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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/mm.h> |
2 | #include <linux/hugetlb.h> | |
3 | #include <linux/mount.h> | |
4 | #include <linux/seq_file.h> | |
e070ad49 | 5 | #include <linux/highmem.h> |
5096add8 | 6 | #include <linux/ptrace.h> |
5a0e3ad6 | 7 | #include <linux/slab.h> |
6e21c8f1 CL |
8 | #include <linux/pagemap.h> |
9 | #include <linux/mempolicy.h> | |
85863e47 MM |
10 | #include <linux/swap.h> |
11 | #include <linux/swapops.h> | |
e070ad49 | 12 | |
1da177e4 LT |
13 | #include <asm/elf.h> |
14 | #include <asm/uaccess.h> | |
e070ad49 | 15 | #include <asm/tlbflush.h> |
1da177e4 LT |
16 | #include "internal.h" |
17 | ||
df5f8314 | 18 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 19 | { |
b084d435 | 20 | unsigned long data, text, lib, swap; |
365e9c87 HD |
21 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
22 | ||
23 | /* | |
24 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
25 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
26 | * collector of these hiwater stats must therefore get total_vm | |
27 | * and rss too, which will usually be the higher. Barriers? not | |
28 | * worth the effort, such snapshots can always be inconsistent. | |
29 | */ | |
30 | hiwater_vm = total_vm = mm->total_vm; | |
31 | if (hiwater_vm < mm->hiwater_vm) | |
32 | hiwater_vm = mm->hiwater_vm; | |
33 | hiwater_rss = total_rss = get_mm_rss(mm); | |
34 | if (hiwater_rss < mm->hiwater_rss) | |
35 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 LT |
36 | |
37 | data = mm->total_vm - mm->shared_vm - mm->stack_vm; | |
38 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; | |
39 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 40 | swap = get_mm_counter(mm, MM_SWAPENTS); |
df5f8314 | 41 | seq_printf(m, |
365e9c87 | 42 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
43 | "VmSize:\t%8lu kB\n" |
44 | "VmLck:\t%8lu kB\n" | |
365e9c87 | 45 | "VmHWM:\t%8lu kB\n" |
1da177e4 LT |
46 | "VmRSS:\t%8lu kB\n" |
47 | "VmData:\t%8lu kB\n" | |
48 | "VmStk:\t%8lu kB\n" | |
49 | "VmExe:\t%8lu kB\n" | |
50 | "VmLib:\t%8lu kB\n" | |
b084d435 KH |
51 | "VmPTE:\t%8lu kB\n" |
52 | "VmSwap:\t%8lu kB\n", | |
365e9c87 HD |
53 | hiwater_vm << (PAGE_SHIFT-10), |
54 | (total_vm - mm->reserved_vm) << (PAGE_SHIFT-10), | |
1da177e4 | 55 | mm->locked_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
56 | hiwater_rss << (PAGE_SHIFT-10), |
57 | total_rss << (PAGE_SHIFT-10), | |
1da177e4 LT |
58 | data << (PAGE_SHIFT-10), |
59 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, | |
b084d435 KH |
60 | (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10, |
61 | swap << (PAGE_SHIFT-10)); | |
1da177e4 LT |
62 | } |
63 | ||
64 | unsigned long task_vsize(struct mm_struct *mm) | |
65 | { | |
66 | return PAGE_SIZE * mm->total_vm; | |
67 | } | |
68 | ||
69 | int task_statm(struct mm_struct *mm, int *shared, int *text, | |
70 | int *data, int *resident) | |
71 | { | |
d559db08 | 72 | *shared = get_mm_counter(mm, MM_FILEPAGES); |
1da177e4 LT |
73 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
74 | >> PAGE_SHIFT; | |
75 | *data = mm->total_vm - mm->shared_vm; | |
d559db08 | 76 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
77 | return mm->total_vm; |
78 | } | |
79 | ||
1da177e4 LT |
80 | static void pad_len_spaces(struct seq_file *m, int len) |
81 | { | |
82 | len = 25 + sizeof(void*) * 6 - len; | |
83 | if (len < 1) | |
84 | len = 1; | |
85 | seq_printf(m, "%*c", len, ' '); | |
86 | } | |
87 | ||
a6198797 MM |
88 | static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma) |
89 | { | |
90 | if (vma && vma != priv->tail_vma) { | |
91 | struct mm_struct *mm = vma->vm_mm; | |
92 | up_read(&mm->mmap_sem); | |
93 | mmput(mm); | |
94 | } | |
95 | } | |
ec4dd3eb | 96 | |
a6198797 | 97 | static void *m_start(struct seq_file *m, loff_t *pos) |
e070ad49 | 98 | { |
a6198797 MM |
99 | struct proc_maps_private *priv = m->private; |
100 | unsigned long last_addr = m->version; | |
101 | struct mm_struct *mm; | |
102 | struct vm_area_struct *vma, *tail_vma = NULL; | |
103 | loff_t l = *pos; | |
104 | ||
105 | /* Clear the per syscall fields in priv */ | |
106 | priv->task = NULL; | |
107 | priv->tail_vma = NULL; | |
108 | ||
109 | /* | |
110 | * We remember last_addr rather than next_addr to hit with | |
111 | * mmap_cache most of the time. We have zero last_addr at | |
112 | * the beginning and also after lseek. We will have -1 last_addr | |
113 | * after the end of the vmas. | |
114 | */ | |
115 | ||
116 | if (last_addr == -1UL) | |
117 | return NULL; | |
118 | ||
119 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
120 | if (!priv->task) | |
121 | return NULL; | |
122 | ||
123 | mm = mm_for_maps(priv->task); | |
124 | if (!mm) | |
125 | return NULL; | |
00f89d21 | 126 | down_read(&mm->mmap_sem); |
a6198797 MM |
127 | |
128 | tail_vma = get_gate_vma(priv->task); | |
129 | priv->tail_vma = tail_vma; | |
130 | ||
131 | /* Start with last addr hint */ | |
132 | vma = find_vma(mm, last_addr); | |
133 | if (last_addr && vma) { | |
134 | vma = vma->vm_next; | |
135 | goto out; | |
136 | } | |
137 | ||
138 | /* | |
139 | * Check the vma index is within the range and do | |
140 | * sequential scan until m_index. | |
141 | */ | |
142 | vma = NULL; | |
143 | if ((unsigned long)l < mm->map_count) { | |
144 | vma = mm->mmap; | |
145 | while (l-- && vma) | |
146 | vma = vma->vm_next; | |
147 | goto out; | |
148 | } | |
149 | ||
150 | if (l != mm->map_count) | |
151 | tail_vma = NULL; /* After gate vma */ | |
152 | ||
153 | out: | |
154 | if (vma) | |
155 | return vma; | |
156 | ||
157 | /* End of vmas has been reached */ | |
158 | m->version = (tail_vma != NULL)? 0: -1UL; | |
159 | up_read(&mm->mmap_sem); | |
160 | mmput(mm); | |
161 | return tail_vma; | |
162 | } | |
163 | ||
164 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
165 | { | |
166 | struct proc_maps_private *priv = m->private; | |
167 | struct vm_area_struct *vma = v; | |
168 | struct vm_area_struct *tail_vma = priv->tail_vma; | |
169 | ||
170 | (*pos)++; | |
171 | if (vma && (vma != tail_vma) && vma->vm_next) | |
172 | return vma->vm_next; | |
173 | vma_stop(priv, vma); | |
174 | return (vma != tail_vma)? tail_vma: NULL; | |
175 | } | |
176 | ||
177 | static void m_stop(struct seq_file *m, void *v) | |
178 | { | |
179 | struct proc_maps_private *priv = m->private; | |
180 | struct vm_area_struct *vma = v; | |
181 | ||
182 | vma_stop(priv, vma); | |
183 | if (priv->task) | |
184 | put_task_struct(priv->task); | |
185 | } | |
186 | ||
187 | static int do_maps_open(struct inode *inode, struct file *file, | |
03a44825 | 188 | const struct seq_operations *ops) |
a6198797 MM |
189 | { |
190 | struct proc_maps_private *priv; | |
191 | int ret = -ENOMEM; | |
192 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
193 | if (priv) { | |
194 | priv->pid = proc_pid(inode); | |
195 | ret = seq_open(file, ops); | |
196 | if (!ret) { | |
197 | struct seq_file *m = file->private_data; | |
198 | m->private = priv; | |
199 | } else { | |
200 | kfree(priv); | |
201 | } | |
202 | } | |
203 | return ret; | |
204 | } | |
e070ad49 | 205 | |
7c88db0c | 206 | static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 207 | { |
e070ad49 ML |
208 | struct mm_struct *mm = vma->vm_mm; |
209 | struct file *file = vma->vm_file; | |
210 | int flags = vma->vm_flags; | |
1da177e4 | 211 | unsigned long ino = 0; |
6260a4b0 | 212 | unsigned long long pgoff = 0; |
1da177e4 LT |
213 | dev_t dev = 0; |
214 | int len; | |
215 | ||
216 | if (file) { | |
2fddfeef | 217 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
1da177e4 LT |
218 | dev = inode->i_sb->s_dev; |
219 | ino = inode->i_ino; | |
6260a4b0 | 220 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
221 | } |
222 | ||
1804dc6e | 223 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n", |
e070ad49 ML |
224 | vma->vm_start, |
225 | vma->vm_end, | |
1da177e4 LT |
226 | flags & VM_READ ? 'r' : '-', |
227 | flags & VM_WRITE ? 'w' : '-', | |
228 | flags & VM_EXEC ? 'x' : '-', | |
229 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 230 | pgoff, |
1da177e4 LT |
231 | MAJOR(dev), MINOR(dev), ino, &len); |
232 | ||
233 | /* | |
234 | * Print the dentry name for named mappings, and a | |
235 | * special [heap] marker for the heap: | |
236 | */ | |
e070ad49 | 237 | if (file) { |
1da177e4 | 238 | pad_len_spaces(m, len); |
c32c2f63 | 239 | seq_path(m, &file->f_path, "\n"); |
1da177e4 | 240 | } else { |
e6e5494c IM |
241 | const char *name = arch_vma_name(vma); |
242 | if (!name) { | |
243 | if (mm) { | |
244 | if (vma->vm_start <= mm->start_brk && | |
e070ad49 | 245 | vma->vm_end >= mm->brk) { |
e6e5494c IM |
246 | name = "[heap]"; |
247 | } else if (vma->vm_start <= mm->start_stack && | |
248 | vma->vm_end >= mm->start_stack) { | |
249 | name = "[stack]"; | |
d899bf7b SS |
250 | } else { |
251 | unsigned long stack_start; | |
252 | struct proc_maps_private *pmp; | |
253 | ||
254 | pmp = m->private; | |
255 | stack_start = pmp->task->stack_start; | |
256 | ||
257 | if (vma->vm_start <= stack_start && | |
258 | vma->vm_end >= stack_start) { | |
259 | pad_len_spaces(m, len); | |
260 | seq_printf(m, | |
261 | "[threadstack:%08lx]", | |
262 | #ifdef CONFIG_STACK_GROWSUP | |
263 | vma->vm_end - stack_start | |
264 | #else | |
265 | stack_start - vma->vm_start | |
266 | #endif | |
267 | ); | |
268 | } | |
1da177e4 | 269 | } |
e6e5494c IM |
270 | } else { |
271 | name = "[vdso]"; | |
1da177e4 | 272 | } |
e6e5494c IM |
273 | } |
274 | if (name) { | |
1da177e4 | 275 | pad_len_spaces(m, len); |
e6e5494c | 276 | seq_puts(m, name); |
1da177e4 LT |
277 | } |
278 | } | |
279 | seq_putc(m, '\n'); | |
7c88db0c JK |
280 | } |
281 | ||
282 | static int show_map(struct seq_file *m, void *v) | |
283 | { | |
284 | struct vm_area_struct *vma = v; | |
285 | struct proc_maps_private *priv = m->private; | |
286 | struct task_struct *task = priv->task; | |
287 | ||
288 | show_map_vma(m, vma); | |
e070ad49 | 289 | |
e070ad49 ML |
290 | if (m->count < m->size) /* vma is copied successfully */ |
291 | m->version = (vma != get_gate_vma(task))? vma->vm_start: 0; | |
1da177e4 LT |
292 | return 0; |
293 | } | |
294 | ||
03a44825 | 295 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
296 | .start = m_start, |
297 | .next = m_next, | |
298 | .stop = m_stop, | |
299 | .show = show_map | |
300 | }; | |
301 | ||
302 | static int maps_open(struct inode *inode, struct file *file) | |
303 | { | |
304 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
305 | } | |
306 | ||
307 | const struct file_operations proc_maps_operations = { | |
308 | .open = maps_open, | |
309 | .read = seq_read, | |
310 | .llseek = seq_lseek, | |
311 | .release = seq_release_private, | |
312 | }; | |
313 | ||
314 | /* | |
315 | * Proportional Set Size(PSS): my share of RSS. | |
316 | * | |
317 | * PSS of a process is the count of pages it has in memory, where each | |
318 | * page is divided by the number of processes sharing it. So if a | |
319 | * process has 1000 pages all to itself, and 1000 shared with one other | |
320 | * process, its PSS will be 1500. | |
321 | * | |
322 | * To keep (accumulated) division errors low, we adopt a 64bit | |
323 | * fixed-point pss counter to minimize division errors. So (pss >> | |
324 | * PSS_SHIFT) would be the real byte count. | |
325 | * | |
326 | * A shift of 12 before division means (assuming 4K page size): | |
327 | * - 1M 3-user-pages add up to 8KB errors; | |
328 | * - supports mapcount up to 2^24, or 16M; | |
329 | * - supports PSS up to 2^52 bytes, or 4PB. | |
330 | */ | |
331 | #define PSS_SHIFT 12 | |
332 | ||
1e883281 | 333 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 334 | struct mem_size_stats { |
a6198797 MM |
335 | struct vm_area_struct *vma; |
336 | unsigned long resident; | |
337 | unsigned long shared_clean; | |
338 | unsigned long shared_dirty; | |
339 | unsigned long private_clean; | |
340 | unsigned long private_dirty; | |
341 | unsigned long referenced; | |
214e471f | 342 | unsigned long swap; |
a6198797 MM |
343 | u64 pss; |
344 | }; | |
345 | ||
b3ae5acb | 346 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 347 | struct mm_walk *walk) |
e070ad49 | 348 | { |
2165009b | 349 | struct mem_size_stats *mss = walk->private; |
b3ae5acb | 350 | struct vm_area_struct *vma = mss->vma; |
e070ad49 | 351 | pte_t *pte, ptent; |
705e87c0 | 352 | spinlock_t *ptl; |
e070ad49 | 353 | struct page *page; |
ec4dd3eb | 354 | int mapcount; |
e070ad49 | 355 | |
705e87c0 | 356 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
826fad1b | 357 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
e070ad49 | 358 | ptent = *pte; |
214e471f PZ |
359 | |
360 | if (is_swap_pte(ptent)) { | |
361 | mss->swap += PAGE_SIZE; | |
362 | continue; | |
363 | } | |
364 | ||
705e87c0 | 365 | if (!pte_present(ptent)) |
e070ad49 ML |
366 | continue; |
367 | ||
ad820c5d NP |
368 | page = vm_normal_page(vma, addr, ptent); |
369 | if (!page) | |
e070ad49 ML |
370 | continue; |
371 | ||
7f53a09e | 372 | mss->resident += PAGE_SIZE; |
f79f177c DR |
373 | /* Accumulate the size in pages that have been accessed. */ |
374 | if (pte_young(ptent) || PageReferenced(page)) | |
375 | mss->referenced += PAGE_SIZE; | |
ec4dd3eb FW |
376 | mapcount = page_mapcount(page); |
377 | if (mapcount >= 2) { | |
e070ad49 ML |
378 | if (pte_dirty(ptent)) |
379 | mss->shared_dirty += PAGE_SIZE; | |
380 | else | |
381 | mss->shared_clean += PAGE_SIZE; | |
ec4dd3eb | 382 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; |
e070ad49 ML |
383 | } else { |
384 | if (pte_dirty(ptent)) | |
385 | mss->private_dirty += PAGE_SIZE; | |
386 | else | |
387 | mss->private_clean += PAGE_SIZE; | |
ec4dd3eb | 388 | mss->pss += (PAGE_SIZE << PSS_SHIFT); |
e070ad49 | 389 | } |
826fad1b | 390 | } |
705e87c0 HD |
391 | pte_unmap_unlock(pte - 1, ptl); |
392 | cond_resched(); | |
b3ae5acb | 393 | return 0; |
e070ad49 ML |
394 | } |
395 | ||
e070ad49 ML |
396 | static int show_smap(struct seq_file *m, void *v) |
397 | { | |
7c88db0c JK |
398 | struct proc_maps_private *priv = m->private; |
399 | struct task_struct *task = priv->task; | |
e070ad49 | 400 | struct vm_area_struct *vma = v; |
e070ad49 | 401 | struct mem_size_stats mss; |
2165009b DH |
402 | struct mm_walk smaps_walk = { |
403 | .pmd_entry = smaps_pte_range, | |
404 | .mm = vma->vm_mm, | |
405 | .private = &mss, | |
406 | }; | |
e070ad49 ML |
407 | |
408 | memset(&mss, 0, sizeof mss); | |
b3ae5acb | 409 | mss.vma = vma; |
d82ef020 | 410 | /* mmap_sem is held in m_start */ |
5ddfae16 | 411 | if (vma->vm_mm && !is_vm_hugetlb_page(vma)) |
2165009b | 412 | walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); |
4752c369 | 413 | |
7c88db0c | 414 | show_map_vma(m, vma); |
4752c369 MM |
415 | |
416 | seq_printf(m, | |
417 | "Size: %8lu kB\n" | |
418 | "Rss: %8lu kB\n" | |
419 | "Pss: %8lu kB\n" | |
420 | "Shared_Clean: %8lu kB\n" | |
421 | "Shared_Dirty: %8lu kB\n" | |
422 | "Private_Clean: %8lu kB\n" | |
423 | "Private_Dirty: %8lu kB\n" | |
214e471f | 424 | "Referenced: %8lu kB\n" |
08fba699 | 425 | "Swap: %8lu kB\n" |
3340289d MG |
426 | "KernelPageSize: %8lu kB\n" |
427 | "MMUPageSize: %8lu kB\n", | |
4752c369 MM |
428 | (vma->vm_end - vma->vm_start) >> 10, |
429 | mss.resident >> 10, | |
430 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
431 | mss.shared_clean >> 10, | |
432 | mss.shared_dirty >> 10, | |
433 | mss.private_clean >> 10, | |
434 | mss.private_dirty >> 10, | |
214e471f | 435 | mss.referenced >> 10, |
08fba699 | 436 | mss.swap >> 10, |
3340289d MG |
437 | vma_kernel_pagesize(vma) >> 10, |
438 | vma_mmu_pagesize(vma) >> 10); | |
4752c369 | 439 | |
7c88db0c JK |
440 | if (m->count < m->size) /* vma is copied successfully */ |
441 | m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0; | |
442 | return 0; | |
e070ad49 ML |
443 | } |
444 | ||
03a44825 | 445 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
446 | .start = m_start, |
447 | .next = m_next, | |
448 | .stop = m_stop, | |
449 | .show = show_smap | |
450 | }; | |
451 | ||
452 | static int smaps_open(struct inode *inode, struct file *file) | |
453 | { | |
454 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
455 | } | |
456 | ||
457 | const struct file_operations proc_smaps_operations = { | |
458 | .open = smaps_open, | |
459 | .read = seq_read, | |
460 | .llseek = seq_lseek, | |
461 | .release = seq_release_private, | |
462 | }; | |
463 | ||
464 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, | |
2165009b | 465 | unsigned long end, struct mm_walk *walk) |
a6198797 | 466 | { |
2165009b | 467 | struct vm_area_struct *vma = walk->private; |
a6198797 MM |
468 | pte_t *pte, ptent; |
469 | spinlock_t *ptl; | |
470 | struct page *page; | |
471 | ||
472 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); | |
473 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
474 | ptent = *pte; | |
475 | if (!pte_present(ptent)) | |
476 | continue; | |
477 | ||
478 | page = vm_normal_page(vma, addr, ptent); | |
479 | if (!page) | |
480 | continue; | |
481 | ||
482 | /* Clear accessed and referenced bits. */ | |
483 | ptep_test_and_clear_young(vma, addr, pte); | |
484 | ClearPageReferenced(page); | |
485 | } | |
486 | pte_unmap_unlock(pte - 1, ptl); | |
487 | cond_resched(); | |
488 | return 0; | |
489 | } | |
490 | ||
398499d5 MB |
491 | #define CLEAR_REFS_ALL 1 |
492 | #define CLEAR_REFS_ANON 2 | |
493 | #define CLEAR_REFS_MAPPED 3 | |
494 | ||
f248dcb3 MM |
495 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
496 | size_t count, loff_t *ppos) | |
b813e931 | 497 | { |
f248dcb3 | 498 | struct task_struct *task; |
fb92a4b0 | 499 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 500 | struct mm_struct *mm; |
b813e931 | 501 | struct vm_area_struct *vma; |
fb92a4b0 | 502 | long type; |
b813e931 | 503 | |
f248dcb3 MM |
504 | memset(buffer, 0, sizeof(buffer)); |
505 | if (count > sizeof(buffer) - 1) | |
506 | count = sizeof(buffer) - 1; | |
507 | if (copy_from_user(buffer, buf, count)) | |
508 | return -EFAULT; | |
fb92a4b0 VL |
509 | if (strict_strtol(strstrip(buffer), 10, &type)) |
510 | return -EINVAL; | |
398499d5 | 511 | if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED) |
f248dcb3 | 512 | return -EINVAL; |
f248dcb3 MM |
513 | task = get_proc_task(file->f_path.dentry->d_inode); |
514 | if (!task) | |
515 | return -ESRCH; | |
516 | mm = get_task_mm(task); | |
517 | if (mm) { | |
20cbc972 AM |
518 | struct mm_walk clear_refs_walk = { |
519 | .pmd_entry = clear_refs_pte_range, | |
520 | .mm = mm, | |
521 | }; | |
f248dcb3 | 522 | down_read(&mm->mmap_sem); |
2165009b DH |
523 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
524 | clear_refs_walk.private = vma; | |
398499d5 MB |
525 | if (is_vm_hugetlb_page(vma)) |
526 | continue; | |
527 | /* | |
528 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
529 | * | |
530 | * Writing 2 to /proc/pid/clear_refs only affects | |
531 | * Anonymous pages. | |
532 | * | |
533 | * Writing 3 to /proc/pid/clear_refs only affects file | |
534 | * mapped pages. | |
535 | */ | |
536 | if (type == CLEAR_REFS_ANON && vma->vm_file) | |
537 | continue; | |
538 | if (type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
539 | continue; | |
540 | walk_page_range(vma->vm_start, vma->vm_end, | |
541 | &clear_refs_walk); | |
2165009b | 542 | } |
f248dcb3 MM |
543 | flush_tlb_mm(mm); |
544 | up_read(&mm->mmap_sem); | |
545 | mmput(mm); | |
546 | } | |
547 | put_task_struct(task); | |
fb92a4b0 VL |
548 | |
549 | return count; | |
b813e931 DR |
550 | } |
551 | ||
f248dcb3 MM |
552 | const struct file_operations proc_clear_refs_operations = { |
553 | .write = clear_refs_write, | |
554 | }; | |
555 | ||
85863e47 | 556 | struct pagemapread { |
d82ef020 KH |
557 | int pos, len; |
558 | u64 *buffer; | |
85863e47 MM |
559 | }; |
560 | ||
f16278c6 HR |
561 | #define PM_ENTRY_BYTES sizeof(u64) |
562 | #define PM_STATUS_BITS 3 | |
563 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) | |
564 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) | |
565 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) | |
566 | #define PM_PSHIFT_BITS 6 | |
567 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) | |
568 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) | |
569 | #define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) | |
570 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) | |
571 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) | |
572 | ||
573 | #define PM_PRESENT PM_STATUS(4LL) | |
574 | #define PM_SWAP PM_STATUS(2LL) | |
575 | #define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT) | |
85863e47 MM |
576 | #define PM_END_OF_BUFFER 1 |
577 | ||
578 | static int add_to_pagemap(unsigned long addr, u64 pfn, | |
579 | struct pagemapread *pm) | |
580 | { | |
d82ef020 KH |
581 | pm->buffer[pm->pos++] = pfn; |
582 | if (pm->pos >= pm->len) | |
aae8679b | 583 | return PM_END_OF_BUFFER; |
85863e47 MM |
584 | return 0; |
585 | } | |
586 | ||
587 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 588 | struct mm_walk *walk) |
85863e47 | 589 | { |
2165009b | 590 | struct pagemapread *pm = walk->private; |
85863e47 MM |
591 | unsigned long addr; |
592 | int err = 0; | |
593 | for (addr = start; addr < end; addr += PAGE_SIZE) { | |
594 | err = add_to_pagemap(addr, PM_NOT_PRESENT, pm); | |
595 | if (err) | |
596 | break; | |
597 | } | |
598 | return err; | |
599 | } | |
600 | ||
9d02dbc8 | 601 | static u64 swap_pte_to_pagemap_entry(pte_t pte) |
85863e47 MM |
602 | { |
603 | swp_entry_t e = pte_to_swp_entry(pte); | |
f16278c6 | 604 | return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT); |
85863e47 MM |
605 | } |
606 | ||
49c50342 | 607 | static u64 pte_to_pagemap_entry(pte_t pte) |
bcf8039e | 608 | { |
49c50342 | 609 | u64 pme = 0; |
bcf8039e DH |
610 | if (is_swap_pte(pte)) |
611 | pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte)) | |
612 | | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP; | |
613 | else if (pte_present(pte)) | |
614 | pme = PM_PFRAME(pte_pfn(pte)) | |
615 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; | |
616 | return pme; | |
617 | } | |
618 | ||
85863e47 | 619 | static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 620 | struct mm_walk *walk) |
85863e47 | 621 | { |
bcf8039e | 622 | struct vm_area_struct *vma; |
2165009b | 623 | struct pagemapread *pm = walk->private; |
85863e47 MM |
624 | pte_t *pte; |
625 | int err = 0; | |
626 | ||
bcf8039e DH |
627 | /* find the first VMA at or above 'addr' */ |
628 | vma = find_vma(walk->mm, addr); | |
85863e47 MM |
629 | for (; addr != end; addr += PAGE_SIZE) { |
630 | u64 pfn = PM_NOT_PRESENT; | |
bcf8039e DH |
631 | |
632 | /* check to see if we've left 'vma' behind | |
633 | * and need a new, higher one */ | |
634 | if (vma && (addr >= vma->vm_end)) | |
635 | vma = find_vma(walk->mm, addr); | |
636 | ||
637 | /* check that 'vma' actually covers this address, | |
638 | * and that it isn't a huge page vma */ | |
639 | if (vma && (vma->vm_start <= addr) && | |
640 | !is_vm_hugetlb_page(vma)) { | |
641 | pte = pte_offset_map(pmd, addr); | |
642 | pfn = pte_to_pagemap_entry(*pte); | |
643 | /* unmap before userspace copy */ | |
644 | pte_unmap(pte); | |
645 | } | |
85863e47 MM |
646 | err = add_to_pagemap(addr, pfn, pm); |
647 | if (err) | |
648 | return err; | |
649 | } | |
650 | ||
651 | cond_resched(); | |
652 | ||
653 | return err; | |
654 | } | |
655 | ||
5dc37642 NH |
656 | static u64 huge_pte_to_pagemap_entry(pte_t pte, int offset) |
657 | { | |
658 | u64 pme = 0; | |
659 | if (pte_present(pte)) | |
660 | pme = PM_PFRAME(pte_pfn(pte) + offset) | |
661 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; | |
662 | return pme; | |
663 | } | |
664 | ||
665 | static int pagemap_hugetlb_range(pte_t *pte, unsigned long addr, | |
666 | unsigned long end, struct mm_walk *walk) | |
667 | { | |
668 | struct vm_area_struct *vma; | |
669 | struct pagemapread *pm = walk->private; | |
670 | struct hstate *hs = NULL; | |
671 | int err = 0; | |
672 | ||
673 | vma = find_vma(walk->mm, addr); | |
674 | if (vma) | |
675 | hs = hstate_vma(vma); | |
676 | for (; addr != end; addr += PAGE_SIZE) { | |
677 | u64 pfn = PM_NOT_PRESENT; | |
678 | ||
679 | if (vma && (addr >= vma->vm_end)) { | |
680 | vma = find_vma(walk->mm, addr); | |
681 | if (vma) | |
682 | hs = hstate_vma(vma); | |
683 | } | |
684 | ||
685 | if (vma && (vma->vm_start <= addr) && is_vm_hugetlb_page(vma)) { | |
686 | /* calculate pfn of the "raw" page in the hugepage. */ | |
687 | int offset = (addr & ~huge_page_mask(hs)) >> PAGE_SHIFT; | |
688 | pfn = huge_pte_to_pagemap_entry(*pte, offset); | |
689 | } | |
690 | err = add_to_pagemap(addr, pfn, pm); | |
691 | if (err) | |
692 | return err; | |
693 | } | |
694 | ||
695 | cond_resched(); | |
696 | ||
697 | return err; | |
698 | } | |
699 | ||
85863e47 MM |
700 | /* |
701 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
702 | * | |
f16278c6 HR |
703 | * For each page in the address space, this file contains one 64-bit entry |
704 | * consisting of the following: | |
705 | * | |
706 | * Bits 0-55 page frame number (PFN) if present | |
707 | * Bits 0-4 swap type if swapped | |
708 | * Bits 5-55 swap offset if swapped | |
709 | * Bits 55-60 page shift (page size = 1<<page shift) | |
710 | * Bit 61 reserved for future use | |
711 | * Bit 62 page swapped | |
712 | * Bit 63 page present | |
713 | * | |
714 | * If the page is not present but in swap, then the PFN contains an | |
715 | * encoding of the swap file number and the page's offset into the | |
716 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
717 | * precisely which pages are mapped (or in swap) and comparing mapped |
718 | * pages between processes. | |
719 | * | |
720 | * Efficient users of this interface will use /proc/pid/maps to | |
721 | * determine which areas of memory are actually mapped and llseek to | |
722 | * skip over unmapped regions. | |
723 | */ | |
d82ef020 | 724 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
85863e47 MM |
725 | static ssize_t pagemap_read(struct file *file, char __user *buf, |
726 | size_t count, loff_t *ppos) | |
727 | { | |
728 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
85863e47 MM |
729 | struct mm_struct *mm; |
730 | struct pagemapread pm; | |
85863e47 | 731 | int ret = -ESRCH; |
ee1e6ab6 | 732 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
733 | unsigned long src; |
734 | unsigned long svpfn; | |
735 | unsigned long start_vaddr; | |
736 | unsigned long end_vaddr; | |
d82ef020 | 737 | int copied = 0; |
85863e47 MM |
738 | |
739 | if (!task) | |
740 | goto out; | |
741 | ||
742 | ret = -EACCES; | |
006ebb40 | 743 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
fb39380b | 744 | goto out_task; |
85863e47 MM |
745 | |
746 | ret = -EINVAL; | |
747 | /* file position must be aligned */ | |
aae8679b | 748 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
fb39380b | 749 | goto out_task; |
85863e47 MM |
750 | |
751 | ret = 0; | |
08161786 VM |
752 | |
753 | if (!count) | |
754 | goto out_task; | |
755 | ||
85863e47 MM |
756 | mm = get_task_mm(task); |
757 | if (!mm) | |
fb39380b | 758 | goto out_task; |
85863e47 | 759 | |
d82ef020 KH |
760 | pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
761 | pm.buffer = kmalloc(pm.len, GFP_TEMPORARY); | |
5d7e0d2b | 762 | ret = -ENOMEM; |
d82ef020 | 763 | if (!pm.buffer) |
fb39380b | 764 | goto out_mm; |
85863e47 | 765 | |
5d7e0d2b AM |
766 | pagemap_walk.pmd_entry = pagemap_pte_range; |
767 | pagemap_walk.pte_hole = pagemap_pte_hole; | |
5dc37642 | 768 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
5d7e0d2b AM |
769 | pagemap_walk.mm = mm; |
770 | pagemap_walk.private = ± | |
771 | ||
772 | src = *ppos; | |
773 | svpfn = src / PM_ENTRY_BYTES; | |
774 | start_vaddr = svpfn << PAGE_SHIFT; | |
775 | end_vaddr = TASK_SIZE_OF(task); | |
776 | ||
777 | /* watch out for wraparound */ | |
778 | if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT) | |
779 | start_vaddr = end_vaddr; | |
780 | ||
781 | /* | |
782 | * The odds are that this will stop walking way | |
783 | * before end_vaddr, because the length of the | |
784 | * user buffer is tracked in "pm", and the walk | |
785 | * will stop when we hit the end of the buffer. | |
786 | */ | |
d82ef020 KH |
787 | ret = 0; |
788 | while (count && (start_vaddr < end_vaddr)) { | |
789 | int len; | |
790 | unsigned long end; | |
791 | ||
792 | pm.pos = 0; | |
793 | end = start_vaddr + PAGEMAP_WALK_SIZE; | |
794 | /* overflow ? */ | |
795 | if (end < start_vaddr || end > end_vaddr) | |
796 | end = end_vaddr; | |
797 | down_read(&mm->mmap_sem); | |
798 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
799 | up_read(&mm->mmap_sem); | |
800 | start_vaddr = end; | |
801 | ||
802 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
803 | if (copy_to_user(buf, pm.buffer, len) < 0) { | |
804 | ret = -EFAULT; | |
805 | goto out_free; | |
806 | } | |
807 | copied += len; | |
808 | buf += len; | |
809 | count -= len; | |
85863e47 | 810 | } |
d82ef020 KH |
811 | *ppos += copied; |
812 | if (!ret || ret == PM_END_OF_BUFFER) | |
813 | ret = copied; | |
814 | ||
85863e47 | 815 | out_free: |
d82ef020 | 816 | kfree(pm.buffer); |
fb39380b MT |
817 | out_mm: |
818 | mmput(mm); | |
85863e47 MM |
819 | out_task: |
820 | put_task_struct(task); | |
821 | out: | |
822 | return ret; | |
823 | } | |
824 | ||
825 | const struct file_operations proc_pagemap_operations = { | |
826 | .llseek = mem_lseek, /* borrow this */ | |
827 | .read = pagemap_read, | |
828 | }; | |
1e883281 | 829 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 830 | |
6e21c8f1 | 831 | #ifdef CONFIG_NUMA |
1a75a6c8 | 832 | extern int show_numa_map(struct seq_file *m, void *v); |
6e21c8f1 | 833 | |
03a44825 | 834 | static const struct seq_operations proc_pid_numa_maps_op = { |
1a75a6c8 CL |
835 | .start = m_start, |
836 | .next = m_next, | |
837 | .stop = m_stop, | |
3bbfe059 | 838 | .show = show_numa_map, |
6e21c8f1 | 839 | }; |
662795de EB |
840 | |
841 | static int numa_maps_open(struct inode *inode, struct file *file) | |
842 | { | |
843 | return do_maps_open(inode, file, &proc_pid_numa_maps_op); | |
844 | } | |
845 | ||
00977a59 | 846 | const struct file_operations proc_numa_maps_operations = { |
662795de EB |
847 | .open = numa_maps_open, |
848 | .read = seq_read, | |
849 | .llseek = seq_lseek, | |
99f89551 | 850 | .release = seq_release_private, |
662795de | 851 | }; |
6e21c8f1 | 852 | #endif |