blob: 3efa7253523e77c7a07d47d340f6df7a88deb741 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/mm.h>
2#include <linux/hugetlb.h>
Dave Hansen22e057c2011-03-22 16:33:00 -07003#include <linux/huge_mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#include <linux/mount.h>
5#include <linux/seq_file.h>
Mauricio Line070ad42005-09-03 15:55:10 -07006#include <linux/highmem.h>
Kees Cook5096add2007-05-08 00:26:04 -07007#include <linux/ptrace.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Christoph Lameter6e21c8f2005-09-03 15:54:45 -07009#include <linux/pagemap.h>
10#include <linux/mempolicy.h>
Dave Hansen22e057c2011-03-22 16:33:00 -070011#include <linux/rmap.h>
Matt Mackall85863e42008-02-04 22:29:04 -080012#include <linux/swap.h>
13#include <linux/swapops.h>
Mauricio Line070ad42005-09-03 15:55:10 -070014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/elf.h>
16#include <asm/uaccess.h>
Mauricio Line070ad42005-09-03 15:55:10 -070017#include <asm/tlbflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "internal.h"
19
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080020void task_mem(struct seq_file *m, struct mm_struct *mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070021{
KAMEZAWA Hiroyukib084d432010-03-05 13:41:42 -080022 unsigned long data, text, lib, swap;
Hugh Dickins365e9c872005-10-29 18:16:18 -070023 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
24
25 /*
26 * Note: to minimize their overhead, mm maintains hiwater_vm and
27 * hiwater_rss only when about to *lower* total_vm or rss. Any
28 * collector of these hiwater stats must therefore get total_vm
29 * and rss too, which will usually be the higher. Barriers? not
30 * worth the effort, such snapshots can always be inconsistent.
31 */
32 hiwater_vm = total_vm = mm->total_vm;
33 if (hiwater_vm < mm->hiwater_vm)
34 hiwater_vm = mm->hiwater_vm;
35 hiwater_rss = total_rss = get_mm_rss(mm);
36 if (hiwater_rss < mm->hiwater_rss)
37 hiwater_rss = mm->hiwater_rss;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 data = mm->total_vm - mm->shared_vm - mm->stack_vm;
40 text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
41 lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
KAMEZAWA Hiroyukib084d432010-03-05 13:41:42 -080042 swap = get_mm_counter(mm, MM_SWAPENTS);
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080043 seq_printf(m,
Hugh Dickins365e9c872005-10-29 18:16:18 -070044 "VmPeak:\t%8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 "VmSize:\t%8lu kB\n"
46 "VmLck:\t%8lu kB\n"
Christoph Lameterbc3e53f2011-10-31 17:07:30 -070047 "VmPin:\t%8lu kB\n"
Hugh Dickins365e9c872005-10-29 18:16:18 -070048 "VmHWM:\t%8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 "VmRSS:\t%8lu kB\n"
50 "VmData:\t%8lu kB\n"
51 "VmStk:\t%8lu kB\n"
52 "VmExe:\t%8lu kB\n"
53 "VmLib:\t%8lu kB\n"
KAMEZAWA Hiroyukib084d432010-03-05 13:41:42 -080054 "VmPTE:\t%8lu kB\n"
55 "VmSwap:\t%8lu kB\n",
Hugh Dickins365e9c872005-10-29 18:16:18 -070056 hiwater_vm << (PAGE_SHIFT-10),
57 (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 mm->locked_vm << (PAGE_SHIFT-10),
Christoph Lameterbc3e53f2011-10-31 17:07:30 -070059 mm->pinned_vm << (PAGE_SHIFT-10),
Hugh Dickins365e9c872005-10-29 18:16:18 -070060 hiwater_rss << (PAGE_SHIFT-10),
61 total_rss << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 data << (PAGE_SHIFT-10),
63 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
KAMEZAWA Hiroyukib084d432010-03-05 13:41:42 -080064 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10,
65 swap << (PAGE_SHIFT-10));
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
67
68unsigned long task_vsize(struct mm_struct *mm)
69{
70 return PAGE_SIZE * mm->total_vm;
71}
72
Alexey Dobriyana2ade7b2011-01-12 17:00:32 -080073unsigned long task_statm(struct mm_struct *mm,
74 unsigned long *shared, unsigned long *text,
75 unsigned long *data, unsigned long *resident)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
KAMEZAWA Hiroyukid559db02010-03-05 13:41:39 -080077 *shared = get_mm_counter(mm, MM_FILEPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
79 >> PAGE_SHIFT;
80 *data = mm->total_vm - mm->shared_vm;
KAMEZAWA Hiroyukid559db02010-03-05 13:41:39 -080081 *resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 return mm->total_vm;
83}
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085static void pad_len_spaces(struct seq_file *m, int len)
86{
87 len = 25 + sizeof(void*) * 6 - len;
88 if (len < 1)
89 len = 1;
90 seq_printf(m, "%*c", len, ' ');
91}
92
Matt Mackalla6198792008-02-04 22:29:03 -080093static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
Mauricio Line070ad42005-09-03 15:55:10 -070094{
Matt Mackalla6198792008-02-04 22:29:03 -080095 if (vma && vma != priv->tail_vma) {
96 struct mm_struct *mm = vma->vm_mm;
97 up_read(&mm->mmap_sem);
98 mmput(mm);
99 }
100}
101
102static void *m_start(struct seq_file *m, loff_t *pos)
103{
104 struct proc_maps_private *priv = m->private;
105 unsigned long last_addr = m->version;
106 struct mm_struct *mm;
107 struct vm_area_struct *vma, *tail_vma = NULL;
108 loff_t l = *pos;
109
110 /* Clear the per syscall fields in priv */
111 priv->task = NULL;
112 priv->tail_vma = NULL;
113
114 /*
115 * We remember last_addr rather than next_addr to hit with
116 * mmap_cache most of the time. We have zero last_addr at
117 * the beginning and also after lseek. We will have -1 last_addr
118 * after the end of the vmas.
119 */
120
121 if (last_addr == -1UL)
122 return NULL;
123
124 priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
125 if (!priv->task)
Al Viroec6fd8a2011-02-15 22:22:54 -0500126 return ERR_PTR(-ESRCH);
Matt Mackalla6198792008-02-04 22:29:03 -0800127
128 mm = mm_for_maps(priv->task);
Al Viroec6fd8a2011-02-15 22:22:54 -0500129 if (!mm || IS_ERR(mm))
130 return mm;
Oleg Nesterov00f89d22009-07-10 03:27:38 +0200131 down_read(&mm->mmap_sem);
Matt Mackalla6198792008-02-04 22:29:03 -0800132
Stephen Wilson31db58b2011-03-13 15:49:15 -0400133 tail_vma = get_gate_vma(priv->task->mm);
Matt Mackalla6198792008-02-04 22:29:03 -0800134 priv->tail_vma = tail_vma;
135
136 /* Start with last addr hint */
137 vma = find_vma(mm, last_addr);
138 if (last_addr && vma) {
139 vma = vma->vm_next;
140 goto out;
141 }
142
143 /*
144 * Check the vma index is within the range and do
145 * sequential scan until m_index.
146 */
147 vma = NULL;
148 if ((unsigned long)l < mm->map_count) {
149 vma = mm->mmap;
150 while (l-- && vma)
151 vma = vma->vm_next;
152 goto out;
153 }
154
155 if (l != mm->map_count)
156 tail_vma = NULL; /* After gate vma */
157
158out:
159 if (vma)
160 return vma;
161
162 /* End of vmas has been reached */
163 m->version = (tail_vma != NULL)? 0: -1UL;
164 up_read(&mm->mmap_sem);
165 mmput(mm);
166 return tail_vma;
167}
168
169static void *m_next(struct seq_file *m, void *v, loff_t *pos)
170{
171 struct proc_maps_private *priv = m->private;
172 struct vm_area_struct *vma = v;
173 struct vm_area_struct *tail_vma = priv->tail_vma;
174
175 (*pos)++;
176 if (vma && (vma != tail_vma) && vma->vm_next)
177 return vma->vm_next;
178 vma_stop(priv, vma);
179 return (vma != tail_vma)? tail_vma: NULL;
180}
181
182static void m_stop(struct seq_file *m, void *v)
183{
184 struct proc_maps_private *priv = m->private;
185 struct vm_area_struct *vma = v;
186
Linus Torvalds76597cd2011-03-27 19:09:29 -0700187 if (!IS_ERR(vma))
188 vma_stop(priv, vma);
Matt Mackalla6198792008-02-04 22:29:03 -0800189 if (priv->task)
190 put_task_struct(priv->task);
191}
192
193static int do_maps_open(struct inode *inode, struct file *file,
Jan Engelhardt03a44822008-02-08 04:21:19 -0800194 const struct seq_operations *ops)
Matt Mackalla6198792008-02-04 22:29:03 -0800195{
196 struct proc_maps_private *priv;
197 int ret = -ENOMEM;
198 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
199 if (priv) {
200 priv->pid = proc_pid(inode);
201 ret = seq_open(file, ops);
202 if (!ret) {
203 struct seq_file *m = file->private_data;
204 m->private = priv;
205 } else {
206 kfree(priv);
207 }
208 }
209 return ret;
210}
Mauricio Line070ad42005-09-03 15:55:10 -0700211
Joe Korty7c88db02008-10-16 15:27:09 +0400212static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213{
Mauricio Line070ad42005-09-03 15:55:10 -0700214 struct mm_struct *mm = vma->vm_mm;
215 struct file *file = vma->vm_file;
KOSAKI Motohiroca16d142011-05-26 19:16:19 +0900216 vm_flags_t flags = vma->vm_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 unsigned long ino = 0;
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700218 unsigned long long pgoff = 0;
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200219 unsigned long start, end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 dev_t dev = 0;
221 int len;
222
223 if (file) {
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800224 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 dev = inode->i_sb->s_dev;
226 ino = inode->i_ino;
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700227 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
229
Linus Torvaldsd7824372010-08-15 11:35:52 -0700230 /* We don't show the stack guard page in /proc/maps */
231 start = vma->vm_start;
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200232 if (stack_guard_page_start(vma, start))
233 start += PAGE_SIZE;
234 end = vma->vm_end;
235 if (stack_guard_page_end(vma, end))
236 end -= PAGE_SIZE;
Linus Torvaldsd7824372010-08-15 11:35:52 -0700237
Clement Calmels1804dc62008-08-20 14:09:00 -0700238 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
Linus Torvaldsd7824372010-08-15 11:35:52 -0700239 start,
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200240 end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 flags & VM_READ ? 'r' : '-',
242 flags & VM_WRITE ? 'w' : '-',
243 flags & VM_EXEC ? 'x' : '-',
244 flags & VM_MAYSHARE ? 's' : 'p',
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700245 pgoff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 MAJOR(dev), MINOR(dev), ino, &len);
247
248 /*
249 * Print the dentry name for named mappings, and a
250 * special [heap] marker for the heap:
251 */
Mauricio Line070ad42005-09-03 15:55:10 -0700252 if (file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 pad_len_spaces(m, len);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800254 seq_path(m, &file->f_path, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 } else {
Ingo Molnare6e54942006-06-27 02:53:50 -0700256 const char *name = arch_vma_name(vma);
257 if (!name) {
258 if (mm) {
Aaro Koskinen0db0c012011-03-23 16:42:50 -0700259 if (vma->vm_start <= mm->brk &&
260 vma->vm_end >= mm->start_brk) {
Ingo Molnare6e54942006-06-27 02:53:50 -0700261 name = "[heap]";
262 } else if (vma->vm_start <= mm->start_stack &&
263 vma->vm_end >= mm->start_stack) {
264 name = "[stack]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 }
Ingo Molnare6e54942006-06-27 02:53:50 -0700266 } else {
267 name = "[vdso]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
Ingo Molnare6e54942006-06-27 02:53:50 -0700269 }
270 if (name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 pad_len_spaces(m, len);
Ingo Molnare6e54942006-06-27 02:53:50 -0700272 seq_puts(m, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
274 }
275 seq_putc(m, '\n');
Joe Korty7c88db02008-10-16 15:27:09 +0400276}
277
278static int show_map(struct seq_file *m, void *v)
279{
280 struct vm_area_struct *vma = v;
281 struct proc_maps_private *priv = m->private;
282 struct task_struct *task = priv->task;
283
284 show_map_vma(m, vma);
Mauricio Line070ad42005-09-03 15:55:10 -0700285
Mauricio Line070ad42005-09-03 15:55:10 -0700286 if (m->count < m->size) /* vma is copied successfully */
Stephen Wilson31db58b2011-03-13 15:49:15 -0400287 m->version = (vma != get_gate_vma(task->mm))
288 ? vma->vm_start : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 return 0;
290}
291
Jan Engelhardt03a44822008-02-08 04:21:19 -0800292static const struct seq_operations proc_pid_maps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800293 .start = m_start,
294 .next = m_next,
295 .stop = m_stop,
296 .show = show_map
297};
298
299static int maps_open(struct inode *inode, struct file *file)
300{
301 return do_maps_open(inode, file, &proc_pid_maps_op);
302}
303
304const struct file_operations proc_maps_operations = {
305 .open = maps_open,
306 .read = seq_read,
307 .llseek = seq_lseek,
308 .release = seq_release_private,
309};
310
311/*
312 * Proportional Set Size(PSS): my share of RSS.
313 *
314 * PSS of a process is the count of pages it has in memory, where each
315 * page is divided by the number of processes sharing it. So if a
316 * process has 1000 pages all to itself, and 1000 shared with one other
317 * process, its PSS will be 1500.
318 *
319 * To keep (accumulated) division errors low, we adopt a 64bit
320 * fixed-point pss counter to minimize division errors. So (pss >>
321 * PSS_SHIFT) would be the real byte count.
322 *
323 * A shift of 12 before division means (assuming 4K page size):
324 * - 1M 3-user-pages add up to 8KB errors;
325 * - supports mapcount up to 2^24, or 16M;
326 * - supports PSS up to 2^52 bytes, or 4PB.
327 */
328#define PSS_SHIFT 12
329
Matt Mackall1e883282008-02-04 22:29:07 -0800330#ifdef CONFIG_PROC_PAGE_MONITOR
Peter Zijlstra214e4712008-04-28 02:12:55 -0700331struct mem_size_stats {
Matt Mackalla6198792008-02-04 22:29:03 -0800332 struct vm_area_struct *vma;
333 unsigned long resident;
334 unsigned long shared_clean;
335 unsigned long shared_dirty;
336 unsigned long private_clean;
337 unsigned long private_dirty;
338 unsigned long referenced;
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700339 unsigned long anonymous;
Dave Hansen4031a212011-03-22 16:33:01 -0700340 unsigned long anonymous_thp;
Peter Zijlstra214e4712008-04-28 02:12:55 -0700341 unsigned long swap;
Matt Mackalla6198792008-02-04 22:29:03 -0800342 u64 pss;
343};
344
Dave Hansenae11c4d2011-03-22 16:32:58 -0700345
346static void smaps_pte_entry(pte_t ptent, unsigned long addr,
Dave Hansen3c9acc72011-03-22 16:32:59 -0700347 unsigned long ptent_size, struct mm_walk *walk)
Dave Hansenae11c4d2011-03-22 16:32:58 -0700348{
349 struct mem_size_stats *mss = walk->private;
350 struct vm_area_struct *vma = mss->vma;
351 struct page *page;
352 int mapcount;
353
354 if (is_swap_pte(ptent)) {
Dave Hansen3c9acc72011-03-22 16:32:59 -0700355 mss->swap += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700356 return;
357 }
358
359 if (!pte_present(ptent))
360 return;
361
362 page = vm_normal_page(vma, addr, ptent);
363 if (!page)
364 return;
365
366 if (PageAnon(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700367 mss->anonymous += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700368
Dave Hansen3c9acc72011-03-22 16:32:59 -0700369 mss->resident += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700370 /* Accumulate the size in pages that have been accessed. */
371 if (pte_young(ptent) || PageReferenced(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700372 mss->referenced += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700373 mapcount = page_mapcount(page);
374 if (mapcount >= 2) {
375 if (pte_dirty(ptent) || PageDirty(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700376 mss->shared_dirty += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700377 else
Dave Hansen3c9acc72011-03-22 16:32:59 -0700378 mss->shared_clean += ptent_size;
379 mss->pss += (ptent_size << PSS_SHIFT) / mapcount;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700380 } else {
381 if (pte_dirty(ptent) || PageDirty(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700382 mss->private_dirty += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700383 else
Dave Hansen3c9acc72011-03-22 16:32:59 -0700384 mss->private_clean += ptent_size;
385 mss->pss += (ptent_size << PSS_SHIFT);
Dave Hansenae11c4d2011-03-22 16:32:58 -0700386 }
387}
388
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800389static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700390 struct mm_walk *walk)
Mauricio Line070ad42005-09-03 15:55:10 -0700391{
Dave Hansen21650092008-06-12 15:21:47 -0700392 struct mem_size_stats *mss = walk->private;
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800393 struct vm_area_struct *vma = mss->vma;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700394 pte_t *pte;
Hugh Dickins705e87c2005-10-29 18:16:27 -0700395 spinlock_t *ptl;
Mauricio Line070ad42005-09-03 15:55:10 -0700396
Dave Hansen22e057c2011-03-22 16:33:00 -0700397 spin_lock(&walk->mm->page_table_lock);
398 if (pmd_trans_huge(*pmd)) {
399 if (pmd_trans_splitting(*pmd)) {
400 spin_unlock(&walk->mm->page_table_lock);
401 wait_split_huge_page(vma->anon_vma, pmd);
402 } else {
403 smaps_pte_entry(*(pte_t *)pmd, addr,
404 HPAGE_PMD_SIZE, walk);
405 spin_unlock(&walk->mm->page_table_lock);
Dave Hansen4031a212011-03-22 16:33:01 -0700406 mss->anonymous_thp += HPAGE_PMD_SIZE;
Dave Hansen22e057c2011-03-22 16:33:00 -0700407 return 0;
408 }
409 } else {
410 spin_unlock(&walk->mm->page_table_lock);
411 }
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700412
413 if (pmd_trans_unstable(pmd))
414 return 0;
Dave Hansen22e057c2011-03-22 16:33:00 -0700415 /*
416 * The mmap_sem held all the way back in m_start() is what
417 * keeps khugepaged out of here and from collapsing things
418 * in here.
419 */
Hugh Dickins705e87c2005-10-29 18:16:27 -0700420 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
Dave Hansenae11c4d2011-03-22 16:32:58 -0700421 for (; addr != end; pte++, addr += PAGE_SIZE)
Dave Hansen3c9acc72011-03-22 16:32:59 -0700422 smaps_pte_entry(*pte, addr, PAGE_SIZE, walk);
Hugh Dickins705e87c2005-10-29 18:16:27 -0700423 pte_unmap_unlock(pte - 1, ptl);
424 cond_resched();
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800425 return 0;
Mauricio Line070ad42005-09-03 15:55:10 -0700426}
427
Mauricio Line070ad42005-09-03 15:55:10 -0700428static int show_smap(struct seq_file *m, void *v)
429{
Joe Korty7c88db02008-10-16 15:27:09 +0400430 struct proc_maps_private *priv = m->private;
431 struct task_struct *task = priv->task;
Mauricio Line070ad42005-09-03 15:55:10 -0700432 struct vm_area_struct *vma = v;
Mauricio Line070ad42005-09-03 15:55:10 -0700433 struct mem_size_stats mss;
Dave Hansen21650092008-06-12 15:21:47 -0700434 struct mm_walk smaps_walk = {
435 .pmd_entry = smaps_pte_range,
436 .mm = vma->vm_mm,
437 .private = &mss,
438 };
Mauricio Line070ad42005-09-03 15:55:10 -0700439
440 memset(&mss, 0, sizeof mss);
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800441 mss.vma = vma;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900442 /* mmap_sem is held in m_start */
Nick Piggin5ddfae12006-03-06 15:42:57 -0800443 if (vma->vm_mm && !is_vm_hugetlb_page(vma))
Dave Hansen21650092008-06-12 15:21:47 -0700444 walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
Matt Mackall4752c362008-02-04 22:29:02 -0800445
Joe Korty7c88db02008-10-16 15:27:09 +0400446 show_map_vma(m, vma);
Matt Mackall4752c362008-02-04 22:29:02 -0800447
448 seq_printf(m,
449 "Size: %8lu kB\n"
450 "Rss: %8lu kB\n"
451 "Pss: %8lu kB\n"
452 "Shared_Clean: %8lu kB\n"
453 "Shared_Dirty: %8lu kB\n"
454 "Private_Clean: %8lu kB\n"
455 "Private_Dirty: %8lu kB\n"
Peter Zijlstra214e4712008-04-28 02:12:55 -0700456 "Referenced: %8lu kB\n"
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700457 "Anonymous: %8lu kB\n"
Dave Hansen4031a212011-03-22 16:33:01 -0700458 "AnonHugePages: %8lu kB\n"
Mel Gorman08fba692009-01-06 14:38:53 -0800459 "Swap: %8lu kB\n"
Mel Gorman33402892009-01-06 14:38:54 -0800460 "KernelPageSize: %8lu kB\n"
Nikanth Karthikesan2d905082011-01-13 15:45:53 -0800461 "MMUPageSize: %8lu kB\n"
462 "Locked: %8lu kB\n",
Matt Mackall4752c362008-02-04 22:29:02 -0800463 (vma->vm_end - vma->vm_start) >> 10,
464 mss.resident >> 10,
465 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
466 mss.shared_clean >> 10,
467 mss.shared_dirty >> 10,
468 mss.private_clean >> 10,
469 mss.private_dirty >> 10,
Peter Zijlstra214e4712008-04-28 02:12:55 -0700470 mss.referenced >> 10,
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700471 mss.anonymous >> 10,
Dave Hansen4031a212011-03-22 16:33:01 -0700472 mss.anonymous_thp >> 10,
Mel Gorman08fba692009-01-06 14:38:53 -0800473 mss.swap >> 10,
Mel Gorman33402892009-01-06 14:38:54 -0800474 vma_kernel_pagesize(vma) >> 10,
Nikanth Karthikesan2d905082011-01-13 15:45:53 -0800475 vma_mmu_pagesize(vma) >> 10,
476 (vma->vm_flags & VM_LOCKED) ?
477 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
Matt Mackall4752c362008-02-04 22:29:02 -0800478
Joe Korty7c88db02008-10-16 15:27:09 +0400479 if (m->count < m->size) /* vma is copied successfully */
Stephen Wilson31db58b2011-03-13 15:49:15 -0400480 m->version = (vma != get_gate_vma(task->mm))
481 ? vma->vm_start : 0;
Joe Korty7c88db02008-10-16 15:27:09 +0400482 return 0;
Mauricio Line070ad42005-09-03 15:55:10 -0700483}
484
Jan Engelhardt03a44822008-02-08 04:21:19 -0800485static const struct seq_operations proc_pid_smaps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800486 .start = m_start,
487 .next = m_next,
488 .stop = m_stop,
489 .show = show_smap
490};
491
492static int smaps_open(struct inode *inode, struct file *file)
493{
494 return do_maps_open(inode, file, &proc_pid_smaps_op);
495}
496
497const struct file_operations proc_smaps_operations = {
498 .open = smaps_open,
499 .read = seq_read,
500 .llseek = seq_lseek,
501 .release = seq_release_private,
502};
503
504static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
Dave Hansen21650092008-06-12 15:21:47 -0700505 unsigned long end, struct mm_walk *walk)
Matt Mackalla6198792008-02-04 22:29:03 -0800506{
Dave Hansen21650092008-06-12 15:21:47 -0700507 struct vm_area_struct *vma = walk->private;
Matt Mackalla6198792008-02-04 22:29:03 -0800508 pte_t *pte, ptent;
509 spinlock_t *ptl;
510 struct page *page;
511
Dave Hansen03319322011-03-22 16:32:56 -0700512 split_huge_page_pmd(walk->mm, pmd);
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700513 if (pmd_trans_unstable(pmd))
514 return 0;
Dave Hansen03319322011-03-22 16:32:56 -0700515
Matt Mackalla6198792008-02-04 22:29:03 -0800516 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
517 for (; addr != end; pte++, addr += PAGE_SIZE) {
518 ptent = *pte;
519 if (!pte_present(ptent))
520 continue;
521
522 page = vm_normal_page(vma, addr, ptent);
523 if (!page)
524 continue;
525
Will Deacon85e72aa2012-01-20 14:34:09 -0800526 if (PageReserved(page))
527 continue;
528
Matt Mackalla6198792008-02-04 22:29:03 -0800529 /* Clear accessed and referenced bits. */
530 ptep_test_and_clear_young(vma, addr, pte);
531 ClearPageReferenced(page);
532 }
533 pte_unmap_unlock(pte - 1, ptl);
534 cond_resched();
535 return 0;
536}
537
Moussa A. Ba398499d2009-09-21 17:02:29 -0700538#define CLEAR_REFS_ALL 1
539#define CLEAR_REFS_ANON 2
540#define CLEAR_REFS_MAPPED 3
541
Matt Mackallf248dcb2008-02-04 22:29:03 -0800542static ssize_t clear_refs_write(struct file *file, const char __user *buf,
543 size_t count, loff_t *ppos)
David Rientjesb813e932007-05-06 14:49:24 -0700544{
Matt Mackallf248dcb2008-02-04 22:29:03 -0800545 struct task_struct *task;
Vincent Lifb92a4b2009-09-22 16:45:36 -0700546 char buffer[PROC_NUMBUF];
Matt Mackallf248dcb2008-02-04 22:29:03 -0800547 struct mm_struct *mm;
David Rientjesb813e932007-05-06 14:49:24 -0700548 struct vm_area_struct *vma;
Alexey Dobriyan0a8cb8e2011-05-26 16:25:50 -0700549 int type;
550 int rv;
David Rientjesb813e932007-05-06 14:49:24 -0700551
Matt Mackallf248dcb2008-02-04 22:29:03 -0800552 memset(buffer, 0, sizeof(buffer));
553 if (count > sizeof(buffer) - 1)
554 count = sizeof(buffer) - 1;
555 if (copy_from_user(buffer, buf, count))
556 return -EFAULT;
Alexey Dobriyan0a8cb8e2011-05-26 16:25:50 -0700557 rv = kstrtoint(strstrip(buffer), 10, &type);
558 if (rv < 0)
559 return rv;
Moussa A. Ba398499d2009-09-21 17:02:29 -0700560 if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
Matt Mackallf248dcb2008-02-04 22:29:03 -0800561 return -EINVAL;
Matt Mackallf248dcb2008-02-04 22:29:03 -0800562 task = get_proc_task(file->f_path.dentry->d_inode);
563 if (!task)
564 return -ESRCH;
565 mm = get_task_mm(task);
566 if (mm) {
Andrew Morton20cbc972008-07-05 12:29:05 -0700567 struct mm_walk clear_refs_walk = {
568 .pmd_entry = clear_refs_pte_range,
569 .mm = mm,
570 };
Matt Mackallf248dcb2008-02-04 22:29:03 -0800571 down_read(&mm->mmap_sem);
Dave Hansen21650092008-06-12 15:21:47 -0700572 for (vma = mm->mmap; vma; vma = vma->vm_next) {
573 clear_refs_walk.private = vma;
Moussa A. Ba398499d2009-09-21 17:02:29 -0700574 if (is_vm_hugetlb_page(vma))
575 continue;
576 /*
577 * Writing 1 to /proc/pid/clear_refs affects all pages.
578 *
579 * Writing 2 to /proc/pid/clear_refs only affects
580 * Anonymous pages.
581 *
582 * Writing 3 to /proc/pid/clear_refs only affects file
583 * mapped pages.
584 */
585 if (type == CLEAR_REFS_ANON && vma->vm_file)
586 continue;
587 if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
588 continue;
589 walk_page_range(vma->vm_start, vma->vm_end,
590 &clear_refs_walk);
Dave Hansen21650092008-06-12 15:21:47 -0700591 }
Matt Mackallf248dcb2008-02-04 22:29:03 -0800592 flush_tlb_mm(mm);
593 up_read(&mm->mmap_sem);
594 mmput(mm);
595 }
596 put_task_struct(task);
Vincent Lifb92a4b2009-09-22 16:45:36 -0700597
598 return count;
David Rientjesb813e932007-05-06 14:49:24 -0700599}
600
Matt Mackallf248dcb2008-02-04 22:29:03 -0800601const struct file_operations proc_clear_refs_operations = {
602 .write = clear_refs_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200603 .llseek = noop_llseek,
Matt Mackallf248dcb2008-02-04 22:29:03 -0800604};
605
Matt Mackall85863e42008-02-04 22:29:04 -0800606struct pagemapread {
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900607 int pos, len;
608 u64 *buffer;
Matt Mackall85863e42008-02-04 22:29:04 -0800609};
610
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500611#define PM_ENTRY_BYTES sizeof(u64)
612#define PM_STATUS_BITS 3
613#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
614#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
615#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
616#define PM_PSHIFT_BITS 6
617#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
618#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
619#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
620#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
621#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
622
623#define PM_PRESENT PM_STATUS(4LL)
624#define PM_SWAP PM_STATUS(2LL)
625#define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT)
Matt Mackall85863e42008-02-04 22:29:04 -0800626#define PM_END_OF_BUFFER 1
627
628static int add_to_pagemap(unsigned long addr, u64 pfn,
629 struct pagemapread *pm)
630{
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900631 pm->buffer[pm->pos++] = pfn;
632 if (pm->pos >= pm->len)
Thomas Tuttleaae86792008-06-05 22:46:31 -0700633 return PM_END_OF_BUFFER;
Matt Mackall85863e42008-02-04 22:29:04 -0800634 return 0;
635}
636
637static int pagemap_pte_hole(unsigned long start, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700638 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800639{
Dave Hansen21650092008-06-12 15:21:47 -0700640 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800641 unsigned long addr;
642 int err = 0;
643 for (addr = start; addr < end; addr += PAGE_SIZE) {
644 err = add_to_pagemap(addr, PM_NOT_PRESENT, pm);
645 if (err)
646 break;
647 }
648 return err;
649}
650
Adrian Bunk9d02dbc2008-04-28 02:12:11 -0700651static u64 swap_pte_to_pagemap_entry(pte_t pte)
Matt Mackall85863e42008-02-04 22:29:04 -0800652{
653 swp_entry_t e = pte_to_swp_entry(pte);
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500654 return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT);
Matt Mackall85863e42008-02-04 22:29:04 -0800655}
656
Matt Mackall49c50342008-12-09 13:14:21 -0800657static u64 pte_to_pagemap_entry(pte_t pte)
Dave Hansenbcf80392008-06-12 15:21:48 -0700658{
Matt Mackall49c50342008-12-09 13:14:21 -0800659 u64 pme = 0;
Dave Hansenbcf80392008-06-12 15:21:48 -0700660 if (is_swap_pte(pte))
661 pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte))
662 | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP;
663 else if (pte_present(pte))
664 pme = PM_PFRAME(pte_pfn(pte))
665 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
666 return pme;
667}
668
Matt Mackall85863e42008-02-04 22:29:04 -0800669static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700670 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800671{
Dave Hansenbcf80392008-06-12 15:21:48 -0700672 struct vm_area_struct *vma;
Dave Hansen21650092008-06-12 15:21:47 -0700673 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800674 pte_t *pte;
675 int err = 0;
676
Dave Hansen03319322011-03-22 16:32:56 -0700677 split_huge_page_pmd(walk->mm, pmd);
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700678 if (pmd_trans_unstable(pmd))
679 return 0;
Dave Hansen03319322011-03-22 16:32:56 -0700680
Dave Hansenbcf80392008-06-12 15:21:48 -0700681 /* find the first VMA at or above 'addr' */
682 vma = find_vma(walk->mm, addr);
Matt Mackall85863e42008-02-04 22:29:04 -0800683 for (; addr != end; addr += PAGE_SIZE) {
684 u64 pfn = PM_NOT_PRESENT;
Dave Hansenbcf80392008-06-12 15:21:48 -0700685
686 /* check to see if we've left 'vma' behind
687 * and need a new, higher one */
688 if (vma && (addr >= vma->vm_end))
689 vma = find_vma(walk->mm, addr);
690
691 /* check that 'vma' actually covers this address,
692 * and that it isn't a huge page vma */
693 if (vma && (vma->vm_start <= addr) &&
694 !is_vm_hugetlb_page(vma)) {
695 pte = pte_offset_map(pmd, addr);
696 pfn = pte_to_pagemap_entry(*pte);
697 /* unmap before userspace copy */
698 pte_unmap(pte);
699 }
Matt Mackall85863e42008-02-04 22:29:04 -0800700 err = add_to_pagemap(addr, pfn, pm);
701 if (err)
702 return err;
703 }
704
705 cond_resched();
706
707 return err;
708}
709
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700710#ifdef CONFIG_HUGETLB_PAGE
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800711static u64 huge_pte_to_pagemap_entry(pte_t pte, int offset)
712{
713 u64 pme = 0;
714 if (pte_present(pte))
715 pme = PM_PFRAME(pte_pfn(pte) + offset)
716 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
717 return pme;
718}
719
Naoya Horiguchi116354d2010-04-06 14:35:04 -0700720/* This function walks within one hugetlb entry in the single call */
721static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
722 unsigned long addr, unsigned long end,
723 struct mm_walk *walk)
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800724{
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800725 struct pagemapread *pm = walk->private;
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800726 int err = 0;
Naoya Horiguchi116354d2010-04-06 14:35:04 -0700727 u64 pfn;
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800728
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800729 for (; addr != end; addr += PAGE_SIZE) {
Naoya Horiguchi116354d2010-04-06 14:35:04 -0700730 int offset = (addr & ~hmask) >> PAGE_SHIFT;
731 pfn = huge_pte_to_pagemap_entry(*pte, offset);
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800732 err = add_to_pagemap(addr, pfn, pm);
733 if (err)
734 return err;
735 }
736
737 cond_resched();
738
739 return err;
740}
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700741#endif /* HUGETLB_PAGE */
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800742
Matt Mackall85863e42008-02-04 22:29:04 -0800743/*
744 * /proc/pid/pagemap - an array mapping virtual pages to pfns
745 *
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500746 * For each page in the address space, this file contains one 64-bit entry
747 * consisting of the following:
748 *
749 * Bits 0-55 page frame number (PFN) if present
750 * Bits 0-4 swap type if swapped
751 * Bits 5-55 swap offset if swapped
752 * Bits 55-60 page shift (page size = 1<<page shift)
753 * Bit 61 reserved for future use
754 * Bit 62 page swapped
755 * Bit 63 page present
756 *
757 * If the page is not present but in swap, then the PFN contains an
758 * encoding of the swap file number and the page's offset into the
759 * swap. Unmapped pages return a null PFN. This allows determining
Matt Mackall85863e42008-02-04 22:29:04 -0800760 * precisely which pages are mapped (or in swap) and comparing mapped
761 * pages between processes.
762 *
763 * Efficient users of this interface will use /proc/pid/maps to
764 * determine which areas of memory are actually mapped and llseek to
765 * skip over unmapped regions.
766 */
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900767#define PAGEMAP_WALK_SIZE (PMD_SIZE)
Naoya Horiguchiea251c12010-11-24 12:57:13 -0800768#define PAGEMAP_WALK_MASK (PMD_MASK)
Matt Mackall85863e42008-02-04 22:29:04 -0800769static ssize_t pagemap_read(struct file *file, char __user *buf,
770 size_t count, loff_t *ppos)
771{
772 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Matt Mackall85863e42008-02-04 22:29:04 -0800773 struct mm_struct *mm;
774 struct pagemapread pm;
Matt Mackall85863e42008-02-04 22:29:04 -0800775 int ret = -ESRCH;
Alexey Dobriyanee1e6ab2008-07-21 14:21:36 -0700776 struct mm_walk pagemap_walk = {};
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700777 unsigned long src;
778 unsigned long svpfn;
779 unsigned long start_vaddr;
780 unsigned long end_vaddr;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900781 int copied = 0;
Matt Mackall85863e42008-02-04 22:29:04 -0800782
783 if (!task)
784 goto out;
785
Matt Mackall85863e42008-02-04 22:29:04 -0800786 ret = -EINVAL;
787 /* file position must be aligned */
Thomas Tuttleaae86792008-06-05 22:46:31 -0700788 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
Marcelo Tosattifb393802008-03-13 12:32:35 -0700789 goto out_task;
Matt Mackall85863e42008-02-04 22:29:04 -0800790
791 ret = 0;
Vitaly Mayatskikh08161782009-04-30 15:08:18 -0700792 if (!count)
793 goto out_task;
794
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900795 pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
796 pm.buffer = kmalloc(pm.len, GFP_TEMPORARY);
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700797 ret = -ENOMEM;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900798 if (!pm.buffer)
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700799 goto out_task;
800
801 mm = mm_for_maps(task);
802 ret = PTR_ERR(mm);
803 if (!mm || IS_ERR(mm))
804 goto out_free;
Matt Mackall85863e42008-02-04 22:29:04 -0800805
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700806 pagemap_walk.pmd_entry = pagemap_pte_range;
807 pagemap_walk.pte_hole = pagemap_pte_hole;
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700808#ifdef CONFIG_HUGETLB_PAGE
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800809 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700810#endif
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700811 pagemap_walk.mm = mm;
812 pagemap_walk.private = &pm;
Matt Mackall85863e42008-02-04 22:29:04 -0800813
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700814 src = *ppos;
815 svpfn = src / PM_ENTRY_BYTES;
816 start_vaddr = svpfn << PAGE_SHIFT;
817 end_vaddr = TASK_SIZE_OF(task);
Matt Mackall85863e42008-02-04 22:29:04 -0800818
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700819 /* watch out for wraparound */
820 if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
821 start_vaddr = end_vaddr;
822
823 /*
824 * The odds are that this will stop walking way
825 * before end_vaddr, because the length of the
826 * user buffer is tracked in "pm", and the walk
827 * will stop when we hit the end of the buffer.
828 */
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900829 ret = 0;
830 while (count && (start_vaddr < end_vaddr)) {
831 int len;
832 unsigned long end;
Matt Mackall85863e42008-02-04 22:29:04 -0800833
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900834 pm.pos = 0;
Naoya Horiguchiea251c12010-11-24 12:57:13 -0800835 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900836 /* overflow ? */
837 if (end < start_vaddr || end > end_vaddr)
838 end = end_vaddr;
839 down_read(&mm->mmap_sem);
840 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
841 up_read(&mm->mmap_sem);
842 start_vaddr = end;
843
844 len = min(count, PM_ENTRY_BYTES * pm.pos);
Dan Carpenter309361e02010-04-06 13:45:39 +0300845 if (copy_to_user(buf, pm.buffer, len)) {
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900846 ret = -EFAULT;
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700847 goto out_mm;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900848 }
849 copied += len;
850 buf += len;
851 count -= len;
Matt Mackall85863e42008-02-04 22:29:04 -0800852 }
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900853 *ppos += copied;
854 if (!ret || ret == PM_END_OF_BUFFER)
855 ret = copied;
856
Marcelo Tosattifb393802008-03-13 12:32:35 -0700857out_mm:
858 mmput(mm);
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700859out_free:
860 kfree(pm.buffer);
Matt Mackall85863e42008-02-04 22:29:04 -0800861out_task:
862 put_task_struct(task);
863out:
864 return ret;
865}
866
867const struct file_operations proc_pagemap_operations = {
868 .llseek = mem_lseek, /* borrow this */
869 .read = pagemap_read,
870};
Matt Mackall1e883282008-02-04 22:29:07 -0800871#endif /* CONFIG_PROC_PAGE_MONITOR */
Matt Mackall85863e42008-02-04 22:29:04 -0800872
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700873#ifdef CONFIG_NUMA
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700874
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700875struct numa_maps {
876 struct vm_area_struct *vma;
877 unsigned long pages;
878 unsigned long anon;
879 unsigned long active;
880 unsigned long writeback;
881 unsigned long mapcount_max;
882 unsigned long dirty;
883 unsigned long swapcache;
884 unsigned long node[MAX_NUMNODES];
885};
886
Stephen Wilson5b52fc82011-05-24 17:12:49 -0700887struct numa_maps_private {
888 struct proc_maps_private proc_maps;
889 struct numa_maps md;
890};
891
Dave Hanseneb4866d2011-09-20 15:19:38 -0700892static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
893 unsigned long nr_pages)
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700894{
895 int count = page_mapcount(page);
896
Dave Hanseneb4866d2011-09-20 15:19:38 -0700897 md->pages += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700898 if (pte_dirty || PageDirty(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -0700899 md->dirty += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700900
901 if (PageSwapCache(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -0700902 md->swapcache += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700903
904 if (PageActive(page) || PageUnevictable(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -0700905 md->active += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700906
907 if (PageWriteback(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -0700908 md->writeback += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700909
910 if (PageAnon(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -0700911 md->anon += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700912
913 if (count > md->mapcount_max)
914 md->mapcount_max = count;
915
Dave Hanseneb4866d2011-09-20 15:19:38 -0700916 md->node[page_to_nid(page)] += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700917}
918
Dave Hansen3200a8a2011-09-20 15:19:39 -0700919static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
920 unsigned long addr)
921{
922 struct page *page;
923 int nid;
924
925 if (!pte_present(pte))
926 return NULL;
927
928 page = vm_normal_page(vma, addr, pte);
929 if (!page)
930 return NULL;
931
932 if (PageReserved(page))
933 return NULL;
934
935 nid = page_to_nid(page);
936 if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
937 return NULL;
938
939 return page;
940}
941
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700942static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
943 unsigned long end, struct mm_walk *walk)
944{
945 struct numa_maps *md;
946 spinlock_t *ptl;
947 pte_t *orig_pte;
948 pte_t *pte;
949
950 md = walk->private;
Dave Hansen32ef4382011-09-20 15:19:41 -0700951 spin_lock(&walk->mm->page_table_lock);
952 if (pmd_trans_huge(*pmd)) {
953 if (pmd_trans_splitting(*pmd)) {
954 spin_unlock(&walk->mm->page_table_lock);
955 wait_split_huge_page(md->vma->anon_vma, pmd);
956 } else {
957 pte_t huge_pte = *(pte_t *)pmd;
958 struct page *page;
959
960 page = can_gather_numa_stats(huge_pte, md->vma, addr);
961 if (page)
962 gather_stats(page, md, pte_dirty(huge_pte),
963 HPAGE_PMD_SIZE/PAGE_SIZE);
964 spin_unlock(&walk->mm->page_table_lock);
965 return 0;
966 }
967 } else {
968 spin_unlock(&walk->mm->page_table_lock);
969 }
970
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700971 if (pmd_trans_unstable(pmd))
972 return 0;
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700973 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
974 do {
Dave Hansen3200a8a2011-09-20 15:19:39 -0700975 struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700976 if (!page)
977 continue;
Dave Hanseneb4866d2011-09-20 15:19:38 -0700978 gather_stats(page, md, pte_dirty(*pte), 1);
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700979
980 } while (pte++, addr += PAGE_SIZE, addr != end);
981 pte_unmap_unlock(orig_pte, ptl);
982 return 0;
983}
984#ifdef CONFIG_HUGETLB_PAGE
985static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
986 unsigned long addr, unsigned long end, struct mm_walk *walk)
987{
988 struct numa_maps *md;
989 struct page *page;
990
991 if (pte_none(*pte))
992 return 0;
993
994 page = pte_page(*pte);
995 if (!page)
996 return 0;
997
998 md = walk->private;
Dave Hanseneb4866d2011-09-20 15:19:38 -0700999 gather_stats(page, md, pte_dirty(*pte), 1);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001000 return 0;
1001}
1002
1003#else
1004static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
1005 unsigned long addr, unsigned long end, struct mm_walk *walk)
1006{
1007 return 0;
1008}
1009#endif
1010
1011/*
1012 * Display pages allocated per node and memory policy via /proc.
1013 */
1014static int show_numa_map(struct seq_file *m, void *v)
1015{
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001016 struct numa_maps_private *numa_priv = m->private;
1017 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001018 struct vm_area_struct *vma = v;
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001019 struct numa_maps *md = &numa_priv->md;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001020 struct file *file = vma->vm_file;
1021 struct mm_struct *mm = vma->vm_mm;
1022 struct mm_walk walk = {};
1023 struct mempolicy *pol;
1024 int n;
1025 char buffer[50];
1026
1027 if (!mm)
1028 return 0;
1029
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001030 /* Ensure we start with an empty set of numa_maps statistics. */
1031 memset(md, 0, sizeof(*md));
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001032
1033 md->vma = vma;
1034
1035 walk.hugetlb_entry = gather_hugetbl_stats;
1036 walk.pmd_entry = gather_pte_stats;
1037 walk.private = md;
1038 walk.mm = mm;
1039
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001040 pol = get_vma_policy(proc_priv->task, vma, vma->vm_start);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001041 mpol_to_str(buffer, sizeof(buffer), pol, 0);
1042 mpol_cond_put(pol);
1043
1044 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1045
1046 if (file) {
1047 seq_printf(m, " file=");
1048 seq_path(m, &file->f_path, "\n\t= ");
1049 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1050 seq_printf(m, " heap");
1051 } else if (vma->vm_start <= mm->start_stack &&
1052 vma->vm_end >= mm->start_stack) {
1053 seq_printf(m, " stack");
1054 }
1055
Andrew Mortonfc360bd2011-10-31 17:06:32 -07001056 if (is_vm_hugetlb_page(vma))
1057 seq_printf(m, " huge");
1058
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001059 walk_page_range(vma->vm_start, vma->vm_end, &walk);
1060
1061 if (!md->pages)
1062 goto out;
1063
1064 if (md->anon)
1065 seq_printf(m, " anon=%lu", md->anon);
1066
1067 if (md->dirty)
1068 seq_printf(m, " dirty=%lu", md->dirty);
1069
1070 if (md->pages != md->anon && md->pages != md->dirty)
1071 seq_printf(m, " mapped=%lu", md->pages);
1072
1073 if (md->mapcount_max > 1)
1074 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1075
1076 if (md->swapcache)
1077 seq_printf(m, " swapcache=%lu", md->swapcache);
1078
1079 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1080 seq_printf(m, " active=%lu", md->active);
1081
1082 if (md->writeback)
1083 seq_printf(m, " writeback=%lu", md->writeback);
1084
1085 for_each_node_state(n, N_HIGH_MEMORY)
1086 if (md->node[n])
1087 seq_printf(m, " N%d=%lu", n, md->node[n]);
1088out:
1089 seq_putc(m, '\n');
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001090
1091 if (m->count < m->size)
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001092 m->version = (vma != proc_priv->tail_vma) ? vma->vm_start : 0;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001093 return 0;
1094}
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001095
Jan Engelhardt03a44822008-02-08 04:21:19 -08001096static const struct seq_operations proc_pid_numa_maps_op = {
Christoph Lameter1a75a6c2006-01-08 01:01:02 -08001097 .start = m_start,
1098 .next = m_next,
1099 .stop = m_stop,
Alexey Dobriyan3bbfe052008-10-10 03:27:16 +04001100 .show = show_numa_map,
Christoph Lameter6e21c8f2005-09-03 15:54:45 -07001101};
Eric W. Biederman662795d2006-06-26 00:25:48 -07001102
1103static int numa_maps_open(struct inode *inode, struct file *file)
1104{
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001105 struct numa_maps_private *priv;
1106 int ret = -ENOMEM;
1107 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1108 if (priv) {
1109 priv->proc_maps.pid = proc_pid(inode);
1110 ret = seq_open(file, &proc_pid_numa_maps_op);
1111 if (!ret) {
1112 struct seq_file *m = file->private_data;
1113 m->private = priv;
1114 } else {
1115 kfree(priv);
1116 }
1117 }
1118 return ret;
Eric W. Biederman662795d2006-06-26 00:25:48 -07001119}
1120
Arjan van de Ven00977a52007-02-12 00:55:34 -08001121const struct file_operations proc_numa_maps_operations = {
Eric W. Biederman662795d2006-06-26 00:25:48 -07001122 .open = numa_maps_open,
1123 .read = seq_read,
1124 .llseek = seq_lseek,
Eric W. Biederman99f89552006-06-26 00:25:55 -07001125 .release = seq_release_private,
Eric W. Biederman662795d2006-06-26 00:25:48 -07001126};
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001127#endif /* CONFIG_NUMA */