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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 | ||
a2ade7b6 AD |
69 | unsigned long task_statm(struct mm_struct *mm, |
70 | unsigned long *shared, unsigned long *text, | |
71 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 72 | { |
d559db08 | 73 | *shared = get_mm_counter(mm, MM_FILEPAGES); |
1da177e4 LT |
74 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
75 | >> PAGE_SHIFT; | |
76 | *data = mm->total_vm - mm->shared_vm; | |
d559db08 | 77 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
78 | return mm->total_vm; |
79 | } | |
80 | ||
1da177e4 LT |
81 | static void pad_len_spaces(struct seq_file *m, int len) |
82 | { | |
83 | len = 25 + sizeof(void*) * 6 - len; | |
84 | if (len < 1) | |
85 | len = 1; | |
86 | seq_printf(m, "%*c", len, ' '); | |
87 | } | |
88 | ||
a6198797 MM |
89 | static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma) |
90 | { | |
91 | if (vma && vma != priv->tail_vma) { | |
92 | struct mm_struct *mm = vma->vm_mm; | |
93 | up_read(&mm->mmap_sem); | |
94 | mmput(mm); | |
95 | } | |
96 | } | |
ec4dd3eb | 97 | |
a6198797 | 98 | static void *m_start(struct seq_file *m, loff_t *pos) |
e070ad49 | 99 | { |
a6198797 MM |
100 | struct proc_maps_private *priv = m->private; |
101 | unsigned long last_addr = m->version; | |
102 | struct mm_struct *mm; | |
103 | struct vm_area_struct *vma, *tail_vma = NULL; | |
104 | loff_t l = *pos; | |
105 | ||
106 | /* Clear the per syscall fields in priv */ | |
107 | priv->task = NULL; | |
108 | priv->tail_vma = NULL; | |
109 | ||
110 | /* | |
111 | * We remember last_addr rather than next_addr to hit with | |
112 | * mmap_cache most of the time. We have zero last_addr at | |
113 | * the beginning and also after lseek. We will have -1 last_addr | |
114 | * after the end of the vmas. | |
115 | */ | |
116 | ||
117 | if (last_addr == -1UL) | |
118 | return NULL; | |
119 | ||
120 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
121 | if (!priv->task) | |
122 | return NULL; | |
123 | ||
124 | mm = mm_for_maps(priv->task); | |
125 | if (!mm) | |
126 | return NULL; | |
00f89d21 | 127 | down_read(&mm->mmap_sem); |
a6198797 MM |
128 | |
129 | tail_vma = get_gate_vma(priv->task); | |
130 | priv->tail_vma = tail_vma; | |
131 | ||
132 | /* Start with last addr hint */ | |
133 | vma = find_vma(mm, last_addr); | |
134 | if (last_addr && vma) { | |
135 | vma = vma->vm_next; | |
136 | goto out; | |
137 | } | |
138 | ||
139 | /* | |
140 | * Check the vma index is within the range and do | |
141 | * sequential scan until m_index. | |
142 | */ | |
143 | vma = NULL; | |
144 | if ((unsigned long)l < mm->map_count) { | |
145 | vma = mm->mmap; | |
146 | while (l-- && vma) | |
147 | vma = vma->vm_next; | |
148 | goto out; | |
149 | } | |
150 | ||
151 | if (l != mm->map_count) | |
152 | tail_vma = NULL; /* After gate vma */ | |
153 | ||
154 | out: | |
155 | if (vma) | |
156 | return vma; | |
157 | ||
158 | /* End of vmas has been reached */ | |
159 | m->version = (tail_vma != NULL)? 0: -1UL; | |
160 | up_read(&mm->mmap_sem); | |
161 | mmput(mm); | |
162 | return tail_vma; | |
163 | } | |
164 | ||
165 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
166 | { | |
167 | struct proc_maps_private *priv = m->private; | |
168 | struct vm_area_struct *vma = v; | |
169 | struct vm_area_struct *tail_vma = priv->tail_vma; | |
170 | ||
171 | (*pos)++; | |
172 | if (vma && (vma != tail_vma) && vma->vm_next) | |
173 | return vma->vm_next; | |
174 | vma_stop(priv, vma); | |
175 | return (vma != tail_vma)? tail_vma: NULL; | |
176 | } | |
177 | ||
178 | static void m_stop(struct seq_file *m, void *v) | |
179 | { | |
180 | struct proc_maps_private *priv = m->private; | |
181 | struct vm_area_struct *vma = v; | |
182 | ||
183 | vma_stop(priv, vma); | |
184 | if (priv->task) | |
185 | put_task_struct(priv->task); | |
186 | } | |
187 | ||
188 | static int do_maps_open(struct inode *inode, struct file *file, | |
03a44825 | 189 | const struct seq_operations *ops) |
a6198797 MM |
190 | { |
191 | struct proc_maps_private *priv; | |
192 | int ret = -ENOMEM; | |
193 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
194 | if (priv) { | |
195 | priv->pid = proc_pid(inode); | |
196 | ret = seq_open(file, ops); | |
197 | if (!ret) { | |
198 | struct seq_file *m = file->private_data; | |
199 | m->private = priv; | |
200 | } else { | |
201 | kfree(priv); | |
202 | } | |
203 | } | |
204 | return ret; | |
205 | } | |
e070ad49 | 206 | |
7c88db0c | 207 | static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 208 | { |
e070ad49 ML |
209 | struct mm_struct *mm = vma->vm_mm; |
210 | struct file *file = vma->vm_file; | |
211 | int flags = vma->vm_flags; | |
1da177e4 | 212 | unsigned long ino = 0; |
6260a4b0 | 213 | unsigned long long pgoff = 0; |
d7824370 | 214 | unsigned long start; |
1da177e4 LT |
215 | dev_t dev = 0; |
216 | int len; | |
217 | ||
218 | if (file) { | |
2fddfeef | 219 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
1da177e4 LT |
220 | dev = inode->i_sb->s_dev; |
221 | ino = inode->i_ino; | |
6260a4b0 | 222 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
223 | } |
224 | ||
d7824370 LT |
225 | /* We don't show the stack guard page in /proc/maps */ |
226 | start = vma->vm_start; | |
227 | if (vma->vm_flags & VM_GROWSDOWN) | |
39aa3cb3 SB |
228 | if (!vma_stack_continue(vma->vm_prev, vma->vm_start)) |
229 | start += PAGE_SIZE; | |
d7824370 | 230 | |
1804dc6e | 231 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n", |
d7824370 | 232 | start, |
e070ad49 | 233 | vma->vm_end, |
1da177e4 LT |
234 | flags & VM_READ ? 'r' : '-', |
235 | flags & VM_WRITE ? 'w' : '-', | |
236 | flags & VM_EXEC ? 'x' : '-', | |
237 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 238 | pgoff, |
1da177e4 LT |
239 | MAJOR(dev), MINOR(dev), ino, &len); |
240 | ||
241 | /* | |
242 | * Print the dentry name for named mappings, and a | |
243 | * special [heap] marker for the heap: | |
244 | */ | |
e070ad49 | 245 | if (file) { |
1da177e4 | 246 | pad_len_spaces(m, len); |
c32c2f63 | 247 | seq_path(m, &file->f_path, "\n"); |
1da177e4 | 248 | } else { |
e6e5494c IM |
249 | const char *name = arch_vma_name(vma); |
250 | if (!name) { | |
251 | if (mm) { | |
252 | if (vma->vm_start <= mm->start_brk && | |
e070ad49 | 253 | vma->vm_end >= mm->brk) { |
e6e5494c IM |
254 | name = "[heap]"; |
255 | } else if (vma->vm_start <= mm->start_stack && | |
256 | vma->vm_end >= mm->start_stack) { | |
257 | name = "[stack]"; | |
1da177e4 | 258 | } |
e6e5494c IM |
259 | } else { |
260 | name = "[vdso]"; | |
1da177e4 | 261 | } |
e6e5494c IM |
262 | } |
263 | if (name) { | |
1da177e4 | 264 | pad_len_spaces(m, len); |
e6e5494c | 265 | seq_puts(m, name); |
1da177e4 LT |
266 | } |
267 | } | |
268 | seq_putc(m, '\n'); | |
7c88db0c JK |
269 | } |
270 | ||
271 | static int show_map(struct seq_file *m, void *v) | |
272 | { | |
273 | struct vm_area_struct *vma = v; | |
274 | struct proc_maps_private *priv = m->private; | |
275 | struct task_struct *task = priv->task; | |
276 | ||
277 | show_map_vma(m, vma); | |
e070ad49 | 278 | |
e070ad49 ML |
279 | if (m->count < m->size) /* vma is copied successfully */ |
280 | m->version = (vma != get_gate_vma(task))? vma->vm_start: 0; | |
1da177e4 LT |
281 | return 0; |
282 | } | |
283 | ||
03a44825 | 284 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
285 | .start = m_start, |
286 | .next = m_next, | |
287 | .stop = m_stop, | |
288 | .show = show_map | |
289 | }; | |
290 | ||
291 | static int maps_open(struct inode *inode, struct file *file) | |
292 | { | |
293 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
294 | } | |
295 | ||
296 | const struct file_operations proc_maps_operations = { | |
297 | .open = maps_open, | |
298 | .read = seq_read, | |
299 | .llseek = seq_lseek, | |
300 | .release = seq_release_private, | |
301 | }; | |
302 | ||
303 | /* | |
304 | * Proportional Set Size(PSS): my share of RSS. | |
305 | * | |
306 | * PSS of a process is the count of pages it has in memory, where each | |
307 | * page is divided by the number of processes sharing it. So if a | |
308 | * process has 1000 pages all to itself, and 1000 shared with one other | |
309 | * process, its PSS will be 1500. | |
310 | * | |
311 | * To keep (accumulated) division errors low, we adopt a 64bit | |
312 | * fixed-point pss counter to minimize division errors. So (pss >> | |
313 | * PSS_SHIFT) would be the real byte count. | |
314 | * | |
315 | * A shift of 12 before division means (assuming 4K page size): | |
316 | * - 1M 3-user-pages add up to 8KB errors; | |
317 | * - supports mapcount up to 2^24, or 16M; | |
318 | * - supports PSS up to 2^52 bytes, or 4PB. | |
319 | */ | |
320 | #define PSS_SHIFT 12 | |
321 | ||
1e883281 | 322 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 323 | struct mem_size_stats { |
a6198797 MM |
324 | struct vm_area_struct *vma; |
325 | unsigned long resident; | |
326 | unsigned long shared_clean; | |
327 | unsigned long shared_dirty; | |
328 | unsigned long private_clean; | |
329 | unsigned long private_dirty; | |
330 | unsigned long referenced; | |
b40d4f84 | 331 | unsigned long anonymous; |
214e471f | 332 | unsigned long swap; |
a6198797 MM |
333 | u64 pss; |
334 | }; | |
335 | ||
b3ae5acb | 336 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 337 | struct mm_walk *walk) |
e070ad49 | 338 | { |
2165009b | 339 | struct mem_size_stats *mss = walk->private; |
b3ae5acb | 340 | struct vm_area_struct *vma = mss->vma; |
e070ad49 | 341 | pte_t *pte, ptent; |
705e87c0 | 342 | spinlock_t *ptl; |
e070ad49 | 343 | struct page *page; |
ec4dd3eb | 344 | int mapcount; |
e070ad49 | 345 | |
03319327 DH |
346 | split_huge_page_pmd(walk->mm, pmd); |
347 | ||
705e87c0 | 348 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
826fad1b | 349 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
e070ad49 | 350 | ptent = *pte; |
214e471f PZ |
351 | |
352 | if (is_swap_pte(ptent)) { | |
353 | mss->swap += PAGE_SIZE; | |
354 | continue; | |
355 | } | |
356 | ||
705e87c0 | 357 | if (!pte_present(ptent)) |
e070ad49 ML |
358 | continue; |
359 | ||
ad820c5d NP |
360 | page = vm_normal_page(vma, addr, ptent); |
361 | if (!page) | |
e070ad49 ML |
362 | continue; |
363 | ||
b40d4f84 NK |
364 | if (PageAnon(page)) |
365 | mss->anonymous += PAGE_SIZE; | |
366 | ||
7f53a09e | 367 | mss->resident += PAGE_SIZE; |
f79f177c DR |
368 | /* Accumulate the size in pages that have been accessed. */ |
369 | if (pte_young(ptent) || PageReferenced(page)) | |
370 | mss->referenced += PAGE_SIZE; | |
ec4dd3eb FW |
371 | mapcount = page_mapcount(page); |
372 | if (mapcount >= 2) { | |
1c2499ae | 373 | if (pte_dirty(ptent) || PageDirty(page)) |
e070ad49 ML |
374 | mss->shared_dirty += PAGE_SIZE; |
375 | else | |
376 | mss->shared_clean += PAGE_SIZE; | |
ec4dd3eb | 377 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; |
e070ad49 | 378 | } else { |
1c2499ae | 379 | if (pte_dirty(ptent) || PageDirty(page)) |
e070ad49 ML |
380 | mss->private_dirty += PAGE_SIZE; |
381 | else | |
382 | mss->private_clean += PAGE_SIZE; | |
ec4dd3eb | 383 | mss->pss += (PAGE_SIZE << PSS_SHIFT); |
e070ad49 | 384 | } |
826fad1b | 385 | } |
705e87c0 HD |
386 | pte_unmap_unlock(pte - 1, ptl); |
387 | cond_resched(); | |
b3ae5acb | 388 | return 0; |
e070ad49 ML |
389 | } |
390 | ||
e070ad49 ML |
391 | static int show_smap(struct seq_file *m, void *v) |
392 | { | |
7c88db0c JK |
393 | struct proc_maps_private *priv = m->private; |
394 | struct task_struct *task = priv->task; | |
e070ad49 | 395 | struct vm_area_struct *vma = v; |
e070ad49 | 396 | struct mem_size_stats mss; |
2165009b DH |
397 | struct mm_walk smaps_walk = { |
398 | .pmd_entry = smaps_pte_range, | |
399 | .mm = vma->vm_mm, | |
400 | .private = &mss, | |
401 | }; | |
e070ad49 ML |
402 | |
403 | memset(&mss, 0, sizeof mss); | |
b3ae5acb | 404 | mss.vma = vma; |
d82ef020 | 405 | /* mmap_sem is held in m_start */ |
5ddfae16 | 406 | if (vma->vm_mm && !is_vm_hugetlb_page(vma)) |
2165009b | 407 | walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); |
4752c369 | 408 | |
7c88db0c | 409 | show_map_vma(m, vma); |
4752c369 MM |
410 | |
411 | seq_printf(m, | |
412 | "Size: %8lu kB\n" | |
413 | "Rss: %8lu kB\n" | |
414 | "Pss: %8lu kB\n" | |
415 | "Shared_Clean: %8lu kB\n" | |
416 | "Shared_Dirty: %8lu kB\n" | |
417 | "Private_Clean: %8lu kB\n" | |
418 | "Private_Dirty: %8lu kB\n" | |
214e471f | 419 | "Referenced: %8lu kB\n" |
b40d4f84 | 420 | "Anonymous: %8lu kB\n" |
08fba699 | 421 | "Swap: %8lu kB\n" |
3340289d | 422 | "KernelPageSize: %8lu kB\n" |
2d90508f NK |
423 | "MMUPageSize: %8lu kB\n" |
424 | "Locked: %8lu kB\n", | |
4752c369 MM |
425 | (vma->vm_end - vma->vm_start) >> 10, |
426 | mss.resident >> 10, | |
427 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
428 | mss.shared_clean >> 10, | |
429 | mss.shared_dirty >> 10, | |
430 | mss.private_clean >> 10, | |
431 | mss.private_dirty >> 10, | |
214e471f | 432 | mss.referenced >> 10, |
b40d4f84 | 433 | mss.anonymous >> 10, |
08fba699 | 434 | mss.swap >> 10, |
3340289d | 435 | vma_kernel_pagesize(vma) >> 10, |
2d90508f NK |
436 | vma_mmu_pagesize(vma) >> 10, |
437 | (vma->vm_flags & VM_LOCKED) ? | |
438 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); | |
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 | ||
03319327 DH |
472 | split_huge_page_pmd(walk->mm, pmd); |
473 | ||
a6198797 MM |
474 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
475 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
476 | ptent = *pte; | |
477 | if (!pte_present(ptent)) | |
478 | continue; | |
479 | ||
480 | page = vm_normal_page(vma, addr, ptent); | |
481 | if (!page) | |
482 | continue; | |
483 | ||
484 | /* Clear accessed and referenced bits. */ | |
485 | ptep_test_and_clear_young(vma, addr, pte); | |
486 | ClearPageReferenced(page); | |
487 | } | |
488 | pte_unmap_unlock(pte - 1, ptl); | |
489 | cond_resched(); | |
490 | return 0; | |
491 | } | |
492 | ||
398499d5 MB |
493 | #define CLEAR_REFS_ALL 1 |
494 | #define CLEAR_REFS_ANON 2 | |
495 | #define CLEAR_REFS_MAPPED 3 | |
496 | ||
f248dcb3 MM |
497 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
498 | size_t count, loff_t *ppos) | |
b813e931 | 499 | { |
f248dcb3 | 500 | struct task_struct *task; |
fb92a4b0 | 501 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 502 | struct mm_struct *mm; |
b813e931 | 503 | struct vm_area_struct *vma; |
fb92a4b0 | 504 | long type; |
b813e931 | 505 | |
f248dcb3 MM |
506 | memset(buffer, 0, sizeof(buffer)); |
507 | if (count > sizeof(buffer) - 1) | |
508 | count = sizeof(buffer) - 1; | |
509 | if (copy_from_user(buffer, buf, count)) | |
510 | return -EFAULT; | |
fb92a4b0 VL |
511 | if (strict_strtol(strstrip(buffer), 10, &type)) |
512 | return -EINVAL; | |
398499d5 | 513 | if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED) |
f248dcb3 | 514 | return -EINVAL; |
f248dcb3 MM |
515 | task = get_proc_task(file->f_path.dentry->d_inode); |
516 | if (!task) | |
517 | return -ESRCH; | |
518 | mm = get_task_mm(task); | |
519 | if (mm) { | |
20cbc972 AM |
520 | struct mm_walk clear_refs_walk = { |
521 | .pmd_entry = clear_refs_pte_range, | |
522 | .mm = mm, | |
523 | }; | |
f248dcb3 | 524 | down_read(&mm->mmap_sem); |
2165009b DH |
525 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
526 | clear_refs_walk.private = vma; | |
398499d5 MB |
527 | if (is_vm_hugetlb_page(vma)) |
528 | continue; | |
529 | /* | |
530 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
531 | * | |
532 | * Writing 2 to /proc/pid/clear_refs only affects | |
533 | * Anonymous pages. | |
534 | * | |
535 | * Writing 3 to /proc/pid/clear_refs only affects file | |
536 | * mapped pages. | |
537 | */ | |
538 | if (type == CLEAR_REFS_ANON && vma->vm_file) | |
539 | continue; | |
540 | if (type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
541 | continue; | |
542 | walk_page_range(vma->vm_start, vma->vm_end, | |
543 | &clear_refs_walk); | |
2165009b | 544 | } |
f248dcb3 MM |
545 | flush_tlb_mm(mm); |
546 | up_read(&mm->mmap_sem); | |
547 | mmput(mm); | |
548 | } | |
549 | put_task_struct(task); | |
fb92a4b0 VL |
550 | |
551 | return count; | |
b813e931 DR |
552 | } |
553 | ||
f248dcb3 MM |
554 | const struct file_operations proc_clear_refs_operations = { |
555 | .write = clear_refs_write, | |
6038f373 | 556 | .llseek = noop_llseek, |
f248dcb3 MM |
557 | }; |
558 | ||
85863e47 | 559 | struct pagemapread { |
d82ef020 KH |
560 | int pos, len; |
561 | u64 *buffer; | |
85863e47 MM |
562 | }; |
563 | ||
f16278c6 HR |
564 | #define PM_ENTRY_BYTES sizeof(u64) |
565 | #define PM_STATUS_BITS 3 | |
566 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) | |
567 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) | |
568 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) | |
569 | #define PM_PSHIFT_BITS 6 | |
570 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) | |
571 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) | |
572 | #define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) | |
573 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) | |
574 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) | |
575 | ||
576 | #define PM_PRESENT PM_STATUS(4LL) | |
577 | #define PM_SWAP PM_STATUS(2LL) | |
578 | #define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT) | |
85863e47 MM |
579 | #define PM_END_OF_BUFFER 1 |
580 | ||
581 | static int add_to_pagemap(unsigned long addr, u64 pfn, | |
582 | struct pagemapread *pm) | |
583 | { | |
d82ef020 KH |
584 | pm->buffer[pm->pos++] = pfn; |
585 | if (pm->pos >= pm->len) | |
aae8679b | 586 | return PM_END_OF_BUFFER; |
85863e47 MM |
587 | return 0; |
588 | } | |
589 | ||
590 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 591 | struct mm_walk *walk) |
85863e47 | 592 | { |
2165009b | 593 | struct pagemapread *pm = walk->private; |
85863e47 MM |
594 | unsigned long addr; |
595 | int err = 0; | |
596 | for (addr = start; addr < end; addr += PAGE_SIZE) { | |
597 | err = add_to_pagemap(addr, PM_NOT_PRESENT, pm); | |
598 | if (err) | |
599 | break; | |
600 | } | |
601 | return err; | |
602 | } | |
603 | ||
9d02dbc8 | 604 | static u64 swap_pte_to_pagemap_entry(pte_t pte) |
85863e47 MM |
605 | { |
606 | swp_entry_t e = pte_to_swp_entry(pte); | |
f16278c6 | 607 | return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT); |
85863e47 MM |
608 | } |
609 | ||
49c50342 | 610 | static u64 pte_to_pagemap_entry(pte_t pte) |
bcf8039e | 611 | { |
49c50342 | 612 | u64 pme = 0; |
bcf8039e DH |
613 | if (is_swap_pte(pte)) |
614 | pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte)) | |
615 | | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP; | |
616 | else if (pte_present(pte)) | |
617 | pme = PM_PFRAME(pte_pfn(pte)) | |
618 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; | |
619 | return pme; | |
620 | } | |
621 | ||
85863e47 | 622 | static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 623 | struct mm_walk *walk) |
85863e47 | 624 | { |
bcf8039e | 625 | struct vm_area_struct *vma; |
2165009b | 626 | struct pagemapread *pm = walk->private; |
85863e47 MM |
627 | pte_t *pte; |
628 | int err = 0; | |
629 | ||
03319327 DH |
630 | split_huge_page_pmd(walk->mm, pmd); |
631 | ||
bcf8039e DH |
632 | /* find the first VMA at or above 'addr' */ |
633 | vma = find_vma(walk->mm, addr); | |
85863e47 MM |
634 | for (; addr != end; addr += PAGE_SIZE) { |
635 | u64 pfn = PM_NOT_PRESENT; | |
bcf8039e DH |
636 | |
637 | /* check to see if we've left 'vma' behind | |
638 | * and need a new, higher one */ | |
639 | if (vma && (addr >= vma->vm_end)) | |
640 | vma = find_vma(walk->mm, addr); | |
641 | ||
642 | /* check that 'vma' actually covers this address, | |
643 | * and that it isn't a huge page vma */ | |
644 | if (vma && (vma->vm_start <= addr) && | |
645 | !is_vm_hugetlb_page(vma)) { | |
646 | pte = pte_offset_map(pmd, addr); | |
647 | pfn = pte_to_pagemap_entry(*pte); | |
648 | /* unmap before userspace copy */ | |
649 | pte_unmap(pte); | |
650 | } | |
85863e47 MM |
651 | err = add_to_pagemap(addr, pfn, pm); |
652 | if (err) | |
653 | return err; | |
654 | } | |
655 | ||
656 | cond_resched(); | |
657 | ||
658 | return err; | |
659 | } | |
660 | ||
1a5cb814 | 661 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 NH |
662 | static u64 huge_pte_to_pagemap_entry(pte_t pte, int offset) |
663 | { | |
664 | u64 pme = 0; | |
665 | if (pte_present(pte)) | |
666 | pme = PM_PFRAME(pte_pfn(pte) + offset) | |
667 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; | |
668 | return pme; | |
669 | } | |
670 | ||
116354d1 NH |
671 | /* This function walks within one hugetlb entry in the single call */ |
672 | static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, | |
673 | unsigned long addr, unsigned long end, | |
674 | struct mm_walk *walk) | |
5dc37642 | 675 | { |
5dc37642 | 676 | struct pagemapread *pm = walk->private; |
5dc37642 | 677 | int err = 0; |
116354d1 | 678 | u64 pfn; |
5dc37642 | 679 | |
5dc37642 | 680 | for (; addr != end; addr += PAGE_SIZE) { |
116354d1 NH |
681 | int offset = (addr & ~hmask) >> PAGE_SHIFT; |
682 | pfn = huge_pte_to_pagemap_entry(*pte, offset); | |
5dc37642 NH |
683 | err = add_to_pagemap(addr, pfn, pm); |
684 | if (err) | |
685 | return err; | |
686 | } | |
687 | ||
688 | cond_resched(); | |
689 | ||
690 | return err; | |
691 | } | |
1a5cb814 | 692 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 693 | |
85863e47 MM |
694 | /* |
695 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
696 | * | |
f16278c6 HR |
697 | * For each page in the address space, this file contains one 64-bit entry |
698 | * consisting of the following: | |
699 | * | |
700 | * Bits 0-55 page frame number (PFN) if present | |
701 | * Bits 0-4 swap type if swapped | |
702 | * Bits 5-55 swap offset if swapped | |
703 | * Bits 55-60 page shift (page size = 1<<page shift) | |
704 | * Bit 61 reserved for future use | |
705 | * Bit 62 page swapped | |
706 | * Bit 63 page present | |
707 | * | |
708 | * If the page is not present but in swap, then the PFN contains an | |
709 | * encoding of the swap file number and the page's offset into the | |
710 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
711 | * precisely which pages are mapped (or in swap) and comparing mapped |
712 | * pages between processes. | |
713 | * | |
714 | * Efficient users of this interface will use /proc/pid/maps to | |
715 | * determine which areas of memory are actually mapped and llseek to | |
716 | * skip over unmapped regions. | |
717 | */ | |
d82ef020 | 718 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
ea251c1d | 719 | #define PAGEMAP_WALK_MASK (PMD_MASK) |
85863e47 MM |
720 | static ssize_t pagemap_read(struct file *file, char __user *buf, |
721 | size_t count, loff_t *ppos) | |
722 | { | |
723 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
85863e47 MM |
724 | struct mm_struct *mm; |
725 | struct pagemapread pm; | |
85863e47 | 726 | int ret = -ESRCH; |
ee1e6ab6 | 727 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
728 | unsigned long src; |
729 | unsigned long svpfn; | |
730 | unsigned long start_vaddr; | |
731 | unsigned long end_vaddr; | |
d82ef020 | 732 | int copied = 0; |
85863e47 MM |
733 | |
734 | if (!task) | |
735 | goto out; | |
736 | ||
737 | ret = -EACCES; | |
006ebb40 | 738 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
fb39380b | 739 | goto out_task; |
85863e47 MM |
740 | |
741 | ret = -EINVAL; | |
742 | /* file position must be aligned */ | |
aae8679b | 743 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
fb39380b | 744 | goto out_task; |
85863e47 MM |
745 | |
746 | ret = 0; | |
08161786 VM |
747 | |
748 | if (!count) | |
749 | goto out_task; | |
750 | ||
85863e47 MM |
751 | mm = get_task_mm(task); |
752 | if (!mm) | |
fb39380b | 753 | goto out_task; |
85863e47 | 754 | |
d82ef020 KH |
755 | pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
756 | pm.buffer = kmalloc(pm.len, GFP_TEMPORARY); | |
5d7e0d2b | 757 | ret = -ENOMEM; |
d82ef020 | 758 | if (!pm.buffer) |
fb39380b | 759 | goto out_mm; |
85863e47 | 760 | |
5d7e0d2b AM |
761 | pagemap_walk.pmd_entry = pagemap_pte_range; |
762 | pagemap_walk.pte_hole = pagemap_pte_hole; | |
1a5cb814 | 763 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 764 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 765 | #endif |
5d7e0d2b AM |
766 | pagemap_walk.mm = mm; |
767 | pagemap_walk.private = ± | |
768 | ||
769 | src = *ppos; | |
770 | svpfn = src / PM_ENTRY_BYTES; | |
771 | start_vaddr = svpfn << PAGE_SHIFT; | |
772 | end_vaddr = TASK_SIZE_OF(task); | |
773 | ||
774 | /* watch out for wraparound */ | |
775 | if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT) | |
776 | start_vaddr = end_vaddr; | |
777 | ||
778 | /* | |
779 | * The odds are that this will stop walking way | |
780 | * before end_vaddr, because the length of the | |
781 | * user buffer is tracked in "pm", and the walk | |
782 | * will stop when we hit the end of the buffer. | |
783 | */ | |
d82ef020 KH |
784 | ret = 0; |
785 | while (count && (start_vaddr < end_vaddr)) { | |
786 | int len; | |
787 | unsigned long end; | |
788 | ||
789 | pm.pos = 0; | |
ea251c1d | 790 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
791 | /* overflow ? */ |
792 | if (end < start_vaddr || end > end_vaddr) | |
793 | end = end_vaddr; | |
794 | down_read(&mm->mmap_sem); | |
795 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
796 | up_read(&mm->mmap_sem); | |
797 | start_vaddr = end; | |
798 | ||
799 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 800 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 KH |
801 | ret = -EFAULT; |
802 | goto out_free; | |
803 | } | |
804 | copied += len; | |
805 | buf += len; | |
806 | count -= len; | |
85863e47 | 807 | } |
d82ef020 KH |
808 | *ppos += copied; |
809 | if (!ret || ret == PM_END_OF_BUFFER) | |
810 | ret = copied; | |
811 | ||
85863e47 | 812 | out_free: |
d82ef020 | 813 | kfree(pm.buffer); |
fb39380b MT |
814 | out_mm: |
815 | mmput(mm); | |
85863e47 MM |
816 | out_task: |
817 | put_task_struct(task); | |
818 | out: | |
819 | return ret; | |
820 | } | |
821 | ||
822 | const struct file_operations proc_pagemap_operations = { | |
823 | .llseek = mem_lseek, /* borrow this */ | |
824 | .read = pagemap_read, | |
825 | }; | |
1e883281 | 826 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 827 | |
6e21c8f1 | 828 | #ifdef CONFIG_NUMA |
1a75a6c8 | 829 | extern int show_numa_map(struct seq_file *m, void *v); |
6e21c8f1 | 830 | |
03a44825 | 831 | static const struct seq_operations proc_pid_numa_maps_op = { |
1a75a6c8 CL |
832 | .start = m_start, |
833 | .next = m_next, | |
834 | .stop = m_stop, | |
3bbfe059 | 835 | .show = show_numa_map, |
6e21c8f1 | 836 | }; |
662795de EB |
837 | |
838 | static int numa_maps_open(struct inode *inode, struct file *file) | |
839 | { | |
840 | return do_maps_open(inode, file, &proc_pid_numa_maps_op); | |
841 | } | |
842 | ||
00977a59 | 843 | const struct file_operations proc_numa_maps_operations = { |
662795de EB |
844 | .open = numa_maps_open, |
845 | .read = seq_read, | |
846 | .llseek = seq_lseek, | |
99f89551 | 847 | .release = seq_release_private, |
662795de | 848 | }; |
6e21c8f1 | 849 | #endif |