytes */
1060 pagemap_entry_t *buffer;
1064 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1065 #define PAGEMAP_WALK_MASK (PMD_MASK)
1067 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1068 #define PM_PFRAME_BITS 55
1069 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1070 #define PM_SOFT_DIRTY BIT_ULL(55)
1071 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1072 #define PM_FILE BIT_ULL(61)
1073 #define PM_SWAP BIT_ULL(62)
1074 #define PM_PRESENT BIT_ULL(63)
1076 #define PM_END_OF_BUFFER 1
1078 static inline pagemap_entry_t make_pme(u64 frame, u64 flags)
1080 return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags };
1083 static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
1084 struct pagemapread *pm)
1086 pm->buffer[pm->pos++] = *pme;
1087 if (pm->pos >= pm->len)
1088 return PM_END_OF_BUFFER;
1092 static int pagemap_pte_hole(unsigned long start, unsigned long end,
1093 struct mm_walk *walk)
1095 struct pagemapread *pm = walk->private;
1096 unsigned long addr = start;
1099 while (addr < end) {
1100 struct vm_area_struct *vma = find_vma(walk->mm, addr);
1101 pagemap_entry_t pme = make_pme(0, 0);
1102 /* End of address space hole, which we mark as non-present. */
1103 unsigned long hole_end;
1106 hole_end = min(end, vma->vm_start);
1110 for (; addr < hole_end; addr += PAGE_SIZE) {
1111 err = add_to_pagemap(addr, &pme, pm);
1119 /* Addresses in the VMA. */
1120 if (vma->vm_flags & VM_SOFTDIRTY)
1121 pme = make_pme(0, PM_SOFT_DIRTY);
1122 for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) {
1123 err = add_to_pagemap(addr, &pme, pm);
1132 static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm,
1133 struct vm_area_struct *vma, unsigned long addr, pte_t pte)
1135 u64 frame = 0, flags = 0;
1136 struct page *page = NULL;
1138 if (pte_present(pte)) {
1140 frame = pte_pfn(pte);
1141 flags |= PM_PRESENT;
1142 page = vm_normal_page(vma, addr, pte);
1143 if (pte_soft_dirty(pte))
1144 flags |= PM_SOFT_DIRTY;
1145 } else if (is_swap_pte(pte)) {
1147 if (pte_swp_soft_dirty(pte))
1148 flags |= PM_SOFT_DIRTY;
1149 entry = pte_to_swp_entry(pte);
1150 frame = swp_type(entry) |
1151 (swp_offset(entry) << MAX_SWAPFILES_SHIFT);
1153 if (is_migration_entry(entry))
1154 page = migration_entry_to_page(entry);
1157 if (page && !PageAnon(page))
1159 if (page && page_mapcount(page) == 1)
1160 flags |= PM_MMAP_EXCLUSIVE;
1161 if (vma->vm_flags & VM_SOFTDIRTY)
1162 flags |= PM_SOFT_DIRTY;
1164 return make_pme(frame, flags);
1167 static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end,
1168 struct mm_walk *walk)
1170 struct vm_area_struct *vma = walk->vma;
1171 struct pagemapread *pm = walk->private;
1173 pte_t *pte, *orig_pte;
1176 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1177 if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) {
1178 u64 flags = 0, frame = 0;
1181 if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd))
1182 flags |= PM_SOFT_DIRTY;
1185 * Currently pmd for thp is always present because thp
1186 * can not be swapped-out, migrated, or HWPOISONed
1187 * (split in such cases instead.)
1188 * This if-check is just to prepare for future implementation.
1190 if (pmd_present(pmd)) {
1191 struct page *page = pmd_page(pmd);
1193 if (page_mapcount(page) == 1)
1194 flags |= PM_MMAP_EXCLUSIVE;
1196 flags |= PM_PRESENT;
1198 frame = pmd_pfn(pmd) +
1199 ((addr & ~PMD_MASK) >> PAGE_SHIFT);
1202 for (; addr != end; addr += PAGE_SIZE) {
1203 pagemap_entry_t pme = make_pme(frame, flags);
1205 err = add_to_pagemap(addr, &pme, pm);
1208 if (pm->show_pfn && (flags & PM_PRESENT))
1215 if (pmd_trans_unstable(pmdp))
1217 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1220 * We can assume that @vma always points to a valid one and @end never
1221 * goes beyond vma->vm_end.
1223 orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl);
1224 for (; addr < end; pte++, addr += PAGE_SIZE) {
1225 pagemap_entry_t pme;
1227 pme = pte_to_pagemap_entry(pm, vma, addr, *pte);
1228 err = add_to_pagemap(addr, &pme, pm);
1232 pte_unmap_unlock(orig_pte, ptl);
1239 #ifdef CONFIG_HUGETLB_PAGE
1240 /* This function walks within one hugetlb entry in the single call */
1241 static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
1242 unsigned long addr, unsigned long end,
1243 struct mm_walk *walk)
1245 struct pagemapread *pm = walk->private;
1246 struct vm_area_struct *vma = walk->vma;
1247 u64 flags = 0, frame = 0;
1251 if (vma->vm_flags & VM_SOFTDIRTY)
1252 flags |= PM_SOFT_DIRTY;
1254 pte = huge_ptep_get(ptep);
1255 if (pte_present(pte)) {
1256 struct page *page = pte_page(pte);
1258 if (!PageAnon(page))
1261 if (page_mapcount(page) == 1)
1262 flags |= PM_MMAP_EXCLUSIVE;
1264 flags |= PM_PRESENT;
1266 frame = pte_pfn(pte) +
1267 ((addr & ~hmask) >> PAGE_SHIFT);
1270 for (; addr != end; addr += PAGE_SIZE) {
1271 pagemap_entry_t pme = make_pme(frame, flags);
1273 err = add_to_pagemap(addr, &pme, pm);
1276 if (pm->show_pfn && (flags & PM_PRESENT))
1284 #endif /* HUGETLB_PAGE */
1287 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1289 * For each page in the address space, this file contains one 64-bit entry
1290 * consisting of the following:
1292 * Bits 0-54 page frame number (PFN) if present
1293 * Bits 0-4 swap type if swapped
1294 * Bits 5-54 swap offset if swapped
1295 * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt)
1296 * Bit 56 page exclusively mapped
1298 * Bit 61 page is file-page or shared-anon
1299 * Bit 62 page swapped
1300 * Bit 63 page present
1302 * If the page is not present but in swap, then the PFN contains an
1303 * encoding of the swap file number and the page's offset into the
1304 * swap. Unmapped pages return a null PFN. This allows determining
1305 * precisely which pages are mapped (or in swap) and comparing mapped
1306 * pages between processes.
1308 * Efficient users of this interface will use /proc/pid/maps to
1309 * determine which areas of memory are actually mapped and llseek to
1310 * skip over unmapped regions.
1312 static ssize_t pagemap_read(struct file *file, char __user *buf,
1313 size_t count, loff_t *ppos)
1315 struct mm_struct *mm = file->private_data;
1316 struct pagemapread pm;
1317 struct mm_walk pagemap_walk = {};
1319 unsigned long svpfn;
1320 unsigned long start_vaddr;
1321 unsigned long end_vaddr;
1322 int ret = 0, copied = 0;
1324 if (!mm || !atomic_inc_not_zero(&mm->mm_users))
1328 /* file position must be aligned */
1329 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
1336 /* do not disclose physical addresses: attack vector */
1337 pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN);
1339 pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
1340 pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY);
1345 pagemap_walk.pmd_entry = pagemap_pmd_range;
1346 pagemap_walk.pte_hole = pagemap_pte_hole;
1347 #ifdef CONFIG_HUGETLB_PAGE
1348 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
1350 pagemap_walk.mm = mm;
1351 pagemap_walk.private = ±
1354 svpfn = src / PM_ENTRY_BYTES;
1355 start_vaddr = svpfn << PAGE_SHIFT;
1356 end_vaddr = mm->task_size;
1358 /* watch out for wraparound */
1359 if (svpfn > mm->task_size >> PAGE_SHIFT)
1360 start_vaddr = end_vaddr;
1363 * The odds are that this will stop walking way
1364 * before end_vaddr, because the length of the
1365 * user buffer is tracked in "pm", and the walk
1366 * will stop when we hit the end of the buffer.
1369 while (count && (start_vaddr < end_vaddr)) {
1374 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
1376 if (end < start_vaddr || end > end_vaddr)
1378 down_read(&mm->mmap_sem);
1379 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
1380 up_read(&mm->mmap_sem);
1383 len = min(count, PM_ENTRY_BYTES * pm.pos);
1384 if (copy_to_user(buf, pm.buffer, len)) {
1393 if (!ret || ret == PM_END_OF_BUFFER)
1404 static int pagemap_open(struct inode *inode, struct file *file)
1406 struct mm_struct *mm;
1408 mm = proc_mem_open(inode, PTRACE_MODE_READ);
1411 file->private_data = mm;
1415 static int pagemap_release(struct inode *inode, struct file *file)
1417 struct mm_struct *mm = file->private_data;
1424 const struct file_operations proc_pagemap_operations = {
1425 .llseek = mem_lseek, /* borrow this */
1426 .read = pagemap_read,
1427 .open = pagemap_open,
1428 .release = pagemap_release,
1430 #endif /* CONFIG_PROC_PAGE_MONITOR */
1435 unsigned long pages;
1437 unsigned long active;
1438 unsigned long writeback;
1439 unsigned long mapcount_max;
1440 unsigned long dirty;
1441 unsigned long swapcache;
1442 unsigned long node[MAX_NUMNODES];
1445 struct numa_maps_private {
1446 struct proc_maps_private proc_maps;
1447 struct numa_maps md;
1450 static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1451 unsigned long nr_pages)
1453 int count = page_mapcount(page);
1455 md->pages += nr_pages;
1456 if (pte_dirty || PageDirty(page))
1457 md->dirty += nr_pages;
1459 if (PageSwapCache(page))
1460 md->swapcache += nr_pages;
1462 if (PageActive(page) || PageUnevictable(page))
1463 md->active += nr_pages;
1465 if (PageWriteback(page))
1466 md->writeback += nr_pages;
1469 md->anon += nr_pages;
1471 if (count > md->mapcount_max)
1472 md->mapcount_max = count;
1474 md->node[page_to_nid(page)] += nr_pages;
1477 static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1483 if (!pte_present(pte))
1486 page = vm_normal_page(vma, addr, pte);
1490 if (PageReserved(page))
1493 nid = page_to_nid(page);
1494 if (!node_isset(nid, node_states[N_MEMORY]))
1500 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1501 static struct page *can_gather_numa_stats_pmd(pmd_t pmd,
1502 struct vm_area_struct *vma,
1508 if (!pmd_present(pmd))
1511 page = vm_normal_page_pmd(vma, addr, pmd);
1515 if (PageReserved(page))
1518 nid = page_to_nid(page);
1519 if (!node_isset(nid, node_states[N_MEMORY]))
1526 static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1527 unsigned long end, struct mm_walk *walk)
1529 struct numa_maps *md = walk->private;
1530 struct vm_area_struct *vma = walk->vma;
1535 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1536 if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) {
1539 page = can_gather_numa_stats_pmd(*pmd, vma, addr);
1541 gather_stats(page, md, pmd_dirty(*pmd),
1542 HPAGE_PMD_SIZE/PAGE_SIZE);
1547 if (pmd_trans_unstable(pmd))
1550 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1552 struct page *page = can_gather_numa_stats(*pte, vma, addr);
1555 gather_stats(page, md, pte_dirty(*pte), 1);
1557 } while (pte++, addr += PAGE_SIZE, addr != end);
1558 pte_unmap_unlock(orig_pte, ptl);
1561 #ifdef CONFIG_HUGETLB_PAGE
1562 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1563 unsigned long addr, unsigned long end, struct mm_walk *walk)
1565 pte_t huge_pte = huge_ptep_get(pte);
1566 struct numa_maps *md;
1569 if (!pte_present(huge_pte))
1572 page = pte_page(huge_pte);
1577 gather_stats(page, md, pte_dirty(huge_pte), 1);
1582 static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask,
1583 unsigned long addr, unsigned long end, struct mm_walk *walk)
1590 * Display pages allocated per node and memory policy via /proc.
1592 static int show_numa_map(struct seq_file *m, void *v, int is_pid)
1594 struct numa_maps_private *numa_priv = m->private;
1595 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
1596 struct vm_area_struct *vma = v;
1597 struct numa_maps *md = &numa_priv->md;
1598 struct file *file = vma->vm_file;
1599 struct mm_struct *mm = vma->vm_mm;
1600 struct mm_walk walk = {
1601 .hugetlb_entry = gather_hugetlb_stats,
1602 .pmd_entry = gather_pte_stats,
1606 struct mempolicy *pol;
1613 /* Ensure we start with an empty set of numa_maps statistics. */
1614 memset(md, 0, sizeof(*md));
1616 pol = __get_vma_policy(vma, vma->vm_start);
1618 mpol_to_str(buffer, sizeof(buffer), pol);
1621 mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy);
1624 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1627 seq_puts(m, " file=");
1628 seq_file_path(m, file, "\n\t= ");
1629 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1630 seq_puts(m, " heap");
1632 pid_t tid = pid_of_stack(proc_priv, vma, is_pid);
1635 * Thread stack in /proc/PID/task/TID/maps or
1636 * the main process stack.
1638 if (!is_pid || (vma->vm_start <= mm->start_stack &&
1639 vma->vm_end >= mm->start_stack))
1640 seq_puts(m, " stack");
1642 seq_printf(m, " stack:%d", tid);
1646 if (is_vm_hugetlb_page(vma))
1647 seq_puts(m, " huge");
1649 /* mmap_sem is held by m_start */
1650 walk_page_vma(vma, &walk);
1656 seq_printf(m, " anon=%lu", md->anon);
1659 seq_printf(m, " dirty=%lu", md->dirty);
1661 if (md->pages != md->anon && md->pages != md->dirty)
1662 seq_printf(m, " mapped=%lu", md->pages);
1664 if (md->mapcount_max > 1)
1665 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1668 seq_printf(m, " swapcache=%lu", md->swapcache);
1670 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1671 seq_printf(m, " active=%lu", md->active);
1674 seq_printf(m, " writeback=%lu", md->writeback);
1676 for_each_node_state(nid, N_MEMORY)
1678 seq_printf(m, " N%d=%lu", nid, md->node[nid]);
1680 seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10);
1683 m_cache_vma(m, vma);
1687 static int show_pid_numa_map(struct seq_file *m, void *v)
1689 return show_numa_map(m, v, 1);
1692 static int show_tid_numa_map(struct seq_file *m, void *v)
1694 return show_numa_map(m, v, 0);
1697 static const struct seq_operations proc_pid_numa_maps_op = {
1701 .show = show_pid_numa_map,
1704 static const struct seq_operations proc_tid_numa_maps_op = {
1708 .show = show_tid_numa_map,
1711 static int numa_maps_open(struct inode *inode, struct file *file,
1712 const struct seq_operations *ops)
1714 return proc_maps_open(inode, file, ops,
1715 sizeof(struct numa_maps_private));
1718 static int pid_numa_maps_open(struct inode *inode, struct file *file)
1720 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1723 static int tid_numa_maps_open(struct inode *inode, struct file *file)
1725 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1728 const struct file_operations proc_pid_numa_maps_operations = {
1729 .open = pid_numa_maps_open,
1731 .llseek = seq_lseek,
1732 .release = proc_map_release,
1735 const struct file_operations proc_tid_numa_maps_operations = {
1736 .open = tid_numa_maps_open,
1738 .llseek = seq_lseek,
1739 .release = proc_map_release,
1741 #endif /* CONFIG_NUMA */