blob: 4806830ea2a1b0515c2faf00f52a6134f0f418c1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#include <linux/mm.h>
2#include <linux/hugetlb.h>
3#include <linux/mount.h>
4#include <linux/seq_file.h>
Mauricio Line070ad42005-09-03 15:55:10 -07005#include <linux/highmem.h>
Kees Cook5096add2007-05-08 00:26:04 -07006#include <linux/ptrace.h>
Christoph Lameter6e21c8f2005-09-03 15:54:45 -07007#include <linux/pagemap.h>
8#include <linux/mempolicy.h>
Matt Mackall85863e42008-02-04 22:29:04 -08009#include <linux/swap.h>
10#include <linux/swapops.h>
Mauricio Line070ad42005-09-03 15:55:10 -070011
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <asm/elf.h>
13#include <asm/uaccess.h>
Mauricio Line070ad42005-09-03 15:55:10 -070014#include <asm/tlbflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include "internal.h"
16
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080017void task_mem(struct seq_file *m, struct mm_struct *mm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070018{
19 unsigned long data, text, lib;
Hugh Dickins365e9c872005-10-29 18:16:18 -070020 unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
21
22 /*
23 * Note: to minimize their overhead, mm maintains hiwater_vm and
24 * hiwater_rss only when about to *lower* total_vm or rss. Any
25 * collector of these hiwater stats must therefore get total_vm
26 * and rss too, which will usually be the higher. Barriers? not
27 * worth the effort, such snapshots can always be inconsistent.
28 */
29 hiwater_vm = total_vm = mm->total_vm;
30 if (hiwater_vm < mm->hiwater_vm)
31 hiwater_vm = mm->hiwater_vm;
32 hiwater_rss = total_rss = get_mm_rss(mm);
33 if (hiwater_rss < mm->hiwater_rss)
34 hiwater_rss = mm->hiwater_rss;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36 data = mm->total_vm - mm->shared_vm - mm->stack_vm;
37 text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
38 lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
Eric W. Biedermandf5f8312008-02-08 04:18:33 -080039 seq_printf(m,
Hugh Dickins365e9c872005-10-29 18:16:18 -070040 "VmPeak:\t%8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 "VmSize:\t%8lu kB\n"
42 "VmLck:\t%8lu kB\n"
Hugh Dickins365e9c872005-10-29 18:16:18 -070043 "VmHWM:\t%8lu kB\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 "VmRSS:\t%8lu kB\n"
45 "VmData:\t%8lu kB\n"
46 "VmStk:\t%8lu kB\n"
47 "VmExe:\t%8lu kB\n"
48 "VmLib:\t%8lu kB\n"
49 "VmPTE:\t%8lu kB\n",
Hugh Dickins365e9c872005-10-29 18:16:18 -070050 hiwater_vm << (PAGE_SHIFT-10),
51 (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 mm->locked_vm << (PAGE_SHIFT-10),
Hugh Dickins365e9c872005-10-29 18:16:18 -070053 hiwater_rss << (PAGE_SHIFT-10),
54 total_rss << (PAGE_SHIFT-10),
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 data << (PAGE_SHIFT-10),
56 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
57 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058}
59
60unsigned long task_vsize(struct mm_struct *mm)
61{
62 return PAGE_SIZE * mm->total_vm;
63}
64
65int task_statm(struct mm_struct *mm, int *shared, int *text,
66 int *data, int *resident)
67{
Hugh Dickins42946212005-10-29 18:16:05 -070068 *shared = get_mm_counter(mm, file_rss);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
70 >> PAGE_SHIFT;
71 *data = mm->total_vm - mm->shared_vm;
Hugh Dickins42946212005-10-29 18:16:05 -070072 *resident = *shared + get_mm_counter(mm, anon_rss);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return mm->total_vm;
74}
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076static void pad_len_spaces(struct seq_file *m, int len)
77{
78 len = 25 + sizeof(void*) * 6 - len;
79 if (len < 1)
80 len = 1;
81 seq_printf(m, "%*c", len, ' ');
82}
83
Matt Mackalla6198792008-02-04 22:29:03 -080084static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma)
Mauricio Line070ad42005-09-03 15:55:10 -070085{
Matt Mackalla6198792008-02-04 22:29:03 -080086 if (vma && vma != priv->tail_vma) {
87 struct mm_struct *mm = vma->vm_mm;
88 up_read(&mm->mmap_sem);
89 mmput(mm);
90 }
91}
92
93static void *m_start(struct seq_file *m, loff_t *pos)
94{
95 struct proc_maps_private *priv = m->private;
96 unsigned long last_addr = m->version;
97 struct mm_struct *mm;
98 struct vm_area_struct *vma, *tail_vma = NULL;
99 loff_t l = *pos;
100
101 /* Clear the per syscall fields in priv */
102 priv->task = NULL;
103 priv->tail_vma = NULL;
104
105 /*
106 * We remember last_addr rather than next_addr to hit with
107 * mmap_cache most of the time. We have zero last_addr at
108 * the beginning and also after lseek. We will have -1 last_addr
109 * after the end of the vmas.
110 */
111
112 if (last_addr == -1UL)
113 return NULL;
114
115 priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
116 if (!priv->task)
117 return NULL;
118
119 mm = mm_for_maps(priv->task);
120 if (!mm)
121 return NULL;
122
123 tail_vma = get_gate_vma(priv->task);
124 priv->tail_vma = tail_vma;
125
126 /* Start with last addr hint */
127 vma = find_vma(mm, last_addr);
128 if (last_addr && vma) {
129 vma = vma->vm_next;
130 goto out;
131 }
132
133 /*
134 * Check the vma index is within the range and do
135 * sequential scan until m_index.
136 */
137 vma = NULL;
138 if ((unsigned long)l < mm->map_count) {
139 vma = mm->mmap;
140 while (l-- && vma)
141 vma = vma->vm_next;
142 goto out;
143 }
144
145 if (l != mm->map_count)
146 tail_vma = NULL; /* After gate vma */
147
148out:
149 if (vma)
150 return vma;
151
152 /* End of vmas has been reached */
153 m->version = (tail_vma != NULL)? 0: -1UL;
154 up_read(&mm->mmap_sem);
155 mmput(mm);
156 return tail_vma;
157}
158
159static void *m_next(struct seq_file *m, void *v, loff_t *pos)
160{
161 struct proc_maps_private *priv = m->private;
162 struct vm_area_struct *vma = v;
163 struct vm_area_struct *tail_vma = priv->tail_vma;
164
165 (*pos)++;
166 if (vma && (vma != tail_vma) && vma->vm_next)
167 return vma->vm_next;
168 vma_stop(priv, vma);
169 return (vma != tail_vma)? tail_vma: NULL;
170}
171
172static void m_stop(struct seq_file *m, void *v)
173{
174 struct proc_maps_private *priv = m->private;
175 struct vm_area_struct *vma = v;
176
177 vma_stop(priv, vma);
178 if (priv->task)
179 put_task_struct(priv->task);
180}
181
182static int do_maps_open(struct inode *inode, struct file *file,
Jan Engelhardt03a44822008-02-08 04:21:19 -0800183 const struct seq_operations *ops)
Matt Mackalla6198792008-02-04 22:29:03 -0800184{
185 struct proc_maps_private *priv;
186 int ret = -ENOMEM;
187 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
188 if (priv) {
189 priv->pid = proc_pid(inode);
190 ret = seq_open(file, ops);
191 if (!ret) {
192 struct seq_file *m = file->private_data;
193 m->private = priv;
194 } else {
195 kfree(priv);
196 }
197 }
198 return ret;
199}
Mauricio Line070ad42005-09-03 15:55:10 -0700200
Matt Mackall4752c362008-02-04 22:29:02 -0800201static int show_map(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700203 struct proc_maps_private *priv = m->private;
204 struct task_struct *task = priv->task;
Mauricio Line070ad42005-09-03 15:55:10 -0700205 struct vm_area_struct *vma = v;
206 struct mm_struct *mm = vma->vm_mm;
207 struct file *file = vma->vm_file;
208 int flags = vma->vm_flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 unsigned long ino = 0;
210 dev_t dev = 0;
211 int len;
212
213 if (file) {
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800214 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 dev = inode->i_sb->s_dev;
216 ino = inode->i_ino;
217 }
218
Clement Calmels1804dc62008-08-20 14:09:00 -0700219 seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
Mauricio Line070ad42005-09-03 15:55:10 -0700220 vma->vm_start,
221 vma->vm_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 flags & VM_READ ? 'r' : '-',
223 flags & VM_WRITE ? 'w' : '-',
224 flags & VM_EXEC ? 'x' : '-',
225 flags & VM_MAYSHARE ? 's' : 'p',
Clement Calmels1804dc62008-08-20 14:09:00 -0700226 ((loff_t)vma->vm_pgoff) << PAGE_SHIFT,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 MAJOR(dev), MINOR(dev), ino, &len);
228
229 /*
230 * Print the dentry name for named mappings, and a
231 * special [heap] marker for the heap:
232 */
Mauricio Line070ad42005-09-03 15:55:10 -0700233 if (file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 pad_len_spaces(m, len);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800235 seq_path(m, &file->f_path, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 } else {
Ingo Molnare6e54942006-06-27 02:53:50 -0700237 const char *name = arch_vma_name(vma);
238 if (!name) {
239 if (mm) {
240 if (vma->vm_start <= mm->start_brk &&
Mauricio Line070ad42005-09-03 15:55:10 -0700241 vma->vm_end >= mm->brk) {
Ingo Molnare6e54942006-06-27 02:53:50 -0700242 name = "[heap]";
243 } else if (vma->vm_start <= mm->start_stack &&
244 vma->vm_end >= mm->start_stack) {
245 name = "[stack]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 }
Ingo Molnare6e54942006-06-27 02:53:50 -0700247 } else {
248 name = "[vdso]";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 }
Ingo Molnare6e54942006-06-27 02:53:50 -0700250 }
251 if (name) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 pad_len_spaces(m, len);
Ingo Molnare6e54942006-06-27 02:53:50 -0700253 seq_puts(m, name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 }
255 }
256 seq_putc(m, '\n');
Mauricio Line070ad42005-09-03 15:55:10 -0700257
Mauricio Line070ad42005-09-03 15:55:10 -0700258 if (m->count < m->size) /* vma is copied successfully */
259 m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return 0;
261}
262
Jan Engelhardt03a44822008-02-08 04:21:19 -0800263static const struct seq_operations proc_pid_maps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800264 .start = m_start,
265 .next = m_next,
266 .stop = m_stop,
267 .show = show_map
268};
269
270static int maps_open(struct inode *inode, struct file *file)
271{
272 return do_maps_open(inode, file, &proc_pid_maps_op);
273}
274
275const struct file_operations proc_maps_operations = {
276 .open = maps_open,
277 .read = seq_read,
278 .llseek = seq_lseek,
279 .release = seq_release_private,
280};
281
282/*
283 * Proportional Set Size(PSS): my share of RSS.
284 *
285 * PSS of a process is the count of pages it has in memory, where each
286 * page is divided by the number of processes sharing it. So if a
287 * process has 1000 pages all to itself, and 1000 shared with one other
288 * process, its PSS will be 1500.
289 *
290 * To keep (accumulated) division errors low, we adopt a 64bit
291 * fixed-point pss counter to minimize division errors. So (pss >>
292 * PSS_SHIFT) would be the real byte count.
293 *
294 * A shift of 12 before division means (assuming 4K page size):
295 * - 1M 3-user-pages add up to 8KB errors;
296 * - supports mapcount up to 2^24, or 16M;
297 * - supports PSS up to 2^52 bytes, or 4PB.
298 */
299#define PSS_SHIFT 12
300
Matt Mackall1e883282008-02-04 22:29:07 -0800301#ifdef CONFIG_PROC_PAGE_MONITOR
Peter Zijlstra214e4712008-04-28 02:12:55 -0700302struct mem_size_stats {
Matt Mackalla6198792008-02-04 22:29:03 -0800303 struct vm_area_struct *vma;
304 unsigned long resident;
305 unsigned long shared_clean;
306 unsigned long shared_dirty;
307 unsigned long private_clean;
308 unsigned long private_dirty;
309 unsigned long referenced;
Peter Zijlstra214e4712008-04-28 02:12:55 -0700310 unsigned long swap;
Matt Mackalla6198792008-02-04 22:29:03 -0800311 u64 pss;
312};
313
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800314static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700315 struct mm_walk *walk)
Mauricio Line070ad42005-09-03 15:55:10 -0700316{
Dave Hansen21650092008-06-12 15:21:47 -0700317 struct mem_size_stats *mss = walk->private;
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800318 struct vm_area_struct *vma = mss->vma;
Mauricio Line070ad42005-09-03 15:55:10 -0700319 pte_t *pte, ptent;
Hugh Dickins705e87c2005-10-29 18:16:27 -0700320 spinlock_t *ptl;
Mauricio Line070ad42005-09-03 15:55:10 -0700321 struct page *page;
Fengguang Wuec4dd3e2008-02-04 22:28:56 -0800322 int mapcount;
Mauricio Line070ad42005-09-03 15:55:10 -0700323
Hugh Dickins705e87c2005-10-29 18:16:27 -0700324 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
David Rientjes826fad12007-05-06 14:49:21 -0700325 for (; addr != end; pte++, addr += PAGE_SIZE) {
Mauricio Line070ad42005-09-03 15:55:10 -0700326 ptent = *pte;
Peter Zijlstra214e4712008-04-28 02:12:55 -0700327
328 if (is_swap_pte(ptent)) {
329 mss->swap += PAGE_SIZE;
330 continue;
331 }
332
Hugh Dickins705e87c2005-10-29 18:16:27 -0700333 if (!pte_present(ptent))
Mauricio Line070ad42005-09-03 15:55:10 -0700334 continue;
335
336 mss->resident += PAGE_SIZE;
Nick Pigginad820c5d2006-03-06 15:42:58 -0800337
338 page = vm_normal_page(vma, addr, ptent);
339 if (!page)
Mauricio Line070ad42005-09-03 15:55:10 -0700340 continue;
341
David Rientjesf79f1772007-05-06 14:49:22 -0700342 /* Accumulate the size in pages that have been accessed. */
343 if (pte_young(ptent) || PageReferenced(page))
344 mss->referenced += PAGE_SIZE;
Fengguang Wuec4dd3e2008-02-04 22:28:56 -0800345 mapcount = page_mapcount(page);
346 if (mapcount >= 2) {
Mauricio Line070ad42005-09-03 15:55:10 -0700347 if (pte_dirty(ptent))
348 mss->shared_dirty += PAGE_SIZE;
349 else
350 mss->shared_clean += PAGE_SIZE;
Fengguang Wuec4dd3e2008-02-04 22:28:56 -0800351 mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
Mauricio Line070ad42005-09-03 15:55:10 -0700352 } else {
353 if (pte_dirty(ptent))
354 mss->private_dirty += PAGE_SIZE;
355 else
356 mss->private_clean += PAGE_SIZE;
Fengguang Wuec4dd3e2008-02-04 22:28:56 -0800357 mss->pss += (PAGE_SIZE << PSS_SHIFT);
Mauricio Line070ad42005-09-03 15:55:10 -0700358 }
David Rientjes826fad12007-05-06 14:49:21 -0700359 }
Hugh Dickins705e87c2005-10-29 18:16:27 -0700360 pte_unmap_unlock(pte - 1, ptl);
361 cond_resched();
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800362 return 0;
Mauricio Line070ad42005-09-03 15:55:10 -0700363}
364
Mauricio Line070ad42005-09-03 15:55:10 -0700365static int show_smap(struct seq_file *m, void *v)
366{
367 struct vm_area_struct *vma = v;
Mauricio Line070ad42005-09-03 15:55:10 -0700368 struct mem_size_stats mss;
Matt Mackall4752c362008-02-04 22:29:02 -0800369 int ret;
Dave Hansen21650092008-06-12 15:21:47 -0700370 struct mm_walk smaps_walk = {
371 .pmd_entry = smaps_pte_range,
372 .mm = vma->vm_mm,
373 .private = &mss,
374 };
Mauricio Line070ad42005-09-03 15:55:10 -0700375
376 memset(&mss, 0, sizeof mss);
Matt Mackallb3ae5ac2008-02-04 22:29:01 -0800377 mss.vma = vma;
Nick Piggin5ddfae12006-03-06 15:42:57 -0800378 if (vma->vm_mm && !is_vm_hugetlb_page(vma))
Dave Hansen21650092008-06-12 15:21:47 -0700379 walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
Matt Mackall4752c362008-02-04 22:29:02 -0800380
381 ret = show_map(m, v);
382 if (ret)
383 return ret;
384
385 seq_printf(m,
386 "Size: %8lu kB\n"
387 "Rss: %8lu kB\n"
388 "Pss: %8lu kB\n"
389 "Shared_Clean: %8lu kB\n"
390 "Shared_Dirty: %8lu kB\n"
391 "Private_Clean: %8lu kB\n"
392 "Private_Dirty: %8lu kB\n"
Peter Zijlstra214e4712008-04-28 02:12:55 -0700393 "Referenced: %8lu kB\n"
394 "Swap: %8lu kB\n",
Matt Mackall4752c362008-02-04 22:29:02 -0800395 (vma->vm_end - vma->vm_start) >> 10,
396 mss.resident >> 10,
397 (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
398 mss.shared_clean >> 10,
399 mss.shared_dirty >> 10,
400 mss.private_clean >> 10,
401 mss.private_dirty >> 10,
Peter Zijlstra214e4712008-04-28 02:12:55 -0700402 mss.referenced >> 10,
403 mss.swap >> 10);
Matt Mackall4752c362008-02-04 22:29:02 -0800404
405 return ret;
Mauricio Line070ad42005-09-03 15:55:10 -0700406}
407
Jan Engelhardt03a44822008-02-08 04:21:19 -0800408static const struct seq_operations proc_pid_smaps_op = {
Matt Mackalla6198792008-02-04 22:29:03 -0800409 .start = m_start,
410 .next = m_next,
411 .stop = m_stop,
412 .show = show_smap
413};
414
415static int smaps_open(struct inode *inode, struct file *file)
416{
417 return do_maps_open(inode, file, &proc_pid_smaps_op);
418}
419
420const struct file_operations proc_smaps_operations = {
421 .open = smaps_open,
422 .read = seq_read,
423 .llseek = seq_lseek,
424 .release = seq_release_private,
425};
426
427static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
Dave Hansen21650092008-06-12 15:21:47 -0700428 unsigned long end, struct mm_walk *walk)
Matt Mackalla6198792008-02-04 22:29:03 -0800429{
Dave Hansen21650092008-06-12 15:21:47 -0700430 struct vm_area_struct *vma = walk->private;
Matt Mackalla6198792008-02-04 22:29:03 -0800431 pte_t *pte, ptent;
432 spinlock_t *ptl;
433 struct page *page;
434
435 pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
436 for (; addr != end; pte++, addr += PAGE_SIZE) {
437 ptent = *pte;
438 if (!pte_present(ptent))
439 continue;
440
441 page = vm_normal_page(vma, addr, ptent);
442 if (!page)
443 continue;
444
445 /* Clear accessed and referenced bits. */
446 ptep_test_and_clear_young(vma, addr, pte);
447 ClearPageReferenced(page);
448 }
449 pte_unmap_unlock(pte - 1, ptl);
450 cond_resched();
451 return 0;
452}
453
Matt Mackallf248dcb2008-02-04 22:29:03 -0800454static ssize_t clear_refs_write(struct file *file, const char __user *buf,
455 size_t count, loff_t *ppos)
David Rientjesb813e932007-05-06 14:49:24 -0700456{
Matt Mackallf248dcb2008-02-04 22:29:03 -0800457 struct task_struct *task;
458 char buffer[PROC_NUMBUF], *end;
459 struct mm_struct *mm;
David Rientjesb813e932007-05-06 14:49:24 -0700460 struct vm_area_struct *vma;
461
Matt Mackallf248dcb2008-02-04 22:29:03 -0800462 memset(buffer, 0, sizeof(buffer));
463 if (count > sizeof(buffer) - 1)
464 count = sizeof(buffer) - 1;
465 if (copy_from_user(buffer, buf, count))
466 return -EFAULT;
467 if (!simple_strtol(buffer, &end, 0))
468 return -EINVAL;
469 if (*end == '\n')
470 end++;
471 task = get_proc_task(file->f_path.dentry->d_inode);
472 if (!task)
473 return -ESRCH;
474 mm = get_task_mm(task);
475 if (mm) {
Andrew Morton20cbc972008-07-05 12:29:05 -0700476 struct mm_walk clear_refs_walk = {
477 .pmd_entry = clear_refs_pte_range,
478 .mm = mm,
479 };
Matt Mackallf248dcb2008-02-04 22:29:03 -0800480 down_read(&mm->mmap_sem);
Dave Hansen21650092008-06-12 15:21:47 -0700481 for (vma = mm->mmap; vma; vma = vma->vm_next) {
482 clear_refs_walk.private = vma;
Matt Mackallf248dcb2008-02-04 22:29:03 -0800483 if (!is_vm_hugetlb_page(vma))
Dave Hansen21650092008-06-12 15:21:47 -0700484 walk_page_range(vma->vm_start, vma->vm_end,
485 &clear_refs_walk);
486 }
Matt Mackallf248dcb2008-02-04 22:29:03 -0800487 flush_tlb_mm(mm);
488 up_read(&mm->mmap_sem);
489 mmput(mm);
490 }
491 put_task_struct(task);
492 if (end - buffer == 0)
493 return -EIO;
494 return end - buffer;
David Rientjesb813e932007-05-06 14:49:24 -0700495}
496
Matt Mackallf248dcb2008-02-04 22:29:03 -0800497const struct file_operations proc_clear_refs_operations = {
498 .write = clear_refs_write,
499};
500
Matt Mackall85863e42008-02-04 22:29:04 -0800501struct pagemapread {
Thomas Tuttleaae86792008-06-05 22:46:31 -0700502 u64 __user *out, *end;
Matt Mackall85863e42008-02-04 22:29:04 -0800503};
504
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500505#define PM_ENTRY_BYTES sizeof(u64)
506#define PM_STATUS_BITS 3
507#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
508#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
509#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
510#define PM_PSHIFT_BITS 6
511#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
512#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
513#define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
514#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
515#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
516
517#define PM_PRESENT PM_STATUS(4LL)
518#define PM_SWAP PM_STATUS(2LL)
519#define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT)
Matt Mackall85863e42008-02-04 22:29:04 -0800520#define PM_END_OF_BUFFER 1
521
522static int add_to_pagemap(unsigned long addr, u64 pfn,
523 struct pagemapread *pm)
524{
Matt Mackall85863e42008-02-04 22:29:04 -0800525 if (put_user(pfn, pm->out))
526 return -EFAULT;
Thomas Tuttleaae86792008-06-05 22:46:31 -0700527 pm->out++;
528 if (pm->out >= pm->end)
529 return PM_END_OF_BUFFER;
Matt Mackall85863e42008-02-04 22:29:04 -0800530 return 0;
531}
532
533static int pagemap_pte_hole(unsigned long start, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700534 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800535{
Dave Hansen21650092008-06-12 15:21:47 -0700536 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800537 unsigned long addr;
538 int err = 0;
539 for (addr = start; addr < end; addr += PAGE_SIZE) {
540 err = add_to_pagemap(addr, PM_NOT_PRESENT, pm);
541 if (err)
542 break;
543 }
544 return err;
545}
546
Adrian Bunk9d02dbc2008-04-28 02:12:11 -0700547static u64 swap_pte_to_pagemap_entry(pte_t pte)
Matt Mackall85863e42008-02-04 22:29:04 -0800548{
549 swp_entry_t e = pte_to_swp_entry(pte);
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500550 return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT);
Matt Mackall85863e42008-02-04 22:29:04 -0800551}
552
Dave Hansenbcf80392008-06-12 15:21:48 -0700553static unsigned long pte_to_pagemap_entry(pte_t pte)
554{
555 unsigned long pme = 0;
556 if (is_swap_pte(pte))
557 pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte))
558 | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP;
559 else if (pte_present(pte))
560 pme = PM_PFRAME(pte_pfn(pte))
561 | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
562 return pme;
563}
564
Matt Mackall85863e42008-02-04 22:29:04 -0800565static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
Dave Hansen21650092008-06-12 15:21:47 -0700566 struct mm_walk *walk)
Matt Mackall85863e42008-02-04 22:29:04 -0800567{
Dave Hansenbcf80392008-06-12 15:21:48 -0700568 struct vm_area_struct *vma;
Dave Hansen21650092008-06-12 15:21:47 -0700569 struct pagemapread *pm = walk->private;
Matt Mackall85863e42008-02-04 22:29:04 -0800570 pte_t *pte;
571 int err = 0;
572
Dave Hansenbcf80392008-06-12 15:21:48 -0700573 /* find the first VMA at or above 'addr' */
574 vma = find_vma(walk->mm, addr);
Matt Mackall85863e42008-02-04 22:29:04 -0800575 for (; addr != end; addr += PAGE_SIZE) {
576 u64 pfn = PM_NOT_PRESENT;
Dave Hansenbcf80392008-06-12 15:21:48 -0700577
578 /* check to see if we've left 'vma' behind
579 * and need a new, higher one */
580 if (vma && (addr >= vma->vm_end))
581 vma = find_vma(walk->mm, addr);
582
583 /* check that 'vma' actually covers this address,
584 * and that it isn't a huge page vma */
585 if (vma && (vma->vm_start <= addr) &&
586 !is_vm_hugetlb_page(vma)) {
587 pte = pte_offset_map(pmd, addr);
588 pfn = pte_to_pagemap_entry(*pte);
589 /* unmap before userspace copy */
590 pte_unmap(pte);
591 }
Matt Mackall85863e42008-02-04 22:29:04 -0800592 err = add_to_pagemap(addr, pfn, pm);
593 if (err)
594 return err;
595 }
596
597 cond_resched();
598
599 return err;
600}
601
Matt Mackall85863e42008-02-04 22:29:04 -0800602/*
603 * /proc/pid/pagemap - an array mapping virtual pages to pfns
604 *
Hans Rosenfeldf16278c2008-03-21 18:46:59 -0500605 * For each page in the address space, this file contains one 64-bit entry
606 * consisting of the following:
607 *
608 * Bits 0-55 page frame number (PFN) if present
609 * Bits 0-4 swap type if swapped
610 * Bits 5-55 swap offset if swapped
611 * Bits 55-60 page shift (page size = 1<<page shift)
612 * Bit 61 reserved for future use
613 * Bit 62 page swapped
614 * Bit 63 page present
615 *
616 * If the page is not present but in swap, then the PFN contains an
617 * encoding of the swap file number and the page's offset into the
618 * swap. Unmapped pages return a null PFN. This allows determining
Matt Mackall85863e42008-02-04 22:29:04 -0800619 * precisely which pages are mapped (or in swap) and comparing mapped
620 * pages between processes.
621 *
622 * Efficient users of this interface will use /proc/pid/maps to
623 * determine which areas of memory are actually mapped and llseek to
624 * skip over unmapped regions.
625 */
626static ssize_t pagemap_read(struct file *file, char __user *buf,
627 size_t count, loff_t *ppos)
628{
629 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
630 struct page **pages, *page;
631 unsigned long uaddr, uend;
632 struct mm_struct *mm;
633 struct pagemapread pm;
634 int pagecount;
635 int ret = -ESRCH;
Alexey Dobriyanee1e6ab2008-07-21 14:21:36 -0700636 struct mm_walk pagemap_walk = {};
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700637 unsigned long src;
638 unsigned long svpfn;
639 unsigned long start_vaddr;
640 unsigned long end_vaddr;
Matt Mackall85863e42008-02-04 22:29:04 -0800641
642 if (!task)
643 goto out;
644
645 ret = -EACCES;
Stephen Smalley006ebb42008-05-19 08:32:49 -0400646 if (!ptrace_may_access(task, PTRACE_MODE_READ))
Marcelo Tosattifb393802008-03-13 12:32:35 -0700647 goto out_task;
Matt Mackall85863e42008-02-04 22:29:04 -0800648
649 ret = -EINVAL;
650 /* file position must be aligned */
Thomas Tuttleaae86792008-06-05 22:46:31 -0700651 if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES))
Marcelo Tosattifb393802008-03-13 12:32:35 -0700652 goto out_task;
Matt Mackall85863e42008-02-04 22:29:04 -0800653
654 ret = 0;
655 mm = get_task_mm(task);
656 if (!mm)
Marcelo Tosattifb393802008-03-13 12:32:35 -0700657 goto out_task;
Matt Mackall85863e42008-02-04 22:29:04 -0800658
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700659
Matt Mackall85863e42008-02-04 22:29:04 -0800660 uaddr = (unsigned long)buf & PAGE_MASK;
661 uend = (unsigned long)(buf + count);
662 pagecount = (PAGE_ALIGN(uend) - uaddr) / PAGE_SIZE;
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700663 ret = 0;
664 if (pagecount == 0)
665 goto out_mm;
666 pages = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
667 ret = -ENOMEM;
Matt Mackall85863e42008-02-04 22:29:04 -0800668 if (!pages)
Marcelo Tosattifb393802008-03-13 12:32:35 -0700669 goto out_mm;
Matt Mackall85863e42008-02-04 22:29:04 -0800670
671 down_read(&current->mm->mmap_sem);
672 ret = get_user_pages(current, current->mm, uaddr, pagecount,
673 1, 0, pages, NULL);
674 up_read(&current->mm->mmap_sem);
675
676 if (ret < 0)
677 goto out_free;
678
Marcelo Tosattifb393802008-03-13 12:32:35 -0700679 if (ret != pagecount) {
680 pagecount = ret;
681 ret = -EFAULT;
682 goto out_pages;
683 }
684
Thomas Tuttleaae86792008-06-05 22:46:31 -0700685 pm.out = (u64 *)buf;
686 pm.end = (u64 *)(buf + count);
Matt Mackall85863e42008-02-04 22:29:04 -0800687
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700688 pagemap_walk.pmd_entry = pagemap_pte_range;
689 pagemap_walk.pte_hole = pagemap_pte_hole;
690 pagemap_walk.mm = mm;
691 pagemap_walk.private = &pm;
Matt Mackall85863e42008-02-04 22:29:04 -0800692
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700693 src = *ppos;
694 svpfn = src / PM_ENTRY_BYTES;
695 start_vaddr = svpfn << PAGE_SHIFT;
696 end_vaddr = TASK_SIZE_OF(task);
Matt Mackall85863e42008-02-04 22:29:04 -0800697
Andrew Morton5d7e0d22008-07-05 01:02:01 -0700698 /* watch out for wraparound */
699 if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT)
700 start_vaddr = end_vaddr;
701
702 /*
703 * The odds are that this will stop walking way
704 * before end_vaddr, because the length of the
705 * user buffer is tracked in "pm", and the walk
706 * will stop when we hit the end of the buffer.
707 */
708 ret = walk_page_range(start_vaddr, end_vaddr, &pagemap_walk);
709 if (ret == PM_END_OF_BUFFER)
710 ret = 0;
711 /* don't need mmap_sem for these, but this looks cleaner */
712 *ppos += (char *)pm.out - buf;
713 if (!ret)
714 ret = (char *)pm.out - buf;
Matt Mackall85863e42008-02-04 22:29:04 -0800715
Marcelo Tosattifb393802008-03-13 12:32:35 -0700716out_pages:
Matt Mackall85863e42008-02-04 22:29:04 -0800717 for (; pagecount; pagecount--) {
718 page = pages[pagecount-1];
719 if (!PageReserved(page))
720 SetPageDirty(page);
721 page_cache_release(page);
722 }
Matt Mackall85863e42008-02-04 22:29:04 -0800723out_free:
724 kfree(pages);
Marcelo Tosattifb393802008-03-13 12:32:35 -0700725out_mm:
726 mmput(mm);
Matt Mackall85863e42008-02-04 22:29:04 -0800727out_task:
728 put_task_struct(task);
729out:
730 return ret;
731}
732
733const struct file_operations proc_pagemap_operations = {
734 .llseek = mem_lseek, /* borrow this */
735 .read = pagemap_read,
736};
Matt Mackall1e883282008-02-04 22:29:07 -0800737#endif /* CONFIG_PROC_PAGE_MONITOR */
Matt Mackall85863e42008-02-04 22:29:04 -0800738
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700739#ifdef CONFIG_NUMA
Christoph Lameter1a75a6c2006-01-08 01:01:02 -0800740extern int show_numa_map(struct seq_file *m, void *v);
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700741
Jan Engelhardt03a44822008-02-08 04:21:19 -0800742static const struct seq_operations proc_pid_numa_maps_op = {
Christoph Lameter1a75a6c2006-01-08 01:01:02 -0800743 .start = m_start,
744 .next = m_next,
745 .stop = m_stop,
Alexey Dobriyan3bbfe052008-10-10 03:27:16 +0400746 .show = show_numa_map,
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700747};
Eric W. Biederman662795d2006-06-26 00:25:48 -0700748
749static int numa_maps_open(struct inode *inode, struct file *file)
750{
751 return do_maps_open(inode, file, &proc_pid_numa_maps_op);
752}
753
Arjan van de Ven00977a52007-02-12 00:55:34 -0800754const struct file_operations proc_numa_maps_operations = {
Eric W. Biederman662795d2006-06-26 00:25:48 -0700755 .open = numa_maps_open,
756 .read = seq_read,
757 .llseek = seq_lseek,
Eric W. Biederman99f89552006-06-26 00:25:55 -0700758 .release = seq_release_private,
Eric W. Biederman662795d2006-06-26 00:25:48 -0700759};
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700760#endif