2 #include <linux/hugetlb.h>
3 #include <linux/mount.h>
4 #include <linux/seq_file.h>
5 #include <linux/highmem.h>
6 #include <linux/ptrace.h>
7 #include <linux/slab.h>
8 #include <linux/pagemap.h>
9 #include <linux/mempolicy.h>
10 #include <linux/swap.h>
11 #include <linux/swapops.h>
14 #include <asm/uaccess.h>
15 #include <asm/tlbflush.h>
18 void task_mem(struct seq_file
*m
, struct mm_struct
*mm
)
20 unsigned long data
, text
, lib
, swap
;
21 unsigned long hiwater_vm
, total_vm
, hiwater_rss
, total_rss
;
24 * Note: to minimize their overhead, mm maintains hiwater_vm and
25 * hiwater_rss only when about to *lower* total_vm or rss. Any
26 * collector of these hiwater stats must therefore get total_vm
27 * and rss too, which will usually be the higher. Barriers? not
28 * worth the effort, such snapshots can always be inconsistent.
30 hiwater_vm
= total_vm
= mm
->total_vm
;
31 if (hiwater_vm
< mm
->hiwater_vm
)
32 hiwater_vm
= mm
->hiwater_vm
;
33 hiwater_rss
= total_rss
= get_mm_rss(mm
);
34 if (hiwater_rss
< mm
->hiwater_rss
)
35 hiwater_rss
= mm
->hiwater_rss
;
37 data
= mm
->total_vm
- mm
->shared_vm
- mm
->stack_vm
;
38 text
= (PAGE_ALIGN(mm
->end_code
) - (mm
->start_code
& PAGE_MASK
)) >> 10;
39 lib
= (mm
->exec_vm
<< (PAGE_SHIFT
-10)) - text
;
40 swap
= get_mm_counter(mm
, MM_SWAPENTS
);
53 hiwater_vm
<< (PAGE_SHIFT
-10),
54 (total_vm
- mm
->reserved_vm
) << (PAGE_SHIFT
-10),
55 mm
->locked_vm
<< (PAGE_SHIFT
-10),
56 hiwater_rss
<< (PAGE_SHIFT
-10),
57 total_rss
<< (PAGE_SHIFT
-10),
58 data
<< (PAGE_SHIFT
-10),
59 mm
->stack_vm
<< (PAGE_SHIFT
-10), text
, lib
,
60 (PTRS_PER_PTE
*sizeof(pte_t
)*mm
->nr_ptes
) >> 10,
61 swap
<< (PAGE_SHIFT
-10));
64 unsigned long task_vsize(struct mm_struct
*mm
)
66 return PAGE_SIZE
* mm
->total_vm
;
69 int task_statm(struct mm_struct
*mm
, int *shared
, int *text
,
70 int *data
, int *resident
)
72 *shared
= get_mm_counter(mm
, MM_FILEPAGES
);
73 *text
= (PAGE_ALIGN(mm
->end_code
) - (mm
->start_code
& PAGE_MASK
))
75 *data
= mm
->total_vm
- mm
->shared_vm
;
76 *resident
= *shared
+ get_mm_counter(mm
, MM_ANONPAGES
);
80 static void pad_len_spaces(struct seq_file
*m
, int len
)
82 len
= 25 + sizeof(void*) * 6 - len
;
85 seq_printf(m
, "%*c", len
, ' ');
88 static void vma_stop(struct proc_maps_private
*priv
, struct vm_area_struct
*vma
)
90 if (vma
&& vma
!= priv
->tail_vma
) {
91 struct mm_struct
*mm
= vma
->vm_mm
;
92 up_read(&mm
->mmap_sem
);
97 static void *m_start(struct seq_file
*m
, loff_t
*pos
)
99 struct proc_maps_private
*priv
= m
->private;
100 unsigned long last_addr
= m
->version
;
101 struct mm_struct
*mm
;
102 struct vm_area_struct
*vma
, *tail_vma
= NULL
;
105 /* Clear the per syscall fields in priv */
107 priv
->tail_vma
= NULL
;
110 * We remember last_addr rather than next_addr to hit with
111 * mmap_cache most of the time. We have zero last_addr at
112 * the beginning and also after lseek. We will have -1 last_addr
113 * after the end of the vmas.
116 if (last_addr
== -1UL)
119 priv
->task
= get_pid_task(priv
->pid
, PIDTYPE_PID
);
123 mm
= mm_for_maps(priv
->task
);
126 down_read(&mm
->mmap_sem
);
128 tail_vma
= get_gate_vma(priv
->task
);
129 priv
->tail_vma
= tail_vma
;
131 /* Start with last addr hint */
132 vma
= find_vma(mm
, last_addr
);
133 if (last_addr
&& vma
) {
139 * Check the vma index is within the range and do
140 * sequential scan until m_index.
143 if ((unsigned long)l
< mm
->map_count
) {
150 if (l
!= mm
->map_count
)
151 tail_vma
= NULL
; /* After gate vma */
157 /* End of vmas has been reached */
158 m
->version
= (tail_vma
!= NULL
)? 0: -1UL;
159 up_read(&mm
->mmap_sem
);
164 static void *m_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
166 struct proc_maps_private
*priv
= m
->private;
167 struct vm_area_struct
*vma
= v
;
168 struct vm_area_struct
*tail_vma
= priv
->tail_vma
;
171 if (vma
&& (vma
!= tail_vma
) && vma
->vm_next
)
174 return (vma
!= tail_vma
)? tail_vma
: NULL
;
177 static void m_stop(struct seq_file
*m
, void *v
)
179 struct proc_maps_private
*priv
= m
->private;
180 struct vm_area_struct
*vma
= v
;
184 put_task_struct(priv
->task
);
187 static int do_maps_open(struct inode
*inode
, struct file
*file
,
188 const struct seq_operations
*ops
)
190 struct proc_maps_private
*priv
;
192 priv
= kzalloc(sizeof(*priv
), GFP_KERNEL
);
194 priv
->pid
= proc_pid(inode
);
195 ret
= seq_open(file
, ops
);
197 struct seq_file
*m
= file
->private_data
;
206 static void show_map_vma(struct seq_file
*m
, struct vm_area_struct
*vma
)
208 struct mm_struct
*mm
= vma
->vm_mm
;
209 struct file
*file
= vma
->vm_file
;
210 int flags
= vma
->vm_flags
;
211 unsigned long ino
= 0;
212 unsigned long long pgoff
= 0;
218 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
219 dev
= inode
->i_sb
->s_dev
;
221 pgoff
= ((loff_t
)vma
->vm_pgoff
) << PAGE_SHIFT
;
224 /* We don't show the stack guard page in /proc/maps */
225 start
= vma
->vm_start
;
226 if (vma
->vm_flags
& VM_GROWSDOWN
)
229 seq_printf(m
, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
232 flags
& VM_READ
? 'r' : '-',
233 flags
& VM_WRITE
? 'w' : '-',
234 flags
& VM_EXEC
? 'x' : '-',
235 flags
& VM_MAYSHARE
? 's' : 'p',
237 MAJOR(dev
), MINOR(dev
), ino
, &len
);
240 * Print the dentry name for named mappings, and a
241 * special [heap] marker for the heap:
244 pad_len_spaces(m
, len
);
245 seq_path(m
, &file
->f_path
, "\n");
247 const char *name
= arch_vma_name(vma
);
250 if (vma
->vm_start
<= mm
->start_brk
&&
251 vma
->vm_end
>= mm
->brk
) {
253 } else if (vma
->vm_start
<= mm
->start_stack
&&
254 vma
->vm_end
>= mm
->start_stack
) {
262 pad_len_spaces(m
, len
);
269 static int show_map(struct seq_file
*m
, void *v
)
271 struct vm_area_struct
*vma
= v
;
272 struct proc_maps_private
*priv
= m
->private;
273 struct task_struct
*task
= priv
->task
;
275 show_map_vma(m
, vma
);
277 if (m
->count
< m
->size
) /* vma is copied successfully */
278 m
->version
= (vma
!= get_gate_vma(task
))? vma
->vm_start
: 0;
282 static const struct seq_operations proc_pid_maps_op
= {
289 static int maps_open(struct inode
*inode
, struct file
*file
)
291 return do_maps_open(inode
, file
, &proc_pid_maps_op
);
294 const struct file_operations proc_maps_operations
= {
298 .release
= seq_release_private
,
302 * Proportional Set Size(PSS): my share of RSS.
304 * PSS of a process is the count of pages it has in memory, where each
305 * page is divided by the number of processes sharing it. So if a
306 * process has 1000 pages all to itself, and 1000 shared with one other
307 * process, its PSS will be 1500.
309 * To keep (accumulated) division errors low, we adopt a 64bit
310 * fixed-point pss counter to minimize division errors. So (pss >>
311 * PSS_SHIFT) would be the real byte count.
313 * A shift of 12 before division means (assuming 4K page size):
314 * - 1M 3-user-pages add up to 8KB errors;
315 * - supports mapcount up to 2^24, or 16M;
316 * - supports PSS up to 2^52 bytes, or 4PB.
320 #ifdef CONFIG_PROC_PAGE_MONITOR
321 struct mem_size_stats
{
322 struct vm_area_struct
*vma
;
323 unsigned long resident
;
324 unsigned long shared_clean
;
325 unsigned long shared_dirty
;
326 unsigned long private_clean
;
327 unsigned long private_dirty
;
328 unsigned long referenced
;
333 static int smaps_pte_range(pmd_t
*pmd
, unsigned long addr
, unsigned long end
,
334 struct mm_walk
*walk
)
336 struct mem_size_stats
*mss
= walk
->private;
337 struct vm_area_struct
*vma
= mss
->vma
;
343 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
344 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
) {
347 if (is_swap_pte(ptent
)) {
348 mss
->swap
+= PAGE_SIZE
;
352 if (!pte_present(ptent
))
355 page
= vm_normal_page(vma
, addr
, ptent
);
359 mss
->resident
+= PAGE_SIZE
;
360 /* Accumulate the size in pages that have been accessed. */
361 if (pte_young(ptent
) || PageReferenced(page
))
362 mss
->referenced
+= PAGE_SIZE
;
363 mapcount
= page_mapcount(page
);
365 if (pte_dirty(ptent
))
366 mss
->shared_dirty
+= PAGE_SIZE
;
368 mss
->shared_clean
+= PAGE_SIZE
;
369 mss
->pss
+= (PAGE_SIZE
<< PSS_SHIFT
) / mapcount
;
371 if (pte_dirty(ptent
))
372 mss
->private_dirty
+= PAGE_SIZE
;
374 mss
->private_clean
+= PAGE_SIZE
;
375 mss
->pss
+= (PAGE_SIZE
<< PSS_SHIFT
);
378 pte_unmap_unlock(pte
- 1, ptl
);
383 static int show_smap(struct seq_file
*m
, void *v
)
385 struct proc_maps_private
*priv
= m
->private;
386 struct task_struct
*task
= priv
->task
;
387 struct vm_area_struct
*vma
= v
;
388 struct mem_size_stats mss
;
389 struct mm_walk smaps_walk
= {
390 .pmd_entry
= smaps_pte_range
,
395 memset(&mss
, 0, sizeof mss
);
397 /* mmap_sem is held in m_start */
398 if (vma
->vm_mm
&& !is_vm_hugetlb_page(vma
))
399 walk_page_range(vma
->vm_start
, vma
->vm_end
, &smaps_walk
);
401 show_map_vma(m
, vma
);
407 "Shared_Clean: %8lu kB\n"
408 "Shared_Dirty: %8lu kB\n"
409 "Private_Clean: %8lu kB\n"
410 "Private_Dirty: %8lu kB\n"
411 "Referenced: %8lu kB\n"
413 "KernelPageSize: %8lu kB\n"
414 "MMUPageSize: %8lu kB\n",
415 (vma
->vm_end
- vma
->vm_start
) >> 10,
417 (unsigned long)(mss
.pss
>> (10 + PSS_SHIFT
)),
418 mss
.shared_clean
>> 10,
419 mss
.shared_dirty
>> 10,
420 mss
.private_clean
>> 10,
421 mss
.private_dirty
>> 10,
422 mss
.referenced
>> 10,
424 vma_kernel_pagesize(vma
) >> 10,
425 vma_mmu_pagesize(vma
) >> 10);
427 if (m
->count
< m
->size
) /* vma is copied successfully */
428 m
->version
= (vma
!= get_gate_vma(task
)) ? vma
->vm_start
: 0;
432 static const struct seq_operations proc_pid_smaps_op
= {
439 static int smaps_open(struct inode
*inode
, struct file
*file
)
441 return do_maps_open(inode
, file
, &proc_pid_smaps_op
);
444 const struct file_operations proc_smaps_operations
= {
448 .release
= seq_release_private
,
451 static int clear_refs_pte_range(pmd_t
*pmd
, unsigned long addr
,
452 unsigned long end
, struct mm_walk
*walk
)
454 struct vm_area_struct
*vma
= walk
->private;
459 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
460 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
) {
462 if (!pte_present(ptent
))
465 page
= vm_normal_page(vma
, addr
, ptent
);
469 /* Clear accessed and referenced bits. */
470 ptep_test_and_clear_young(vma
, addr
, pte
);
471 ClearPageReferenced(page
);
473 pte_unmap_unlock(pte
- 1, ptl
);
478 #define CLEAR_REFS_ALL 1
479 #define CLEAR_REFS_ANON 2
480 #define CLEAR_REFS_MAPPED 3
482 static ssize_t
clear_refs_write(struct file
*file
, const char __user
*buf
,
483 size_t count
, loff_t
*ppos
)
485 struct task_struct
*task
;
486 char buffer
[PROC_NUMBUF
];
487 struct mm_struct
*mm
;
488 struct vm_area_struct
*vma
;
491 memset(buffer
, 0, sizeof(buffer
));
492 if (count
> sizeof(buffer
) - 1)
493 count
= sizeof(buffer
) - 1;
494 if (copy_from_user(buffer
, buf
, count
))
496 if (strict_strtol(strstrip(buffer
), 10, &type
))
498 if (type
< CLEAR_REFS_ALL
|| type
> CLEAR_REFS_MAPPED
)
500 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
503 mm
= get_task_mm(task
);
505 struct mm_walk clear_refs_walk
= {
506 .pmd_entry
= clear_refs_pte_range
,
509 down_read(&mm
->mmap_sem
);
510 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
511 clear_refs_walk
.private = vma
;
512 if (is_vm_hugetlb_page(vma
))
515 * Writing 1 to /proc/pid/clear_refs affects all pages.
517 * Writing 2 to /proc/pid/clear_refs only affects
520 * Writing 3 to /proc/pid/clear_refs only affects file
523 if (type
== CLEAR_REFS_ANON
&& vma
->vm_file
)
525 if (type
== CLEAR_REFS_MAPPED
&& !vma
->vm_file
)
527 walk_page_range(vma
->vm_start
, vma
->vm_end
,
531 up_read(&mm
->mmap_sem
);
534 put_task_struct(task
);
539 const struct file_operations proc_clear_refs_operations
= {
540 .write
= clear_refs_write
,
548 #define PM_ENTRY_BYTES sizeof(u64)
549 #define PM_STATUS_BITS 3
550 #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
551 #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
552 #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
553 #define PM_PSHIFT_BITS 6
554 #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
555 #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
556 #define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
557 #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
558 #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
560 #define PM_PRESENT PM_STATUS(4LL)
561 #define PM_SWAP PM_STATUS(2LL)
562 #define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT)
563 #define PM_END_OF_BUFFER 1
565 static int add_to_pagemap(unsigned long addr
, u64 pfn
,
566 struct pagemapread
*pm
)
568 pm
->buffer
[pm
->pos
++] = pfn
;
569 if (pm
->pos
>= pm
->len
)
570 return PM_END_OF_BUFFER
;
574 static int pagemap_pte_hole(unsigned long start
, unsigned long end
,
575 struct mm_walk
*walk
)
577 struct pagemapread
*pm
= walk
->private;
580 for (addr
= start
; addr
< end
; addr
+= PAGE_SIZE
) {
581 err
= add_to_pagemap(addr
, PM_NOT_PRESENT
, pm
);
588 static u64
swap_pte_to_pagemap_entry(pte_t pte
)
590 swp_entry_t e
= pte_to_swp_entry(pte
);
591 return swp_type(e
) | (swp_offset(e
) << MAX_SWAPFILES_SHIFT
);
594 static u64
pte_to_pagemap_entry(pte_t pte
)
597 if (is_swap_pte(pte
))
598 pme
= PM_PFRAME(swap_pte_to_pagemap_entry(pte
))
599 | PM_PSHIFT(PAGE_SHIFT
) | PM_SWAP
;
600 else if (pte_present(pte
))
601 pme
= PM_PFRAME(pte_pfn(pte
))
602 | PM_PSHIFT(PAGE_SHIFT
) | PM_PRESENT
;
606 static int pagemap_pte_range(pmd_t
*pmd
, unsigned long addr
, unsigned long end
,
607 struct mm_walk
*walk
)
609 struct vm_area_struct
*vma
;
610 struct pagemapread
*pm
= walk
->private;
614 /* find the first VMA at or above 'addr' */
615 vma
= find_vma(walk
->mm
, addr
);
616 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
617 u64 pfn
= PM_NOT_PRESENT
;
619 /* check to see if we've left 'vma' behind
620 * and need a new, higher one */
621 if (vma
&& (addr
>= vma
->vm_end
))
622 vma
= find_vma(walk
->mm
, addr
);
624 /* check that 'vma' actually covers this address,
625 * and that it isn't a huge page vma */
626 if (vma
&& (vma
->vm_start
<= addr
) &&
627 !is_vm_hugetlb_page(vma
)) {
628 pte
= pte_offset_map(pmd
, addr
);
629 pfn
= pte_to_pagemap_entry(*pte
);
630 /* unmap before userspace copy */
633 err
= add_to_pagemap(addr
, pfn
, pm
);
643 #ifdef CONFIG_HUGETLB_PAGE
644 static u64
huge_pte_to_pagemap_entry(pte_t pte
, int offset
)
647 if (pte_present(pte
))
648 pme
= PM_PFRAME(pte_pfn(pte
) + offset
)
649 | PM_PSHIFT(PAGE_SHIFT
) | PM_PRESENT
;
653 /* This function walks within one hugetlb entry in the single call */
654 static int pagemap_hugetlb_range(pte_t
*pte
, unsigned long hmask
,
655 unsigned long addr
, unsigned long end
,
656 struct mm_walk
*walk
)
658 struct pagemapread
*pm
= walk
->private;
662 for (; addr
!= end
; addr
+= PAGE_SIZE
) {
663 int offset
= (addr
& ~hmask
) >> PAGE_SHIFT
;
664 pfn
= huge_pte_to_pagemap_entry(*pte
, offset
);
665 err
= add_to_pagemap(addr
, pfn
, pm
);
674 #endif /* HUGETLB_PAGE */
677 * /proc/pid/pagemap - an array mapping virtual pages to pfns
679 * For each page in the address space, this file contains one 64-bit entry
680 * consisting of the following:
682 * Bits 0-55 page frame number (PFN) if present
683 * Bits 0-4 swap type if swapped
684 * Bits 5-55 swap offset if swapped
685 * Bits 55-60 page shift (page size = 1<<page shift)
686 * Bit 61 reserved for future use
687 * Bit 62 page swapped
688 * Bit 63 page present
690 * If the page is not present but in swap, then the PFN contains an
691 * encoding of the swap file number and the page's offset into the
692 * swap. Unmapped pages return a null PFN. This allows determining
693 * precisely which pages are mapped (or in swap) and comparing mapped
694 * pages between processes.
696 * Efficient users of this interface will use /proc/pid/maps to
697 * determine which areas of memory are actually mapped and llseek to
698 * skip over unmapped regions.
700 #define PAGEMAP_WALK_SIZE (PMD_SIZE)
701 static ssize_t
pagemap_read(struct file
*file
, char __user
*buf
,
702 size_t count
, loff_t
*ppos
)
704 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
705 struct mm_struct
*mm
;
706 struct pagemapread pm
;
708 struct mm_walk pagemap_walk
= {};
711 unsigned long start_vaddr
;
712 unsigned long end_vaddr
;
719 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
723 /* file position must be aligned */
724 if ((*ppos
% PM_ENTRY_BYTES
) || (count
% PM_ENTRY_BYTES
))
732 mm
= get_task_mm(task
);
736 pm
.len
= PM_ENTRY_BYTES
* (PAGEMAP_WALK_SIZE
>> PAGE_SHIFT
);
737 pm
.buffer
= kmalloc(pm
.len
, GFP_TEMPORARY
);
742 pagemap_walk
.pmd_entry
= pagemap_pte_range
;
743 pagemap_walk
.pte_hole
= pagemap_pte_hole
;
744 #ifdef CONFIG_HUGETLB_PAGE
745 pagemap_walk
.hugetlb_entry
= pagemap_hugetlb_range
;
747 pagemap_walk
.mm
= mm
;
748 pagemap_walk
.private = &pm
;
751 svpfn
= src
/ PM_ENTRY_BYTES
;
752 start_vaddr
= svpfn
<< PAGE_SHIFT
;
753 end_vaddr
= TASK_SIZE_OF(task
);
755 /* watch out for wraparound */
756 if (svpfn
> TASK_SIZE_OF(task
) >> PAGE_SHIFT
)
757 start_vaddr
= end_vaddr
;
760 * The odds are that this will stop walking way
761 * before end_vaddr, because the length of the
762 * user buffer is tracked in "pm", and the walk
763 * will stop when we hit the end of the buffer.
766 while (count
&& (start_vaddr
< end_vaddr
)) {
771 end
= start_vaddr
+ PAGEMAP_WALK_SIZE
;
773 if (end
< start_vaddr
|| end
> end_vaddr
)
775 down_read(&mm
->mmap_sem
);
776 ret
= walk_page_range(start_vaddr
, end
, &pagemap_walk
);
777 up_read(&mm
->mmap_sem
);
780 len
= min(count
, PM_ENTRY_BYTES
* pm
.pos
);
781 if (copy_to_user(buf
, pm
.buffer
, len
)) {
790 if (!ret
|| ret
== PM_END_OF_BUFFER
)
798 put_task_struct(task
);
803 const struct file_operations proc_pagemap_operations
= {
804 .llseek
= mem_lseek
, /* borrow this */
805 .read
= pagemap_read
,
807 #endif /* CONFIG_PROC_PAGE_MONITOR */
810 extern int show_numa_map(struct seq_file
*m
, void *v
);
812 static const struct seq_operations proc_pid_numa_maps_op
= {
816 .show
= show_numa_map
,
819 static int numa_maps_open(struct inode
*inode
, struct file
*file
)
821 return do_maps_open(inode
, file
, &proc_pid_numa_maps_op
);
824 const struct file_operations proc_numa_maps_operations
= {
825 .open
= numa_maps_open
,
828 .release
= seq_release_private
,