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Commit | Line | Data |
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1da177e4 LT |
1 | #include <linux/mm.h> |
2 | #include <linux/hugetlb.h> | |
22e057c5 | 3 | #include <linux/huge_mm.h> |
1da177e4 LT |
4 | #include <linux/mount.h> |
5 | #include <linux/seq_file.h> | |
e070ad49 | 6 | #include <linux/highmem.h> |
5096add8 | 7 | #include <linux/ptrace.h> |
5a0e3ad6 | 8 | #include <linux/slab.h> |
6e21c8f1 CL |
9 | #include <linux/pagemap.h> |
10 | #include <linux/mempolicy.h> | |
22e057c5 | 11 | #include <linux/rmap.h> |
85863e47 MM |
12 | #include <linux/swap.h> |
13 | #include <linux/swapops.h> | |
e070ad49 | 14 | |
1da177e4 LT |
15 | #include <asm/elf.h> |
16 | #include <asm/uaccess.h> | |
e070ad49 | 17 | #include <asm/tlbflush.h> |
1da177e4 LT |
18 | #include "internal.h" |
19 | ||
df5f8314 | 20 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 21 | { |
b084d435 | 22 | unsigned long data, text, lib, swap; |
365e9c87 HD |
23 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
24 | ||
25 | /* | |
26 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
27 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
28 | * collector of these hiwater stats must therefore get total_vm | |
29 | * and rss too, which will usually be the higher. Barriers? not | |
30 | * worth the effort, such snapshots can always be inconsistent. | |
31 | */ | |
32 | hiwater_vm = total_vm = mm->total_vm; | |
33 | if (hiwater_vm < mm->hiwater_vm) | |
34 | hiwater_vm = mm->hiwater_vm; | |
35 | hiwater_rss = total_rss = get_mm_rss(mm); | |
36 | if (hiwater_rss < mm->hiwater_rss) | |
37 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 LT |
38 | |
39 | data = mm->total_vm - mm->shared_vm - mm->stack_vm; | |
40 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; | |
41 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 42 | swap = get_mm_counter(mm, MM_SWAPENTS); |
df5f8314 | 43 | seq_printf(m, |
365e9c87 | 44 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
45 | "VmSize:\t%8lu kB\n" |
46 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 47 | "VmPin:\t%8lu kB\n" |
365e9c87 | 48 | "VmHWM:\t%8lu kB\n" |
1da177e4 LT |
49 | "VmRSS:\t%8lu kB\n" |
50 | "VmData:\t%8lu kB\n" | |
51 | "VmStk:\t%8lu kB\n" | |
52 | "VmExe:\t%8lu kB\n" | |
53 | "VmLib:\t%8lu kB\n" | |
b084d435 KH |
54 | "VmPTE:\t%8lu kB\n" |
55 | "VmSwap:\t%8lu kB\n", | |
365e9c87 | 56 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 57 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 58 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 59 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
60 | hiwater_rss << (PAGE_SHIFT-10), |
61 | total_rss << (PAGE_SHIFT-10), | |
1da177e4 LT |
62 | data << (PAGE_SHIFT-10), |
63 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, | |
b084d435 KH |
64 | (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10, |
65 | swap << (PAGE_SHIFT-10)); | |
1da177e4 LT |
66 | } |
67 | ||
68 | unsigned long task_vsize(struct mm_struct *mm) | |
69 | { | |
70 | return PAGE_SIZE * mm->total_vm; | |
71 | } | |
72 | ||
a2ade7b6 AD |
73 | unsigned long task_statm(struct mm_struct *mm, |
74 | unsigned long *shared, unsigned long *text, | |
75 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 76 | { |
d559db08 | 77 | *shared = get_mm_counter(mm, MM_FILEPAGES); |
1da177e4 LT |
78 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
79 | >> PAGE_SHIFT; | |
80 | *data = mm->total_vm - mm->shared_vm; | |
d559db08 | 81 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
82 | return mm->total_vm; |
83 | } | |
84 | ||
1da177e4 LT |
85 | static void pad_len_spaces(struct seq_file *m, int len) |
86 | { | |
87 | len = 25 + sizeof(void*) * 6 - len; | |
88 | if (len < 1) | |
89 | len = 1; | |
90 | seq_printf(m, "%*c", len, ' '); | |
91 | } | |
92 | ||
9e781440 KH |
93 | #ifdef CONFIG_NUMA |
94 | /* | |
95 | * These functions are for numa_maps but called in generic **maps seq_file | |
96 | * ->start(), ->stop() ops. | |
97 | * | |
98 | * numa_maps scans all vmas under mmap_sem and checks their mempolicy. | |
99 | * Each mempolicy object is controlled by reference counting. The problem here | |
100 | * is how to avoid accessing dead mempolicy object. | |
101 | * | |
102 | * Because we're holding mmap_sem while reading seq_file, it's safe to access | |
103 | * each vma's mempolicy, no vma objects will never drop refs to mempolicy. | |
104 | * | |
105 | * A task's mempolicy (task->mempolicy) has different behavior. task->mempolicy | |
106 | * is set and replaced under mmap_sem but unrefed and cleared under task_lock(). | |
107 | * So, without task_lock(), we cannot trust get_vma_policy() because we cannot | |
108 | * gurantee the task never exits under us. But taking task_lock() around | |
109 | * get_vma_plicy() causes lock order problem. | |
110 | * | |
111 | * To access task->mempolicy without lock, we hold a reference count of an | |
112 | * object pointed by task->mempolicy and remember it. This will guarantee | |
113 | * that task->mempolicy points to an alive object or NULL in numa_maps accesses. | |
114 | */ | |
115 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
116 | { | |
117 | struct task_struct *task = priv->task; | |
118 | ||
119 | task_lock(task); | |
120 | priv->task_mempolicy = task->mempolicy; | |
121 | mpol_get(priv->task_mempolicy); | |
122 | task_unlock(task); | |
123 | } | |
124 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
125 | { | |
126 | mpol_put(priv->task_mempolicy); | |
127 | } | |
128 | #else | |
129 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
130 | { | |
131 | } | |
132 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
133 | { | |
134 | } | |
135 | #endif | |
136 | ||
a6198797 MM |
137 | static void vma_stop(struct proc_maps_private *priv, struct vm_area_struct *vma) |
138 | { | |
139 | if (vma && vma != priv->tail_vma) { | |
140 | struct mm_struct *mm = vma->vm_mm; | |
9e781440 | 141 | release_task_mempolicy(priv); |
a6198797 MM |
142 | up_read(&mm->mmap_sem); |
143 | mmput(mm); | |
144 | } | |
145 | } | |
ec4dd3eb | 146 | |
a6198797 | 147 | static void *m_start(struct seq_file *m, loff_t *pos) |
e070ad49 | 148 | { |
a6198797 MM |
149 | struct proc_maps_private *priv = m->private; |
150 | unsigned long last_addr = m->version; | |
151 | struct mm_struct *mm; | |
152 | struct vm_area_struct *vma, *tail_vma = NULL; | |
153 | loff_t l = *pos; | |
154 | ||
155 | /* Clear the per syscall fields in priv */ | |
156 | priv->task = NULL; | |
157 | priv->tail_vma = NULL; | |
158 | ||
159 | /* | |
160 | * We remember last_addr rather than next_addr to hit with | |
161 | * mmap_cache most of the time. We have zero last_addr at | |
162 | * the beginning and also after lseek. We will have -1 last_addr | |
163 | * after the end of the vmas. | |
164 | */ | |
165 | ||
166 | if (last_addr == -1UL) | |
167 | return NULL; | |
168 | ||
169 | priv->task = get_pid_task(priv->pid, PIDTYPE_PID); | |
170 | if (!priv->task) | |
ec6fd8a4 | 171 | return ERR_PTR(-ESRCH); |
a6198797 | 172 | |
e7dcd999 | 173 | mm = mm_access(priv->task, PTRACE_MODE_READ); |
ec6fd8a4 AV |
174 | if (!mm || IS_ERR(mm)) |
175 | return mm; | |
00f89d21 | 176 | down_read(&mm->mmap_sem); |
a6198797 | 177 | |
31db58b3 | 178 | tail_vma = get_gate_vma(priv->task->mm); |
a6198797 | 179 | priv->tail_vma = tail_vma; |
9e781440 | 180 | hold_task_mempolicy(priv); |
a6198797 MM |
181 | /* Start with last addr hint */ |
182 | vma = find_vma(mm, last_addr); | |
183 | if (last_addr && vma) { | |
184 | vma = vma->vm_next; | |
185 | goto out; | |
186 | } | |
187 | ||
188 | /* | |
189 | * Check the vma index is within the range and do | |
190 | * sequential scan until m_index. | |
191 | */ | |
192 | vma = NULL; | |
193 | if ((unsigned long)l < mm->map_count) { | |
194 | vma = mm->mmap; | |
195 | while (l-- && vma) | |
196 | vma = vma->vm_next; | |
197 | goto out; | |
198 | } | |
199 | ||
200 | if (l != mm->map_count) | |
201 | tail_vma = NULL; /* After gate vma */ | |
202 | ||
203 | out: | |
204 | if (vma) | |
205 | return vma; | |
206 | ||
9e781440 | 207 | release_task_mempolicy(priv); |
a6198797 MM |
208 | /* End of vmas has been reached */ |
209 | m->version = (tail_vma != NULL)? 0: -1UL; | |
210 | up_read(&mm->mmap_sem); | |
211 | mmput(mm); | |
212 | return tail_vma; | |
213 | } | |
214 | ||
215 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
216 | { | |
217 | struct proc_maps_private *priv = m->private; | |
218 | struct vm_area_struct *vma = v; | |
219 | struct vm_area_struct *tail_vma = priv->tail_vma; | |
220 | ||
221 | (*pos)++; | |
222 | if (vma && (vma != tail_vma) && vma->vm_next) | |
223 | return vma->vm_next; | |
224 | vma_stop(priv, vma); | |
225 | return (vma != tail_vma)? tail_vma: NULL; | |
226 | } | |
227 | ||
228 | static void m_stop(struct seq_file *m, void *v) | |
229 | { | |
230 | struct proc_maps_private *priv = m->private; | |
231 | struct vm_area_struct *vma = v; | |
232 | ||
76597cd3 LT |
233 | if (!IS_ERR(vma)) |
234 | vma_stop(priv, vma); | |
a6198797 MM |
235 | if (priv->task) |
236 | put_task_struct(priv->task); | |
237 | } | |
238 | ||
239 | static int do_maps_open(struct inode *inode, struct file *file, | |
03a44825 | 240 | const struct seq_operations *ops) |
a6198797 MM |
241 | { |
242 | struct proc_maps_private *priv; | |
243 | int ret = -ENOMEM; | |
244 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
245 | if (priv) { | |
246 | priv->pid = proc_pid(inode); | |
247 | ret = seq_open(file, ops); | |
248 | if (!ret) { | |
249 | struct seq_file *m = file->private_data; | |
250 | m->private = priv; | |
251 | } else { | |
252 | kfree(priv); | |
253 | } | |
254 | } | |
255 | return ret; | |
256 | } | |
e070ad49 | 257 | |
b7643757 SP |
258 | static void |
259 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 260 | { |
e070ad49 ML |
261 | struct mm_struct *mm = vma->vm_mm; |
262 | struct file *file = vma->vm_file; | |
b7643757 SP |
263 | struct proc_maps_private *priv = m->private; |
264 | struct task_struct *task = priv->task; | |
ca16d140 | 265 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 266 | unsigned long ino = 0; |
6260a4b0 | 267 | unsigned long long pgoff = 0; |
a09a79f6 | 268 | unsigned long start, end; |
1da177e4 LT |
269 | dev_t dev = 0; |
270 | int len; | |
b7643757 | 271 | const char *name = NULL; |
1da177e4 LT |
272 | |
273 | if (file) { | |
2fddfeef | 274 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
1da177e4 LT |
275 | dev = inode->i_sb->s_dev; |
276 | ino = inode->i_ino; | |
6260a4b0 | 277 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
278 | } |
279 | ||
d7824370 LT |
280 | /* We don't show the stack guard page in /proc/maps */ |
281 | start = vma->vm_start; | |
a09a79f6 MP |
282 | if (stack_guard_page_start(vma, start)) |
283 | start += PAGE_SIZE; | |
284 | end = vma->vm_end; | |
285 | if (stack_guard_page_end(vma, end)) | |
286 | end -= PAGE_SIZE; | |
d7824370 | 287 | |
1804dc6e | 288 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n", |
d7824370 | 289 | start, |
a09a79f6 | 290 | end, |
1da177e4 LT |
291 | flags & VM_READ ? 'r' : '-', |
292 | flags & VM_WRITE ? 'w' : '-', | |
293 | flags & VM_EXEC ? 'x' : '-', | |
294 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 295 | pgoff, |
1da177e4 LT |
296 | MAJOR(dev), MINOR(dev), ino, &len); |
297 | ||
298 | /* | |
299 | * Print the dentry name for named mappings, and a | |
300 | * special [heap] marker for the heap: | |
301 | */ | |
e070ad49 | 302 | if (file) { |
1da177e4 | 303 | pad_len_spaces(m, len); |
c32c2f63 | 304 | seq_path(m, &file->f_path, "\n"); |
b7643757 SP |
305 | goto done; |
306 | } | |
307 | ||
308 | name = arch_vma_name(vma); | |
309 | if (!name) { | |
310 | pid_t tid; | |
311 | ||
312 | if (!mm) { | |
313 | name = "[vdso]"; | |
314 | goto done; | |
315 | } | |
316 | ||
317 | if (vma->vm_start <= mm->brk && | |
318 | vma->vm_end >= mm->start_brk) { | |
319 | name = "[heap]"; | |
320 | goto done; | |
321 | } | |
322 | ||
323 | tid = vm_is_stack(task, vma, is_pid); | |
324 | ||
325 | if (tid != 0) { | |
326 | /* | |
327 | * Thread stack in /proc/PID/task/TID/maps or | |
328 | * the main process stack. | |
329 | */ | |
330 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
331 | vma->vm_end >= mm->start_stack)) { | |
332 | name = "[stack]"; | |
e6e5494c | 333 | } else { |
b7643757 SP |
334 | /* Thread stack in /proc/PID/maps */ |
335 | pad_len_spaces(m, len); | |
336 | seq_printf(m, "[stack:%d]", tid); | |
1da177e4 | 337 | } |
e6e5494c | 338 | } |
b7643757 SP |
339 | } |
340 | ||
341 | done: | |
342 | if (name) { | |
343 | pad_len_spaces(m, len); | |
344 | seq_puts(m, name); | |
1da177e4 LT |
345 | } |
346 | seq_putc(m, '\n'); | |
7c88db0c JK |
347 | } |
348 | ||
b7643757 | 349 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c JK |
350 | { |
351 | struct vm_area_struct *vma = v; | |
352 | struct proc_maps_private *priv = m->private; | |
353 | struct task_struct *task = priv->task; | |
354 | ||
b7643757 | 355 | show_map_vma(m, vma, is_pid); |
e070ad49 | 356 | |
e070ad49 | 357 | if (m->count < m->size) /* vma is copied successfully */ |
31db58b3 SW |
358 | m->version = (vma != get_gate_vma(task->mm)) |
359 | ? vma->vm_start : 0; | |
1da177e4 LT |
360 | return 0; |
361 | } | |
362 | ||
b7643757 SP |
363 | static int show_pid_map(struct seq_file *m, void *v) |
364 | { | |
365 | return show_map(m, v, 1); | |
366 | } | |
367 | ||
368 | static int show_tid_map(struct seq_file *m, void *v) | |
369 | { | |
370 | return show_map(m, v, 0); | |
371 | } | |
372 | ||
03a44825 | 373 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
374 | .start = m_start, |
375 | .next = m_next, | |
376 | .stop = m_stop, | |
b7643757 SP |
377 | .show = show_pid_map |
378 | }; | |
379 | ||
380 | static const struct seq_operations proc_tid_maps_op = { | |
381 | .start = m_start, | |
382 | .next = m_next, | |
383 | .stop = m_stop, | |
384 | .show = show_tid_map | |
a6198797 MM |
385 | }; |
386 | ||
b7643757 | 387 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
388 | { |
389 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
390 | } | |
391 | ||
b7643757 SP |
392 | static int tid_maps_open(struct inode *inode, struct file *file) |
393 | { | |
394 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
395 | } | |
396 | ||
397 | const struct file_operations proc_pid_maps_operations = { | |
398 | .open = pid_maps_open, | |
399 | .read = seq_read, | |
400 | .llseek = seq_lseek, | |
401 | .release = seq_release_private, | |
402 | }; | |
403 | ||
404 | const struct file_operations proc_tid_maps_operations = { | |
405 | .open = tid_maps_open, | |
a6198797 MM |
406 | .read = seq_read, |
407 | .llseek = seq_lseek, | |
408 | .release = seq_release_private, | |
409 | }; | |
410 | ||
411 | /* | |
412 | * Proportional Set Size(PSS): my share of RSS. | |
413 | * | |
414 | * PSS of a process is the count of pages it has in memory, where each | |
415 | * page is divided by the number of processes sharing it. So if a | |
416 | * process has 1000 pages all to itself, and 1000 shared with one other | |
417 | * process, its PSS will be 1500. | |
418 | * | |
419 | * To keep (accumulated) division errors low, we adopt a 64bit | |
420 | * fixed-point pss counter to minimize division errors. So (pss >> | |
421 | * PSS_SHIFT) would be the real byte count. | |
422 | * | |
423 | * A shift of 12 before division means (assuming 4K page size): | |
424 | * - 1M 3-user-pages add up to 8KB errors; | |
425 | * - supports mapcount up to 2^24, or 16M; | |
426 | * - supports PSS up to 2^52 bytes, or 4PB. | |
427 | */ | |
428 | #define PSS_SHIFT 12 | |
429 | ||
1e883281 | 430 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 431 | struct mem_size_stats { |
a6198797 MM |
432 | struct vm_area_struct *vma; |
433 | unsigned long resident; | |
434 | unsigned long shared_clean; | |
435 | unsigned long shared_dirty; | |
436 | unsigned long private_clean; | |
437 | unsigned long private_dirty; | |
438 | unsigned long referenced; | |
b40d4f84 | 439 | unsigned long anonymous; |
4031a219 | 440 | unsigned long anonymous_thp; |
214e471f | 441 | unsigned long swap; |
bca15543 | 442 | unsigned long nonlinear; |
a6198797 MM |
443 | u64 pss; |
444 | }; | |
445 | ||
ae11c4d9 DH |
446 | |
447 | static void smaps_pte_entry(pte_t ptent, unsigned long addr, | |
3c9acc78 | 448 | unsigned long ptent_size, struct mm_walk *walk) |
ae11c4d9 DH |
449 | { |
450 | struct mem_size_stats *mss = walk->private; | |
451 | struct vm_area_struct *vma = mss->vma; | |
bca15543 | 452 | pgoff_t pgoff = linear_page_index(vma, addr); |
b1d4d9e0 | 453 | struct page *page = NULL; |
ae11c4d9 DH |
454 | int mapcount; |
455 | ||
b1d4d9e0 KK |
456 | if (pte_present(ptent)) { |
457 | page = vm_normal_page(vma, addr, ptent); | |
458 | } else if (is_swap_pte(ptent)) { | |
459 | swp_entry_t swpent = pte_to_swp_entry(ptent); | |
ae11c4d9 | 460 | |
b1d4d9e0 KK |
461 | if (!non_swap_entry(swpent)) |
462 | mss->swap += ptent_size; | |
463 | else if (is_migration_entry(swpent)) | |
464 | page = migration_entry_to_page(swpent); | |
bca15543 KK |
465 | } else if (pte_file(ptent)) { |
466 | if (pte_to_pgoff(ptent) != pgoff) | |
467 | mss->nonlinear += ptent_size; | |
b1d4d9e0 | 468 | } |
ae11c4d9 | 469 | |
ae11c4d9 DH |
470 | if (!page) |
471 | return; | |
472 | ||
473 | if (PageAnon(page)) | |
3c9acc78 | 474 | mss->anonymous += ptent_size; |
ae11c4d9 | 475 | |
bca15543 KK |
476 | if (page->index != pgoff) |
477 | mss->nonlinear += ptent_size; | |
478 | ||
3c9acc78 | 479 | mss->resident += ptent_size; |
ae11c4d9 DH |
480 | /* Accumulate the size in pages that have been accessed. */ |
481 | if (pte_young(ptent) || PageReferenced(page)) | |
3c9acc78 | 482 | mss->referenced += ptent_size; |
ae11c4d9 DH |
483 | mapcount = page_mapcount(page); |
484 | if (mapcount >= 2) { | |
485 | if (pte_dirty(ptent) || PageDirty(page)) | |
3c9acc78 | 486 | mss->shared_dirty += ptent_size; |
ae11c4d9 | 487 | else |
3c9acc78 DH |
488 | mss->shared_clean += ptent_size; |
489 | mss->pss += (ptent_size << PSS_SHIFT) / mapcount; | |
ae11c4d9 DH |
490 | } else { |
491 | if (pte_dirty(ptent) || PageDirty(page)) | |
3c9acc78 | 492 | mss->private_dirty += ptent_size; |
ae11c4d9 | 493 | else |
3c9acc78 DH |
494 | mss->private_clean += ptent_size; |
495 | mss->pss += (ptent_size << PSS_SHIFT); | |
ae11c4d9 DH |
496 | } |
497 | } | |
498 | ||
b3ae5acb | 499 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 500 | struct mm_walk *walk) |
e070ad49 | 501 | { |
2165009b | 502 | struct mem_size_stats *mss = walk->private; |
b3ae5acb | 503 | struct vm_area_struct *vma = mss->vma; |
ae11c4d9 | 504 | pte_t *pte; |
705e87c0 | 505 | spinlock_t *ptl; |
e070ad49 | 506 | |
025c5b24 NH |
507 | if (pmd_trans_huge_lock(pmd, vma) == 1) { |
508 | smaps_pte_entry(*(pte_t *)pmd, addr, HPAGE_PMD_SIZE, walk); | |
22e057c5 | 509 | spin_unlock(&walk->mm->page_table_lock); |
025c5b24 NH |
510 | mss->anonymous_thp += HPAGE_PMD_SIZE; |
511 | return 0; | |
22e057c5 | 512 | } |
1a5a9906 AA |
513 | |
514 | if (pmd_trans_unstable(pmd)) | |
515 | return 0; | |
22e057c5 DH |
516 | /* |
517 | * The mmap_sem held all the way back in m_start() is what | |
518 | * keeps khugepaged out of here and from collapsing things | |
519 | * in here. | |
520 | */ | |
705e87c0 | 521 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 522 | for (; addr != end; pte++, addr += PAGE_SIZE) |
3c9acc78 | 523 | smaps_pte_entry(*pte, addr, PAGE_SIZE, walk); |
705e87c0 HD |
524 | pte_unmap_unlock(pte - 1, ptl); |
525 | cond_resched(); | |
b3ae5acb | 526 | return 0; |
e070ad49 ML |
527 | } |
528 | ||
b7643757 | 529 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 | 530 | { |
7c88db0c JK |
531 | struct proc_maps_private *priv = m->private; |
532 | struct task_struct *task = priv->task; | |
e070ad49 | 533 | struct vm_area_struct *vma = v; |
e070ad49 | 534 | struct mem_size_stats mss; |
2165009b DH |
535 | struct mm_walk smaps_walk = { |
536 | .pmd_entry = smaps_pte_range, | |
537 | .mm = vma->vm_mm, | |
538 | .private = &mss, | |
539 | }; | |
e070ad49 ML |
540 | |
541 | memset(&mss, 0, sizeof mss); | |
b3ae5acb | 542 | mss.vma = vma; |
d82ef020 | 543 | /* mmap_sem is held in m_start */ |
5ddfae16 | 544 | if (vma->vm_mm && !is_vm_hugetlb_page(vma)) |
2165009b | 545 | walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); |
4752c369 | 546 | |
b7643757 | 547 | show_map_vma(m, vma, is_pid); |
4752c369 MM |
548 | |
549 | seq_printf(m, | |
550 | "Size: %8lu kB\n" | |
551 | "Rss: %8lu kB\n" | |
552 | "Pss: %8lu kB\n" | |
553 | "Shared_Clean: %8lu kB\n" | |
554 | "Shared_Dirty: %8lu kB\n" | |
555 | "Private_Clean: %8lu kB\n" | |
556 | "Private_Dirty: %8lu kB\n" | |
214e471f | 557 | "Referenced: %8lu kB\n" |
b40d4f84 | 558 | "Anonymous: %8lu kB\n" |
4031a219 | 559 | "AnonHugePages: %8lu kB\n" |
08fba699 | 560 | "Swap: %8lu kB\n" |
3340289d | 561 | "KernelPageSize: %8lu kB\n" |
2d90508f NK |
562 | "MMUPageSize: %8lu kB\n" |
563 | "Locked: %8lu kB\n", | |
4752c369 MM |
564 | (vma->vm_end - vma->vm_start) >> 10, |
565 | mss.resident >> 10, | |
566 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
567 | mss.shared_clean >> 10, | |
568 | mss.shared_dirty >> 10, | |
569 | mss.private_clean >> 10, | |
570 | mss.private_dirty >> 10, | |
214e471f | 571 | mss.referenced >> 10, |
b40d4f84 | 572 | mss.anonymous >> 10, |
4031a219 | 573 | mss.anonymous_thp >> 10, |
08fba699 | 574 | mss.swap >> 10, |
3340289d | 575 | vma_kernel_pagesize(vma) >> 10, |
2d90508f NK |
576 | vma_mmu_pagesize(vma) >> 10, |
577 | (vma->vm_flags & VM_LOCKED) ? | |
578 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); | |
4752c369 | 579 | |
bca15543 KK |
580 | if (vma->vm_flags & VM_NONLINEAR) |
581 | seq_printf(m, "Nonlinear: %8lu kB\n", | |
582 | mss.nonlinear >> 10); | |
583 | ||
7c88db0c | 584 | if (m->count < m->size) /* vma is copied successfully */ |
31db58b3 SW |
585 | m->version = (vma != get_gate_vma(task->mm)) |
586 | ? vma->vm_start : 0; | |
7c88db0c | 587 | return 0; |
e070ad49 ML |
588 | } |
589 | ||
b7643757 SP |
590 | static int show_pid_smap(struct seq_file *m, void *v) |
591 | { | |
592 | return show_smap(m, v, 1); | |
593 | } | |
594 | ||
595 | static int show_tid_smap(struct seq_file *m, void *v) | |
596 | { | |
597 | return show_smap(m, v, 0); | |
598 | } | |
599 | ||
03a44825 | 600 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
601 | .start = m_start, |
602 | .next = m_next, | |
603 | .stop = m_stop, | |
b7643757 SP |
604 | .show = show_pid_smap |
605 | }; | |
606 | ||
607 | static const struct seq_operations proc_tid_smaps_op = { | |
608 | .start = m_start, | |
609 | .next = m_next, | |
610 | .stop = m_stop, | |
611 | .show = show_tid_smap | |
a6198797 MM |
612 | }; |
613 | ||
b7643757 | 614 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
615 | { |
616 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
617 | } | |
618 | ||
b7643757 SP |
619 | static int tid_smaps_open(struct inode *inode, struct file *file) |
620 | { | |
621 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
622 | } | |
623 | ||
624 | const struct file_operations proc_pid_smaps_operations = { | |
625 | .open = pid_smaps_open, | |
626 | .read = seq_read, | |
627 | .llseek = seq_lseek, | |
628 | .release = seq_release_private, | |
629 | }; | |
630 | ||
631 | const struct file_operations proc_tid_smaps_operations = { | |
632 | .open = tid_smaps_open, | |
a6198797 MM |
633 | .read = seq_read, |
634 | .llseek = seq_lseek, | |
635 | .release = seq_release_private, | |
636 | }; | |
637 | ||
638 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, | |
2165009b | 639 | unsigned long end, struct mm_walk *walk) |
a6198797 | 640 | { |
2165009b | 641 | struct vm_area_struct *vma = walk->private; |
a6198797 MM |
642 | pte_t *pte, ptent; |
643 | spinlock_t *ptl; | |
644 | struct page *page; | |
645 | ||
e180377f | 646 | split_huge_page_pmd(vma, addr, pmd); |
1a5a9906 AA |
647 | if (pmd_trans_unstable(pmd)) |
648 | return 0; | |
03319327 | 649 | |
a6198797 MM |
650 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
651 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
652 | ptent = *pte; | |
653 | if (!pte_present(ptent)) | |
654 | continue; | |
655 | ||
656 | page = vm_normal_page(vma, addr, ptent); | |
657 | if (!page) | |
658 | continue; | |
659 | ||
660 | /* Clear accessed and referenced bits. */ | |
661 | ptep_test_and_clear_young(vma, addr, pte); | |
662 | ClearPageReferenced(page); | |
663 | } | |
664 | pte_unmap_unlock(pte - 1, ptl); | |
665 | cond_resched(); | |
666 | return 0; | |
667 | } | |
668 | ||
398499d5 MB |
669 | #define CLEAR_REFS_ALL 1 |
670 | #define CLEAR_REFS_ANON 2 | |
671 | #define CLEAR_REFS_MAPPED 3 | |
672 | ||
f248dcb3 MM |
673 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
674 | size_t count, loff_t *ppos) | |
b813e931 | 675 | { |
f248dcb3 | 676 | struct task_struct *task; |
fb92a4b0 | 677 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 678 | struct mm_struct *mm; |
b813e931 | 679 | struct vm_area_struct *vma; |
0a8cb8e3 AD |
680 | int type; |
681 | int rv; | |
b813e931 | 682 | |
f248dcb3 MM |
683 | memset(buffer, 0, sizeof(buffer)); |
684 | if (count > sizeof(buffer) - 1) | |
685 | count = sizeof(buffer) - 1; | |
686 | if (copy_from_user(buffer, buf, count)) | |
687 | return -EFAULT; | |
0a8cb8e3 AD |
688 | rv = kstrtoint(strstrip(buffer), 10, &type); |
689 | if (rv < 0) | |
690 | return rv; | |
398499d5 | 691 | if (type < CLEAR_REFS_ALL || type > CLEAR_REFS_MAPPED) |
f248dcb3 | 692 | return -EINVAL; |
f248dcb3 MM |
693 | task = get_proc_task(file->f_path.dentry->d_inode); |
694 | if (!task) | |
695 | return -ESRCH; | |
696 | mm = get_task_mm(task); | |
697 | if (mm) { | |
20cbc972 AM |
698 | struct mm_walk clear_refs_walk = { |
699 | .pmd_entry = clear_refs_pte_range, | |
700 | .mm = mm, | |
701 | }; | |
f248dcb3 | 702 | down_read(&mm->mmap_sem); |
2165009b DH |
703 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
704 | clear_refs_walk.private = vma; | |
398499d5 MB |
705 | if (is_vm_hugetlb_page(vma)) |
706 | continue; | |
707 | /* | |
708 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
709 | * | |
710 | * Writing 2 to /proc/pid/clear_refs only affects | |
711 | * Anonymous pages. | |
712 | * | |
713 | * Writing 3 to /proc/pid/clear_refs only affects file | |
714 | * mapped pages. | |
715 | */ | |
716 | if (type == CLEAR_REFS_ANON && vma->vm_file) | |
717 | continue; | |
718 | if (type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
719 | continue; | |
720 | walk_page_range(vma->vm_start, vma->vm_end, | |
721 | &clear_refs_walk); | |
2165009b | 722 | } |
f248dcb3 MM |
723 | flush_tlb_mm(mm); |
724 | up_read(&mm->mmap_sem); | |
725 | mmput(mm); | |
726 | } | |
727 | put_task_struct(task); | |
fb92a4b0 VL |
728 | |
729 | return count; | |
b813e931 DR |
730 | } |
731 | ||
f248dcb3 MM |
732 | const struct file_operations proc_clear_refs_operations = { |
733 | .write = clear_refs_write, | |
6038f373 | 734 | .llseek = noop_llseek, |
f248dcb3 MM |
735 | }; |
736 | ||
092b50ba NH |
737 | typedef struct { |
738 | u64 pme; | |
739 | } pagemap_entry_t; | |
740 | ||
85863e47 | 741 | struct pagemapread { |
d82ef020 | 742 | int pos, len; |
092b50ba | 743 | pagemap_entry_t *buffer; |
85863e47 MM |
744 | }; |
745 | ||
5aaabe83 NH |
746 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
747 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
748 | ||
f16278c6 HR |
749 | #define PM_ENTRY_BYTES sizeof(u64) |
750 | #define PM_STATUS_BITS 3 | |
751 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) | |
752 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) | |
753 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) | |
754 | #define PM_PSHIFT_BITS 6 | |
755 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) | |
756 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) | |
757 | #define PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) | |
758 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) | |
759 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) | |
760 | ||
761 | #define PM_PRESENT PM_STATUS(4LL) | |
762 | #define PM_SWAP PM_STATUS(2LL) | |
052fb0d6 | 763 | #define PM_FILE PM_STATUS(1LL) |
f16278c6 | 764 | #define PM_NOT_PRESENT PM_PSHIFT(PAGE_SHIFT) |
85863e47 MM |
765 | #define PM_END_OF_BUFFER 1 |
766 | ||
092b50ba NH |
767 | static inline pagemap_entry_t make_pme(u64 val) |
768 | { | |
769 | return (pagemap_entry_t) { .pme = val }; | |
770 | } | |
771 | ||
772 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
773 | struct pagemapread *pm) |
774 | { | |
092b50ba | 775 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 776 | if (pm->pos >= pm->len) |
aae8679b | 777 | return PM_END_OF_BUFFER; |
85863e47 MM |
778 | return 0; |
779 | } | |
780 | ||
781 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 782 | struct mm_walk *walk) |
85863e47 | 783 | { |
2165009b | 784 | struct pagemapread *pm = walk->private; |
85863e47 MM |
785 | unsigned long addr; |
786 | int err = 0; | |
092b50ba NH |
787 | pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); |
788 | ||
85863e47 | 789 | for (addr = start; addr < end; addr += PAGE_SIZE) { |
092b50ba | 790 | err = add_to_pagemap(addr, &pme, pm); |
85863e47 MM |
791 | if (err) |
792 | break; | |
793 | } | |
794 | return err; | |
795 | } | |
796 | ||
052fb0d6 KK |
797 | static void pte_to_pagemap_entry(pagemap_entry_t *pme, |
798 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) | |
85863e47 | 799 | { |
052fb0d6 KK |
800 | u64 frame, flags; |
801 | struct page *page = NULL; | |
85863e47 | 802 | |
052fb0d6 KK |
803 | if (pte_present(pte)) { |
804 | frame = pte_pfn(pte); | |
805 | flags = PM_PRESENT; | |
806 | page = vm_normal_page(vma, addr, pte); | |
807 | } else if (is_swap_pte(pte)) { | |
808 | swp_entry_t entry = pte_to_swp_entry(pte); | |
809 | ||
810 | frame = swp_type(entry) | | |
811 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
812 | flags = PM_SWAP; | |
813 | if (is_migration_entry(entry)) | |
814 | page = migration_entry_to_page(entry); | |
815 | } else { | |
16fbdce6 | 816 | *pme = make_pme(PM_NOT_PRESENT); |
052fb0d6 KK |
817 | return; |
818 | } | |
819 | ||
820 | if (page && !PageAnon(page)) | |
821 | flags |= PM_FILE; | |
822 | ||
823 | *pme = make_pme(PM_PFRAME(frame) | PM_PSHIFT(PAGE_SHIFT) | flags); | |
bcf8039e DH |
824 | } |
825 | ||
5aaabe83 | 826 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
092b50ba NH |
827 | static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, |
828 | pmd_t pmd, int offset) | |
5aaabe83 | 829 | { |
5aaabe83 NH |
830 | /* |
831 | * Currently pmd for thp is always present because thp can not be | |
832 | * swapped-out, migrated, or HWPOISONed (split in such cases instead.) | |
833 | * This if-check is just to prepare for future implementation. | |
834 | */ | |
835 | if (pmd_present(pmd)) | |
092b50ba NH |
836 | *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset) |
837 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); | |
16fbdce6 KK |
838 | else |
839 | *pme = make_pme(PM_NOT_PRESENT); | |
5aaabe83 NH |
840 | } |
841 | #else | |
092b50ba NH |
842 | static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, |
843 | pmd_t pmd, int offset) | |
5aaabe83 | 844 | { |
5aaabe83 NH |
845 | } |
846 | #endif | |
847 | ||
85863e47 | 848 | static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 849 | struct mm_walk *walk) |
85863e47 | 850 | { |
bcf8039e | 851 | struct vm_area_struct *vma; |
2165009b | 852 | struct pagemapread *pm = walk->private; |
85863e47 MM |
853 | pte_t *pte; |
854 | int err = 0; | |
092b50ba | 855 | pagemap_entry_t pme = make_pme(PM_NOT_PRESENT); |
85863e47 | 856 | |
bcf8039e DH |
857 | /* find the first VMA at or above 'addr' */ |
858 | vma = find_vma(walk->mm, addr); | |
08fa29d9 | 859 | if (vma && pmd_trans_huge_lock(pmd, vma) == 1) { |
025c5b24 NH |
860 | for (; addr != end; addr += PAGE_SIZE) { |
861 | unsigned long offset; | |
862 | ||
863 | offset = (addr & ~PAGEMAP_WALK_MASK) >> | |
864 | PAGE_SHIFT; | |
092b50ba NH |
865 | thp_pmd_to_pagemap_entry(&pme, *pmd, offset); |
866 | err = add_to_pagemap(addr, &pme, pm); | |
025c5b24 NH |
867 | if (err) |
868 | break; | |
5aaabe83 | 869 | } |
5aaabe83 | 870 | spin_unlock(&walk->mm->page_table_lock); |
025c5b24 | 871 | return err; |
5aaabe83 NH |
872 | } |
873 | ||
45f83cef AA |
874 | if (pmd_trans_unstable(pmd)) |
875 | return 0; | |
85863e47 | 876 | for (; addr != end; addr += PAGE_SIZE) { |
bcf8039e DH |
877 | |
878 | /* check to see if we've left 'vma' behind | |
879 | * and need a new, higher one */ | |
16fbdce6 | 880 | if (vma && (addr >= vma->vm_end)) { |
bcf8039e | 881 | vma = find_vma(walk->mm, addr); |
16fbdce6 KK |
882 | pme = make_pme(PM_NOT_PRESENT); |
883 | } | |
bcf8039e DH |
884 | |
885 | /* check that 'vma' actually covers this address, | |
886 | * and that it isn't a huge page vma */ | |
887 | if (vma && (vma->vm_start <= addr) && | |
888 | !is_vm_hugetlb_page(vma)) { | |
889 | pte = pte_offset_map(pmd, addr); | |
052fb0d6 | 890 | pte_to_pagemap_entry(&pme, vma, addr, *pte); |
bcf8039e DH |
891 | /* unmap before userspace copy */ |
892 | pte_unmap(pte); | |
893 | } | |
092b50ba | 894 | err = add_to_pagemap(addr, &pme, pm); |
85863e47 MM |
895 | if (err) |
896 | return err; | |
897 | } | |
898 | ||
899 | cond_resched(); | |
900 | ||
901 | return err; | |
902 | } | |
903 | ||
1a5cb814 | 904 | #ifdef CONFIG_HUGETLB_PAGE |
092b50ba NH |
905 | static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, |
906 | pte_t pte, int offset) | |
5dc37642 | 907 | { |
5dc37642 | 908 | if (pte_present(pte)) |
092b50ba NH |
909 | *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset) |
910 | | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT); | |
16fbdce6 KK |
911 | else |
912 | *pme = make_pme(PM_NOT_PRESENT); | |
5dc37642 NH |
913 | } |
914 | ||
116354d1 NH |
915 | /* This function walks within one hugetlb entry in the single call */ |
916 | static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, | |
917 | unsigned long addr, unsigned long end, | |
918 | struct mm_walk *walk) | |
5dc37642 | 919 | { |
5dc37642 | 920 | struct pagemapread *pm = walk->private; |
5dc37642 | 921 | int err = 0; |
16fbdce6 | 922 | pagemap_entry_t pme; |
5dc37642 | 923 | |
5dc37642 | 924 | for (; addr != end; addr += PAGE_SIZE) { |
116354d1 | 925 | int offset = (addr & ~hmask) >> PAGE_SHIFT; |
092b50ba NH |
926 | huge_pte_to_pagemap_entry(&pme, *pte, offset); |
927 | err = add_to_pagemap(addr, &pme, pm); | |
5dc37642 NH |
928 | if (err) |
929 | return err; | |
930 | } | |
931 | ||
932 | cond_resched(); | |
933 | ||
934 | return err; | |
935 | } | |
1a5cb814 | 936 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 937 | |
85863e47 MM |
938 | /* |
939 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
940 | * | |
f16278c6 HR |
941 | * For each page in the address space, this file contains one 64-bit entry |
942 | * consisting of the following: | |
943 | * | |
052fb0d6 | 944 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 945 | * Bits 0-4 swap type if swapped |
052fb0d6 | 946 | * Bits 5-54 swap offset if swapped |
f16278c6 | 947 | * Bits 55-60 page shift (page size = 1<<page shift) |
052fb0d6 | 948 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
949 | * Bit 62 page swapped |
950 | * Bit 63 page present | |
951 | * | |
952 | * If the page is not present but in swap, then the PFN contains an | |
953 | * encoding of the swap file number and the page's offset into the | |
954 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
955 | * precisely which pages are mapped (or in swap) and comparing mapped |
956 | * pages between processes. | |
957 | * | |
958 | * Efficient users of this interface will use /proc/pid/maps to | |
959 | * determine which areas of memory are actually mapped and llseek to | |
960 | * skip over unmapped regions. | |
961 | */ | |
962 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
963 | size_t count, loff_t *ppos) | |
964 | { | |
965 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
85863e47 MM |
966 | struct mm_struct *mm; |
967 | struct pagemapread pm; | |
85863e47 | 968 | int ret = -ESRCH; |
ee1e6ab6 | 969 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
970 | unsigned long src; |
971 | unsigned long svpfn; | |
972 | unsigned long start_vaddr; | |
973 | unsigned long end_vaddr; | |
d82ef020 | 974 | int copied = 0; |
85863e47 MM |
975 | |
976 | if (!task) | |
977 | goto out; | |
978 | ||
85863e47 MM |
979 | ret = -EINVAL; |
980 | /* file position must be aligned */ | |
aae8679b | 981 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
fb39380b | 982 | goto out_task; |
85863e47 MM |
983 | |
984 | ret = 0; | |
08161786 VM |
985 | if (!count) |
986 | goto out_task; | |
987 | ||
d82ef020 KH |
988 | pm.len = PM_ENTRY_BYTES * (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
989 | pm.buffer = kmalloc(pm.len, GFP_TEMPORARY); | |
5d7e0d2b | 990 | ret = -ENOMEM; |
d82ef020 | 991 | if (!pm.buffer) |
98bc93e5 KM |
992 | goto out_task; |
993 | ||
e7dcd999 | 994 | mm = mm_access(task, PTRACE_MODE_READ); |
98bc93e5 KM |
995 | ret = PTR_ERR(mm); |
996 | if (!mm || IS_ERR(mm)) | |
997 | goto out_free; | |
85863e47 | 998 | |
5d7e0d2b AM |
999 | pagemap_walk.pmd_entry = pagemap_pte_range; |
1000 | pagemap_walk.pte_hole = pagemap_pte_hole; | |
1a5cb814 | 1001 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1002 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1003 | #endif |
5d7e0d2b AM |
1004 | pagemap_walk.mm = mm; |
1005 | pagemap_walk.private = ± | |
1006 | ||
1007 | src = *ppos; | |
1008 | svpfn = src / PM_ENTRY_BYTES; | |
1009 | start_vaddr = svpfn << PAGE_SHIFT; | |
1010 | end_vaddr = TASK_SIZE_OF(task); | |
1011 | ||
1012 | /* watch out for wraparound */ | |
1013 | if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT) | |
1014 | start_vaddr = end_vaddr; | |
1015 | ||
1016 | /* | |
1017 | * The odds are that this will stop walking way | |
1018 | * before end_vaddr, because the length of the | |
1019 | * user buffer is tracked in "pm", and the walk | |
1020 | * will stop when we hit the end of the buffer. | |
1021 | */ | |
d82ef020 KH |
1022 | ret = 0; |
1023 | while (count && (start_vaddr < end_vaddr)) { | |
1024 | int len; | |
1025 | unsigned long end; | |
1026 | ||
1027 | pm.pos = 0; | |
ea251c1d | 1028 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1029 | /* overflow ? */ |
1030 | if (end < start_vaddr || end > end_vaddr) | |
1031 | end = end_vaddr; | |
1032 | down_read(&mm->mmap_sem); | |
1033 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1034 | up_read(&mm->mmap_sem); | |
1035 | start_vaddr = end; | |
1036 | ||
1037 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1038 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1039 | ret = -EFAULT; |
98bc93e5 | 1040 | goto out_mm; |
d82ef020 KH |
1041 | } |
1042 | copied += len; | |
1043 | buf += len; | |
1044 | count -= len; | |
85863e47 | 1045 | } |
d82ef020 KH |
1046 | *ppos += copied; |
1047 | if (!ret || ret == PM_END_OF_BUFFER) | |
1048 | ret = copied; | |
1049 | ||
fb39380b MT |
1050 | out_mm: |
1051 | mmput(mm); | |
98bc93e5 KM |
1052 | out_free: |
1053 | kfree(pm.buffer); | |
85863e47 MM |
1054 | out_task: |
1055 | put_task_struct(task); | |
1056 | out: | |
1057 | return ret; | |
1058 | } | |
1059 | ||
1060 | const struct file_operations proc_pagemap_operations = { | |
1061 | .llseek = mem_lseek, /* borrow this */ | |
1062 | .read = pagemap_read, | |
1063 | }; | |
1e883281 | 1064 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1065 | |
6e21c8f1 | 1066 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1067 | |
f69ff943 SW |
1068 | struct numa_maps { |
1069 | struct vm_area_struct *vma; | |
1070 | unsigned long pages; | |
1071 | unsigned long anon; | |
1072 | unsigned long active; | |
1073 | unsigned long writeback; | |
1074 | unsigned long mapcount_max; | |
1075 | unsigned long dirty; | |
1076 | unsigned long swapcache; | |
1077 | unsigned long node[MAX_NUMNODES]; | |
1078 | }; | |
1079 | ||
5b52fc89 SW |
1080 | struct numa_maps_private { |
1081 | struct proc_maps_private proc_maps; | |
1082 | struct numa_maps md; | |
1083 | }; | |
1084 | ||
eb4866d0 DH |
1085 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1086 | unsigned long nr_pages) | |
f69ff943 SW |
1087 | { |
1088 | int count = page_mapcount(page); | |
1089 | ||
eb4866d0 | 1090 | md->pages += nr_pages; |
f69ff943 | 1091 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1092 | md->dirty += nr_pages; |
f69ff943 SW |
1093 | |
1094 | if (PageSwapCache(page)) | |
eb4866d0 | 1095 | md->swapcache += nr_pages; |
f69ff943 SW |
1096 | |
1097 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1098 | md->active += nr_pages; |
f69ff943 SW |
1099 | |
1100 | if (PageWriteback(page)) | |
eb4866d0 | 1101 | md->writeback += nr_pages; |
f69ff943 SW |
1102 | |
1103 | if (PageAnon(page)) | |
eb4866d0 | 1104 | md->anon += nr_pages; |
f69ff943 SW |
1105 | |
1106 | if (count > md->mapcount_max) | |
1107 | md->mapcount_max = count; | |
1108 | ||
eb4866d0 | 1109 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1110 | } |
1111 | ||
3200a8aa DH |
1112 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1113 | unsigned long addr) | |
1114 | { | |
1115 | struct page *page; | |
1116 | int nid; | |
1117 | ||
1118 | if (!pte_present(pte)) | |
1119 | return NULL; | |
1120 | ||
1121 | page = vm_normal_page(vma, addr, pte); | |
1122 | if (!page) | |
1123 | return NULL; | |
1124 | ||
1125 | if (PageReserved(page)) | |
1126 | return NULL; | |
1127 | ||
1128 | nid = page_to_nid(page); | |
1129 | if (!node_isset(nid, node_states[N_HIGH_MEMORY])) | |
1130 | return NULL; | |
1131 | ||
1132 | return page; | |
1133 | } | |
1134 | ||
f69ff943 SW |
1135 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1136 | unsigned long end, struct mm_walk *walk) | |
1137 | { | |
1138 | struct numa_maps *md; | |
1139 | spinlock_t *ptl; | |
1140 | pte_t *orig_pte; | |
1141 | pte_t *pte; | |
1142 | ||
1143 | md = walk->private; | |
025c5b24 NH |
1144 | |
1145 | if (pmd_trans_huge_lock(pmd, md->vma) == 1) { | |
1146 | pte_t huge_pte = *(pte_t *)pmd; | |
1147 | struct page *page; | |
1148 | ||
1149 | page = can_gather_numa_stats(huge_pte, md->vma, addr); | |
1150 | if (page) | |
1151 | gather_stats(page, md, pte_dirty(huge_pte), | |
1152 | HPAGE_PMD_SIZE/PAGE_SIZE); | |
32ef4384 | 1153 | spin_unlock(&walk->mm->page_table_lock); |
025c5b24 | 1154 | return 0; |
32ef4384 DH |
1155 | } |
1156 | ||
1a5a9906 AA |
1157 | if (pmd_trans_unstable(pmd)) |
1158 | return 0; | |
f69ff943 SW |
1159 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1160 | do { | |
3200a8aa | 1161 | struct page *page = can_gather_numa_stats(*pte, md->vma, addr); |
f69ff943 SW |
1162 | if (!page) |
1163 | continue; | |
eb4866d0 | 1164 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1165 | |
1166 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1167 | pte_unmap_unlock(orig_pte, ptl); | |
1168 | return 0; | |
1169 | } | |
1170 | #ifdef CONFIG_HUGETLB_PAGE | |
1171 | static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask, | |
1172 | unsigned long addr, unsigned long end, struct mm_walk *walk) | |
1173 | { | |
1174 | struct numa_maps *md; | |
1175 | struct page *page; | |
1176 | ||
1177 | if (pte_none(*pte)) | |
1178 | return 0; | |
1179 | ||
1180 | page = pte_page(*pte); | |
1181 | if (!page) | |
1182 | return 0; | |
1183 | ||
1184 | md = walk->private; | |
eb4866d0 | 1185 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1186 | return 0; |
1187 | } | |
1188 | ||
1189 | #else | |
1190 | static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask, | |
1191 | unsigned long addr, unsigned long end, struct mm_walk *walk) | |
1192 | { | |
1193 | return 0; | |
1194 | } | |
1195 | #endif | |
1196 | ||
1197 | /* | |
1198 | * Display pages allocated per node and memory policy via /proc. | |
1199 | */ | |
b7643757 | 1200 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1201 | { |
5b52fc89 SW |
1202 | struct numa_maps_private *numa_priv = m->private; |
1203 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1204 | struct vm_area_struct *vma = v; |
5b52fc89 | 1205 | struct numa_maps *md = &numa_priv->md; |
f69ff943 | 1206 | struct file *file = vma->vm_file; |
32f8516a | 1207 | struct task_struct *task = proc_priv->task; |
f69ff943 SW |
1208 | struct mm_struct *mm = vma->vm_mm; |
1209 | struct mm_walk walk = {}; | |
1210 | struct mempolicy *pol; | |
1211 | int n; | |
1212 | char buffer[50]; | |
1213 | ||
1214 | if (!mm) | |
1215 | return 0; | |
1216 | ||
5b52fc89 SW |
1217 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1218 | memset(md, 0, sizeof(*md)); | |
f69ff943 SW |
1219 | |
1220 | md->vma = vma; | |
1221 | ||
1222 | walk.hugetlb_entry = gather_hugetbl_stats; | |
1223 | walk.pmd_entry = gather_pte_stats; | |
1224 | walk.private = md; | |
1225 | walk.mm = mm; | |
1226 | ||
32f8516a | 1227 | pol = get_vma_policy(task, vma, vma->vm_start); |
f69ff943 SW |
1228 | mpol_to_str(buffer, sizeof(buffer), pol, 0); |
1229 | mpol_cond_put(pol); | |
1230 | ||
1231 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1232 | ||
1233 | if (file) { | |
1234 | seq_printf(m, " file="); | |
1235 | seq_path(m, &file->f_path, "\n\t= "); | |
1236 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { | |
1237 | seq_printf(m, " heap"); | |
b7643757 | 1238 | } else { |
32f8516a | 1239 | pid_t tid = vm_is_stack(task, vma, is_pid); |
b7643757 SP |
1240 | if (tid != 0) { |
1241 | /* | |
1242 | * Thread stack in /proc/PID/task/TID/maps or | |
1243 | * the main process stack. | |
1244 | */ | |
1245 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
1246 | vma->vm_end >= mm->start_stack)) | |
1247 | seq_printf(m, " stack"); | |
1248 | else | |
1249 | seq_printf(m, " stack:%d", tid); | |
1250 | } | |
f69ff943 SW |
1251 | } |
1252 | ||
fc360bd9 AM |
1253 | if (is_vm_hugetlb_page(vma)) |
1254 | seq_printf(m, " huge"); | |
1255 | ||
f69ff943 SW |
1256 | walk_page_range(vma->vm_start, vma->vm_end, &walk); |
1257 | ||
1258 | if (!md->pages) | |
1259 | goto out; | |
1260 | ||
1261 | if (md->anon) | |
1262 | seq_printf(m, " anon=%lu", md->anon); | |
1263 | ||
1264 | if (md->dirty) | |
1265 | seq_printf(m, " dirty=%lu", md->dirty); | |
1266 | ||
1267 | if (md->pages != md->anon && md->pages != md->dirty) | |
1268 | seq_printf(m, " mapped=%lu", md->pages); | |
1269 | ||
1270 | if (md->mapcount_max > 1) | |
1271 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1272 | ||
1273 | if (md->swapcache) | |
1274 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1275 | ||
1276 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1277 | seq_printf(m, " active=%lu", md->active); | |
1278 | ||
1279 | if (md->writeback) | |
1280 | seq_printf(m, " writeback=%lu", md->writeback); | |
1281 | ||
1282 | for_each_node_state(n, N_HIGH_MEMORY) | |
1283 | if (md->node[n]) | |
1284 | seq_printf(m, " N%d=%lu", n, md->node[n]); | |
1285 | out: | |
1286 | seq_putc(m, '\n'); | |
f69ff943 SW |
1287 | |
1288 | if (m->count < m->size) | |
5b52fc89 | 1289 | m->version = (vma != proc_priv->tail_vma) ? vma->vm_start : 0; |
f69ff943 SW |
1290 | return 0; |
1291 | } | |
5b52fc89 | 1292 | |
b7643757 SP |
1293 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1294 | { | |
1295 | return show_numa_map(m, v, 1); | |
1296 | } | |
1297 | ||
1298 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1299 | { | |
1300 | return show_numa_map(m, v, 0); | |
1301 | } | |
1302 | ||
03a44825 | 1303 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1304 | .start = m_start, |
1305 | .next = m_next, | |
1306 | .stop = m_stop, | |
1307 | .show = show_pid_numa_map, | |
6e21c8f1 | 1308 | }; |
662795de | 1309 | |
b7643757 SP |
1310 | static const struct seq_operations proc_tid_numa_maps_op = { |
1311 | .start = m_start, | |
1312 | .next = m_next, | |
1313 | .stop = m_stop, | |
1314 | .show = show_tid_numa_map, | |
1315 | }; | |
1316 | ||
1317 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1318 | const struct seq_operations *ops) | |
662795de | 1319 | { |
5b52fc89 SW |
1320 | struct numa_maps_private *priv; |
1321 | int ret = -ENOMEM; | |
1322 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
1323 | if (priv) { | |
1324 | priv->proc_maps.pid = proc_pid(inode); | |
b7643757 | 1325 | ret = seq_open(file, ops); |
5b52fc89 SW |
1326 | if (!ret) { |
1327 | struct seq_file *m = file->private_data; | |
1328 | m->private = priv; | |
1329 | } else { | |
1330 | kfree(priv); | |
1331 | } | |
1332 | } | |
1333 | return ret; | |
662795de EB |
1334 | } |
1335 | ||
b7643757 SP |
1336 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1337 | { | |
1338 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1339 | } | |
1340 | ||
1341 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1342 | { | |
1343 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1344 | } | |
1345 | ||
1346 | const struct file_operations proc_pid_numa_maps_operations = { | |
1347 | .open = pid_numa_maps_open, | |
1348 | .read = seq_read, | |
1349 | .llseek = seq_lseek, | |
1350 | .release = seq_release_private, | |
1351 | }; | |
1352 | ||
1353 | const struct file_operations proc_tid_numa_maps_operations = { | |
1354 | .open = tid_numa_maps_open, | |
662795de EB |
1355 | .read = seq_read, |
1356 | .llseek = seq_lseek, | |
99f89551 | 1357 | .release = seq_release_private, |
662795de | 1358 | }; |
f69ff943 | 1359 | #endif /* CONFIG_NUMA */ |