1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pagewalk.h>
3 #include <linux/vmacache.h>
4 #include <linux/hugetlb.h>
5 #include <linux/huge_mm.h>
6 #include <linux/mount.h>
7 #include <linux/seq_file.h>
8 #include <linux/highmem.h>
9 #include <linux/ptrace.h>
10 #include <linux/slab.h>
11 #include <linux/pagemap.h>
12 #include <linux/mempolicy.h>
13 #include <linux/rmap.h>
14 #include <linux/swap.h>
15 #include <linux/sched/mm.h>
16 #include <linux/swapops.h>
17 #include <linux/mmu_notifier.h>
18 #include <linux/page_idle.h>
19 #include <linux/shmem_fs.h>
20 #include <linux/uaccess.h>
21 #include <linux/pkeys.h>
25 #include <asm/tlbflush.h>
28 #define SEQ_PUT_DEC(str, val) \
29 seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8)
30 void task_mem(struct seq_file
*m
, struct mm_struct
*mm
)
32 unsigned long text
, lib
, swap
, anon
, file
, shmem
;
33 unsigned long hiwater_vm
, total_vm
, hiwater_rss
, total_rss
;
35 anon
= get_mm_counter(mm
, MM_ANONPAGES
);
36 file
= get_mm_counter(mm
, MM_FILEPAGES
);
37 shmem
= get_mm_counter(mm
, MM_SHMEMPAGES
);
40 * Note: to minimize their overhead, mm maintains hiwater_vm and
41 * hiwater_rss only when about to *lower* total_vm or rss. Any
42 * collector of these hiwater stats must therefore get total_vm
43 * and rss too, which will usually be the higher. Barriers? not
44 * worth the effort, such snapshots can always be inconsistent.
46 hiwater_vm
= total_vm
= mm
->total_vm
;
47 if (hiwater_vm
< mm
->hiwater_vm
)
48 hiwater_vm
= mm
->hiwater_vm
;
49 hiwater_rss
= total_rss
= anon
+ file
+ shmem
;
50 if (hiwater_rss
< mm
->hiwater_rss
)
51 hiwater_rss
= mm
->hiwater_rss
;
53 /* split executable areas between text and lib */
54 text
= PAGE_ALIGN(mm
->end_code
) - (mm
->start_code
& PAGE_MASK
);
55 text
= min(text
, mm
->exec_vm
<< PAGE_SHIFT
);
56 lib
= (mm
->exec_vm
<< PAGE_SHIFT
) - text
;
58 swap
= get_mm_counter(mm
, MM_SWAPENTS
);
59 SEQ_PUT_DEC("VmPeak:\t", hiwater_vm
);
60 SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm
);
61 SEQ_PUT_DEC(" kB\nVmLck:\t", mm
->locked_vm
);
62 SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm
->pinned_vm
));
63 SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss
);
64 SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss
);
65 SEQ_PUT_DEC(" kB\nRssAnon:\t", anon
);
66 SEQ_PUT_DEC(" kB\nRssFile:\t", file
);
67 SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem
);
68 SEQ_PUT_DEC(" kB\nVmData:\t", mm
->data_vm
);
69 SEQ_PUT_DEC(" kB\nVmStk:\t", mm
->stack_vm
);
70 seq_put_decimal_ull_width(m
,
71 " kB\nVmExe:\t", text
>> 10, 8);
72 seq_put_decimal_ull_width(m
,
73 " kB\nVmLib:\t", lib
>> 10, 8);
74 seq_put_decimal_ull_width(m
,
75 " kB\nVmPTE:\t", mm_pgtables_bytes(mm
) >> 10, 8);
76 SEQ_PUT_DEC(" kB\nVmSwap:\t", swap
);
78 hugetlb_report_usage(m
, mm
);
82 unsigned long task_vsize(struct mm_struct
*mm
)
84 return PAGE_SIZE
* mm
->total_vm
;
87 unsigned long task_statm(struct mm_struct
*mm
,
88 unsigned long *shared
, unsigned long *text
,
89 unsigned long *data
, unsigned long *resident
)
91 *shared
= get_mm_counter(mm
, MM_FILEPAGES
) +
92 get_mm_counter(mm
, MM_SHMEMPAGES
);
93 *text
= (PAGE_ALIGN(mm
->end_code
) - (mm
->start_code
& PAGE_MASK
))
95 *data
= mm
->data_vm
+ mm
->stack_vm
;
96 *resident
= *shared
+ get_mm_counter(mm
, MM_ANONPAGES
);
102 * Save get_task_policy() for show_numa_map().
104 static void hold_task_mempolicy(struct proc_maps_private
*priv
)
106 struct task_struct
*task
= priv
->task
;
109 priv
->task_mempolicy
= get_task_policy(task
);
110 mpol_get(priv
->task_mempolicy
);
113 static void release_task_mempolicy(struct proc_maps_private
*priv
)
115 mpol_put(priv
->task_mempolicy
);
118 static void hold_task_mempolicy(struct proc_maps_private
*priv
)
121 static void release_task_mempolicy(struct proc_maps_private
*priv
)
126 static void *m_start(struct seq_file
*m
, loff_t
*ppos
)
128 struct proc_maps_private
*priv
= m
->private;
129 unsigned long last_addr
= *ppos
;
130 struct mm_struct
*mm
;
131 struct vm_area_struct
*vma
;
133 /* See m_next(). Zero at the start or after lseek. */
134 if (last_addr
== -1UL)
137 priv
->task
= get_proc_task(priv
->inode
);
139 return ERR_PTR(-ESRCH
);
142 if (!mm
|| !mmget_not_zero(mm
)) {
143 put_task_struct(priv
->task
);
148 if (down_read_killable(&mm
->mmap_sem
)) {
150 put_task_struct(priv
->task
);
152 return ERR_PTR(-EINTR
);
155 hold_task_mempolicy(priv
);
156 priv
->tail_vma
= get_gate_vma(mm
);
158 vma
= find_vma(mm
, last_addr
);
162 return priv
->tail_vma
;
165 static void *m_next(struct seq_file
*m
, void *v
, loff_t
*ppos
)
167 struct proc_maps_private
*priv
= m
->private;
168 struct vm_area_struct
*next
, *vma
= v
;
170 if (vma
== priv
->tail_vma
)
172 else if (vma
->vm_next
)
175 next
= priv
->tail_vma
;
177 *ppos
= next
? next
->vm_start
: -1UL;
182 static void m_stop(struct seq_file
*m
, void *v
)
184 struct proc_maps_private
*priv
= m
->private;
185 struct mm_struct
*mm
= priv
->mm
;
190 release_task_mempolicy(priv
);
191 up_read(&mm
->mmap_sem
);
193 put_task_struct(priv
->task
);
197 static int proc_maps_open(struct inode
*inode
, struct file
*file
,
198 const struct seq_operations
*ops
, int psize
)
200 struct proc_maps_private
*priv
= __seq_open_private(file
, ops
, psize
);
206 priv
->mm
= proc_mem_open(inode
, PTRACE_MODE_READ
);
207 if (IS_ERR(priv
->mm
)) {
208 int err
= PTR_ERR(priv
->mm
);
210 seq_release_private(inode
, file
);
217 static int proc_map_release(struct inode
*inode
, struct file
*file
)
219 struct seq_file
*seq
= file
->private_data
;
220 struct proc_maps_private
*priv
= seq
->private;
225 return seq_release_private(inode
, file
);
228 static int do_maps_open(struct inode
*inode
, struct file
*file
,
229 const struct seq_operations
*ops
)
231 return proc_maps_open(inode
, file
, ops
,
232 sizeof(struct proc_maps_private
));
236 * Indicate if the VMA is a stack for the given task; for
237 * /proc/PID/maps that is the stack of the main task.
239 static int is_stack(struct vm_area_struct
*vma
)
242 * We make no effort to guess what a given thread considers to be
243 * its "stack". It's not even well-defined for programs written
246 return vma
->vm_start
<= vma
->vm_mm
->start_stack
&&
247 vma
->vm_end
>= vma
->vm_mm
->start_stack
;
250 static void show_vma_header_prefix(struct seq_file
*m
,
251 unsigned long start
, unsigned long end
,
252 vm_flags_t flags
, unsigned long long pgoff
,
253 dev_t dev
, unsigned long ino
)
255 seq_setwidth(m
, 25 + sizeof(void *) * 6 - 1);
256 seq_put_hex_ll(m
, NULL
, start
, 8);
257 seq_put_hex_ll(m
, "-", end
, 8);
259 seq_putc(m
, flags
& VM_READ
? 'r' : '-');
260 seq_putc(m
, flags
& VM_WRITE
? 'w' : '-');
261 seq_putc(m
, flags
& VM_EXEC
? 'x' : '-');
262 seq_putc(m
, flags
& VM_MAYSHARE
? 's' : 'p');
263 seq_put_hex_ll(m
, " ", pgoff
, 8);
264 seq_put_hex_ll(m
, " ", MAJOR(dev
), 2);
265 seq_put_hex_ll(m
, ":", MINOR(dev
), 2);
266 seq_put_decimal_ull(m
, " ", ino
);
271 show_map_vma(struct seq_file
*m
, struct vm_area_struct
*vma
)
273 struct mm_struct
*mm
= vma
->vm_mm
;
274 struct file
*file
= vma
->vm_file
;
275 vm_flags_t flags
= vma
->vm_flags
;
276 unsigned long ino
= 0;
277 unsigned long long pgoff
= 0;
278 unsigned long start
, end
;
280 const char *name
= NULL
;
283 struct inode
*inode
= file_inode(vma
->vm_file
);
284 dev
= inode
->i_sb
->s_dev
;
286 pgoff
= ((loff_t
)vma
->vm_pgoff
) << PAGE_SHIFT
;
289 start
= vma
->vm_start
;
291 show_vma_header_prefix(m
, start
, end
, flags
, pgoff
, dev
, ino
);
294 * Print the dentry name for named mappings, and a
295 * special [heap] marker for the heap:
299 seq_file_path(m
, file
, "\n");
303 if (vma
->vm_ops
&& vma
->vm_ops
->name
) {
304 name
= vma
->vm_ops
->name(vma
);
309 name
= arch_vma_name(vma
);
316 if (vma
->vm_start
<= mm
->brk
&&
317 vma
->vm_end
>= mm
->start_brk
) {
334 static int show_map(struct seq_file
*m
, void *v
)
340 static const struct seq_operations proc_pid_maps_op
= {
347 static int pid_maps_open(struct inode
*inode
, struct file
*file
)
349 return do_maps_open(inode
, file
, &proc_pid_maps_op
);
352 const struct file_operations proc_pid_maps_operations
= {
353 .open
= pid_maps_open
,
356 .release
= proc_map_release
,
360 * Proportional Set Size(PSS): my share of RSS.
362 * PSS of a process is the count of pages it has in memory, where each
363 * page is divided by the number of processes sharing it. So if a
364 * process has 1000 pages all to itself, and 1000 shared with one other
365 * process, its PSS will be 1500.
367 * To keep (accumulated) division errors low, we adopt a 64bit
368 * fixed-point pss counter to minimize division errors. So (pss >>
369 * PSS_SHIFT) would be the real byte count.
371 * A shift of 12 before division means (assuming 4K page size):
372 * - 1M 3-user-pages add up to 8KB errors;
373 * - supports mapcount up to 2^24, or 16M;
374 * - supports PSS up to 2^52 bytes, or 4PB.
378 #ifdef CONFIG_PROC_PAGE_MONITOR
379 struct mem_size_stats
{
380 unsigned long resident
;
381 unsigned long shared_clean
;
382 unsigned long shared_dirty
;
383 unsigned long private_clean
;
384 unsigned long private_dirty
;
385 unsigned long referenced
;
386 unsigned long anonymous
;
387 unsigned long lazyfree
;
388 unsigned long anonymous_thp
;
389 unsigned long shmem_thp
;
390 unsigned long file_thp
;
392 unsigned long shared_hugetlb
;
393 unsigned long private_hugetlb
;
400 bool check_shmem_swap
;
403 static void smaps_page_accumulate(struct mem_size_stats
*mss
,
404 struct page
*page
, unsigned long size
, unsigned long pss
,
405 bool dirty
, bool locked
, bool private)
410 mss
->pss_anon
+= pss
;
411 else if (PageSwapBacked(page
))
412 mss
->pss_shmem
+= pss
;
414 mss
->pss_file
+= pss
;
417 mss
->pss_locked
+= pss
;
419 if (dirty
|| PageDirty(page
)) {
421 mss
->private_dirty
+= size
;
423 mss
->shared_dirty
+= size
;
426 mss
->private_clean
+= size
;
428 mss
->shared_clean
+= size
;
432 static void smaps_account(struct mem_size_stats
*mss
, struct page
*page
,
433 bool compound
, bool young
, bool dirty
, bool locked
)
435 int i
, nr
= compound
? compound_nr(page
) : 1;
436 unsigned long size
= nr
* PAGE_SIZE
;
439 * First accumulate quantities that depend only on |size| and the type
440 * of the compound page.
442 if (PageAnon(page
)) {
443 mss
->anonymous
+= size
;
444 if (!PageSwapBacked(page
) && !dirty
&& !PageDirty(page
))
445 mss
->lazyfree
+= size
;
448 mss
->resident
+= size
;
449 /* Accumulate the size in pages that have been accessed. */
450 if (young
|| page_is_young(page
) || PageReferenced(page
))
451 mss
->referenced
+= size
;
454 * Then accumulate quantities that may depend on sharing, or that may
455 * differ page-by-page.
457 * page_count(page) == 1 guarantees the page is mapped exactly once.
458 * If any subpage of the compound page mapped with PTE it would elevate
461 if (page_count(page
) == 1) {
462 smaps_page_accumulate(mss
, page
, size
, size
<< PSS_SHIFT
, dirty
,
466 for (i
= 0; i
< nr
; i
++, page
++) {
467 int mapcount
= page_mapcount(page
);
468 unsigned long pss
= PAGE_SIZE
<< PSS_SHIFT
;
471 smaps_page_accumulate(mss
, page
, PAGE_SIZE
, pss
, dirty
, locked
,
477 static int smaps_pte_hole(unsigned long addr
, unsigned long end
,
478 __always_unused
int depth
, struct mm_walk
*walk
)
480 struct mem_size_stats
*mss
= walk
->private;
482 mss
->swap
+= shmem_partial_swap_usage(
483 walk
->vma
->vm_file
->f_mapping
, addr
, end
);
488 #define smaps_pte_hole NULL
489 #endif /* CONFIG_SHMEM */
491 static void smaps_pte_entry(pte_t
*pte
, unsigned long addr
,
492 struct mm_walk
*walk
)
494 struct mem_size_stats
*mss
= walk
->private;
495 struct vm_area_struct
*vma
= walk
->vma
;
496 bool locked
= !!(vma
->vm_flags
& VM_LOCKED
);
497 struct page
*page
= NULL
;
499 if (pte_present(*pte
)) {
500 page
= vm_normal_page(vma
, addr
, *pte
);
501 } else if (is_swap_pte(*pte
)) {
502 swp_entry_t swpent
= pte_to_swp_entry(*pte
);
504 if (!non_swap_entry(swpent
)) {
507 mss
->swap
+= PAGE_SIZE
;
508 mapcount
= swp_swapcount(swpent
);
510 u64 pss_delta
= (u64
)PAGE_SIZE
<< PSS_SHIFT
;
512 do_div(pss_delta
, mapcount
);
513 mss
->swap_pss
+= pss_delta
;
515 mss
->swap_pss
+= (u64
)PAGE_SIZE
<< PSS_SHIFT
;
517 } else if (is_migration_entry(swpent
))
518 page
= migration_entry_to_page(swpent
);
519 else if (is_device_private_entry(swpent
))
520 page
= device_private_entry_to_page(swpent
);
521 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM
) && mss
->check_shmem_swap
522 && pte_none(*pte
))) {
523 page
= find_get_entry(vma
->vm_file
->f_mapping
,
524 linear_page_index(vma
, addr
));
528 if (xa_is_value(page
))
529 mss
->swap
+= PAGE_SIZE
;
539 smaps_account(mss
, page
, false, pte_young(*pte
), pte_dirty(*pte
), locked
);
542 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
543 static void smaps_pmd_entry(pmd_t
*pmd
, unsigned long addr
,
544 struct mm_walk
*walk
)
546 struct mem_size_stats
*mss
= walk
->private;
547 struct vm_area_struct
*vma
= walk
->vma
;
548 bool locked
= !!(vma
->vm_flags
& VM_LOCKED
);
549 struct page
*page
= NULL
;
551 if (pmd_present(*pmd
)) {
552 /* FOLL_DUMP will return -EFAULT on huge zero page */
553 page
= follow_trans_huge_pmd(vma
, addr
, pmd
, FOLL_DUMP
);
554 } else if (unlikely(thp_migration_supported() && is_swap_pmd(*pmd
))) {
555 swp_entry_t entry
= pmd_to_swp_entry(*pmd
);
557 if (is_migration_entry(entry
))
558 page
= migration_entry_to_page(entry
);
560 if (IS_ERR_OR_NULL(page
))
563 mss
->anonymous_thp
+= HPAGE_PMD_SIZE
;
564 else if (PageSwapBacked(page
))
565 mss
->shmem_thp
+= HPAGE_PMD_SIZE
;
566 else if (is_zone_device_page(page
))
569 mss
->file_thp
+= HPAGE_PMD_SIZE
;
570 smaps_account(mss
, page
, true, pmd_young(*pmd
), pmd_dirty(*pmd
), locked
);
573 static void smaps_pmd_entry(pmd_t
*pmd
, unsigned long addr
,
574 struct mm_walk
*walk
)
579 static int smaps_pte_range(pmd_t
*pmd
, unsigned long addr
, unsigned long end
,
580 struct mm_walk
*walk
)
582 struct vm_area_struct
*vma
= walk
->vma
;
586 ptl
= pmd_trans_huge_lock(pmd
, vma
);
588 smaps_pmd_entry(pmd
, addr
, walk
);
593 if (pmd_trans_unstable(pmd
))
596 * The mmap_sem held all the way back in m_start() is what
597 * keeps khugepaged out of here and from collapsing things
600 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
601 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
)
602 smaps_pte_entry(pte
, addr
, walk
);
603 pte_unmap_unlock(pte
- 1, ptl
);
609 static void show_smap_vma_flags(struct seq_file
*m
, struct vm_area_struct
*vma
)
612 * Don't forget to update Documentation/ on changes.
614 static const char mnemonics
[BITS_PER_LONG
][2] = {
616 * In case if we meet a flag we don't know about.
618 [0 ... (BITS_PER_LONG
-1)] = "??",
620 [ilog2(VM_READ
)] = "rd",
621 [ilog2(VM_WRITE
)] = "wr",
622 [ilog2(VM_EXEC
)] = "ex",
623 [ilog2(VM_SHARED
)] = "sh",
624 [ilog2(VM_MAYREAD
)] = "mr",
625 [ilog2(VM_MAYWRITE
)] = "mw",
626 [ilog2(VM_MAYEXEC
)] = "me",
627 [ilog2(VM_MAYSHARE
)] = "ms",
628 [ilog2(VM_GROWSDOWN
)] = "gd",
629 [ilog2(VM_PFNMAP
)] = "pf",
630 [ilog2(VM_DENYWRITE
)] = "dw",
631 [ilog2(VM_LOCKED
)] = "lo",
632 [ilog2(VM_IO
)] = "io",
633 [ilog2(VM_SEQ_READ
)] = "sr",
634 [ilog2(VM_RAND_READ
)] = "rr",
635 [ilog2(VM_DONTCOPY
)] = "dc",
636 [ilog2(VM_DONTEXPAND
)] = "de",
637 [ilog2(VM_ACCOUNT
)] = "ac",
638 [ilog2(VM_NORESERVE
)] = "nr",
639 [ilog2(VM_HUGETLB
)] = "ht",
640 [ilog2(VM_SYNC
)] = "sf",
641 [ilog2(VM_ARCH_1
)] = "ar",
642 [ilog2(VM_WIPEONFORK
)] = "wf",
643 [ilog2(VM_DONTDUMP
)] = "dd",
644 #ifdef CONFIG_ARM64_BTI
645 [ilog2(VM_ARM64_BTI
)] = "bt",
647 #ifdef CONFIG_MEM_SOFT_DIRTY
648 [ilog2(VM_SOFTDIRTY
)] = "sd",
650 [ilog2(VM_MIXEDMAP
)] = "mm",
651 [ilog2(VM_HUGEPAGE
)] = "hg",
652 [ilog2(VM_NOHUGEPAGE
)] = "nh",
653 [ilog2(VM_MERGEABLE
)] = "mg",
654 [ilog2(VM_UFFD_MISSING
)]= "um",
655 [ilog2(VM_UFFD_WP
)] = "uw",
656 #ifdef CONFIG_ARCH_HAS_PKEYS
657 /* These come out via ProtectionKey: */
658 [ilog2(VM_PKEY_BIT0
)] = "",
659 [ilog2(VM_PKEY_BIT1
)] = "",
660 [ilog2(VM_PKEY_BIT2
)] = "",
661 [ilog2(VM_PKEY_BIT3
)] = "",
663 [ilog2(VM_PKEY_BIT4
)] = "",
665 #endif /* CONFIG_ARCH_HAS_PKEYS */
669 seq_puts(m
, "VmFlags: ");
670 for (i
= 0; i
< BITS_PER_LONG
; i
++) {
671 if (!mnemonics
[i
][0])
673 if (vma
->vm_flags
& (1UL << i
)) {
674 seq_putc(m
, mnemonics
[i
][0]);
675 seq_putc(m
, mnemonics
[i
][1]);
682 #ifdef CONFIG_HUGETLB_PAGE
683 static int smaps_hugetlb_range(pte_t
*pte
, unsigned long hmask
,
684 unsigned long addr
, unsigned long end
,
685 struct mm_walk
*walk
)
687 struct mem_size_stats
*mss
= walk
->private;
688 struct vm_area_struct
*vma
= walk
->vma
;
689 struct page
*page
= NULL
;
691 if (pte_present(*pte
)) {
692 page
= vm_normal_page(vma
, addr
, *pte
);
693 } else if (is_swap_pte(*pte
)) {
694 swp_entry_t swpent
= pte_to_swp_entry(*pte
);
696 if (is_migration_entry(swpent
))
697 page
= migration_entry_to_page(swpent
);
698 else if (is_device_private_entry(swpent
))
699 page
= device_private_entry_to_page(swpent
);
702 int mapcount
= page_mapcount(page
);
705 mss
->shared_hugetlb
+= huge_page_size(hstate_vma(vma
));
707 mss
->private_hugetlb
+= huge_page_size(hstate_vma(vma
));
712 #define smaps_hugetlb_range NULL
713 #endif /* HUGETLB_PAGE */
715 static const struct mm_walk_ops smaps_walk_ops
= {
716 .pmd_entry
= smaps_pte_range
,
717 .hugetlb_entry
= smaps_hugetlb_range
,
720 static const struct mm_walk_ops smaps_shmem_walk_ops
= {
721 .pmd_entry
= smaps_pte_range
,
722 .hugetlb_entry
= smaps_hugetlb_range
,
723 .pte_hole
= smaps_pte_hole
,
726 static void smap_gather_stats(struct vm_area_struct
*vma
,
727 struct mem_size_stats
*mss
)
730 /* In case of smaps_rollup, reset the value from previous vma */
731 mss
->check_shmem_swap
= false;
732 if (vma
->vm_file
&& shmem_mapping(vma
->vm_file
->f_mapping
)) {
734 * For shared or readonly shmem mappings we know that all
735 * swapped out pages belong to the shmem object, and we can
736 * obtain the swap value much more efficiently. For private
737 * writable mappings, we might have COW pages that are
738 * not affected by the parent swapped out pages of the shmem
739 * object, so we have to distinguish them during the page walk.
740 * Unless we know that the shmem object (or the part mapped by
741 * our VMA) has no swapped out pages at all.
743 unsigned long shmem_swapped
= shmem_swap_usage(vma
);
745 if (!shmem_swapped
|| (vma
->vm_flags
& VM_SHARED
) ||
746 !(vma
->vm_flags
& VM_WRITE
)) {
747 mss
->swap
+= shmem_swapped
;
749 mss
->check_shmem_swap
= true;
750 walk_page_vma(vma
, &smaps_shmem_walk_ops
, mss
);
755 /* mmap_sem is held in m_start */
756 walk_page_vma(vma
, &smaps_walk_ops
, mss
);
759 #define SEQ_PUT_DEC(str, val) \
760 seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
762 /* Show the contents common for smaps and smaps_rollup */
763 static void __show_smap(struct seq_file
*m
, const struct mem_size_stats
*mss
,
766 SEQ_PUT_DEC("Rss: ", mss
->resident
);
767 SEQ_PUT_DEC(" kB\nPss: ", mss
->pss
>> PSS_SHIFT
);
770 * These are meaningful only for smaps_rollup, otherwise two of
771 * them are zero, and the other one is the same as Pss.
773 SEQ_PUT_DEC(" kB\nPss_Anon: ",
774 mss
->pss_anon
>> PSS_SHIFT
);
775 SEQ_PUT_DEC(" kB\nPss_File: ",
776 mss
->pss_file
>> PSS_SHIFT
);
777 SEQ_PUT_DEC(" kB\nPss_Shmem: ",
778 mss
->pss_shmem
>> PSS_SHIFT
);
780 SEQ_PUT_DEC(" kB\nShared_Clean: ", mss
->shared_clean
);
781 SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss
->shared_dirty
);
782 SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss
->private_clean
);
783 SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss
->private_dirty
);
784 SEQ_PUT_DEC(" kB\nReferenced: ", mss
->referenced
);
785 SEQ_PUT_DEC(" kB\nAnonymous: ", mss
->anonymous
);
786 SEQ_PUT_DEC(" kB\nLazyFree: ", mss
->lazyfree
);
787 SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss
->anonymous_thp
);
788 SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss
->shmem_thp
);
789 SEQ_PUT_DEC(" kB\nFilePmdMapped: ", mss
->file_thp
);
790 SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss
->shared_hugetlb
);
791 seq_put_decimal_ull_width(m
, " kB\nPrivate_Hugetlb: ",
792 mss
->private_hugetlb
>> 10, 7);
793 SEQ_PUT_DEC(" kB\nSwap: ", mss
->swap
);
794 SEQ_PUT_DEC(" kB\nSwapPss: ",
795 mss
->swap_pss
>> PSS_SHIFT
);
796 SEQ_PUT_DEC(" kB\nLocked: ",
797 mss
->pss_locked
>> PSS_SHIFT
);
798 seq_puts(m
, " kB\n");
801 static int show_smap(struct seq_file
*m
, void *v
)
803 struct vm_area_struct
*vma
= v
;
804 struct mem_size_stats mss
;
806 memset(&mss
, 0, sizeof(mss
));
808 smap_gather_stats(vma
, &mss
);
810 show_map_vma(m
, vma
);
812 SEQ_PUT_DEC("Size: ", vma
->vm_end
- vma
->vm_start
);
813 SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma
));
814 SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma
));
815 seq_puts(m
, " kB\n");
817 __show_smap(m
, &mss
, false);
819 seq_printf(m
, "THPeligible: %d\n",
820 transparent_hugepage_enabled(vma
));
822 if (arch_pkeys_enabled())
823 seq_printf(m
, "ProtectionKey: %8u\n", vma_pkey(vma
));
824 show_smap_vma_flags(m
, vma
);
829 static int show_smaps_rollup(struct seq_file
*m
, void *v
)
831 struct proc_maps_private
*priv
= m
->private;
832 struct mem_size_stats mss
;
833 struct mm_struct
*mm
;
834 struct vm_area_struct
*vma
;
835 unsigned long last_vma_end
= 0;
838 priv
->task
= get_proc_task(priv
->inode
);
843 if (!mm
|| !mmget_not_zero(mm
)) {
848 memset(&mss
, 0, sizeof(mss
));
850 ret
= down_read_killable(&mm
->mmap_sem
);
854 hold_task_mempolicy(priv
);
856 for (vma
= priv
->mm
->mmap
; vma
; vma
= vma
->vm_next
) {
857 smap_gather_stats(vma
, &mss
);
858 last_vma_end
= vma
->vm_end
;
861 show_vma_header_prefix(m
, priv
->mm
->mmap
->vm_start
,
862 last_vma_end
, 0, 0, 0, 0);
864 seq_puts(m
, "[rollup]\n");
866 __show_smap(m
, &mss
, true);
868 release_task_mempolicy(priv
);
869 up_read(&mm
->mmap_sem
);
874 put_task_struct(priv
->task
);
881 static const struct seq_operations proc_pid_smaps_op
= {
888 static int pid_smaps_open(struct inode
*inode
, struct file
*file
)
890 return do_maps_open(inode
, file
, &proc_pid_smaps_op
);
893 static int smaps_rollup_open(struct inode
*inode
, struct file
*file
)
896 struct proc_maps_private
*priv
;
898 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL_ACCOUNT
);
902 ret
= single_open(file
, show_smaps_rollup
, priv
);
907 priv
->mm
= proc_mem_open(inode
, PTRACE_MODE_READ
);
908 if (IS_ERR(priv
->mm
)) {
909 ret
= PTR_ERR(priv
->mm
);
911 single_release(inode
, file
);
922 static int smaps_rollup_release(struct inode
*inode
, struct file
*file
)
924 struct seq_file
*seq
= file
->private_data
;
925 struct proc_maps_private
*priv
= seq
->private;
931 return single_release(inode
, file
);
934 const struct file_operations proc_pid_smaps_operations
= {
935 .open
= pid_smaps_open
,
938 .release
= proc_map_release
,
941 const struct file_operations proc_pid_smaps_rollup_operations
= {
942 .open
= smaps_rollup_open
,
945 .release
= smaps_rollup_release
,
948 enum clear_refs_types
{
952 CLEAR_REFS_SOFT_DIRTY
,
953 CLEAR_REFS_MM_HIWATER_RSS
,
957 struct clear_refs_private
{
958 enum clear_refs_types type
;
961 #ifdef CONFIG_MEM_SOFT_DIRTY
962 static inline void clear_soft_dirty(struct vm_area_struct
*vma
,
963 unsigned long addr
, pte_t
*pte
)
966 * The soft-dirty tracker uses #PF-s to catch writes
967 * to pages, so write-protect the pte as well. See the
968 * Documentation/admin-guide/mm/soft-dirty.rst for full description
969 * of how soft-dirty works.
973 if (pte_present(ptent
)) {
976 old_pte
= ptep_modify_prot_start(vma
, addr
, pte
);
977 ptent
= pte_wrprotect(old_pte
);
978 ptent
= pte_clear_soft_dirty(ptent
);
979 ptep_modify_prot_commit(vma
, addr
, pte
, old_pte
, ptent
);
980 } else if (is_swap_pte(ptent
)) {
981 ptent
= pte_swp_clear_soft_dirty(ptent
);
982 set_pte_at(vma
->vm_mm
, addr
, pte
, ptent
);
986 static inline void clear_soft_dirty(struct vm_area_struct
*vma
,
987 unsigned long addr
, pte_t
*pte
)
992 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
993 static inline void clear_soft_dirty_pmd(struct vm_area_struct
*vma
,
994 unsigned long addr
, pmd_t
*pmdp
)
996 pmd_t old
, pmd
= *pmdp
;
998 if (pmd_present(pmd
)) {
999 /* See comment in change_huge_pmd() */
1000 old
= pmdp_invalidate(vma
, addr
, pmdp
);
1002 pmd
= pmd_mkdirty(pmd
);
1004 pmd
= pmd_mkyoung(pmd
);
1006 pmd
= pmd_wrprotect(pmd
);
1007 pmd
= pmd_clear_soft_dirty(pmd
);
1009 set_pmd_at(vma
->vm_mm
, addr
, pmdp
, pmd
);
1010 } else if (is_migration_entry(pmd_to_swp_entry(pmd
))) {
1011 pmd
= pmd_swp_clear_soft_dirty(pmd
);
1012 set_pmd_at(vma
->vm_mm
, addr
, pmdp
, pmd
);
1016 static inline void clear_soft_dirty_pmd(struct vm_area_struct
*vma
,
1017 unsigned long addr
, pmd_t
*pmdp
)
1022 static int clear_refs_pte_range(pmd_t
*pmd
, unsigned long addr
,
1023 unsigned long end
, struct mm_walk
*walk
)
1025 struct clear_refs_private
*cp
= walk
->private;
1026 struct vm_area_struct
*vma
= walk
->vma
;
1031 ptl
= pmd_trans_huge_lock(pmd
, vma
);
1033 if (cp
->type
== CLEAR_REFS_SOFT_DIRTY
) {
1034 clear_soft_dirty_pmd(vma
, addr
, pmd
);
1038 if (!pmd_present(*pmd
))
1041 page
= pmd_page(*pmd
);
1043 /* Clear accessed and referenced bits. */
1044 pmdp_test_and_clear_young(vma
, addr
, pmd
);
1045 test_and_clear_page_young(page
);
1046 ClearPageReferenced(page
);
1052 if (pmd_trans_unstable(pmd
))
1055 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
1056 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
) {
1059 if (cp
->type
== CLEAR_REFS_SOFT_DIRTY
) {
1060 clear_soft_dirty(vma
, addr
, pte
);
1064 if (!pte_present(ptent
))
1067 page
= vm_normal_page(vma
, addr
, ptent
);
1071 /* Clear accessed and referenced bits. */
1072 ptep_test_and_clear_young(vma
, addr
, pte
);
1073 test_and_clear_page_young(page
);
1074 ClearPageReferenced(page
);
1076 pte_unmap_unlock(pte
- 1, ptl
);
1081 static int clear_refs_test_walk(unsigned long start
, unsigned long end
,
1082 struct mm_walk
*walk
)
1084 struct clear_refs_private
*cp
= walk
->private;
1085 struct vm_area_struct
*vma
= walk
->vma
;
1087 if (vma
->vm_flags
& VM_PFNMAP
)
1091 * Writing 1 to /proc/pid/clear_refs affects all pages.
1092 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
1093 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
1094 * Writing 4 to /proc/pid/clear_refs affects all pages.
1096 if (cp
->type
== CLEAR_REFS_ANON
&& vma
->vm_file
)
1098 if (cp
->type
== CLEAR_REFS_MAPPED
&& !vma
->vm_file
)
1103 static const struct mm_walk_ops clear_refs_walk_ops
= {
1104 .pmd_entry
= clear_refs_pte_range
,
1105 .test_walk
= clear_refs_test_walk
,
1108 static ssize_t
clear_refs_write(struct file
*file
, const char __user
*buf
,
1109 size_t count
, loff_t
*ppos
)
1111 struct task_struct
*task
;
1112 char buffer
[PROC_NUMBUF
];
1113 struct mm_struct
*mm
;
1114 struct vm_area_struct
*vma
;
1115 enum clear_refs_types type
;
1116 struct mmu_gather tlb
;
1120 memset(buffer
, 0, sizeof(buffer
));
1121 if (count
> sizeof(buffer
) - 1)
1122 count
= sizeof(buffer
) - 1;
1123 if (copy_from_user(buffer
, buf
, count
))
1125 rv
= kstrtoint(strstrip(buffer
), 10, &itype
);
1128 type
= (enum clear_refs_types
)itype
;
1129 if (type
< CLEAR_REFS_ALL
|| type
>= CLEAR_REFS_LAST
)
1132 task
= get_proc_task(file_inode(file
));
1135 mm
= get_task_mm(task
);
1137 struct mmu_notifier_range range
;
1138 struct clear_refs_private cp
= {
1142 if (type
== CLEAR_REFS_MM_HIWATER_RSS
) {
1143 if (down_write_killable(&mm
->mmap_sem
)) {
1149 * Writing 5 to /proc/pid/clear_refs resets the peak
1150 * resident set size to this mm's current rss value.
1152 reset_mm_hiwater_rss(mm
);
1153 up_write(&mm
->mmap_sem
);
1157 if (down_read_killable(&mm
->mmap_sem
)) {
1161 tlb_gather_mmu(&tlb
, mm
, 0, -1);
1162 if (type
== CLEAR_REFS_SOFT_DIRTY
) {
1163 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
1164 if (!(vma
->vm_flags
& VM_SOFTDIRTY
))
1166 up_read(&mm
->mmap_sem
);
1167 if (down_write_killable(&mm
->mmap_sem
)) {
1172 * Avoid to modify vma->vm_flags
1173 * without locked ops while the
1174 * coredump reads the vm_flags.
1176 if (!mmget_still_valid(mm
)) {
1178 * Silently return "count"
1179 * like if get_task_mm()
1180 * failed. FIXME: should this
1181 * function have returned
1182 * -ESRCH if get_task_mm()
1184 * get_proc_task() fails?
1186 up_write(&mm
->mmap_sem
);
1189 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
1190 vma
->vm_flags
&= ~VM_SOFTDIRTY
;
1191 vma_set_page_prot(vma
);
1193 downgrade_write(&mm
->mmap_sem
);
1197 mmu_notifier_range_init(&range
, MMU_NOTIFY_SOFT_DIRTY
,
1198 0, NULL
, mm
, 0, -1UL);
1199 mmu_notifier_invalidate_range_start(&range
);
1201 walk_page_range(mm
, 0, mm
->highest_vm_end
, &clear_refs_walk_ops
,
1203 if (type
== CLEAR_REFS_SOFT_DIRTY
)
1204 mmu_notifier_invalidate_range_end(&range
);
1205 tlb_finish_mmu(&tlb
, 0, -1);
1206 up_read(&mm
->mmap_sem
);
1210 put_task_struct(task
);
1215 const struct file_operations proc_clear_refs_operations
= {
1216 .write
= clear_refs_write
,
1217 .llseek
= noop_llseek
,
1224 struct pagemapread
{
1225 int pos
, len
; /* units: PM_ENTRY_BYTES, not bytes */
1226 pagemap_entry_t
*buffer
;
1230 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1231 #define PAGEMAP_WALK_MASK (PMD_MASK)
1233 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1234 #define PM_PFRAME_BITS 55
1235 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1236 #define PM_SOFT_DIRTY BIT_ULL(55)
1237 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1238 #define PM_FILE BIT_ULL(61)
1239 #define PM_SWAP BIT_ULL(62)
1240 #define PM_PRESENT BIT_ULL(63)
1242 #define PM_END_OF_BUFFER 1
1244 static inline pagemap_entry_t
make_pme(u64 frame
, u64 flags
)
1246 return (pagemap_entry_t
) { .pme
= (frame
& PM_PFRAME_MASK
) | flags
};
1249 static int add_to_pagemap(unsigned long addr
, pagemap_entry_t
*pme
,
1250 struct pagemapread
*pm
)
1252 pm
->buffer
[pm
->pos
++] = *pme
;
1253 if (pm
->pos
>= pm
->len
)
1254 return PM_END_OF_BUFFER
;
1258 static int pagemap_pte_hole(unsigned long start
, unsigned long end
,
1259 __always_unused
int depth
, struct mm_walk
*walk
)
1261 struct pagemapread
*pm
= walk
->private;
1262 unsigned long addr
= start
;
1265 while (addr
< end
) {
1266 struct vm_area_struct
*vma
= find_vma(walk
->mm
, addr
);
1267 pagemap_entry_t pme
= make_pme(0, 0);
1268 /* End of address space hole, which we mark as non-present. */
1269 unsigned long hole_end
;
1272 hole_end
= min(end
, vma
->vm_start
);
1276 for (; addr
< hole_end
; addr
+= PAGE_SIZE
) {
1277 err
= add_to_pagemap(addr
, &pme
, pm
);
1285 /* Addresses in the VMA. */
1286 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1287 pme
= make_pme(0, PM_SOFT_DIRTY
);
1288 for (; addr
< min(end
, vma
->vm_end
); addr
+= PAGE_SIZE
) {
1289 err
= add_to_pagemap(addr
, &pme
, pm
);
1298 static pagemap_entry_t
pte_to_pagemap_entry(struct pagemapread
*pm
,
1299 struct vm_area_struct
*vma
, unsigned long addr
, pte_t pte
)
1301 u64 frame
= 0, flags
= 0;
1302 struct page
*page
= NULL
;
1304 if (pte_present(pte
)) {
1306 frame
= pte_pfn(pte
);
1307 flags
|= PM_PRESENT
;
1308 page
= vm_normal_page(vma
, addr
, pte
);
1309 if (pte_soft_dirty(pte
))
1310 flags
|= PM_SOFT_DIRTY
;
1311 } else if (is_swap_pte(pte
)) {
1313 if (pte_swp_soft_dirty(pte
))
1314 flags
|= PM_SOFT_DIRTY
;
1315 entry
= pte_to_swp_entry(pte
);
1317 frame
= swp_type(entry
) |
1318 (swp_offset(entry
) << MAX_SWAPFILES_SHIFT
);
1320 if (is_migration_entry(entry
))
1321 page
= migration_entry_to_page(entry
);
1323 if (is_device_private_entry(entry
))
1324 page
= device_private_entry_to_page(entry
);
1327 if (page
&& !PageAnon(page
))
1329 if (page
&& page_mapcount(page
) == 1)
1330 flags
|= PM_MMAP_EXCLUSIVE
;
1331 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1332 flags
|= PM_SOFT_DIRTY
;
1334 return make_pme(frame
, flags
);
1337 static int pagemap_pmd_range(pmd_t
*pmdp
, unsigned long addr
, unsigned long end
,
1338 struct mm_walk
*walk
)
1340 struct vm_area_struct
*vma
= walk
->vma
;
1341 struct pagemapread
*pm
= walk
->private;
1343 pte_t
*pte
, *orig_pte
;
1346 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1347 ptl
= pmd_trans_huge_lock(pmdp
, vma
);
1349 u64 flags
= 0, frame
= 0;
1351 struct page
*page
= NULL
;
1353 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1354 flags
|= PM_SOFT_DIRTY
;
1356 if (pmd_present(pmd
)) {
1357 page
= pmd_page(pmd
);
1359 flags
|= PM_PRESENT
;
1360 if (pmd_soft_dirty(pmd
))
1361 flags
|= PM_SOFT_DIRTY
;
1363 frame
= pmd_pfn(pmd
) +
1364 ((addr
& ~PMD_MASK
) >> PAGE_SHIFT
);
1366 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1367 else if (is_swap_pmd(pmd
)) {
1368 swp_entry_t entry
= pmd_to_swp_entry(pmd
);
1369 unsigned long offset
;
1372 offset
= swp_offset(entry
) +
1373 ((addr
& ~PMD_MASK
) >> PAGE_SHIFT
);
1374 frame
= swp_type(entry
) |
1375 (offset
<< MAX_SWAPFILES_SHIFT
);
1378 if (pmd_swp_soft_dirty(pmd
))
1379 flags
|= PM_SOFT_DIRTY
;
1380 VM_BUG_ON(!is_pmd_migration_entry(pmd
));
1381 page
= migration_entry_to_page(entry
);
1385 if (page
&& page_mapcount(page
) == 1)
1386 flags
|= PM_MMAP_EXCLUSIVE
;
1388 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
1389 pagemap_entry_t pme
= make_pme(frame
, flags
);
1391 err
= add_to_pagemap(addr
, &pme
, pm
);
1395 if (flags
& PM_PRESENT
)
1397 else if (flags
& PM_SWAP
)
1398 frame
+= (1 << MAX_SWAPFILES_SHIFT
);
1405 if (pmd_trans_unstable(pmdp
))
1407 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1410 * We can assume that @vma always points to a valid one and @end never
1411 * goes beyond vma->vm_end.
1413 orig_pte
= pte
= pte_offset_map_lock(walk
->mm
, pmdp
, addr
, &ptl
);
1414 for (; addr
< end
; pte
++, addr
+= PAGE_SIZE
) {
1415 pagemap_entry_t pme
;
1417 pme
= pte_to_pagemap_entry(pm
, vma
, addr
, *pte
);
1418 err
= add_to_pagemap(addr
, &pme
, pm
);
1422 pte_unmap_unlock(orig_pte
, ptl
);
1429 #ifdef CONFIG_HUGETLB_PAGE
1430 /* This function walks within one hugetlb entry in the single call */
1431 static int pagemap_hugetlb_range(pte_t
*ptep
, unsigned long hmask
,
1432 unsigned long addr
, unsigned long end
,
1433 struct mm_walk
*walk
)
1435 struct pagemapread
*pm
= walk
->private;
1436 struct vm_area_struct
*vma
= walk
->vma
;
1437 u64 flags
= 0, frame
= 0;
1441 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1442 flags
|= PM_SOFT_DIRTY
;
1444 pte
= huge_ptep_get(ptep
);
1445 if (pte_present(pte
)) {
1446 struct page
*page
= pte_page(pte
);
1448 if (!PageAnon(page
))
1451 if (page_mapcount(page
) == 1)
1452 flags
|= PM_MMAP_EXCLUSIVE
;
1454 flags
|= PM_PRESENT
;
1456 frame
= pte_pfn(pte
) +
1457 ((addr
& ~hmask
) >> PAGE_SHIFT
);
1460 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
1461 pagemap_entry_t pme
= make_pme(frame
, flags
);
1463 err
= add_to_pagemap(addr
, &pme
, pm
);
1466 if (pm
->show_pfn
&& (flags
& PM_PRESENT
))
1475 #define pagemap_hugetlb_range NULL
1476 #endif /* HUGETLB_PAGE */
1478 static const struct mm_walk_ops pagemap_ops
= {
1479 .pmd_entry
= pagemap_pmd_range
,
1480 .pte_hole
= pagemap_pte_hole
,
1481 .hugetlb_entry
= pagemap_hugetlb_range
,
1485 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1487 * For each page in the address space, this file contains one 64-bit entry
1488 * consisting of the following:
1490 * Bits 0-54 page frame number (PFN) if present
1491 * Bits 0-4 swap type if swapped
1492 * Bits 5-54 swap offset if swapped
1493 * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst)
1494 * Bit 56 page exclusively mapped
1496 * Bit 61 page is file-page or shared-anon
1497 * Bit 62 page swapped
1498 * Bit 63 page present
1500 * If the page is not present but in swap, then the PFN contains an
1501 * encoding of the swap file number and the page's offset into the
1502 * swap. Unmapped pages return a null PFN. This allows determining
1503 * precisely which pages are mapped (or in swap) and comparing mapped
1504 * pages between processes.
1506 * Efficient users of this interface will use /proc/pid/maps to
1507 * determine which areas of memory are actually mapped and llseek to
1508 * skip over unmapped regions.
1510 static ssize_t
pagemap_read(struct file
*file
, char __user
*buf
,
1511 size_t count
, loff_t
*ppos
)
1513 struct mm_struct
*mm
= file
->private_data
;
1514 struct pagemapread pm
;
1516 unsigned long svpfn
;
1517 unsigned long start_vaddr
;
1518 unsigned long end_vaddr
;
1519 int ret
= 0, copied
= 0;
1521 if (!mm
|| !mmget_not_zero(mm
))
1525 /* file position must be aligned */
1526 if ((*ppos
% PM_ENTRY_BYTES
) || (count
% PM_ENTRY_BYTES
))
1533 /* do not disclose physical addresses: attack vector */
1534 pm
.show_pfn
= file_ns_capable(file
, &init_user_ns
, CAP_SYS_ADMIN
);
1536 pm
.len
= (PAGEMAP_WALK_SIZE
>> PAGE_SHIFT
);
1537 pm
.buffer
= kmalloc_array(pm
.len
, PM_ENTRY_BYTES
, GFP_KERNEL
);
1543 svpfn
= src
/ PM_ENTRY_BYTES
;
1544 start_vaddr
= svpfn
<< PAGE_SHIFT
;
1545 end_vaddr
= mm
->task_size
;
1547 /* watch out for wraparound */
1548 if (svpfn
> mm
->task_size
>> PAGE_SHIFT
)
1549 start_vaddr
= end_vaddr
;
1552 * The odds are that this will stop walking way
1553 * before end_vaddr, because the length of the
1554 * user buffer is tracked in "pm", and the walk
1555 * will stop when we hit the end of the buffer.
1558 while (count
&& (start_vaddr
< end_vaddr
)) {
1563 end
= (start_vaddr
+ PAGEMAP_WALK_SIZE
) & PAGEMAP_WALK_MASK
;
1565 if (end
< start_vaddr
|| end
> end_vaddr
)
1567 ret
= down_read_killable(&mm
->mmap_sem
);
1570 ret
= walk_page_range(mm
, start_vaddr
, end
, &pagemap_ops
, &pm
);
1571 up_read(&mm
->mmap_sem
);
1574 len
= min(count
, PM_ENTRY_BYTES
* pm
.pos
);
1575 if (copy_to_user(buf
, pm
.buffer
, len
)) {
1584 if (!ret
|| ret
== PM_END_OF_BUFFER
)
1595 static int pagemap_open(struct inode
*inode
, struct file
*file
)
1597 struct mm_struct
*mm
;
1599 mm
= proc_mem_open(inode
, PTRACE_MODE_READ
);
1602 file
->private_data
= mm
;
1606 static int pagemap_release(struct inode
*inode
, struct file
*file
)
1608 struct mm_struct
*mm
= file
->private_data
;
1615 const struct file_operations proc_pagemap_operations
= {
1616 .llseek
= mem_lseek
, /* borrow this */
1617 .read
= pagemap_read
,
1618 .open
= pagemap_open
,
1619 .release
= pagemap_release
,
1621 #endif /* CONFIG_PROC_PAGE_MONITOR */
1626 unsigned long pages
;
1628 unsigned long active
;
1629 unsigned long writeback
;
1630 unsigned long mapcount_max
;
1631 unsigned long dirty
;
1632 unsigned long swapcache
;
1633 unsigned long node
[MAX_NUMNODES
];
1636 struct numa_maps_private
{
1637 struct proc_maps_private proc_maps
;
1638 struct numa_maps md
;
1641 static void gather_stats(struct page
*page
, struct numa_maps
*md
, int pte_dirty
,
1642 unsigned long nr_pages
)
1644 int count
= page_mapcount(page
);
1646 md
->pages
+= nr_pages
;
1647 if (pte_dirty
|| PageDirty(page
))
1648 md
->dirty
+= nr_pages
;
1650 if (PageSwapCache(page
))
1651 md
->swapcache
+= nr_pages
;
1653 if (PageActive(page
) || PageUnevictable(page
))
1654 md
->active
+= nr_pages
;
1656 if (PageWriteback(page
))
1657 md
->writeback
+= nr_pages
;
1660 md
->anon
+= nr_pages
;
1662 if (count
> md
->mapcount_max
)
1663 md
->mapcount_max
= count
;
1665 md
->node
[page_to_nid(page
)] += nr_pages
;
1668 static struct page
*can_gather_numa_stats(pte_t pte
, struct vm_area_struct
*vma
,
1674 if (!pte_present(pte
))
1677 page
= vm_normal_page(vma
, addr
, pte
);
1681 if (PageReserved(page
))
1684 nid
= page_to_nid(page
);
1685 if (!node_isset(nid
, node_states
[N_MEMORY
]))
1691 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1692 static struct page
*can_gather_numa_stats_pmd(pmd_t pmd
,
1693 struct vm_area_struct
*vma
,
1699 if (!pmd_present(pmd
))
1702 page
= vm_normal_page_pmd(vma
, addr
, pmd
);
1706 if (PageReserved(page
))
1709 nid
= page_to_nid(page
);
1710 if (!node_isset(nid
, node_states
[N_MEMORY
]))
1717 static int gather_pte_stats(pmd_t
*pmd
, unsigned long addr
,
1718 unsigned long end
, struct mm_walk
*walk
)
1720 struct numa_maps
*md
= walk
->private;
1721 struct vm_area_struct
*vma
= walk
->vma
;
1726 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1727 ptl
= pmd_trans_huge_lock(pmd
, vma
);
1731 page
= can_gather_numa_stats_pmd(*pmd
, vma
, addr
);
1733 gather_stats(page
, md
, pmd_dirty(*pmd
),
1734 HPAGE_PMD_SIZE
/PAGE_SIZE
);
1739 if (pmd_trans_unstable(pmd
))
1742 orig_pte
= pte
= pte_offset_map_lock(walk
->mm
, pmd
, addr
, &ptl
);
1744 struct page
*page
= can_gather_numa_stats(*pte
, vma
, addr
);
1747 gather_stats(page
, md
, pte_dirty(*pte
), 1);
1749 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
1750 pte_unmap_unlock(orig_pte
, ptl
);
1754 #ifdef CONFIG_HUGETLB_PAGE
1755 static int gather_hugetlb_stats(pte_t
*pte
, unsigned long hmask
,
1756 unsigned long addr
, unsigned long end
, struct mm_walk
*walk
)
1758 pte_t huge_pte
= huge_ptep_get(pte
);
1759 struct numa_maps
*md
;
1762 if (!pte_present(huge_pte
))
1765 page
= pte_page(huge_pte
);
1770 gather_stats(page
, md
, pte_dirty(huge_pte
), 1);
1775 static int gather_hugetlb_stats(pte_t
*pte
, unsigned long hmask
,
1776 unsigned long addr
, unsigned long end
, struct mm_walk
*walk
)
1782 static const struct mm_walk_ops show_numa_ops
= {
1783 .hugetlb_entry
= gather_hugetlb_stats
,
1784 .pmd_entry
= gather_pte_stats
,
1788 * Display pages allocated per node and memory policy via /proc.
1790 static int show_numa_map(struct seq_file
*m
, void *v
)
1792 struct numa_maps_private
*numa_priv
= m
->private;
1793 struct proc_maps_private
*proc_priv
= &numa_priv
->proc_maps
;
1794 struct vm_area_struct
*vma
= v
;
1795 struct numa_maps
*md
= &numa_priv
->md
;
1796 struct file
*file
= vma
->vm_file
;
1797 struct mm_struct
*mm
= vma
->vm_mm
;
1798 struct mempolicy
*pol
;
1805 /* Ensure we start with an empty set of numa_maps statistics. */
1806 memset(md
, 0, sizeof(*md
));
1808 pol
= __get_vma_policy(vma
, vma
->vm_start
);
1810 mpol_to_str(buffer
, sizeof(buffer
), pol
);
1813 mpol_to_str(buffer
, sizeof(buffer
), proc_priv
->task_mempolicy
);
1816 seq_printf(m
, "%08lx %s", vma
->vm_start
, buffer
);
1819 seq_puts(m
, " file=");
1820 seq_file_path(m
, file
, "\n\t= ");
1821 } else if (vma
->vm_start
<= mm
->brk
&& vma
->vm_end
>= mm
->start_brk
) {
1822 seq_puts(m
, " heap");
1823 } else if (is_stack(vma
)) {
1824 seq_puts(m
, " stack");
1827 if (is_vm_hugetlb_page(vma
))
1828 seq_puts(m
, " huge");
1830 /* mmap_sem is held by m_start */
1831 walk_page_vma(vma
, &show_numa_ops
, md
);
1837 seq_printf(m
, " anon=%lu", md
->anon
);
1840 seq_printf(m
, " dirty=%lu", md
->dirty
);
1842 if (md
->pages
!= md
->anon
&& md
->pages
!= md
->dirty
)
1843 seq_printf(m
, " mapped=%lu", md
->pages
);
1845 if (md
->mapcount_max
> 1)
1846 seq_printf(m
, " mapmax=%lu", md
->mapcount_max
);
1849 seq_printf(m
, " swapcache=%lu", md
->swapcache
);
1851 if (md
->active
< md
->pages
&& !is_vm_hugetlb_page(vma
))
1852 seq_printf(m
, " active=%lu", md
->active
);
1855 seq_printf(m
, " writeback=%lu", md
->writeback
);
1857 for_each_node_state(nid
, N_MEMORY
)
1859 seq_printf(m
, " N%d=%lu", nid
, md
->node
[nid
]);
1861 seq_printf(m
, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma
) >> 10);
1867 static const struct seq_operations proc_pid_numa_maps_op
= {
1871 .show
= show_numa_map
,
1874 static int pid_numa_maps_open(struct inode
*inode
, struct file
*file
)
1876 return proc_maps_open(inode
, file
, &proc_pid_numa_maps_op
,
1877 sizeof(struct numa_maps_private
));
1880 const struct file_operations proc_pid_numa_maps_operations
= {
1881 .open
= pid_numa_maps_open
,
1883 .llseek
= seq_lseek
,
1884 .release
= proc_map_release
,
1887 #endif /* CONFIG_NUMA */