1 // SPDX-License-Identifier: GPL-2.0
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 vma_stop(struct proc_maps_private
*priv
)
128 struct mm_struct
*mm
= priv
->mm
;
130 release_task_mempolicy(priv
);
131 up_read(&mm
->mmap_sem
);
135 static struct vm_area_struct
*
136 m_next_vma(struct proc_maps_private
*priv
, struct vm_area_struct
*vma
)
138 if (vma
== priv
->tail_vma
)
140 return vma
->vm_next
?: priv
->tail_vma
;
143 static void m_cache_vma(struct seq_file
*m
, struct vm_area_struct
*vma
)
145 if (m
->count
< m
->size
) /* vma is copied successfully */
146 m
->version
= m_next_vma(m
->private, vma
) ? vma
->vm_end
: -1UL;
149 static void *m_start(struct seq_file
*m
, loff_t
*ppos
)
151 struct proc_maps_private
*priv
= m
->private;
152 unsigned long last_addr
= m
->version
;
153 struct mm_struct
*mm
;
154 struct vm_area_struct
*vma
;
155 unsigned int pos
= *ppos
;
157 /* See m_cache_vma(). Zero at the start or after lseek. */
158 if (last_addr
== -1UL)
161 priv
->task
= get_proc_task(priv
->inode
);
163 return ERR_PTR(-ESRCH
);
166 if (!mm
|| !mmget_not_zero(mm
))
169 if (down_read_killable(&mm
->mmap_sem
)) {
171 return ERR_PTR(-EINTR
);
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 vm_area_struct
*vma
)
271 * We make no effort to guess what a given thread considers to be
272 * its "stack". It's not even well-defined for programs written
275 return vma
->vm_start
<= vma
->vm_mm
->start_stack
&&
276 vma
->vm_end
>= vma
->vm_mm
->start_stack
;
279 static void show_vma_header_prefix(struct seq_file
*m
,
280 unsigned long start
, unsigned long end
,
281 vm_flags_t flags
, unsigned long long pgoff
,
282 dev_t dev
, unsigned long ino
)
284 seq_setwidth(m
, 25 + sizeof(void *) * 6 - 1);
285 seq_put_hex_ll(m
, NULL
, start
, 8);
286 seq_put_hex_ll(m
, "-", end
, 8);
288 seq_putc(m
, flags
& VM_READ
? 'r' : '-');
289 seq_putc(m
, flags
& VM_WRITE
? 'w' : '-');
290 seq_putc(m
, flags
& VM_EXEC
? 'x' : '-');
291 seq_putc(m
, flags
& VM_MAYSHARE
? 's' : 'p');
292 seq_put_hex_ll(m
, " ", pgoff
, 8);
293 seq_put_hex_ll(m
, " ", MAJOR(dev
), 2);
294 seq_put_hex_ll(m
, ":", MINOR(dev
), 2);
295 seq_put_decimal_ull(m
, " ", ino
);
300 show_map_vma(struct seq_file
*m
, struct vm_area_struct
*vma
)
302 struct mm_struct
*mm
= vma
->vm_mm
;
303 struct file
*file
= vma
->vm_file
;
304 vm_flags_t flags
= vma
->vm_flags
;
305 unsigned long ino
= 0;
306 unsigned long long pgoff
= 0;
307 unsigned long start
, end
;
309 const char *name
= NULL
;
312 struct inode
*inode
= file_inode(vma
->vm_file
);
313 dev
= inode
->i_sb
->s_dev
;
315 pgoff
= ((loff_t
)vma
->vm_pgoff
) << PAGE_SHIFT
;
318 start
= vma
->vm_start
;
320 show_vma_header_prefix(m
, start
, end
, flags
, pgoff
, dev
, ino
);
323 * Print the dentry name for named mappings, and a
324 * special [heap] marker for the heap:
328 seq_file_path(m
, file
, "\n");
332 if (vma
->vm_ops
&& vma
->vm_ops
->name
) {
333 name
= vma
->vm_ops
->name(vma
);
338 name
= arch_vma_name(vma
);
345 if (vma
->vm_start
<= mm
->brk
&&
346 vma
->vm_end
>= mm
->start_brk
) {
363 static int show_map(struct seq_file
*m
, void *v
)
370 static const struct seq_operations proc_pid_maps_op
= {
377 static int pid_maps_open(struct inode
*inode
, struct file
*file
)
379 return do_maps_open(inode
, file
, &proc_pid_maps_op
);
382 const struct file_operations proc_pid_maps_operations
= {
383 .open
= pid_maps_open
,
386 .release
= proc_map_release
,
390 * Proportional Set Size(PSS): my share of RSS.
392 * PSS of a process is the count of pages it has in memory, where each
393 * page is divided by the number of processes sharing it. So if a
394 * process has 1000 pages all to itself, and 1000 shared with one other
395 * process, its PSS will be 1500.
397 * To keep (accumulated) division errors low, we adopt a 64bit
398 * fixed-point pss counter to minimize division errors. So (pss >>
399 * PSS_SHIFT) would be the real byte count.
401 * A shift of 12 before division means (assuming 4K page size):
402 * - 1M 3-user-pages add up to 8KB errors;
403 * - supports mapcount up to 2^24, or 16M;
404 * - supports PSS up to 2^52 bytes, or 4PB.
408 #ifdef CONFIG_PROC_PAGE_MONITOR
409 struct mem_size_stats
{
410 unsigned long resident
;
411 unsigned long shared_clean
;
412 unsigned long shared_dirty
;
413 unsigned long private_clean
;
414 unsigned long private_dirty
;
415 unsigned long referenced
;
416 unsigned long anonymous
;
417 unsigned long lazyfree
;
418 unsigned long anonymous_thp
;
419 unsigned long shmem_thp
;
421 unsigned long shared_hugetlb
;
422 unsigned long private_hugetlb
;
429 bool check_shmem_swap
;
432 static void smaps_page_accumulate(struct mem_size_stats
*mss
,
433 struct page
*page
, unsigned long size
, unsigned long pss
,
434 bool dirty
, bool locked
, bool private)
439 mss
->pss_anon
+= pss
;
440 else if (PageSwapBacked(page
))
441 mss
->pss_shmem
+= pss
;
443 mss
->pss_file
+= pss
;
446 mss
->pss_locked
+= pss
;
448 if (dirty
|| PageDirty(page
)) {
450 mss
->private_dirty
+= size
;
452 mss
->shared_dirty
+= size
;
455 mss
->private_clean
+= size
;
457 mss
->shared_clean
+= size
;
461 static void smaps_account(struct mem_size_stats
*mss
, struct page
*page
,
462 bool compound
, bool young
, bool dirty
, bool locked
)
464 int i
, nr
= compound
? 1 << compound_order(page
) : 1;
465 unsigned long size
= nr
* PAGE_SIZE
;
468 * First accumulate quantities that depend only on |size| and the type
469 * of the compound page.
471 if (PageAnon(page
)) {
472 mss
->anonymous
+= size
;
473 if (!PageSwapBacked(page
) && !dirty
&& !PageDirty(page
))
474 mss
->lazyfree
+= size
;
477 mss
->resident
+= size
;
478 /* Accumulate the size in pages that have been accessed. */
479 if (young
|| page_is_young(page
) || PageReferenced(page
))
480 mss
->referenced
+= size
;
483 * Then accumulate quantities that may depend on sharing, or that may
484 * differ page-by-page.
486 * page_count(page) == 1 guarantees the page is mapped exactly once.
487 * If any subpage of the compound page mapped with PTE it would elevate
490 if (page_count(page
) == 1) {
491 smaps_page_accumulate(mss
, page
, size
, size
<< PSS_SHIFT
, dirty
,
495 for (i
= 0; i
< nr
; i
++, page
++) {
496 int mapcount
= page_mapcount(page
);
497 unsigned long pss
= PAGE_SIZE
<< PSS_SHIFT
;
500 smaps_page_accumulate(mss
, page
, PAGE_SIZE
, pss
, dirty
, locked
,
506 static int smaps_pte_hole(unsigned long addr
, unsigned long end
,
507 struct mm_walk
*walk
)
509 struct mem_size_stats
*mss
= walk
->private;
511 mss
->swap
+= shmem_partial_swap_usage(
512 walk
->vma
->vm_file
->f_mapping
, addr
, end
);
518 static void smaps_pte_entry(pte_t
*pte
, unsigned long addr
,
519 struct mm_walk
*walk
)
521 struct mem_size_stats
*mss
= walk
->private;
522 struct vm_area_struct
*vma
= walk
->vma
;
523 bool locked
= !!(vma
->vm_flags
& VM_LOCKED
);
524 struct page
*page
= NULL
;
526 if (pte_present(*pte
)) {
527 page
= vm_normal_page(vma
, addr
, *pte
);
528 } else if (is_swap_pte(*pte
)) {
529 swp_entry_t swpent
= pte_to_swp_entry(*pte
);
531 if (!non_swap_entry(swpent
)) {
534 mss
->swap
+= PAGE_SIZE
;
535 mapcount
= swp_swapcount(swpent
);
537 u64 pss_delta
= (u64
)PAGE_SIZE
<< PSS_SHIFT
;
539 do_div(pss_delta
, mapcount
);
540 mss
->swap_pss
+= pss_delta
;
542 mss
->swap_pss
+= (u64
)PAGE_SIZE
<< PSS_SHIFT
;
544 } else if (is_migration_entry(swpent
))
545 page
= migration_entry_to_page(swpent
);
546 else if (is_device_private_entry(swpent
))
547 page
= device_private_entry_to_page(swpent
);
548 } else if (unlikely(IS_ENABLED(CONFIG_SHMEM
) && mss
->check_shmem_swap
549 && pte_none(*pte
))) {
550 page
= find_get_entry(vma
->vm_file
->f_mapping
,
551 linear_page_index(vma
, addr
));
555 if (xa_is_value(page
))
556 mss
->swap
+= PAGE_SIZE
;
566 smaps_account(mss
, page
, false, pte_young(*pte
), pte_dirty(*pte
), locked
);
569 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
570 static void smaps_pmd_entry(pmd_t
*pmd
, unsigned long addr
,
571 struct mm_walk
*walk
)
573 struct mem_size_stats
*mss
= walk
->private;
574 struct vm_area_struct
*vma
= walk
->vma
;
575 bool locked
= !!(vma
->vm_flags
& VM_LOCKED
);
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
), locked
);
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 if (pmd_present(*pmd
))
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
);
630 static void show_smap_vma_flags(struct seq_file
*m
, struct vm_area_struct
*vma
)
633 * Don't forget to update Documentation/ on changes.
635 static const char mnemonics
[BITS_PER_LONG
][2] = {
637 * In case if we meet a flag we don't know about.
639 [0 ... (BITS_PER_LONG
-1)] = "??",
641 [ilog2(VM_READ
)] = "rd",
642 [ilog2(VM_WRITE
)] = "wr",
643 [ilog2(VM_EXEC
)] = "ex",
644 [ilog2(VM_SHARED
)] = "sh",
645 [ilog2(VM_MAYREAD
)] = "mr",
646 [ilog2(VM_MAYWRITE
)] = "mw",
647 [ilog2(VM_MAYEXEC
)] = "me",
648 [ilog2(VM_MAYSHARE
)] = "ms",
649 [ilog2(VM_GROWSDOWN
)] = "gd",
650 [ilog2(VM_PFNMAP
)] = "pf",
651 [ilog2(VM_DENYWRITE
)] = "dw",
652 #ifdef CONFIG_X86_INTEL_MPX
653 [ilog2(VM_MPX
)] = "mp",
655 [ilog2(VM_LOCKED
)] = "lo",
656 [ilog2(VM_IO
)] = "io",
657 [ilog2(VM_SEQ_READ
)] = "sr",
658 [ilog2(VM_RAND_READ
)] = "rr",
659 [ilog2(VM_DONTCOPY
)] = "dc",
660 [ilog2(VM_DONTEXPAND
)] = "de",
661 [ilog2(VM_ACCOUNT
)] = "ac",
662 [ilog2(VM_NORESERVE
)] = "nr",
663 [ilog2(VM_HUGETLB
)] = "ht",
664 [ilog2(VM_SYNC
)] = "sf",
665 [ilog2(VM_ARCH_1
)] = "ar",
666 [ilog2(VM_WIPEONFORK
)] = "wf",
667 [ilog2(VM_DONTDUMP
)] = "dd",
668 #ifdef CONFIG_MEM_SOFT_DIRTY
669 [ilog2(VM_SOFTDIRTY
)] = "sd",
671 [ilog2(VM_MIXEDMAP
)] = "mm",
672 [ilog2(VM_HUGEPAGE
)] = "hg",
673 [ilog2(VM_NOHUGEPAGE
)] = "nh",
674 [ilog2(VM_MERGEABLE
)] = "mg",
675 [ilog2(VM_UFFD_MISSING
)]= "um",
676 [ilog2(VM_UFFD_WP
)] = "uw",
677 #ifdef CONFIG_ARCH_HAS_PKEYS
678 /* These come out via ProtectionKey: */
679 [ilog2(VM_PKEY_BIT0
)] = "",
680 [ilog2(VM_PKEY_BIT1
)] = "",
681 [ilog2(VM_PKEY_BIT2
)] = "",
682 [ilog2(VM_PKEY_BIT3
)] = "",
684 [ilog2(VM_PKEY_BIT4
)] = "",
686 #endif /* CONFIG_ARCH_HAS_PKEYS */
690 seq_puts(m
, "VmFlags: ");
691 for (i
= 0; i
< BITS_PER_LONG
; i
++) {
692 if (!mnemonics
[i
][0])
694 if (vma
->vm_flags
& (1UL << i
)) {
695 seq_putc(m
, mnemonics
[i
][0]);
696 seq_putc(m
, mnemonics
[i
][1]);
703 #ifdef CONFIG_HUGETLB_PAGE
704 static int smaps_hugetlb_range(pte_t
*pte
, unsigned long hmask
,
705 unsigned long addr
, unsigned long end
,
706 struct mm_walk
*walk
)
708 struct mem_size_stats
*mss
= walk
->private;
709 struct vm_area_struct
*vma
= walk
->vma
;
710 struct page
*page
= NULL
;
712 if (pte_present(*pte
)) {
713 page
= vm_normal_page(vma
, addr
, *pte
);
714 } else if (is_swap_pte(*pte
)) {
715 swp_entry_t swpent
= pte_to_swp_entry(*pte
);
717 if (is_migration_entry(swpent
))
718 page
= migration_entry_to_page(swpent
);
719 else if (is_device_private_entry(swpent
))
720 page
= device_private_entry_to_page(swpent
);
723 int mapcount
= page_mapcount(page
);
726 mss
->shared_hugetlb
+= huge_page_size(hstate_vma(vma
));
728 mss
->private_hugetlb
+= huge_page_size(hstate_vma(vma
));
732 #endif /* HUGETLB_PAGE */
734 static void smap_gather_stats(struct vm_area_struct
*vma
,
735 struct mem_size_stats
*mss
)
737 struct mm_walk smaps_walk
= {
738 .pmd_entry
= smaps_pte_range
,
739 #ifdef CONFIG_HUGETLB_PAGE
740 .hugetlb_entry
= smaps_hugetlb_range
,
745 smaps_walk
.private = mss
;
748 /* In case of smaps_rollup, reset the value from previous vma */
749 mss
->check_shmem_swap
= false;
750 if (vma
->vm_file
&& shmem_mapping(vma
->vm_file
->f_mapping
)) {
752 * For shared or readonly shmem mappings we know that all
753 * swapped out pages belong to the shmem object, and we can
754 * obtain the swap value much more efficiently. For private
755 * writable mappings, we might have COW pages that are
756 * not affected by the parent swapped out pages of the shmem
757 * object, so we have to distinguish them during the page walk.
758 * Unless we know that the shmem object (or the part mapped by
759 * our VMA) has no swapped out pages at all.
761 unsigned long shmem_swapped
= shmem_swap_usage(vma
);
763 if (!shmem_swapped
|| (vma
->vm_flags
& VM_SHARED
) ||
764 !(vma
->vm_flags
& VM_WRITE
)) {
765 mss
->swap
+= shmem_swapped
;
767 mss
->check_shmem_swap
= true;
768 smaps_walk
.pte_hole
= smaps_pte_hole
;
772 /* mmap_sem is held in m_start */
773 walk_page_vma(vma
, &smaps_walk
);
776 #define SEQ_PUT_DEC(str, val) \
777 seq_put_decimal_ull_width(m, str, (val) >> 10, 8)
779 /* Show the contents common for smaps and smaps_rollup */
780 static void __show_smap(struct seq_file
*m
, const struct mem_size_stats
*mss
,
783 SEQ_PUT_DEC("Rss: ", mss
->resident
);
784 SEQ_PUT_DEC(" kB\nPss: ", mss
->pss
>> PSS_SHIFT
);
787 * These are meaningful only for smaps_rollup, otherwise two of
788 * them are zero, and the other one is the same as Pss.
790 SEQ_PUT_DEC(" kB\nPss_Anon: ",
791 mss
->pss_anon
>> PSS_SHIFT
);
792 SEQ_PUT_DEC(" kB\nPss_File: ",
793 mss
->pss_file
>> PSS_SHIFT
);
794 SEQ_PUT_DEC(" kB\nPss_Shmem: ",
795 mss
->pss_shmem
>> PSS_SHIFT
);
797 SEQ_PUT_DEC(" kB\nShared_Clean: ", mss
->shared_clean
);
798 SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss
->shared_dirty
);
799 SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss
->private_clean
);
800 SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss
->private_dirty
);
801 SEQ_PUT_DEC(" kB\nReferenced: ", mss
->referenced
);
802 SEQ_PUT_DEC(" kB\nAnonymous: ", mss
->anonymous
);
803 SEQ_PUT_DEC(" kB\nLazyFree: ", mss
->lazyfree
);
804 SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss
->anonymous_thp
);
805 SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss
->shmem_thp
);
806 SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss
->shared_hugetlb
);
807 seq_put_decimal_ull_width(m
, " kB\nPrivate_Hugetlb: ",
808 mss
->private_hugetlb
>> 10, 7);
809 SEQ_PUT_DEC(" kB\nSwap: ", mss
->swap
);
810 SEQ_PUT_DEC(" kB\nSwapPss: ",
811 mss
->swap_pss
>> PSS_SHIFT
);
812 SEQ_PUT_DEC(" kB\nLocked: ",
813 mss
->pss_locked
>> PSS_SHIFT
);
814 seq_puts(m
, " kB\n");
817 static int show_smap(struct seq_file
*m
, void *v
)
819 struct vm_area_struct
*vma
= v
;
820 struct mem_size_stats mss
;
822 memset(&mss
, 0, sizeof(mss
));
824 smap_gather_stats(vma
, &mss
);
826 show_map_vma(m
, vma
);
828 SEQ_PUT_DEC("Size: ", vma
->vm_end
- vma
->vm_start
);
829 SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma
));
830 SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma
));
831 seq_puts(m
, " kB\n");
833 __show_smap(m
, &mss
, false);
835 seq_printf(m
, "THPeligible: %d\n", transparent_hugepage_enabled(vma
));
837 if (arch_pkeys_enabled())
838 seq_printf(m
, "ProtectionKey: %8u\n", vma_pkey(vma
));
839 show_smap_vma_flags(m
, vma
);
846 static int show_smaps_rollup(struct seq_file
*m
, void *v
)
848 struct proc_maps_private
*priv
= m
->private;
849 struct mem_size_stats mss
;
850 struct mm_struct
*mm
;
851 struct vm_area_struct
*vma
;
852 unsigned long last_vma_end
= 0;
855 priv
->task
= get_proc_task(priv
->inode
);
860 if (!mm
|| !mmget_not_zero(mm
)) {
865 memset(&mss
, 0, sizeof(mss
));
867 ret
= down_read_killable(&mm
->mmap_sem
);
871 hold_task_mempolicy(priv
);
873 for (vma
= priv
->mm
->mmap
; vma
; vma
= vma
->vm_next
) {
874 smap_gather_stats(vma
, &mss
);
875 last_vma_end
= vma
->vm_end
;
878 show_vma_header_prefix(m
, priv
->mm
->mmap
->vm_start
,
879 last_vma_end
, 0, 0, 0, 0);
881 seq_puts(m
, "[rollup]\n");
883 __show_smap(m
, &mss
, true);
885 release_task_mempolicy(priv
);
886 up_read(&mm
->mmap_sem
);
891 put_task_struct(priv
->task
);
898 static const struct seq_operations proc_pid_smaps_op
= {
905 static int pid_smaps_open(struct inode
*inode
, struct file
*file
)
907 return do_maps_open(inode
, file
, &proc_pid_smaps_op
);
910 static int smaps_rollup_open(struct inode
*inode
, struct file
*file
)
913 struct proc_maps_private
*priv
;
915 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL_ACCOUNT
);
919 ret
= single_open(file
, show_smaps_rollup
, priv
);
924 priv
->mm
= proc_mem_open(inode
, PTRACE_MODE_READ
);
925 if (IS_ERR(priv
->mm
)) {
926 ret
= PTR_ERR(priv
->mm
);
928 single_release(inode
, file
);
939 static int smaps_rollup_release(struct inode
*inode
, struct file
*file
)
941 struct seq_file
*seq
= file
->private_data
;
942 struct proc_maps_private
*priv
= seq
->private;
948 return single_release(inode
, file
);
951 const struct file_operations proc_pid_smaps_operations
= {
952 .open
= pid_smaps_open
,
955 .release
= proc_map_release
,
958 const struct file_operations proc_pid_smaps_rollup_operations
= {
959 .open
= smaps_rollup_open
,
962 .release
= smaps_rollup_release
,
965 enum clear_refs_types
{
969 CLEAR_REFS_SOFT_DIRTY
,
970 CLEAR_REFS_MM_HIWATER_RSS
,
974 struct clear_refs_private
{
975 enum clear_refs_types type
;
978 #ifdef CONFIG_MEM_SOFT_DIRTY
979 static inline void clear_soft_dirty(struct vm_area_struct
*vma
,
980 unsigned long addr
, pte_t
*pte
)
983 * The soft-dirty tracker uses #PF-s to catch writes
984 * to pages, so write-protect the pte as well. See the
985 * Documentation/admin-guide/mm/soft-dirty.rst for full description
986 * of how soft-dirty works.
990 if (pte_present(ptent
)) {
993 old_pte
= ptep_modify_prot_start(vma
, addr
, pte
);
994 ptent
= pte_wrprotect(old_pte
);
995 ptent
= pte_clear_soft_dirty(ptent
);
996 ptep_modify_prot_commit(vma
, addr
, pte
, old_pte
, ptent
);
997 } else if (is_swap_pte(ptent
)) {
998 ptent
= pte_swp_clear_soft_dirty(ptent
);
999 set_pte_at(vma
->vm_mm
, addr
, pte
, ptent
);
1003 static inline void clear_soft_dirty(struct vm_area_struct
*vma
,
1004 unsigned long addr
, pte_t
*pte
)
1009 #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
1010 static inline void clear_soft_dirty_pmd(struct vm_area_struct
*vma
,
1011 unsigned long addr
, pmd_t
*pmdp
)
1013 pmd_t old
, pmd
= *pmdp
;
1015 if (pmd_present(pmd
)) {
1016 /* See comment in change_huge_pmd() */
1017 old
= pmdp_invalidate(vma
, addr
, pmdp
);
1019 pmd
= pmd_mkdirty(pmd
);
1021 pmd
= pmd_mkyoung(pmd
);
1023 pmd
= pmd_wrprotect(pmd
);
1024 pmd
= pmd_clear_soft_dirty(pmd
);
1026 set_pmd_at(vma
->vm_mm
, addr
, pmdp
, pmd
);
1027 } else if (is_migration_entry(pmd_to_swp_entry(pmd
))) {
1028 pmd
= pmd_swp_clear_soft_dirty(pmd
);
1029 set_pmd_at(vma
->vm_mm
, addr
, pmdp
, pmd
);
1033 static inline void clear_soft_dirty_pmd(struct vm_area_struct
*vma
,
1034 unsigned long addr
, pmd_t
*pmdp
)
1039 static int clear_refs_pte_range(pmd_t
*pmd
, unsigned long addr
,
1040 unsigned long end
, struct mm_walk
*walk
)
1042 struct clear_refs_private
*cp
= walk
->private;
1043 struct vm_area_struct
*vma
= walk
->vma
;
1048 ptl
= pmd_trans_huge_lock(pmd
, vma
);
1050 if (cp
->type
== CLEAR_REFS_SOFT_DIRTY
) {
1051 clear_soft_dirty_pmd(vma
, addr
, pmd
);
1055 if (!pmd_present(*pmd
))
1058 page
= pmd_page(*pmd
);
1060 /* Clear accessed and referenced bits. */
1061 pmdp_test_and_clear_young(vma
, addr
, pmd
);
1062 test_and_clear_page_young(page
);
1063 ClearPageReferenced(page
);
1069 if (pmd_trans_unstable(pmd
))
1072 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
1073 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
) {
1076 if (cp
->type
== CLEAR_REFS_SOFT_DIRTY
) {
1077 clear_soft_dirty(vma
, addr
, pte
);
1081 if (!pte_present(ptent
))
1084 page
= vm_normal_page(vma
, addr
, ptent
);
1088 /* Clear accessed and referenced bits. */
1089 ptep_test_and_clear_young(vma
, addr
, pte
);
1090 test_and_clear_page_young(page
);
1091 ClearPageReferenced(page
);
1093 pte_unmap_unlock(pte
- 1, ptl
);
1098 static int clear_refs_test_walk(unsigned long start
, unsigned long end
,
1099 struct mm_walk
*walk
)
1101 struct clear_refs_private
*cp
= walk
->private;
1102 struct vm_area_struct
*vma
= walk
->vma
;
1104 if (vma
->vm_flags
& VM_PFNMAP
)
1108 * Writing 1 to /proc/pid/clear_refs affects all pages.
1109 * Writing 2 to /proc/pid/clear_refs only affects anonymous pages.
1110 * Writing 3 to /proc/pid/clear_refs only affects file mapped pages.
1111 * Writing 4 to /proc/pid/clear_refs affects all pages.
1113 if (cp
->type
== CLEAR_REFS_ANON
&& vma
->vm_file
)
1115 if (cp
->type
== CLEAR_REFS_MAPPED
&& !vma
->vm_file
)
1120 static ssize_t
clear_refs_write(struct file
*file
, const char __user
*buf
,
1121 size_t count
, loff_t
*ppos
)
1123 struct task_struct
*task
;
1124 char buffer
[PROC_NUMBUF
];
1125 struct mm_struct
*mm
;
1126 struct vm_area_struct
*vma
;
1127 enum clear_refs_types type
;
1128 struct mmu_gather tlb
;
1132 memset(buffer
, 0, sizeof(buffer
));
1133 if (count
> sizeof(buffer
) - 1)
1134 count
= sizeof(buffer
) - 1;
1135 if (copy_from_user(buffer
, buf
, count
))
1137 rv
= kstrtoint(strstrip(buffer
), 10, &itype
);
1140 type
= (enum clear_refs_types
)itype
;
1141 if (type
< CLEAR_REFS_ALL
|| type
>= CLEAR_REFS_LAST
)
1144 task
= get_proc_task(file_inode(file
));
1147 mm
= get_task_mm(task
);
1149 struct mmu_notifier_range range
;
1150 struct clear_refs_private cp
= {
1153 struct mm_walk clear_refs_walk
= {
1154 .pmd_entry
= clear_refs_pte_range
,
1155 .test_walk
= clear_refs_test_walk
,
1160 if (type
== CLEAR_REFS_MM_HIWATER_RSS
) {
1161 if (down_write_killable(&mm
->mmap_sem
)) {
1167 * Writing 5 to /proc/pid/clear_refs resets the peak
1168 * resident set size to this mm's current rss value.
1170 reset_mm_hiwater_rss(mm
);
1171 up_write(&mm
->mmap_sem
);
1175 if (down_read_killable(&mm
->mmap_sem
)) {
1179 tlb_gather_mmu(&tlb
, mm
, 0, -1);
1180 if (type
== CLEAR_REFS_SOFT_DIRTY
) {
1181 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
1182 if (!(vma
->vm_flags
& VM_SOFTDIRTY
))
1184 up_read(&mm
->mmap_sem
);
1185 if (down_write_killable(&mm
->mmap_sem
)) {
1190 * Avoid to modify vma->vm_flags
1191 * without locked ops while the
1192 * coredump reads the vm_flags.
1194 if (!mmget_still_valid(mm
)) {
1196 * Silently return "count"
1197 * like if get_task_mm()
1198 * failed. FIXME: should this
1199 * function have returned
1200 * -ESRCH if get_task_mm()
1202 * get_proc_task() fails?
1204 up_write(&mm
->mmap_sem
);
1207 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
1208 vma
->vm_flags
&= ~VM_SOFTDIRTY
;
1209 vma_set_page_prot(vma
);
1211 downgrade_write(&mm
->mmap_sem
);
1215 mmu_notifier_range_init(&range
, MMU_NOTIFY_SOFT_DIRTY
,
1216 0, NULL
, mm
, 0, -1UL);
1217 mmu_notifier_invalidate_range_start(&range
);
1219 walk_page_range(0, mm
->highest_vm_end
, &clear_refs_walk
);
1220 if (type
== CLEAR_REFS_SOFT_DIRTY
)
1221 mmu_notifier_invalidate_range_end(&range
);
1222 tlb_finish_mmu(&tlb
, 0, -1);
1223 up_read(&mm
->mmap_sem
);
1227 put_task_struct(task
);
1232 const struct file_operations proc_clear_refs_operations
= {
1233 .write
= clear_refs_write
,
1234 .llseek
= noop_llseek
,
1241 struct pagemapread
{
1242 int pos
, len
; /* units: PM_ENTRY_BYTES, not bytes */
1243 pagemap_entry_t
*buffer
;
1247 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
1248 #define PAGEMAP_WALK_MASK (PMD_MASK)
1250 #define PM_ENTRY_BYTES sizeof(pagemap_entry_t)
1251 #define PM_PFRAME_BITS 55
1252 #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0)
1253 #define PM_SOFT_DIRTY BIT_ULL(55)
1254 #define PM_MMAP_EXCLUSIVE BIT_ULL(56)
1255 #define PM_FILE BIT_ULL(61)
1256 #define PM_SWAP BIT_ULL(62)
1257 #define PM_PRESENT BIT_ULL(63)
1259 #define PM_END_OF_BUFFER 1
1261 static inline pagemap_entry_t
make_pme(u64 frame
, u64 flags
)
1263 return (pagemap_entry_t
) { .pme
= (frame
& PM_PFRAME_MASK
) | flags
};
1266 static int add_to_pagemap(unsigned long addr
, pagemap_entry_t
*pme
,
1267 struct pagemapread
*pm
)
1269 pm
->buffer
[pm
->pos
++] = *pme
;
1270 if (pm
->pos
>= pm
->len
)
1271 return PM_END_OF_BUFFER
;
1275 static int pagemap_pte_hole(unsigned long start
, unsigned long end
,
1276 struct mm_walk
*walk
)
1278 struct pagemapread
*pm
= walk
->private;
1279 unsigned long addr
= start
;
1282 while (addr
< end
) {
1283 struct vm_area_struct
*vma
= find_vma(walk
->mm
, addr
);
1284 pagemap_entry_t pme
= make_pme(0, 0);
1285 /* End of address space hole, which we mark as non-present. */
1286 unsigned long hole_end
;
1289 hole_end
= min(end
, vma
->vm_start
);
1293 for (; addr
< hole_end
; addr
+= PAGE_SIZE
) {
1294 err
= add_to_pagemap(addr
, &pme
, pm
);
1302 /* Addresses in the VMA. */
1303 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1304 pme
= make_pme(0, PM_SOFT_DIRTY
);
1305 for (; addr
< min(end
, vma
->vm_end
); addr
+= PAGE_SIZE
) {
1306 err
= add_to_pagemap(addr
, &pme
, pm
);
1315 static pagemap_entry_t
pte_to_pagemap_entry(struct pagemapread
*pm
,
1316 struct vm_area_struct
*vma
, unsigned long addr
, pte_t pte
)
1318 u64 frame
= 0, flags
= 0;
1319 struct page
*page
= NULL
;
1321 if (pte_present(pte
)) {
1323 frame
= pte_pfn(pte
);
1324 flags
|= PM_PRESENT
;
1325 page
= _vm_normal_page(vma
, addr
, pte
, true);
1326 if (pte_soft_dirty(pte
))
1327 flags
|= PM_SOFT_DIRTY
;
1328 } else if (is_swap_pte(pte
)) {
1330 if (pte_swp_soft_dirty(pte
))
1331 flags
|= PM_SOFT_DIRTY
;
1332 entry
= pte_to_swp_entry(pte
);
1334 frame
= swp_type(entry
) |
1335 (swp_offset(entry
) << MAX_SWAPFILES_SHIFT
);
1337 if (is_migration_entry(entry
))
1338 page
= migration_entry_to_page(entry
);
1340 if (is_device_private_entry(entry
))
1341 page
= device_private_entry_to_page(entry
);
1344 if (page
&& !PageAnon(page
))
1346 if (page
&& page_mapcount(page
) == 1)
1347 flags
|= PM_MMAP_EXCLUSIVE
;
1348 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1349 flags
|= PM_SOFT_DIRTY
;
1351 return make_pme(frame
, flags
);
1354 static int pagemap_pmd_range(pmd_t
*pmdp
, unsigned long addr
, unsigned long end
,
1355 struct mm_walk
*walk
)
1357 struct vm_area_struct
*vma
= walk
->vma
;
1358 struct pagemapread
*pm
= walk
->private;
1360 pte_t
*pte
, *orig_pte
;
1363 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1364 ptl
= pmd_trans_huge_lock(pmdp
, vma
);
1366 u64 flags
= 0, frame
= 0;
1368 struct page
*page
= NULL
;
1370 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1371 flags
|= PM_SOFT_DIRTY
;
1373 if (pmd_present(pmd
)) {
1374 page
= pmd_page(pmd
);
1376 flags
|= PM_PRESENT
;
1377 if (pmd_soft_dirty(pmd
))
1378 flags
|= PM_SOFT_DIRTY
;
1380 frame
= pmd_pfn(pmd
) +
1381 ((addr
& ~PMD_MASK
) >> PAGE_SHIFT
);
1383 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1384 else if (is_swap_pmd(pmd
)) {
1385 swp_entry_t entry
= pmd_to_swp_entry(pmd
);
1386 unsigned long offset
;
1389 offset
= swp_offset(entry
) +
1390 ((addr
& ~PMD_MASK
) >> PAGE_SHIFT
);
1391 frame
= swp_type(entry
) |
1392 (offset
<< MAX_SWAPFILES_SHIFT
);
1395 if (pmd_swp_soft_dirty(pmd
))
1396 flags
|= PM_SOFT_DIRTY
;
1397 VM_BUG_ON(!is_pmd_migration_entry(pmd
));
1398 page
= migration_entry_to_page(entry
);
1402 if (page
&& page_mapcount(page
) == 1)
1403 flags
|= PM_MMAP_EXCLUSIVE
;
1405 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
1406 pagemap_entry_t pme
= make_pme(frame
, flags
);
1408 err
= add_to_pagemap(addr
, &pme
, pm
);
1412 if (flags
& PM_PRESENT
)
1414 else if (flags
& PM_SWAP
)
1415 frame
+= (1 << MAX_SWAPFILES_SHIFT
);
1422 if (pmd_trans_unstable(pmdp
))
1424 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
1427 * We can assume that @vma always points to a valid one and @end never
1428 * goes beyond vma->vm_end.
1430 orig_pte
= pte
= pte_offset_map_lock(walk
->mm
, pmdp
, addr
, &ptl
);
1431 for (; addr
< end
; pte
++, addr
+= PAGE_SIZE
) {
1432 pagemap_entry_t pme
;
1434 pme
= pte_to_pagemap_entry(pm
, vma
, addr
, *pte
);
1435 err
= add_to_pagemap(addr
, &pme
, pm
);
1439 pte_unmap_unlock(orig_pte
, ptl
);
1446 #ifdef CONFIG_HUGETLB_PAGE
1447 /* This function walks within one hugetlb entry in the single call */
1448 static int pagemap_hugetlb_range(pte_t
*ptep
, unsigned long hmask
,
1449 unsigned long addr
, unsigned long end
,
1450 struct mm_walk
*walk
)
1452 struct pagemapread
*pm
= walk
->private;
1453 struct vm_area_struct
*vma
= walk
->vma
;
1454 u64 flags
= 0, frame
= 0;
1458 if (vma
->vm_flags
& VM_SOFTDIRTY
)
1459 flags
|= PM_SOFT_DIRTY
;
1461 pte
= huge_ptep_get(ptep
);
1462 if (pte_present(pte
)) {
1463 struct page
*page
= pte_page(pte
);
1465 if (!PageAnon(page
))
1468 if (page_mapcount(page
) == 1)
1469 flags
|= PM_MMAP_EXCLUSIVE
;
1471 flags
|= PM_PRESENT
;
1473 frame
= pte_pfn(pte
) +
1474 ((addr
& ~hmask
) >> PAGE_SHIFT
);
1477 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
1478 pagemap_entry_t pme
= make_pme(frame
, flags
);
1480 err
= add_to_pagemap(addr
, &pme
, pm
);
1483 if (pm
->show_pfn
&& (flags
& PM_PRESENT
))
1491 #endif /* HUGETLB_PAGE */
1494 * /proc/pid/pagemap - an array mapping virtual pages to pfns
1496 * For each page in the address space, this file contains one 64-bit entry
1497 * consisting of the following:
1499 * Bits 0-54 page frame number (PFN) if present
1500 * Bits 0-4 swap type if swapped
1501 * Bits 5-54 swap offset if swapped
1502 * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst)
1503 * Bit 56 page exclusively mapped
1505 * Bit 61 page is file-page or shared-anon
1506 * Bit 62 page swapped
1507 * Bit 63 page present
1509 * If the page is not present but in swap, then the PFN contains an
1510 * encoding of the swap file number and the page's offset into the
1511 * swap. Unmapped pages return a null PFN. This allows determining
1512 * precisely which pages are mapped (or in swap) and comparing mapped
1513 * pages between processes.
1515 * Efficient users of this interface will use /proc/pid/maps to
1516 * determine which areas of memory are actually mapped and llseek to
1517 * skip over unmapped regions.
1519 static ssize_t
pagemap_read(struct file
*file
, char __user
*buf
,
1520 size_t count
, loff_t
*ppos
)
1522 struct mm_struct
*mm
= file
->private_data
;
1523 struct pagemapread pm
;
1524 struct mm_walk pagemap_walk
= {};
1526 unsigned long svpfn
;
1527 unsigned long start_vaddr
;
1528 unsigned long end_vaddr
;
1529 int ret
= 0, copied
= 0;
1531 if (!mm
|| !mmget_not_zero(mm
))
1535 /* file position must be aligned */
1536 if ((*ppos
% PM_ENTRY_BYTES
) || (count
% PM_ENTRY_BYTES
))
1543 /* do not disclose physical addresses: attack vector */
1544 pm
.show_pfn
= file_ns_capable(file
, &init_user_ns
, CAP_SYS_ADMIN
);
1546 pm
.len
= (PAGEMAP_WALK_SIZE
>> PAGE_SHIFT
);
1547 pm
.buffer
= kmalloc_array(pm
.len
, PM_ENTRY_BYTES
, GFP_KERNEL
);
1552 pagemap_walk
.pmd_entry
= pagemap_pmd_range
;
1553 pagemap_walk
.pte_hole
= pagemap_pte_hole
;
1554 #ifdef CONFIG_HUGETLB_PAGE
1555 pagemap_walk
.hugetlb_entry
= pagemap_hugetlb_range
;
1557 pagemap_walk
.mm
= mm
;
1558 pagemap_walk
.private = &pm
;
1561 svpfn
= src
/ PM_ENTRY_BYTES
;
1562 start_vaddr
= svpfn
<< PAGE_SHIFT
;
1563 end_vaddr
= mm
->task_size
;
1565 /* watch out for wraparound */
1566 if (svpfn
> mm
->task_size
>> PAGE_SHIFT
)
1567 start_vaddr
= end_vaddr
;
1570 * The odds are that this will stop walking way
1571 * before end_vaddr, because the length of the
1572 * user buffer is tracked in "pm", and the walk
1573 * will stop when we hit the end of the buffer.
1576 while (count
&& (start_vaddr
< end_vaddr
)) {
1581 end
= (start_vaddr
+ PAGEMAP_WALK_SIZE
) & PAGEMAP_WALK_MASK
;
1583 if (end
< start_vaddr
|| end
> end_vaddr
)
1585 ret
= down_read_killable(&mm
->mmap_sem
);
1588 ret
= walk_page_range(start_vaddr
, end
, &pagemap_walk
);
1589 up_read(&mm
->mmap_sem
);
1592 len
= min(count
, PM_ENTRY_BYTES
* pm
.pos
);
1593 if (copy_to_user(buf
, pm
.buffer
, len
)) {
1602 if (!ret
|| ret
== PM_END_OF_BUFFER
)
1613 static int pagemap_open(struct inode
*inode
, struct file
*file
)
1615 struct mm_struct
*mm
;
1617 mm
= proc_mem_open(inode
, PTRACE_MODE_READ
);
1620 file
->private_data
= mm
;
1624 static int pagemap_release(struct inode
*inode
, struct file
*file
)
1626 struct mm_struct
*mm
= file
->private_data
;
1633 const struct file_operations proc_pagemap_operations
= {
1634 .llseek
= mem_lseek
, /* borrow this */
1635 .read
= pagemap_read
,
1636 .open
= pagemap_open
,
1637 .release
= pagemap_release
,
1639 #endif /* CONFIG_PROC_PAGE_MONITOR */
1644 unsigned long pages
;
1646 unsigned long active
;
1647 unsigned long writeback
;
1648 unsigned long mapcount_max
;
1649 unsigned long dirty
;
1650 unsigned long swapcache
;
1651 unsigned long node
[MAX_NUMNODES
];
1654 struct numa_maps_private
{
1655 struct proc_maps_private proc_maps
;
1656 struct numa_maps md
;
1659 static void gather_stats(struct page
*page
, struct numa_maps
*md
, int pte_dirty
,
1660 unsigned long nr_pages
)
1662 int count
= page_mapcount(page
);
1664 md
->pages
+= nr_pages
;
1665 if (pte_dirty
|| PageDirty(page
))
1666 md
->dirty
+= nr_pages
;
1668 if (PageSwapCache(page
))
1669 md
->swapcache
+= nr_pages
;
1671 if (PageActive(page
) || PageUnevictable(page
))
1672 md
->active
+= nr_pages
;
1674 if (PageWriteback(page
))
1675 md
->writeback
+= nr_pages
;
1678 md
->anon
+= nr_pages
;
1680 if (count
> md
->mapcount_max
)
1681 md
->mapcount_max
= count
;
1683 md
->node
[page_to_nid(page
)] += nr_pages
;
1686 static struct page
*can_gather_numa_stats(pte_t pte
, struct vm_area_struct
*vma
,
1692 if (!pte_present(pte
))
1695 page
= vm_normal_page(vma
, addr
, pte
);
1699 if (PageReserved(page
))
1702 nid
= page_to_nid(page
);
1703 if (!node_isset(nid
, node_states
[N_MEMORY
]))
1709 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1710 static struct page
*can_gather_numa_stats_pmd(pmd_t pmd
,
1711 struct vm_area_struct
*vma
,
1717 if (!pmd_present(pmd
))
1720 page
= vm_normal_page_pmd(vma
, addr
, pmd
);
1724 if (PageReserved(page
))
1727 nid
= page_to_nid(page
);
1728 if (!node_isset(nid
, node_states
[N_MEMORY
]))
1735 static int gather_pte_stats(pmd_t
*pmd
, unsigned long addr
,
1736 unsigned long end
, struct mm_walk
*walk
)
1738 struct numa_maps
*md
= walk
->private;
1739 struct vm_area_struct
*vma
= walk
->vma
;
1744 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
1745 ptl
= pmd_trans_huge_lock(pmd
, vma
);
1749 page
= can_gather_numa_stats_pmd(*pmd
, vma
, addr
);
1751 gather_stats(page
, md
, pmd_dirty(*pmd
),
1752 HPAGE_PMD_SIZE
/PAGE_SIZE
);
1757 if (pmd_trans_unstable(pmd
))
1760 orig_pte
= pte
= pte_offset_map_lock(walk
->mm
, pmd
, addr
, &ptl
);
1762 struct page
*page
= can_gather_numa_stats(*pte
, vma
, addr
);
1765 gather_stats(page
, md
, pte_dirty(*pte
), 1);
1767 } while (pte
++, addr
+= PAGE_SIZE
, addr
!= end
);
1768 pte_unmap_unlock(orig_pte
, ptl
);
1772 #ifdef CONFIG_HUGETLB_PAGE
1773 static int gather_hugetlb_stats(pte_t
*pte
, unsigned long hmask
,
1774 unsigned long addr
, unsigned long end
, struct mm_walk
*walk
)
1776 pte_t huge_pte
= huge_ptep_get(pte
);
1777 struct numa_maps
*md
;
1780 if (!pte_present(huge_pte
))
1783 page
= pte_page(huge_pte
);
1788 gather_stats(page
, md
, pte_dirty(huge_pte
), 1);
1793 static int gather_hugetlb_stats(pte_t
*pte
, unsigned long hmask
,
1794 unsigned long addr
, unsigned long end
, struct mm_walk
*walk
)
1801 * Display pages allocated per node and memory policy via /proc.
1803 static int show_numa_map(struct seq_file
*m
, void *v
)
1805 struct numa_maps_private
*numa_priv
= m
->private;
1806 struct proc_maps_private
*proc_priv
= &numa_priv
->proc_maps
;
1807 struct vm_area_struct
*vma
= v
;
1808 struct numa_maps
*md
= &numa_priv
->md
;
1809 struct file
*file
= vma
->vm_file
;
1810 struct mm_struct
*mm
= vma
->vm_mm
;
1811 struct mm_walk walk
= {
1812 .hugetlb_entry
= gather_hugetlb_stats
,
1813 .pmd_entry
= gather_pte_stats
,
1817 struct mempolicy
*pol
;
1824 /* Ensure we start with an empty set of numa_maps statistics. */
1825 memset(md
, 0, sizeof(*md
));
1827 pol
= __get_vma_policy(vma
, vma
->vm_start
);
1829 mpol_to_str(buffer
, sizeof(buffer
), pol
);
1832 mpol_to_str(buffer
, sizeof(buffer
), proc_priv
->task_mempolicy
);
1835 seq_printf(m
, "%08lx %s", vma
->vm_start
, buffer
);
1838 seq_puts(m
, " file=");
1839 seq_file_path(m
, file
, "\n\t= ");
1840 } else if (vma
->vm_start
<= mm
->brk
&& vma
->vm_end
>= mm
->start_brk
) {
1841 seq_puts(m
, " heap");
1842 } else if (is_stack(vma
)) {
1843 seq_puts(m
, " stack");
1846 if (is_vm_hugetlb_page(vma
))
1847 seq_puts(m
, " huge");
1849 /* mmap_sem is held by m_start */
1850 walk_page_vma(vma
, &walk
);
1856 seq_printf(m
, " anon=%lu", md
->anon
);
1859 seq_printf(m
, " dirty=%lu", md
->dirty
);
1861 if (md
->pages
!= md
->anon
&& md
->pages
!= md
->dirty
)
1862 seq_printf(m
, " mapped=%lu", md
->pages
);
1864 if (md
->mapcount_max
> 1)
1865 seq_printf(m
, " mapmax=%lu", md
->mapcount_max
);
1868 seq_printf(m
, " swapcache=%lu", md
->swapcache
);
1870 if (md
->active
< md
->pages
&& !is_vm_hugetlb_page(vma
))
1871 seq_printf(m
, " active=%lu", md
->active
);
1874 seq_printf(m
, " writeback=%lu", md
->writeback
);
1876 for_each_node_state(nid
, N_MEMORY
)
1878 seq_printf(m
, " N%d=%lu", nid
, md
->node
[nid
]);
1880 seq_printf(m
, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma
) >> 10);
1883 m_cache_vma(m
, vma
);
1887 static const struct seq_operations proc_pid_numa_maps_op
= {
1891 .show
= show_numa_map
,
1894 static int pid_numa_maps_open(struct inode
*inode
, struct file
*file
)
1896 return proc_maps_open(inode
, file
, &proc_pid_numa_maps_op
,
1897 sizeof(struct numa_maps_private
));
1900 const struct file_operations proc_pid_numa_maps_operations
= {
1901 .open
= pid_numa_maps_open
,
1903 .llseek
= seq_lseek
,
1904 .release
= proc_map_release
,
1907 #endif /* CONFIG_NUMA */