blob: 9694cc2835115f18c5c6f9719d8ab9a332631901 [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
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700212static void
213show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
Mauricio Line070ad42005-09-03 15:55:10 -0700215 struct mm_struct *mm = vma->vm_mm;
216 struct file *file = vma->vm_file;
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700217 struct proc_maps_private *priv = m->private;
218 struct task_struct *task = priv->task;
KOSAKI Motohiroca16d142011-05-26 19:16:19 +0900219 vm_flags_t flags = vma->vm_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 unsigned long ino = 0;
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700221 unsigned long long pgoff = 0;
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200222 unsigned long start, end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 dev_t dev = 0;
224 int len;
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700225 const char *name = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 if (file) {
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800228 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 dev = inode->i_sb->s_dev;
230 ino = inode->i_ino;
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700231 pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
233
Linus Torvaldsd7824372010-08-15 11:35:52 -0700234 /* We don't show the stack guard page in /proc/maps */
235 start = vma->vm_start;
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200236 if (stack_guard_page_start(vma, start))
237 start += PAGE_SIZE;
238 end = vma->vm_end;
239 if (stack_guard_page_end(vma, end))
240 end -= PAGE_SIZE;
Linus Torvaldsd7824372010-08-15 11:35:52 -0700241
Clement Calmels1804dc62008-08-20 14:09:00 -0700242 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
Linus Torvaldsd7824372010-08-15 11:35:52 -0700243 start,
Mikulas Patockaa09a79f2011-05-09 13:01:09 +0200244 end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 flags & VM_READ ? 'r' : '-',
246 flags & VM_WRITE ? 'w' : '-',
247 flags & VM_EXEC ? 'x' : '-',
248 flags & VM_MAYSHARE ? 's' : 'p',
KAMEZAWA Hiroyuki6260a4b2009-04-06 19:00:30 -0700249 pgoff,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 MAJOR(dev), MINOR(dev), ino, &len);
251
252 /*
253 * Print the dentry name for named mappings, and a
254 * special [heap] marker for the heap:
255 */
Mauricio Line070ad42005-09-03 15:55:10 -0700256 if (file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 pad_len_spaces(m, len);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800258 seq_path(m, &file->f_path, "\n");
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700259 goto done;
260 }
261
262 name = arch_vma_name(vma);
263 if (!name) {
264 pid_t tid;
265
266 if (!mm) {
267 name = "[vdso]";
268 goto done;
269 }
270
271 if (vma->vm_start <= mm->brk &&
272 vma->vm_end >= mm->start_brk) {
273 name = "[heap]";
274 goto done;
275 }
276
277 tid = vm_is_stack(task, vma, is_pid);
278
279 if (tid != 0) {
280 /*
281 * Thread stack in /proc/PID/task/TID/maps or
282 * the main process stack.
283 */
284 if (!is_pid || (vma->vm_start <= mm->start_stack &&
285 vma->vm_end >= mm->start_stack)) {
286 name = "[stack]";
Ingo Molnare6e54942006-06-27 02:53:50 -0700287 } else {
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700288 /* Thread stack in /proc/PID/maps */
289 pad_len_spaces(m, len);
290 seq_printf(m, "[stack:%d]", tid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
Ingo Molnare6e54942006-06-27 02:53:50 -0700292 }
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700293 }
294
295done:
296 if (name) {
297 pad_len_spaces(m, len);
298 seq_puts(m, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 }
300 seq_putc(m, '\n');
Joe Korty7c88db02008-10-16 15:27:09 +0400301}
302
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700303static int show_map(struct seq_file *m, void *v, int is_pid)
Joe Korty7c88db02008-10-16 15:27:09 +0400304{
305 struct vm_area_struct *vma = v;
306 struct proc_maps_private *priv = m->private;
307 struct task_struct *task = priv->task;
308
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700309 show_map_vma(m, vma, is_pid);
Mauricio Line070ad42005-09-03 15:55:10 -0700310
Mauricio Line070ad42005-09-03 15:55:10 -0700311 if (m->count < m->size) /* vma is copied successfully */
Stephen Wilson31db58b2011-03-13 15:49:15 -0400312 m->version = (vma != get_gate_vma(task->mm))
313 ? vma->vm_start : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 return 0;
315}
316
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700317static int show_pid_map(struct seq_file *m, void *v)
318{
319 return show_map(m, v, 1);
320}
321
322static int show_tid_map(struct seq_file *m, void *v)
323{
324 return show_map(m, v, 0);
325}
326
Jan Engelhardt03a44822008-02-08 04:21:19 -0800327static const struct seq_operations proc_pid_maps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800328 .start = m_start,
329 .next = m_next,
330 .stop = m_stop,
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700331 .show = show_pid_map
Matt Mackalla6198792008-02-04 22:29:03 -0800332};
333
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700334static const struct seq_operations proc_tid_maps_op = {
335 .start = m_start,
336 .next = m_next,
337 .stop = m_stop,
338 .show = show_tid_map
339};
340
341static int pid_maps_open(struct inode *inode, struct file *file)
Matt Mackalla6198792008-02-04 22:29:03 -0800342{
343 return do_maps_open(inode, file, &proc_pid_maps_op);
344}
345
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700346static int tid_maps_open(struct inode *inode, struct file *file)
347{
348 return do_maps_open(inode, file, &proc_tid_maps_op);
349}
350
351const struct file_operations proc_pid_maps_operations = {
352 .open = pid_maps_open,
353 .read = seq_read,
354 .llseek = seq_lseek,
355 .release = seq_release_private,
356};
357
358const struct file_operations proc_tid_maps_operations = {
359 .open = tid_maps_open,
Matt Mackalla6198792008-02-04 22:29:03 -0800360 .read = seq_read,
361 .llseek = seq_lseek,
362 .release = seq_release_private,
363};
364
365/*
366 * Proportional Set Size(PSS): my share of RSS.
367 *
368 * PSS of a process is the count of pages it has in memory, where each
369 * page is divided by the number of processes sharing it. So if a
370 * process has 1000 pages all to itself, and 1000 shared with one other
371 * process, its PSS will be 1500.
372 *
373 * To keep (accumulated) division errors low, we adopt a 64bit
374 * fixed-point pss counter to minimize division errors. So (pss >>
375 * PSS_SHIFT) would be the real byte count.
376 *
377 * A shift of 12 before division means (assuming 4K page size):
378 * - 1M 3-user-pages add up to 8KB errors;
379 * - supports mapcount up to 2^24, or 16M;
380 * - supports PSS up to 2^52 bytes, or 4PB.
381 */
382#define PSS_SHIFT 12
383
Matt Mackall1e883282008-02-04 22:29:07 -0800384#ifdef CONFIG_PROC_PAGE_MONITOR
Peter Zijlstra214e4712008-04-28 02:12:55 -0700385struct mem_size_stats {
Matt Mackalla6198792008-02-04 22:29:03 -0800386 struct vm_area_struct *vma;
387 unsigned long resident;
388 unsigned long shared_clean;
389 unsigned long shared_dirty;
390 unsigned long private_clean;
391 unsigned long private_dirty;
392 unsigned long referenced;
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700393 unsigned long anonymous;
Dave Hansen4031a212011-03-22 16:33:01 -0700394 unsigned long anonymous_thp;
Peter Zijlstra214e4712008-04-28 02:12:55 -0700395 unsigned long swap;
Matt Mackalla6198792008-02-04 22:29:03 -0800396 u64 pss;
397};
398
Dave Hansenae11c4d2011-03-22 16:32:58 -0700399
400static void smaps_pte_entry(pte_t ptent, unsigned long addr,
Dave Hansen3c9acc72011-03-22 16:32:59 -0700401 unsigned long ptent_size, struct mm_walk *walk)
Dave Hansenae11c4d2011-03-22 16:32:58 -0700402{
403 struct mem_size_stats *mss = walk->private;
404 struct vm_area_struct *vma = mss->vma;
405 struct page *page;
406 int mapcount;
407
408 if (is_swap_pte(ptent)) {
Dave Hansen3c9acc72011-03-22 16:32:59 -0700409 mss->swap += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700410 return;
411 }
412
413 if (!pte_present(ptent))
414 return;
415
416 page = vm_normal_page(vma, addr, ptent);
417 if (!page)
418 return;
419
420 if (PageAnon(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700421 mss->anonymous += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700422
Dave Hansen3c9acc72011-03-22 16:32:59 -0700423 mss->resident += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700424 /* Accumulate the size in pages that have been accessed. */
425 if (pte_young(ptent) || PageReferenced(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700426 mss->referenced += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700427 mapcount = page_mapcount(page);
428 if (mapcount >= 2) {
429 if (pte_dirty(ptent) || PageDirty(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700430 mss->shared_dirty += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700431 else
Dave Hansen3c9acc72011-03-22 16:32:59 -0700432 mss->shared_clean += ptent_size;
433 mss->pss += (ptent_size << PSS_SHIFT) / mapcount;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700434 } else {
435 if (pte_dirty(ptent) || PageDirty(page))
Dave Hansen3c9acc72011-03-22 16:32:59 -0700436 mss->private_dirty += ptent_size;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700437 else
Dave Hansen3c9acc72011-03-22 16:32:59 -0700438 mss->private_clean += ptent_size;
439 mss->pss += (ptent_size << PSS_SHIFT);
Dave Hansenae11c4d2011-03-22 16:32:58 -0700440 }
441}
442
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800443static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700444 struct mm_walk *walk)
Mauricio Line070ad42005-09-03 15:55:10 -0700445{
Dave Hansen21650092008-06-12 15:21:47 -0700446 struct mem_size_stats *mss = walk->private;
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800447 struct vm_area_struct *vma = mss->vma;
Dave Hansenae11c4d2011-03-22 16:32:58 -0700448 pte_t *pte;
Hugh Dickins705e87c2005-10-29 18:16:27 -0700449 spinlock_t *ptl;
Mauricio Line070ad42005-09-03 15:55:10 -0700450
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700451 if (pmd_trans_huge_lock(pmd, vma) == 1) {
452 smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk);
Dave Hansen22e057c2011-03-22 16:33:00 -0700453 spin_unlock(&walk->mm->page_table_lock);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700454 mss->anonymous_thp += HPAGE_PMD_SIZE;
455 return 0;
Dave Hansen22e057c2011-03-22 16:33:00 -0700456 }
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700457
458 if (pmd_trans_unstable(pmd))
459 return 0;
Dave Hansen22e057c2011-03-22 16:33:00 -0700460 /*
461 * The mmap_sem held all the way back in m_start() is what
462 * keeps khugepaged out of here and from collapsing things
463 * in here.
464 */
Hugh Dickins705e87c2005-10-29 18:16:27 -0700465 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
Dave Hansenae11c4d2011-03-22 16:32:58 -0700466 for (; addr != end; pte++, addr += PAGE_SIZE)
Dave Hansen3c9acc72011-03-22 16:32:59 -0700467 smaps_pte_entry(*pte, addr, PAGE_SIZE, walk);
Hugh Dickins705e87c2005-10-29 18:16:27 -0700468 pte_unmap_unlock(pte - 1, ptl);
469 cond_resched();
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800470 return 0;
Mauricio Line070ad42005-09-03 15:55:10 -0700471}
472
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700473static int show_smap(struct seq_file *m, void *v, int is_pid)
Mauricio Line070ad42005-09-03 15:55:10 -0700474{
Joe Korty7c88db02008-10-16 15:27:09 +0400475 struct proc_maps_private *priv = m->private;
476 struct task_struct *task = priv->task;
Mauricio Line070ad42005-09-03 15:55:10 -0700477 struct vm_area_struct *vma = v;
Mauricio Line070ad42005-09-03 15:55:10 -0700478 struct mem_size_stats mss;
Dave Hansen21650092008-06-12 15:21:47 -0700479 struct mm_walk smaps_walk = {
480 .pmd_entry = smaps_pte_range,
481 .mm = vma->vm_mm,
482 .private = &mss,
483 };
Mauricio Line070ad42005-09-03 15:55:10 -0700484
485 memset(&mss, 0, sizeof mss);
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800486 mss.vma = vma;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900487 /* mmap_sem is held in m_start */
Nick Piggin5ddfae12006-03-06 15:42:57 -0800488 if (vma->vm_mm && !is_vm_hugetlb_page(vma))
Dave Hansen21650092008-06-12 15:21:47 -0700489 walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
Matt Mackall4752c362008-02-04 22:29:02 -0800490
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700491 show_map_vma(m, vma, is_pid);
Matt Mackall4752c362008-02-04 22:29:02 -0800492
493 seq_printf(m,
494 "Size: %8lu kB\n"
495 "Rss: %8lu kB\n"
496 "Pss: %8lu kB\n"
497 "Shared_Clean: %8lu kB\n"
498 "Shared_Dirty: %8lu kB\n"
499 "Private_Clean: %8lu kB\n"
500 "Private_Dirty: %8lu kB\n"
Peter Zijlstra214e4712008-04-28 02:12:55 -0700501 "Referenced: %8lu kB\n"
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700502 "Anonymous: %8lu kB\n"
Dave Hansen4031a212011-03-22 16:33:01 -0700503 "AnonHugePages: %8lu kB\n"
Mel Gorman08fba692009-01-06 14:38:53 -0800504 "Swap: %8lu kB\n"
Mel Gorman33402892009-01-06 14:38:54 -0800505 "KernelPageSize: %8lu kB\n"
Nikanth Karthikesan2d905082011-01-13 15:45:53 -0800506 "MMUPageSize: %8lu kB\n"
507 "Locked: %8lu kB\n",
Matt Mackall4752c362008-02-04 22:29:02 -0800508 (vma->vm_end - vma->vm_start) >> 10,
509 mss.resident >> 10,
510 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
511 mss.shared_clean >> 10,
512 mss.shared_dirty >> 10,
513 mss.private_clean >> 10,
514 mss.private_dirty >> 10,
Peter Zijlstra214e4712008-04-28 02:12:55 -0700515 mss.referenced >> 10,
Nikanth Karthikesanb40d4f82010-10-27 15:34:10 -0700516 mss.anonymous >> 10,
Dave Hansen4031a212011-03-22 16:33:01 -0700517 mss.anonymous_thp >> 10,
Mel Gorman08fba692009-01-06 14:38:53 -0800518 mss.swap >> 10,
Mel Gorman33402892009-01-06 14:38:54 -0800519 vma_kernel_pagesize(vma) >> 10,
Nikanth Karthikesan2d905082011-01-13 15:45:53 -0800520 vma_mmu_pagesize(vma) >> 10,
521 (vma->vm_flags & VM_LOCKED) ?
522 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
Matt Mackall4752c362008-02-04 22:29:02 -0800523
Joe Korty7c88db02008-10-16 15:27:09 +0400524 if (m->count < m->size) /* vma is copied successfully */
Stephen Wilson31db58b2011-03-13 15:49:15 -0400525 m->version = (vma != get_gate_vma(task->mm))
526 ? vma->vm_start : 0;
Joe Korty7c88db02008-10-16 15:27:09 +0400527 return 0;
Mauricio Line070ad42005-09-03 15:55:10 -0700528}
529
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700530static int show_pid_smap(struct seq_file *m, void *v)
531{
532 return show_smap(m, v, 1);
533}
534
535static int show_tid_smap(struct seq_file *m, void *v)
536{
537 return show_smap(m, v, 0);
538}
539
Jan Engelhardt03a44822008-02-08 04:21:19 -0800540static const struct seq_operations proc_pid_smaps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800541 .start = m_start,
542 .next = m_next,
543 .stop = m_stop,
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700544 .show = show_pid_smap
Matt Mackalla6198792008-02-04 22:29:03 -0800545};
546
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700547static const struct seq_operations proc_tid_smaps_op = {
548 .start = m_start,
549 .next = m_next,
550 .stop = m_stop,
551 .show = show_tid_smap
552};
553
554static int pid_smaps_open(struct inode *inode, struct file *file)
Matt Mackalla6198792008-02-04 22:29:03 -0800555{
556 return do_maps_open(inode, file, &proc_pid_smaps_op);
557}
558
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -0700559static int tid_smaps_open(struct inode *inode, struct file *file)
560{
561 return do_maps_open(inode, file, &proc_tid_smaps_op);
562}
563
564const struct file_operations proc_pid_smaps_operations = {
565 .open = pid_smaps_open,
566 .read = seq_read,
567 .llseek = seq_lseek,
568 .release = seq_release_private,
569};
570
571const struct file_operations proc_tid_smaps_operations = {
572 .open = tid_smaps_open,
Matt Mackalla6198792008-02-04 22:29:03 -0800573 .read = seq_read,
574 .llseek = seq_lseek,
575 .release = seq_release_private,
576};
577
578static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
Dave Hansen21650092008-06-12 15:21:47 -0700579 unsigned long end, struct mm_walk *walk)
Matt Mackalla6198792008-02-04 22:29:03 -0800580{
Dave Hansen21650092008-06-12 15:21:47 -0700581 struct vm_area_struct *vma = walk->private;
Matt Mackalla6198792008-02-04 22:29:03 -0800582 pte_t *pte, ptent;
583 spinlock_t *ptl;
584 struct page *page;
585
Dave Hansen03319322011-03-22 16:32:56 -0700586 split_huge_page_pmd(walk->mm, pmd);
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700587 if (pmd_trans_unstable(pmd))
588 return 0;
Dave Hansen03319322011-03-22 16:32:56 -0700589
Matt Mackalla6198792008-02-04 22:29:03 -0800590 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
591 for (; addr != end; pte++, addr += PAGE_SIZE) {
592 ptent = *pte;
593 if (!pte_present(ptent))
594 continue;
595
596 page = vm_normal_page(vma, addr, ptent);
597 if (!page)
598 continue;
599
Will Deacon85e72aa2012-01-20 14:34:09 -0800600 if (PageReserved(page))
601 continue;
602
Matt Mackalla6198792008-02-04 22:29:03 -0800603 /* Clear accessed and referenced bits. */
604 ptep_test_and_clear_young(vma, addr, pte);
605 ClearPageReferenced(page);
606 }
607 pte_unmap_unlock(pte - 1, ptl);
608 cond_resched();
609 return 0;
610}
611
Moussa A. Ba398499d2009-09-21 17:02:29 -0700612#define CLEAR_REFS_ALL 1
613#define CLEAR_REFS_ANON 2
614#define CLEAR_REFS_MAPPED 3
615
Matt Mackallf248dcb2008-02-04 22:29:03 -0800616static ssize_t clear_refs_write(struct file *file, const char __user *buf,
617 size_t count, loff_t *ppos)
David Rientjesb813e932007-05-06 14:49:24 -0700618{
Matt Mackallf248dcb2008-02-04 22:29:03 -0800619 struct task_struct *task;
Vincent Lifb92a4b2009-09-22 16:45:36 -0700620 char buffer[PROC_NUMBUF];
Matt Mackallf248dcb2008-02-04 22:29:03 -0800621 struct mm_struct *mm;
David Rientjesb813e932007-05-06 14:49:24 -0700622 struct vm_area_struct *vma;
Alexey Dobriyan0a8cb8e2011-05-26 16:25:50 -0700623 int type;
624 int rv;
David Rientjesb813e932007-05-06 14:49:24 -0700625
Matt Mackallf248dcb2008-02-04 22:29:03 -0800626 memset(buffer, 0, sizeof(buffer));
627 if (count > sizeof(buffer) - 1)
628 count = sizeof(buffer) - 1;
629 if (copy_from_user(buffer, buf, count))
630 return -EFAULT;
Alexey Dobriyan0a8cb8e2011-05-26 16:25:50 -0700631 rv = kstrtoint(strstrip(buffer), 10, &type);
632 if (rv < 0)
633 return rv;
Moussa A. Ba398499d2009-09-21 17:02:29 -0700634 if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED)
Matt Mackallf248dcb2008-02-04 22:29:03 -0800635 return -EINVAL;
Matt Mackallf248dcb2008-02-04 22:29:03 -0800636 task = get_proc_task(file->f_path.dentry->d_inode);
637 if (!task)
638 return -ESRCH;
639 mm = get_task_mm(task);
640 if (mm) {
Andrew Morton20cbc972008-07-05 12:29:05 -0700641 struct mm_walk clear_refs_walk = {
642 .pmd_entry = clear_refs_pte_range,
643 .mm = mm,
644 };
Matt Mackallf248dcb2008-02-04 22:29:03 -0800645 down_read(&mm->mmap_sem);
Dave Hansen21650092008-06-12 15:21:47 -0700646 for (vma = mm->mmap; vma; vma = vma->vm_next) {
647 clear_refs_walk.private = vma;
Moussa A. Ba398499d2009-09-21 17:02:29 -0700648 if (is_vm_hugetlb_page(vma))
649 continue;
650 /*
651 * Writing 1 to /proc/pid/clear_refs affects all pages.
652 *
653 * Writing 2 to /proc/pid/clear_refs only affects
654 * Anonymous pages.
655 *
656 * Writing 3 to /proc/pid/clear_refs only affects file
657 * mapped pages.
658 */
659 if (type == CLEAR_REFS_ANON && vma->vm_file)
660 continue;
661 if (type == CLEAR_REFS_MAPPED && !vma->vm_file)
662 continue;
663 walk_page_range(vma->vm_start, vma->vm_end,
664 &clear_refs_walk);
Dave Hansen21650092008-06-12 15:21:47 -0700665 }
Matt Mackallf248dcb2008-02-04 22:29:03 -0800666 flush_tlb_mm(mm);
667 up_read(&mm->mmap_sem);
668 mmput(mm);
669 }
670 put_task_struct(task);
Vincent Lifb92a4b2009-09-22 16:45:36 -0700671
672 return count;
David Rientjesb813e932007-05-06 14:49:24 -0700673}
674
Matt Mackallf248dcb2008-02-04 22:29:03 -0800675const struct file_operations proc_clear_refs_operations = {
676 .write = clear_refs_write,
Arnd Bergmann6038f372010-08-15 18:52:59 +0200677 .llseek = noop_llseek,
Matt Mackallf248dcb2008-02-04 22:29:03 -0800678};
679
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700680typedef struct {
681 u64 pme;
682} pagemap_entry_t;
683
Matt Mackall85863e42008-02-04 22:29:04 -0800684struct pagemapread {
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900685 int pos, len;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700686 pagemap_entry_t *buffer;
Matt Mackall85863e42008-02-04 22:29:04 -0800687};
688
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700689#define PAGEMAP_WALK_SIZE (PMD_SIZE)
690#define PAGEMAP_WALK_MASK (PMD_MASK)
691
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500692#define PM_ENTRY_BYTES sizeof(u64)
693#define PM_STATUS_BITS 3
694#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
695#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
696#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
697#define PM_PSHIFT_BITS 6
698#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
699#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
700#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
701#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
702#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
703
704#define PM_PRESENT PM_STATUS(4LL)
705#define PM_SWAP PM_STATUS(2LL)
706#define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT)
Matt Mackall85863e42008-02-04 22:29:04 -0800707#define PM_END_OF_BUFFER 1
708
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700709static inline pagemap_entry_t make_pme(u64 val)
710{
711 return (pagemap_entry_t) { .pme = val };
712}
713
714static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme,
Matt Mackall85863e42008-02-04 22:29:04 -0800715 struct pagemapread *pm)
716{
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700717 pm->buffer[pm->pos++] = *pme;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900718 if (pm->pos >= pm->len)
Thomas Tuttleaae86792008-06-05 22:46:31 -0700719 return PM_END_OF_BUFFER;
Matt Mackall85863e42008-02-04 22:29:04 -0800720 return 0;
721}
722
723static int pagemap_pte_hole(unsigned long start, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700724 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800725{
Dave Hansen21650092008-06-12 15:21:47 -0700726 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800727 unsigned long addr;
728 int err = 0;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700729 pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
730
Matt Mackall85863e42008-02-04 22:29:04 -0800731 for (addr = start; addr < end; addr += PAGE_SIZE) {
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700732 err = add_to_pagemap(addr, &pme, pm);
Matt Mackall85863e42008-02-04 22:29:04 -0800733 if (err)
734 break;
735 }
736 return err;
737}
738
Adrian Bunk9d02dbc2008-04-28 02:12:11 -0700739static u64 swap_pte_to_pagemap_entry(pte_t pte)
Matt Mackall85863e42008-02-04 22:29:04 -0800740{
741 swp_entry_t e = pte_to_swp_entry(pte);
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500742 return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT);
Matt Mackall85863e42008-02-04 22:29:04 -0800743}
744
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700745static void pte_to_pagemap_entry(pagemap_entry_t *pme, pte_t pte)
Dave Hansenbcf80392008-06-12 15:21:48 -0700746{
Dave Hansenbcf80392008-06-12 15:21:48 -0700747 if (is_swap_pte(pte))
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700748 *pme = make_pme(PM_PFRAME(swap_pte_to_pagemap_entry(pte))
749 | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP);
Dave Hansenbcf80392008-06-12 15:21:48 -0700750 else if (pte_present(pte))
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700751 *pme = make_pme(PM_PFRAME(pte_pfn(pte))
752 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
Dave Hansenbcf80392008-06-12 15:21:48 -0700753}
754
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700755#ifdef CONFIG_TRANSPARENT_HUGEPAGE
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700756static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
757 pmd_t pmd, int offset)
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700758{
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700759 /*
760 * Currently pmd for thp is always present because thp can not be
761 * swapped-out, migrated, or HWPOISONed (split in such cases instead.)
762 * This if-check is just to prepare for future implementation.
763 */
764 if (pmd_present(pmd))
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700765 *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset)
766 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700767}
768#else
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700769static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme,
770 pmd_t pmd, int offset)
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700771{
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700772}
773#endif
774
Matt Mackall85863e42008-02-04 22:29:04 -0800775static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700776 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800777{
Dave Hansenbcf80392008-06-12 15:21:48 -0700778 struct vm_area_struct *vma;
Dave Hansen21650092008-06-12 15:21:47 -0700779 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800780 pte_t *pte;
781 int err = 0;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700782 pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
Matt Mackall85863e42008-02-04 22:29:04 -0800783
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -0700784 if (pmd_trans_unstable(pmd))
785 return 0;
Dave Hansen03319322011-03-22 16:32:56 -0700786
Dave Hansenbcf80392008-06-12 15:21:48 -0700787 /* find the first VMA at or above 'addr' */
788 vma = find_vma(walk->mm, addr);
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700789 spin_lock(&walk->mm->page_table_lock);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700790 if (pmd_trans_huge_lock(pmd, vma) == 1) {
791 for (; addr != end; addr += PAGE_SIZE) {
792 unsigned long offset;
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700793
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700794 offset = (addr & ~PAGEMAP_WALK_MASK) >>
795 PAGE_SHIFT;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700796 thp_pmd_to_pagemap_entry(&pme, *pmd, offset);
797 err = add_to_pagemap(addr, &pme, pm);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700798 if (err)
799 break;
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700800 }
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700801 spin_unlock(&walk->mm->page_table_lock);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -0700802 return err;
Naoya Horiguchi5aaabe82012-03-21 16:33:57 -0700803 }
804
Matt Mackall85863e42008-02-04 22:29:04 -0800805 for (; addr != end; addr += PAGE_SIZE) {
Dave Hansenbcf80392008-06-12 15:21:48 -0700806
807 /* check to see if we've left 'vma' behind
808 * and need a new, higher one */
809 if (vma && (addr >= vma->vm_end))
810 vma = find_vma(walk->mm, addr);
811
812 /* check that 'vma' actually covers this address,
813 * and that it isn't a huge page vma */
814 if (vma && (vma->vm_start <= addr) &&
815 !is_vm_hugetlb_page(vma)) {
816 pte = pte_offset_map(pmd, addr);
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700817 pte_to_pagemap_entry(&pme, *pte);
Dave Hansenbcf80392008-06-12 15:21:48 -0700818 /* unmap before userspace copy */
819 pte_unmap(pte);
820 }
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700821 err = add_to_pagemap(addr, &pme, pm);
Matt Mackall85863e42008-02-04 22:29:04 -0800822 if (err)
823 return err;
824 }
825
826 cond_resched();
827
828 return err;
829}
830
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700831#ifdef CONFIG_HUGETLB_PAGE
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700832static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme,
833 pte_t pte, int offset)
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800834{
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800835 if (pte_present(pte))
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700836 *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset)
837 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT);
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800838}
839
Naoya Horiguchi116354d2010-04-06 14:35:04 -0700840/* This function walks within one hugetlb entry in the single call */
841static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
842 unsigned long addr, unsigned long end,
843 struct mm_walk *walk)
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800844{
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800845 struct pagemapread *pm = walk->private;
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800846 int err = 0;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700847 pagemap_entry_t pme = make_pme(PM_NOT_PRESENT);
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800848
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800849 for (; addr != end; addr += PAGE_SIZE) {
Naoya Horiguchi116354d2010-04-06 14:35:04 -0700850 int offset = (addr & ~hmask) >> PAGE_SHIFT;
Naoya Horiguchi092b50b2012-03-21 16:33:59 -0700851 huge_pte_to_pagemap_entry(&pme, *pte, offset);
852 err = add_to_pagemap(addr, &pme, pm);
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800853 if (err)
854 return err;
855 }
856
857 cond_resched();
858
859 return err;
860}
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700861#endif /* HUGETLB_PAGE */
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800862
Matt Mackall85863e42008-02-04 22:29:04 -0800863/*
864 * /proc/pid/pagemap - an array mapping virtual pages to pfns
865 *
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500866 * For each page in the address space, this file contains one 64-bit entry
867 * consisting of the following:
868 *
869 * Bits 0-55 page frame number (PFN) if present
870 * Bits 0-4 swap type if swapped
871 * Bits 5-55 swap offset if swapped
872 * Bits 55-60 page shift (page size = 1<<page shift)
873 * Bit 61 reserved for future use
874 * Bit 62 page swapped
875 * Bit 63 page present
876 *
877 * If the page is not present but in swap, then the PFN contains an
878 * encoding of the swap file number and the page's offset into the
879 * swap. Unmapped pages return a null PFN. This allows determining
Matt Mackall85863e42008-02-04 22:29:04 -0800880 * precisely which pages are mapped (or in swap) and comparing mapped
881 * pages between processes.
882 *
883 * Efficient users of this interface will use /proc/pid/maps to
884 * determine which areas of memory are actually mapped and llseek to
885 * skip over unmapped regions.
886 */
887static ssize_t pagemap_read(struct file *file, char __user *buf,
888 size_t count, loff_t *ppos)
889{
890 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Matt Mackall85863e42008-02-04 22:29:04 -0800891 struct mm_struct *mm;
892 struct pagemapread pm;
Matt Mackall85863e42008-02-04 22:29:04 -0800893 int ret = -ESRCH;
Alexey Dobriyanee1e6ab2008-07-21 14:21:36 -0700894 struct mm_walk pagemap_walk = {};
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700895 unsigned long src;
896 unsigned long svpfn;
897 unsigned long start_vaddr;
898 unsigned long end_vaddr;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900899 int copied = 0;
Matt Mackall85863e42008-02-04 22:29:04 -0800900
901 if (!task)
902 goto out;
903
Matt Mackall85863e42008-02-04 22:29:04 -0800904 ret = -EINVAL;
905 /* file position must be aligned */
Thomas Tuttleaae86792008-06-05 22:46:31 -0700906 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
Marcelo Tosattifb393802008-03-13 12:32:35 -0700907 goto out_task;
Matt Mackall85863e42008-02-04 22:29:04 -0800908
909 ret = 0;
Vitaly Mayatskikh08161782009-04-30 15:08:18 -0700910 if (!count)
911 goto out_task;
912
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900913 pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT);
914 pm.buffer = kmalloc(pm.len, GFP_TEMPORARY);
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700915 ret = -ENOMEM;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900916 if (!pm.buffer)
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700917 goto out_task;
918
919 mm = mm_for_maps(task);
920 ret = PTR_ERR(mm);
921 if (!mm || IS_ERR(mm))
922 goto out_free;
Matt Mackall85863e42008-02-04 22:29:04 -0800923
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700924 pagemap_walk.pmd_entry = pagemap_pte_range;
925 pagemap_walk.pte_hole = pagemap_pte_hole;
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700926#ifdef CONFIG_HUGETLB_PAGE
Naoya Horiguchi5dc37642009-12-14 18:00:01 -0800927 pagemap_walk.hugetlb_entry = pagemap_hugetlb_range;
Naoya Horiguchi1a5cb812010-05-24 14:32:12 -0700928#endif
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700929 pagemap_walk.mm = mm;
930 pagemap_walk.private = &pm;
Matt Mackall85863e42008-02-04 22:29:04 -0800931
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700932 src = *ppos;
933 svpfn = src / PM_ENTRY_BYTES;
934 start_vaddr = svpfn << PAGE_SHIFT;
935 end_vaddr = TASK_SIZE_OF(task);
Matt Mackall85863e42008-02-04 22:29:04 -0800936
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700937 /* watch out for wraparound */
938 if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
939 start_vaddr = end_vaddr;
940
941 /*
942 * The odds are that this will stop walking way
943 * before end_vaddr, because the length of the
944 * user buffer is tracked in "pm", and the walk
945 * will stop when we hit the end of the buffer.
946 */
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900947 ret = 0;
948 while (count && (start_vaddr < end_vaddr)) {
949 int len;
950 unsigned long end;
Matt Mackall85863e42008-02-04 22:29:04 -0800951
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900952 pm.pos = 0;
Naoya Horiguchiea251c12010-11-24 12:57:13 -0800953 end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900954 /* overflow ? */
955 if (end < start_vaddr || end > end_vaddr)
956 end = end_vaddr;
957 down_read(&mm->mmap_sem);
958 ret = walk_page_range(start_vaddr, end, &pagemap_walk);
959 up_read(&mm->mmap_sem);
960 start_vaddr = end;
961
962 len = min(count, PM_ENTRY_BYTES * pm.pos);
Dan Carpenter309361e02010-04-06 13:45:39 +0300963 if (copy_to_user(buf, pm.buffer, len)) {
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900964 ret = -EFAULT;
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700965 goto out_mm;
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900966 }
967 copied += len;
968 buf += len;
969 count -= len;
Matt Mackall85863e42008-02-04 22:29:04 -0800970 }
KAMEZAWA Hiroyukid82ef022010-04-02 09:11:29 +0900971 *ppos += copied;
972 if (!ret || ret == PM_END_OF_BUFFER)
973 ret = copied;
974
Marcelo Tosattifb393802008-03-13 12:32:35 -0700975out_mm:
976 mmput(mm);
KOSAKI Motohiro98bc93e2011-05-26 16:25:53 -0700977out_free:
978 kfree(pm.buffer);
Matt Mackall85863e42008-02-04 22:29:04 -0800979out_task:
980 put_task_struct(task);
981out:
982 return ret;
983}
984
985const struct file_operations proc_pagemap_operations = {
986 .llseek = mem_lseek, /* borrow this */
987 .read = pagemap_read,
988};
Matt Mackall1e883282008-02-04 22:29:07 -0800989#endif /* CONFIG_PROC_PAGE_MONITOR */
Matt Mackall85863e42008-02-04 22:29:04 -0800990
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700991#ifdef CONFIG_NUMA
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700992
Stephen Wilsonf69ff942011-05-24 17:12:47 -0700993struct numa_maps {
994 struct vm_area_struct *vma;
995 unsigned long pages;
996 unsigned long anon;
997 unsigned long active;
998 unsigned long writeback;
999 unsigned long mapcount_max;
1000 unsigned long dirty;
1001 unsigned long swapcache;
1002 unsigned long node[MAX_NUMNODES];
1003};
1004
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001005struct numa_maps_private {
1006 struct proc_maps_private proc_maps;
1007 struct numa_maps md;
1008};
1009
Dave Hanseneb4866d2011-09-20 15:19:38 -07001010static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
1011 unsigned long nr_pages)
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001012{
1013 int count = page_mapcount(page);
1014
Dave Hanseneb4866d2011-09-20 15:19:38 -07001015 md->pages += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001016 if (pte_dirty || PageDirty(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -07001017 md->dirty += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001018
1019 if (PageSwapCache(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -07001020 md->swapcache += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001021
1022 if (PageActive(page) || PageUnevictable(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -07001023 md->active += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001024
1025 if (PageWriteback(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -07001026 md->writeback += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001027
1028 if (PageAnon(page))
Dave Hanseneb4866d2011-09-20 15:19:38 -07001029 md->anon += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001030
1031 if (count > md->mapcount_max)
1032 md->mapcount_max = count;
1033
Dave Hanseneb4866d2011-09-20 15:19:38 -07001034 md->node[page_to_nid(page)] += nr_pages;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001035}
1036
Dave Hansen3200a8a2011-09-20 15:19:39 -07001037static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma,
1038 unsigned long addr)
1039{
1040 struct page *page;
1041 int nid;
1042
1043 if (!pte_present(pte))
1044 return NULL;
1045
1046 page = vm_normal_page(vma, addr, pte);
1047 if (!page)
1048 return NULL;
1049
1050 if (PageReserved(page))
1051 return NULL;
1052
1053 nid = page_to_nid(page);
1054 if (!node_isset(nid, node_states[N_HIGH_MEMORY]))
1055 return NULL;
1056
1057 return page;
1058}
1059
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001060static int gather_pte_stats(pmd_t *pmd, unsigned long addr,
1061 unsigned long end, struct mm_walk *walk)
1062{
1063 struct numa_maps *md;
1064 spinlock_t *ptl;
1065 pte_t *orig_pte;
1066 pte_t *pte;
1067
1068 md = walk->private;
Dave Hansen32ef4382011-09-20 15:19:41 -07001069
Naoya Horiguchi025c5b22012-03-21 16:33:57 -07001070 if (pmd_trans_huge_lock(pmd, md->vma) == 1) {
1071 pte_t huge_pte = *(pte_t *)pmd;
1072 struct page *page;
1073
1074 page = can_gather_numa_stats(huge_pte, md->vma, addr);
1075 if (page)
1076 gather_stats(page, md, pte_dirty(huge_pte),
1077 HPAGE_PMD_SIZE/PAGE_SIZE);
Dave Hansen32ef4382011-09-20 15:19:41 -07001078 spin_unlock(&walk->mm->page_table_lock);
Naoya Horiguchi025c5b22012-03-21 16:33:57 -07001079 return 0;
Dave Hansen32ef4382011-09-20 15:19:41 -07001080 }
1081
Andrea Arcangeli1a5a9902012-03-21 16:33:42 -07001082 if (pmd_trans_unstable(pmd))
1083 return 0;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001084 orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl);
1085 do {
Dave Hansen3200a8a2011-09-20 15:19:39 -07001086 struct page *page = can_gather_numa_stats(*pte, md->vma, addr);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001087 if (!page)
1088 continue;
Dave Hanseneb4866d2011-09-20 15:19:38 -07001089 gather_stats(page, md, pte_dirty(*pte), 1);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001090
1091 } while (pte++, addr += PAGE_SIZE, addr != end);
1092 pte_unmap_unlock(orig_pte, ptl);
1093 return 0;
1094}
1095#ifdef CONFIG_HUGETLB_PAGE
1096static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
1097 unsigned long addr, unsigned long end, struct mm_walk *walk)
1098{
1099 struct numa_maps *md;
1100 struct page *page;
1101
1102 if (pte_none(*pte))
1103 return 0;
1104
1105 page = pte_page(*pte);
1106 if (!page)
1107 return 0;
1108
1109 md = walk->private;
Dave Hanseneb4866d2011-09-20 15:19:38 -07001110 gather_stats(page, md, pte_dirty(*pte), 1);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001111 return 0;
1112}
1113
1114#else
1115static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask,
1116 unsigned long addr, unsigned long end, struct mm_walk *walk)
1117{
1118 return 0;
1119}
1120#endif
1121
1122/*
1123 * Display pages allocated per node and memory policy via /proc.
1124 */
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001125static int show_numa_map(struct seq_file *m, void *v, int is_pid)
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001126{
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001127 struct numa_maps_private *numa_priv = m->private;
1128 struct proc_maps_private *proc_priv = &numa_priv->proc_maps;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001129 struct vm_area_struct *vma = v;
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001130 struct numa_maps *md = &numa_priv->md;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001131 struct file *file = vma->vm_file;
1132 struct mm_struct *mm = vma->vm_mm;
1133 struct mm_walk walk = {};
1134 struct mempolicy *pol;
1135 int n;
1136 char buffer[50];
1137
1138 if (!mm)
1139 return 0;
1140
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001141 /* Ensure we start with an empty set of numa_maps statistics. */
1142 memset(md, 0, sizeof(*md));
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001143
1144 md->vma = vma;
1145
1146 walk.hugetlb_entry = gather_hugetbl_stats;
1147 walk.pmd_entry = gather_pte_stats;
1148 walk.private = md;
1149 walk.mm = mm;
1150
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001151 pol = get_vma_policy(proc_priv->task, vma, vma->vm_start);
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001152 mpol_to_str(buffer, sizeof(buffer), pol, 0);
1153 mpol_cond_put(pol);
1154
1155 seq_printf(m, "%08lx %s", vma->vm_start, buffer);
1156
1157 if (file) {
1158 seq_printf(m, " file=");
1159 seq_path(m, &file->f_path, "\n\t= ");
1160 } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) {
1161 seq_printf(m, " heap");
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001162 } else {
1163 pid_t tid = vm_is_stack(proc_priv->task, vma, is_pid);
1164 if (tid != 0) {
1165 /*
1166 * Thread stack in /proc/PID/task/TID/maps or
1167 * the main process stack.
1168 */
1169 if (!is_pid || (vma->vm_start <= mm->start_stack &&
1170 vma->vm_end >= mm->start_stack))
1171 seq_printf(m, " stack");
1172 else
1173 seq_printf(m, " stack:%d", tid);
1174 }
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001175 }
1176
Andrew Mortonfc360bd2011-10-31 17:06:32 -07001177 if (is_vm_hugetlb_page(vma))
1178 seq_printf(m, " huge");
1179
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001180 walk_page_range(vma->vm_start, vma->vm_end, &walk);
1181
1182 if (!md->pages)
1183 goto out;
1184
1185 if (md->anon)
1186 seq_printf(m, " anon=%lu", md->anon);
1187
1188 if (md->dirty)
1189 seq_printf(m, " dirty=%lu", md->dirty);
1190
1191 if (md->pages != md->anon && md->pages != md->dirty)
1192 seq_printf(m, " mapped=%lu", md->pages);
1193
1194 if (md->mapcount_max > 1)
1195 seq_printf(m, " mapmax=%lu", md->mapcount_max);
1196
1197 if (md->swapcache)
1198 seq_printf(m, " swapcache=%lu", md->swapcache);
1199
1200 if (md->active < md->pages && !is_vm_hugetlb_page(vma))
1201 seq_printf(m, " active=%lu", md->active);
1202
1203 if (md->writeback)
1204 seq_printf(m, " writeback=%lu", md->writeback);
1205
1206 for_each_node_state(n, N_HIGH_MEMORY)
1207 if (md->node[n])
1208 seq_printf(m, " N%d=%lu", n, md->node[n]);
1209out:
1210 seq_putc(m, '\n');
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001211
1212 if (m->count < m->size)
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001213 m->version = (vma != proc_priv->tail_vma) ? vma->vm_start : 0;
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001214 return 0;
1215}
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001216
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001217static int show_pid_numa_map(struct seq_file *m, void *v)
1218{
1219 return show_numa_map(m, v, 1);
1220}
1221
1222static int show_tid_numa_map(struct seq_file *m, void *v)
1223{
1224 return show_numa_map(m, v, 0);
1225}
1226
Jan Engelhardt03a44822008-02-08 04:21:19 -08001227static const struct seq_operations proc_pid_numa_maps_op = {
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001228 .start = m_start,
1229 .next = m_next,
1230 .stop = m_stop,
1231 .show = show_pid_numa_map,
Christoph Lameter6e21c8f2005-09-03 15:54:45 -07001232};
Eric W. Biederman662795d2006-06-26 00:25:48 -07001233
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001234static const struct seq_operations proc_tid_numa_maps_op = {
1235 .start = m_start,
1236 .next = m_next,
1237 .stop = m_stop,
1238 .show = show_tid_numa_map,
1239};
1240
1241static int numa_maps_open(struct inode *inode, struct file *file,
1242 const struct seq_operations *ops)
Eric W. Biederman662795d2006-06-26 00:25:48 -07001243{
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001244 struct numa_maps_private *priv;
1245 int ret = -ENOMEM;
1246 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1247 if (priv) {
1248 priv->proc_maps.pid = proc_pid(inode);
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001249 ret = seq_open(file, ops);
Stephen Wilson5b52fc82011-05-24 17:12:49 -07001250 if (!ret) {
1251 struct seq_file *m = file->private_data;
1252 m->private = priv;
1253 } else {
1254 kfree(priv);
1255 }
1256 }
1257 return ret;
Eric W. Biederman662795d2006-06-26 00:25:48 -07001258}
1259
Siddhesh Poyarekarb7643752012-03-21 16:34:04 -07001260static int pid_numa_maps_open(struct inode *inode, struct file *file)
1261{
1262 return numa_maps_open(inode, file, &proc_pid_numa_maps_op);
1263}
1264
1265static int tid_numa_maps_open(struct inode *inode, struct file *file)
1266{
1267 return numa_maps_open(inode, file, &proc_tid_numa_maps_op);
1268}
1269
1270const struct file_operations proc_pid_numa_maps_operations = {
1271 .open = pid_numa_maps_open,
1272 .read = seq_read,
1273 .llseek = seq_lseek,
1274 .release = seq_release_private,
1275};
1276
1277const struct file_operations proc_tid_numa_maps_operations = {
1278 .open = tid_numa_maps_open,
Eric W. Biederman662795d2006-06-26 00:25:48 -07001279 .read = seq_read,
1280 .llseek = seq_lseek,
Eric W. Biederman99f89552006-06-26 00:25:55 -07001281 .release = seq_release_private,
Eric W. Biederman662795d2006-06-26 00:25:48 -07001282};
Stephen Wilsonf69ff942011-05-24 17:12:47 -07001283#endif /* CONFIG_NUMA */