Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/mm.h> |
615d6e87 | 2 | #include <linux/vmacache.h> |
1da177e4 | 3 | #include <linux/hugetlb.h> |
22e057c5 | 4 | #include <linux/huge_mm.h> |
1da177e4 LT |
5 | #include <linux/mount.h> |
6 | #include <linux/seq_file.h> | |
e070ad49 | 7 | #include <linux/highmem.h> |
5096add8 | 8 | #include <linux/ptrace.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
6e21c8f1 CL |
10 | #include <linux/pagemap.h> |
11 | #include <linux/mempolicy.h> | |
22e057c5 | 12 | #include <linux/rmap.h> |
85863e47 MM |
13 | #include <linux/swap.h> |
14 | #include <linux/swapops.h> | |
0f8975ec | 15 | #include <linux/mmu_notifier.h> |
e070ad49 | 16 | |
1da177e4 LT |
17 | #include <asm/elf.h> |
18 | #include <asm/uaccess.h> | |
e070ad49 | 19 | #include <asm/tlbflush.h> |
1da177e4 LT |
20 | #include "internal.h" |
21 | ||
df5f8314 | 22 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 23 | { |
b084d435 | 24 | unsigned long data, text, lib, swap; |
365e9c87 HD |
25 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
26 | ||
27 | /* | |
28 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
29 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
30 | * collector of these hiwater stats must therefore get total_vm | |
31 | * and rss too, which will usually be the higher. Barriers? not | |
32 | * worth the effort, such snapshots can always be inconsistent. | |
33 | */ | |
34 | hiwater_vm = total_vm = mm->total_vm; | |
35 | if (hiwater_vm < mm->hiwater_vm) | |
36 | hiwater_vm = mm->hiwater_vm; | |
37 | hiwater_rss = total_rss = get_mm_rss(mm); | |
38 | if (hiwater_rss < mm->hiwater_rss) | |
39 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 LT |
40 | |
41 | data = mm->total_vm - mm->shared_vm - mm->stack_vm; | |
42 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; | |
43 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 44 | swap = get_mm_counter(mm, MM_SWAPENTS); |
df5f8314 | 45 | seq_printf(m, |
365e9c87 | 46 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
47 | "VmSize:\t%8lu kB\n" |
48 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 49 | "VmPin:\t%8lu kB\n" |
365e9c87 | 50 | "VmHWM:\t%8lu kB\n" |
1da177e4 LT |
51 | "VmRSS:\t%8lu kB\n" |
52 | "VmData:\t%8lu kB\n" | |
53 | "VmStk:\t%8lu kB\n" | |
54 | "VmExe:\t%8lu kB\n" | |
55 | "VmLib:\t%8lu kB\n" | |
b084d435 KH |
56 | "VmPTE:\t%8lu kB\n" |
57 | "VmSwap:\t%8lu kB\n", | |
365e9c87 | 58 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 59 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 60 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 61 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
62 | hiwater_rss << (PAGE_SHIFT-10), |
63 | total_rss << (PAGE_SHIFT-10), | |
1da177e4 LT |
64 | data << (PAGE_SHIFT-10), |
65 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, | |
e1f56c89 KS |
66 | (PTRS_PER_PTE * sizeof(pte_t) * |
67 | atomic_long_read(&mm->nr_ptes)) >> 10, | |
b084d435 | 68 | swap << (PAGE_SHIFT-10)); |
1da177e4 LT |
69 | } |
70 | ||
71 | unsigned long task_vsize(struct mm_struct *mm) | |
72 | { | |
73 | return PAGE_SIZE * mm->total_vm; | |
74 | } | |
75 | ||
a2ade7b6 AD |
76 | unsigned long task_statm(struct mm_struct *mm, |
77 | unsigned long *shared, unsigned long *text, | |
78 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 79 | { |
d559db08 | 80 | *shared = get_mm_counter(mm, MM_FILEPAGES); |
1da177e4 LT |
81 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
82 | >> PAGE_SHIFT; | |
83 | *data = mm->total_vm - mm->shared_vm; | |
d559db08 | 84 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
85 | return mm->total_vm; |
86 | } | |
87 | ||
9e781440 KH |
88 | #ifdef CONFIG_NUMA |
89 | /* | |
498f2371 | 90 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
91 | */ |
92 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
93 | { | |
94 | struct task_struct *task = priv->task; | |
95 | ||
96 | task_lock(task); | |
498f2371 | 97 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
98 | mpol_get(priv->task_mempolicy); |
99 | task_unlock(task); | |
100 | } | |
101 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
102 | { | |
103 | mpol_put(priv->task_mempolicy); | |
104 | } | |
105 | #else | |
106 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
107 | { | |
108 | } | |
109 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
110 | { | |
111 | } | |
112 | #endif | |
113 | ||
59b4bf12 | 114 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 115 | { |
59b4bf12 ON |
116 | struct mm_struct *mm = priv->mm; |
117 | ||
118 | release_task_mempolicy(priv); | |
119 | up_read(&mm->mmap_sem); | |
120 | mmput(mm); | |
a6198797 | 121 | } |
ec4dd3eb | 122 | |
ad2a00e4 ON |
123 | static struct vm_area_struct * |
124 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
125 | { | |
126 | if (vma == priv->tail_vma) | |
127 | return NULL; | |
128 | return vma->vm_next ?: priv->tail_vma; | |
129 | } | |
130 | ||
b8c20a9b ON |
131 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
132 | { | |
133 | if (m->count < m->size) /* vma is copied successfully */ | |
134 | m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL; | |
135 | } | |
136 | ||
0c255321 | 137 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 138 | { |
a6198797 | 139 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 140 | unsigned long last_addr = m->version; |
a6198797 | 141 | struct mm_struct *mm; |
0c255321 ON |
142 | struct vm_area_struct *vma; |
143 | unsigned int pos = *ppos; | |
a6198797 | 144 | |
b8c20a9b ON |
145 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
146 | if (last_addr == -1UL) | |
147 | return NULL; | |
148 | ||
2c03376d | 149 | priv->task = get_proc_task(priv->inode); |
a6198797 | 150 | if (!priv->task) |
ec6fd8a4 | 151 | return ERR_PTR(-ESRCH); |
a6198797 | 152 | |
29a40ace ON |
153 | mm = priv->mm; |
154 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) | |
155 | return NULL; | |
a6198797 | 156 | |
0c255321 | 157 | down_read(&mm->mmap_sem); |
9e781440 | 158 | hold_task_mempolicy(priv); |
0c255321 | 159 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 160 | |
b8c20a9b ON |
161 | if (last_addr) { |
162 | vma = find_vma(mm, last_addr); | |
163 | if (vma && (vma = m_next_vma(priv, vma))) | |
164 | return vma; | |
165 | } | |
166 | ||
167 | m->version = 0; | |
0c255321 | 168 | if (pos < mm->map_count) { |
557c2d8a ON |
169 | for (vma = mm->mmap; pos; pos--) { |
170 | m->version = vma->vm_start; | |
a6198797 | 171 | vma = vma->vm_next; |
557c2d8a | 172 | } |
a6198797 | 173 | return vma; |
0c255321 | 174 | } |
a6198797 | 175 | |
557c2d8a | 176 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
177 | if (pos == mm->map_count && priv->tail_vma) |
178 | return priv->tail_vma; | |
59b4bf12 ON |
179 | |
180 | vma_stop(priv); | |
181 | return NULL; | |
a6198797 MM |
182 | } |
183 | ||
184 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
185 | { | |
186 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 187 | struct vm_area_struct *next; |
a6198797 MM |
188 | |
189 | (*pos)++; | |
ad2a00e4 | 190 | next = m_next_vma(priv, v); |
59b4bf12 ON |
191 | if (!next) |
192 | vma_stop(priv); | |
193 | return next; | |
a6198797 MM |
194 | } |
195 | ||
196 | static void m_stop(struct seq_file *m, void *v) | |
197 | { | |
198 | struct proc_maps_private *priv = m->private; | |
a6198797 | 199 | |
59b4bf12 ON |
200 | if (!IS_ERR_OR_NULL(v)) |
201 | vma_stop(priv); | |
0d5f5f45 | 202 | if (priv->task) { |
a6198797 | 203 | put_task_struct(priv->task); |
0d5f5f45 ON |
204 | priv->task = NULL; |
205 | } | |
a6198797 MM |
206 | } |
207 | ||
4db7d0ee ON |
208 | static int proc_maps_open(struct inode *inode, struct file *file, |
209 | const struct seq_operations *ops, int psize) | |
210 | { | |
211 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
212 | ||
213 | if (!priv) | |
214 | return -ENOMEM; | |
215 | ||
2c03376d | 216 | priv->inode = inode; |
29a40ace ON |
217 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
218 | if (IS_ERR(priv->mm)) { | |
219 | int err = PTR_ERR(priv->mm); | |
220 | ||
221 | seq_release_private(inode, file); | |
222 | return err; | |
223 | } | |
224 | ||
4db7d0ee ON |
225 | return 0; |
226 | } | |
227 | ||
29a40ace ON |
228 | static int proc_map_release(struct inode *inode, struct file *file) |
229 | { | |
230 | struct seq_file *seq = file->private_data; | |
231 | struct proc_maps_private *priv = seq->private; | |
232 | ||
233 | if (priv->mm) | |
234 | mmdrop(priv->mm); | |
235 | ||
236 | return seq_release_private(inode, file); | |
237 | } | |
238 | ||
a6198797 | 239 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 240 | const struct seq_operations *ops) |
a6198797 | 241 | { |
4db7d0ee ON |
242 | return proc_maps_open(inode, file, ops, |
243 | sizeof(struct proc_maps_private)); | |
a6198797 | 244 | } |
e070ad49 | 245 | |
58cb6548 ON |
246 | static pid_t pid_of_stack(struct proc_maps_private *priv, |
247 | struct vm_area_struct *vma, bool is_pid) | |
248 | { | |
249 | struct inode *inode = priv->inode; | |
250 | struct task_struct *task; | |
251 | pid_t ret = 0; | |
252 | ||
253 | rcu_read_lock(); | |
254 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
255 | if (task) { | |
256 | task = task_of_stack(task, vma, is_pid); | |
257 | if (task) | |
258 | ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info); | |
259 | } | |
260 | rcu_read_unlock(); | |
261 | ||
262 | return ret; | |
263 | } | |
264 | ||
b7643757 SP |
265 | static void |
266 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 267 | { |
e070ad49 ML |
268 | struct mm_struct *mm = vma->vm_mm; |
269 | struct file *file = vma->vm_file; | |
b7643757 | 270 | struct proc_maps_private *priv = m->private; |
ca16d140 | 271 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 272 | unsigned long ino = 0; |
6260a4b0 | 273 | unsigned long long pgoff = 0; |
a09a79f6 | 274 | unsigned long start, end; |
1da177e4 | 275 | dev_t dev = 0; |
b7643757 | 276 | const char *name = NULL; |
1da177e4 LT |
277 | |
278 | if (file) { | |
496ad9aa | 279 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
280 | dev = inode->i_sb->s_dev; |
281 | ino = inode->i_ino; | |
6260a4b0 | 282 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
283 | } |
284 | ||
d7824370 LT |
285 | /* We don't show the stack guard page in /proc/maps */ |
286 | start = vma->vm_start; | |
a09a79f6 MP |
287 | if (stack_guard_page_start(vma, start)) |
288 | start += PAGE_SIZE; | |
289 | end = vma->vm_end; | |
290 | if (stack_guard_page_end(vma, end)) | |
291 | end -= PAGE_SIZE; | |
d7824370 | 292 | |
652586df TH |
293 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
294 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", | |
d7824370 | 295 | start, |
a09a79f6 | 296 | end, |
1da177e4 LT |
297 | flags & VM_READ ? 'r' : '-', |
298 | flags & VM_WRITE ? 'w' : '-', | |
299 | flags & VM_EXEC ? 'x' : '-', | |
300 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 301 | pgoff, |
652586df | 302 | MAJOR(dev), MINOR(dev), ino); |
1da177e4 LT |
303 | |
304 | /* | |
305 | * Print the dentry name for named mappings, and a | |
306 | * special [heap] marker for the heap: | |
307 | */ | |
e070ad49 | 308 | if (file) { |
652586df | 309 | seq_pad(m, ' '); |
c32c2f63 | 310 | seq_path(m, &file->f_path, "\n"); |
b7643757 SP |
311 | goto done; |
312 | } | |
313 | ||
78d683e8 AL |
314 | if (vma->vm_ops && vma->vm_ops->name) { |
315 | name = vma->vm_ops->name(vma); | |
316 | if (name) | |
317 | goto done; | |
318 | } | |
319 | ||
b7643757 SP |
320 | name = arch_vma_name(vma); |
321 | if (!name) { | |
322 | pid_t tid; | |
323 | ||
324 | if (!mm) { | |
325 | name = "[vdso]"; | |
326 | goto done; | |
327 | } | |
328 | ||
329 | if (vma->vm_start <= mm->brk && | |
330 | vma->vm_end >= mm->start_brk) { | |
331 | name = "[heap]"; | |
332 | goto done; | |
333 | } | |
334 | ||
58cb6548 | 335 | tid = pid_of_stack(priv, vma, is_pid); |
b7643757 SP |
336 | if (tid != 0) { |
337 | /* | |
338 | * Thread stack in /proc/PID/task/TID/maps or | |
339 | * the main process stack. | |
340 | */ | |
341 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
342 | vma->vm_end >= mm->start_stack)) { | |
343 | name = "[stack]"; | |
e6e5494c | 344 | } else { |
b7643757 | 345 | /* Thread stack in /proc/PID/maps */ |
652586df | 346 | seq_pad(m, ' '); |
b7643757 | 347 | seq_printf(m, "[stack:%d]", tid); |
1da177e4 | 348 | } |
e6e5494c | 349 | } |
b7643757 SP |
350 | } |
351 | ||
352 | done: | |
353 | if (name) { | |
652586df | 354 | seq_pad(m, ' '); |
b7643757 | 355 | seq_puts(m, name); |
1da177e4 LT |
356 | } |
357 | seq_putc(m, '\n'); | |
7c88db0c JK |
358 | } |
359 | ||
b7643757 | 360 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c | 361 | { |
ebb6cdde | 362 | show_map_vma(m, v, is_pid); |
b8c20a9b | 363 | m_cache_vma(m, v); |
1da177e4 LT |
364 | return 0; |
365 | } | |
366 | ||
b7643757 SP |
367 | static int show_pid_map(struct seq_file *m, void *v) |
368 | { | |
369 | return show_map(m, v, 1); | |
370 | } | |
371 | ||
372 | static int show_tid_map(struct seq_file *m, void *v) | |
373 | { | |
374 | return show_map(m, v, 0); | |
375 | } | |
376 | ||
03a44825 | 377 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
378 | .start = m_start, |
379 | .next = m_next, | |
380 | .stop = m_stop, | |
b7643757 SP |
381 | .show = show_pid_map |
382 | }; | |
383 | ||
384 | static const struct seq_operations proc_tid_maps_op = { | |
385 | .start = m_start, | |
386 | .next = m_next, | |
387 | .stop = m_stop, | |
388 | .show = show_tid_map | |
a6198797 MM |
389 | }; |
390 | ||
b7643757 | 391 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
392 | { |
393 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
394 | } | |
395 | ||
b7643757 SP |
396 | static int tid_maps_open(struct inode *inode, struct file *file) |
397 | { | |
398 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
399 | } | |
400 | ||
401 | const struct file_operations proc_pid_maps_operations = { | |
402 | .open = pid_maps_open, | |
403 | .read = seq_read, | |
404 | .llseek = seq_lseek, | |
29a40ace | 405 | .release = proc_map_release, |
b7643757 SP |
406 | }; |
407 | ||
408 | const struct file_operations proc_tid_maps_operations = { | |
409 | .open = tid_maps_open, | |
a6198797 MM |
410 | .read = seq_read, |
411 | .llseek = seq_lseek, | |
29a40ace | 412 | .release = proc_map_release, |
a6198797 MM |
413 | }; |
414 | ||
415 | /* | |
416 | * Proportional Set Size(PSS): my share of RSS. | |
417 | * | |
418 | * PSS of a process is the count of pages it has in memory, where each | |
419 | * page is divided by the number of processes sharing it. So if a | |
420 | * process has 1000 pages all to itself, and 1000 shared with one other | |
421 | * process, its PSS will be 1500. | |
422 | * | |
423 | * To keep (accumulated) division errors low, we adopt a 64bit | |
424 | * fixed-point pss counter to minimize division errors. So (pss >> | |
425 | * PSS_SHIFT) would be the real byte count. | |
426 | * | |
427 | * A shift of 12 before division means (assuming 4K page size): | |
428 | * - 1M 3-user-pages add up to 8KB errors; | |
429 | * - supports mapcount up to 2^24, or 16M; | |
430 | * - supports PSS up to 2^52 bytes, or 4PB. | |
431 | */ | |
432 | #define PSS_SHIFT 12 | |
433 | ||
1e883281 | 434 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 435 | struct mem_size_stats { |
a6198797 MM |
436 | struct vm_area_struct *vma; |
437 | unsigned long resident; | |
438 | unsigned long shared_clean; | |
439 | unsigned long shared_dirty; | |
440 | unsigned long private_clean; | |
441 | unsigned long private_dirty; | |
442 | unsigned long referenced; | |
b40d4f84 | 443 | unsigned long anonymous; |
4031a219 | 444 | unsigned long anonymous_thp; |
214e471f | 445 | unsigned long swap; |
a6198797 MM |
446 | u64 pss; |
447 | }; | |
448 | ||
c164e038 KS |
449 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
450 | unsigned long size, bool young, bool dirty) | |
451 | { | |
452 | int mapcount; | |
453 | ||
454 | if (PageAnon(page)) | |
455 | mss->anonymous += size; | |
456 | ||
457 | mss->resident += size; | |
458 | /* Accumulate the size in pages that have been accessed. */ | |
459 | if (young || PageReferenced(page)) | |
460 | mss->referenced += size; | |
461 | mapcount = page_mapcount(page); | |
462 | if (mapcount >= 2) { | |
463 | u64 pss_delta; | |
464 | ||
465 | if (dirty || PageDirty(page)) | |
466 | mss->shared_dirty += size; | |
467 | else | |
468 | mss->shared_clean += size; | |
469 | pss_delta = (u64)size << PSS_SHIFT; | |
470 | do_div(pss_delta, mapcount); | |
471 | mss->pss += pss_delta; | |
472 | } else { | |
473 | if (dirty || PageDirty(page)) | |
474 | mss->private_dirty += size; | |
475 | else | |
476 | mss->private_clean += size; | |
477 | mss->pss += (u64)size << PSS_SHIFT; | |
478 | } | |
479 | } | |
ae11c4d9 | 480 | |
c164e038 KS |
481 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
482 | struct mm_walk *walk) | |
ae11c4d9 DH |
483 | { |
484 | struct mem_size_stats *mss = walk->private; | |
485 | struct vm_area_struct *vma = mss->vma; | |
b1d4d9e0 | 486 | struct page *page = NULL; |
ae11c4d9 | 487 | |
c164e038 KS |
488 | if (pte_present(*pte)) { |
489 | page = vm_normal_page(vma, addr, *pte); | |
490 | } else if (is_swap_pte(*pte)) { | |
491 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 492 | |
b1d4d9e0 | 493 | if (!non_swap_entry(swpent)) |
c164e038 | 494 | mss->swap += PAGE_SIZE; |
b1d4d9e0 KK |
495 | else if (is_migration_entry(swpent)) |
496 | page = migration_entry_to_page(swpent); | |
497 | } | |
ae11c4d9 | 498 | |
ae11c4d9 DH |
499 | if (!page) |
500 | return; | |
c164e038 | 501 | smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte)); |
ae11c4d9 DH |
502 | } |
503 | ||
c164e038 KS |
504 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
505 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
506 | struct mm_walk *walk) | |
507 | { | |
508 | struct mem_size_stats *mss = walk->private; | |
509 | struct vm_area_struct *vma = mss->vma; | |
510 | struct page *page; | |
511 | ||
512 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
513 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
514 | if (IS_ERR_OR_NULL(page)) | |
515 | return; | |
516 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
517 | smaps_account(mss, page, HPAGE_PMD_SIZE, | |
518 | pmd_young(*pmd), pmd_dirty(*pmd)); | |
519 | } | |
520 | #else | |
521 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
522 | struct mm_walk *walk) | |
523 | { | |
524 | } | |
525 | #endif | |
526 | ||
b3ae5acb | 527 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 528 | struct mm_walk *walk) |
e070ad49 | 529 | { |
2165009b | 530 | struct mem_size_stats *mss = walk->private; |
b3ae5acb | 531 | struct vm_area_struct *vma = mss->vma; |
ae11c4d9 | 532 | pte_t *pte; |
705e87c0 | 533 | spinlock_t *ptl; |
e070ad49 | 534 | |
bf929152 | 535 | if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { |
c164e038 | 536 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 537 | spin_unlock(ptl); |
025c5b24 | 538 | return 0; |
22e057c5 | 539 | } |
1a5a9906 AA |
540 | |
541 | if (pmd_trans_unstable(pmd)) | |
542 | return 0; | |
22e057c5 DH |
543 | /* |
544 | * The mmap_sem held all the way back in m_start() is what | |
545 | * keeps khugepaged out of here and from collapsing things | |
546 | * in here. | |
547 | */ | |
705e87c0 | 548 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 549 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 550 | smaps_pte_entry(pte, addr, walk); |
705e87c0 HD |
551 | pte_unmap_unlock(pte - 1, ptl); |
552 | cond_resched(); | |
b3ae5acb | 553 | return 0; |
e070ad49 ML |
554 | } |
555 | ||
834f82e2 CG |
556 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
557 | { | |
558 | /* | |
559 | * Don't forget to update Documentation/ on changes. | |
560 | */ | |
561 | static const char mnemonics[BITS_PER_LONG][2] = { | |
562 | /* | |
563 | * In case if we meet a flag we don't know about. | |
564 | */ | |
565 | [0 ... (BITS_PER_LONG-1)] = "??", | |
566 | ||
567 | [ilog2(VM_READ)] = "rd", | |
568 | [ilog2(VM_WRITE)] = "wr", | |
569 | [ilog2(VM_EXEC)] = "ex", | |
570 | [ilog2(VM_SHARED)] = "sh", | |
571 | [ilog2(VM_MAYREAD)] = "mr", | |
572 | [ilog2(VM_MAYWRITE)] = "mw", | |
573 | [ilog2(VM_MAYEXEC)] = "me", | |
574 | [ilog2(VM_MAYSHARE)] = "ms", | |
575 | [ilog2(VM_GROWSDOWN)] = "gd", | |
576 | [ilog2(VM_PFNMAP)] = "pf", | |
577 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
578 | #ifdef CONFIG_X86_INTEL_MPX |
579 | [ilog2(VM_MPX)] = "mp", | |
580 | #endif | |
834f82e2 CG |
581 | [ilog2(VM_LOCKED)] = "lo", |
582 | [ilog2(VM_IO)] = "io", | |
583 | [ilog2(VM_SEQ_READ)] = "sr", | |
584 | [ilog2(VM_RAND_READ)] = "rr", | |
585 | [ilog2(VM_DONTCOPY)] = "dc", | |
586 | [ilog2(VM_DONTEXPAND)] = "de", | |
587 | [ilog2(VM_ACCOUNT)] = "ac", | |
588 | [ilog2(VM_NORESERVE)] = "nr", | |
589 | [ilog2(VM_HUGETLB)] = "ht", | |
834f82e2 CG |
590 | [ilog2(VM_ARCH_1)] = "ar", |
591 | [ilog2(VM_DONTDUMP)] = "dd", | |
ec8e41ae NH |
592 | #ifdef CONFIG_MEM_SOFT_DIRTY |
593 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
594 | #endif | |
834f82e2 CG |
595 | [ilog2(VM_MIXEDMAP)] = "mm", |
596 | [ilog2(VM_HUGEPAGE)] = "hg", | |
597 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
598 | [ilog2(VM_MERGEABLE)] = "mg", | |
599 | }; | |
600 | size_t i; | |
601 | ||
602 | seq_puts(m, "VmFlags: "); | |
603 | for (i = 0; i < BITS_PER_LONG; i++) { | |
604 | if (vma->vm_flags & (1UL << i)) { | |
605 | seq_printf(m, "%c%c ", | |
606 | mnemonics[i][0], mnemonics[i][1]); | |
607 | } | |
608 | } | |
609 | seq_putc(m, '\n'); | |
610 | } | |
611 | ||
b7643757 | 612 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 ML |
613 | { |
614 | struct vm_area_struct *vma = v; | |
e070ad49 | 615 | struct mem_size_stats mss; |
2165009b DH |
616 | struct mm_walk smaps_walk = { |
617 | .pmd_entry = smaps_pte_range, | |
618 | .mm = vma->vm_mm, | |
619 | .private = &mss, | |
620 | }; | |
e070ad49 ML |
621 | |
622 | memset(&mss, 0, sizeof mss); | |
b3ae5acb | 623 | mss.vma = vma; |
d82ef020 | 624 | /* mmap_sem is held in m_start */ |
5ddfae16 | 625 | if (vma->vm_mm && !is_vm_hugetlb_page(vma)) |
2165009b | 626 | walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); |
4752c369 | 627 | |
b7643757 | 628 | show_map_vma(m, vma, is_pid); |
4752c369 MM |
629 | |
630 | seq_printf(m, | |
631 | "Size: %8lu kB\n" | |
632 | "Rss: %8lu kB\n" | |
633 | "Pss: %8lu kB\n" | |
634 | "Shared_Clean: %8lu kB\n" | |
635 | "Shared_Dirty: %8lu kB\n" | |
636 | "Private_Clean: %8lu kB\n" | |
637 | "Private_Dirty: %8lu kB\n" | |
214e471f | 638 | "Referenced: %8lu kB\n" |
b40d4f84 | 639 | "Anonymous: %8lu kB\n" |
4031a219 | 640 | "AnonHugePages: %8lu kB\n" |
08fba699 | 641 | "Swap: %8lu kB\n" |
3340289d | 642 | "KernelPageSize: %8lu kB\n" |
2d90508f NK |
643 | "MMUPageSize: %8lu kB\n" |
644 | "Locked: %8lu kB\n", | |
4752c369 MM |
645 | (vma->vm_end - vma->vm_start) >> 10, |
646 | mss.resident >> 10, | |
647 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
648 | mss.shared_clean >> 10, | |
649 | mss.shared_dirty >> 10, | |
650 | mss.private_clean >> 10, | |
651 | mss.private_dirty >> 10, | |
214e471f | 652 | mss.referenced >> 10, |
b40d4f84 | 653 | mss.anonymous >> 10, |
4031a219 | 654 | mss.anonymous_thp >> 10, |
08fba699 | 655 | mss.swap >> 10, |
3340289d | 656 | vma_kernel_pagesize(vma) >> 10, |
2d90508f NK |
657 | vma_mmu_pagesize(vma) >> 10, |
658 | (vma->vm_flags & VM_LOCKED) ? | |
659 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); | |
4752c369 | 660 | |
834f82e2 | 661 | show_smap_vma_flags(m, vma); |
b8c20a9b | 662 | m_cache_vma(m, vma); |
7c88db0c | 663 | return 0; |
e070ad49 ML |
664 | } |
665 | ||
b7643757 SP |
666 | static int show_pid_smap(struct seq_file *m, void *v) |
667 | { | |
668 | return show_smap(m, v, 1); | |
669 | } | |
670 | ||
671 | static int show_tid_smap(struct seq_file *m, void *v) | |
672 | { | |
673 | return show_smap(m, v, 0); | |
674 | } | |
675 | ||
03a44825 | 676 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
677 | .start = m_start, |
678 | .next = m_next, | |
679 | .stop = m_stop, | |
b7643757 SP |
680 | .show = show_pid_smap |
681 | }; | |
682 | ||
683 | static const struct seq_operations proc_tid_smaps_op = { | |
684 | .start = m_start, | |
685 | .next = m_next, | |
686 | .stop = m_stop, | |
687 | .show = show_tid_smap | |
a6198797 MM |
688 | }; |
689 | ||
b7643757 | 690 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
691 | { |
692 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
693 | } | |
694 | ||
b7643757 SP |
695 | static int tid_smaps_open(struct inode *inode, struct file *file) |
696 | { | |
697 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
698 | } | |
699 | ||
700 | const struct file_operations proc_pid_smaps_operations = { | |
701 | .open = pid_smaps_open, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
29a40ace | 704 | .release = proc_map_release, |
b7643757 SP |
705 | }; |
706 | ||
707 | const struct file_operations proc_tid_smaps_operations = { | |
708 | .open = tid_smaps_open, | |
a6198797 MM |
709 | .read = seq_read, |
710 | .llseek = seq_lseek, | |
29a40ace | 711 | .release = proc_map_release, |
a6198797 MM |
712 | }; |
713 | ||
541c237c PE |
714 | /* |
715 | * We do not want to have constant page-shift bits sitting in | |
716 | * pagemap entries and are about to reuse them some time soon. | |
717 | * | |
718 | * Here's the "migration strategy": | |
719 | * 1. when the system boots these bits remain what they are, | |
720 | * but a warning about future change is printed in log; | |
721 | * 2. once anyone clears soft-dirty bits via clear_refs file, | |
722 | * these flag is set to denote, that user is aware of the | |
723 | * new API and those page-shift bits change their meaning. | |
724 | * The respective warning is printed in dmesg; | |
725 | * 3. In a couple of releases we will remove all the mentions | |
726 | * of page-shift in pagemap entries. | |
727 | */ | |
728 | ||
729 | static bool soft_dirty_cleared __read_mostly; | |
730 | ||
040fa020 PE |
731 | enum clear_refs_types { |
732 | CLEAR_REFS_ALL = 1, | |
733 | CLEAR_REFS_ANON, | |
734 | CLEAR_REFS_MAPPED, | |
0f8975ec | 735 | CLEAR_REFS_SOFT_DIRTY, |
040fa020 PE |
736 | CLEAR_REFS_LAST, |
737 | }; | |
738 | ||
af9de7eb PE |
739 | struct clear_refs_private { |
740 | struct vm_area_struct *vma; | |
0f8975ec | 741 | enum clear_refs_types type; |
af9de7eb PE |
742 | }; |
743 | ||
0f8975ec PE |
744 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
745 | unsigned long addr, pte_t *pte) | |
746 | { | |
747 | #ifdef CONFIG_MEM_SOFT_DIRTY | |
748 | /* | |
749 | * The soft-dirty tracker uses #PF-s to catch writes | |
750 | * to pages, so write-protect the pte as well. See the | |
751 | * Documentation/vm/soft-dirty.txt for full description | |
752 | * of how soft-dirty works. | |
753 | */ | |
754 | pte_t ptent = *pte; | |
179ef71c CG |
755 | |
756 | if (pte_present(ptent)) { | |
757 | ptent = pte_wrprotect(ptent); | |
758 | ptent = pte_clear_flags(ptent, _PAGE_SOFT_DIRTY); | |
759 | } else if (is_swap_pte(ptent)) { | |
760 | ptent = pte_swp_clear_soft_dirty(ptent); | |
761 | } | |
762 | ||
0f8975ec PE |
763 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
764 | #endif | |
765 | } | |
766 | ||
a6198797 | 767 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 768 | unsigned long end, struct mm_walk *walk) |
a6198797 | 769 | { |
af9de7eb PE |
770 | struct clear_refs_private *cp = walk->private; |
771 | struct vm_area_struct *vma = cp->vma; | |
a6198797 MM |
772 | pte_t *pte, ptent; |
773 | spinlock_t *ptl; | |
774 | struct page *page; | |
775 | ||
e180377f | 776 | split_huge_page_pmd(vma, addr, pmd); |
1a5a9906 AA |
777 | if (pmd_trans_unstable(pmd)) |
778 | return 0; | |
03319327 | 779 | |
a6198797 MM |
780 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
781 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
782 | ptent = *pte; | |
a6198797 | 783 | |
0f8975ec PE |
784 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
785 | clear_soft_dirty(vma, addr, pte); | |
786 | continue; | |
787 | } | |
788 | ||
179ef71c CG |
789 | if (!pte_present(ptent)) |
790 | continue; | |
791 | ||
a6198797 MM |
792 | page = vm_normal_page(vma, addr, ptent); |
793 | if (!page) | |
794 | continue; | |
795 | ||
796 | /* Clear accessed and referenced bits. */ | |
797 | ptep_test_and_clear_young(vma, addr, pte); | |
798 | ClearPageReferenced(page); | |
799 | } | |
800 | pte_unmap_unlock(pte - 1, ptl); | |
801 | cond_resched(); | |
802 | return 0; | |
803 | } | |
804 | ||
f248dcb3 MM |
805 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
806 | size_t count, loff_t *ppos) | |
b813e931 | 807 | { |
f248dcb3 | 808 | struct task_struct *task; |
fb92a4b0 | 809 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 810 | struct mm_struct *mm; |
b813e931 | 811 | struct vm_area_struct *vma; |
040fa020 PE |
812 | enum clear_refs_types type; |
813 | int itype; | |
0a8cb8e3 | 814 | int rv; |
b813e931 | 815 | |
f248dcb3 MM |
816 | memset(buffer, 0, sizeof(buffer)); |
817 | if (count > sizeof(buffer) - 1) | |
818 | count = sizeof(buffer) - 1; | |
819 | if (copy_from_user(buffer, buf, count)) | |
820 | return -EFAULT; | |
040fa020 | 821 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
822 | if (rv < 0) |
823 | return rv; | |
040fa020 PE |
824 | type = (enum clear_refs_types)itype; |
825 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 826 | return -EINVAL; |
541c237c PE |
827 | |
828 | if (type == CLEAR_REFS_SOFT_DIRTY) { | |
829 | soft_dirty_cleared = true; | |
c86c97ff CG |
830 | pr_warn_once("The pagemap bits 55-60 has changed their meaning!" |
831 | " See the linux/Documentation/vm/pagemap.txt for " | |
832 | "details.\n"); | |
541c237c PE |
833 | } |
834 | ||
496ad9aa | 835 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
836 | if (!task) |
837 | return -ESRCH; | |
838 | mm = get_task_mm(task); | |
839 | if (mm) { | |
af9de7eb | 840 | struct clear_refs_private cp = { |
0f8975ec | 841 | .type = type, |
af9de7eb | 842 | }; |
20cbc972 AM |
843 | struct mm_walk clear_refs_walk = { |
844 | .pmd_entry = clear_refs_pte_range, | |
845 | .mm = mm, | |
af9de7eb | 846 | .private = &cp, |
20cbc972 | 847 | }; |
f248dcb3 | 848 | down_read(&mm->mmap_sem); |
64e45507 PF |
849 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
850 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
851 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
852 | continue; | |
853 | up_read(&mm->mmap_sem); | |
854 | down_write(&mm->mmap_sem); | |
855 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
856 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
857 | vma_set_page_prot(vma); | |
858 | } | |
859 | downgrade_write(&mm->mmap_sem); | |
860 | break; | |
861 | } | |
0f8975ec | 862 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 863 | } |
2165009b | 864 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
af9de7eb | 865 | cp.vma = vma; |
398499d5 MB |
866 | if (is_vm_hugetlb_page(vma)) |
867 | continue; | |
868 | /* | |
869 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
870 | * | |
871 | * Writing 2 to /proc/pid/clear_refs only affects | |
872 | * Anonymous pages. | |
873 | * | |
874 | * Writing 3 to /proc/pid/clear_refs only affects file | |
875 | * mapped pages. | |
c86c97ff CG |
876 | * |
877 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
398499d5 MB |
878 | */ |
879 | if (type == CLEAR_REFS_ANON && vma->vm_file) | |
880 | continue; | |
881 | if (type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
882 | continue; | |
883 | walk_page_range(vma->vm_start, vma->vm_end, | |
884 | &clear_refs_walk); | |
2165009b | 885 | } |
0f8975ec PE |
886 | if (type == CLEAR_REFS_SOFT_DIRTY) |
887 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
f248dcb3 MM |
888 | flush_tlb_mm(mm); |
889 | up_read(&mm->mmap_sem); | |
890 | mmput(mm); | |
891 | } | |
892 | put_task_struct(task); | |
fb92a4b0 VL |
893 | |
894 | return count; | |
b813e931 DR |
895 | } |
896 | ||
f248dcb3 MM |
897 | const struct file_operations proc_clear_refs_operations = { |
898 | .write = clear_refs_write, | |
6038f373 | 899 | .llseek = noop_llseek, |
f248dcb3 MM |
900 | }; |
901 | ||
092b50ba NH |
902 | typedef struct { |
903 | u64 pme; | |
904 | } pagemap_entry_t; | |
905 | ||
85863e47 | 906 | struct pagemapread { |
8c829622 | 907 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 908 | pagemap_entry_t *buffer; |
2b0a9f01 | 909 | bool v2; |
85863e47 MM |
910 | }; |
911 | ||
5aaabe83 NH |
912 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
913 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
914 | ||
8c829622 | 915 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
f16278c6 HR |
916 | #define PM_STATUS_BITS 3 |
917 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) | |
918 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) | |
919 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) | |
920 | #define PM_PSHIFT_BITS 6 | |
921 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) | |
922 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) | |
2b0a9f01 | 923 | #define __PM_PSHIFT(x) (((u64) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) |
f16278c6 HR |
924 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) |
925 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) | |
2b0a9f01 PE |
926 | /* in "new" pagemap pshift bits are occupied with more status bits */ |
927 | #define PM_STATUS2(v2, x) (__PM_PSHIFT(v2 ? x : PAGE_SHIFT)) | |
f16278c6 | 928 | |
0f8975ec | 929 | #define __PM_SOFT_DIRTY (1LL) |
f16278c6 HR |
930 | #define PM_PRESENT PM_STATUS(4LL) |
931 | #define PM_SWAP PM_STATUS(2LL) | |
052fb0d6 | 932 | #define PM_FILE PM_STATUS(1LL) |
2b0a9f01 | 933 | #define PM_NOT_PRESENT(v2) PM_STATUS2(v2, 0) |
85863e47 MM |
934 | #define PM_END_OF_BUFFER 1 |
935 | ||
092b50ba NH |
936 | static inline pagemap_entry_t make_pme(u64 val) |
937 | { | |
938 | return (pagemap_entry_t) { .pme = val }; | |
939 | } | |
940 | ||
941 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
942 | struct pagemapread *pm) |
943 | { | |
092b50ba | 944 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 945 | if (pm->pos >= pm->len) |
aae8679b | 946 | return PM_END_OF_BUFFER; |
85863e47 MM |
947 | return 0; |
948 | } | |
949 | ||
950 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 951 | struct mm_walk *walk) |
85863e47 | 952 | { |
2165009b | 953 | struct pagemapread *pm = walk->private; |
68b5a652 | 954 | unsigned long addr = start; |
85863e47 | 955 | int err = 0; |
092b50ba | 956 | |
68b5a652 PF |
957 | while (addr < end) { |
958 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
959 | pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2)); | |
87e6d49a PF |
960 | /* End of address space hole, which we mark as non-present. */ |
961 | unsigned long hole_end; | |
68b5a652 | 962 | |
87e6d49a PF |
963 | if (vma) |
964 | hole_end = min(end, vma->vm_start); | |
965 | else | |
966 | hole_end = end; | |
967 | ||
968 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
969 | err = add_to_pagemap(addr, &pme, pm); | |
970 | if (err) | |
971 | goto out; | |
68b5a652 PF |
972 | } |
973 | ||
87e6d49a PF |
974 | if (!vma) |
975 | break; | |
976 | ||
977 | /* Addresses in the VMA. */ | |
978 | if (vma->vm_flags & VM_SOFTDIRTY) | |
979 | pme.pme |= PM_STATUS2(pm->v2, __PM_SOFT_DIRTY); | |
980 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { | |
68b5a652 PF |
981 | err = add_to_pagemap(addr, &pme, pm); |
982 | if (err) | |
983 | goto out; | |
984 | } | |
85863e47 | 985 | } |
68b5a652 | 986 | out: |
85863e47 MM |
987 | return err; |
988 | } | |
989 | ||
2b0a9f01 | 990 | static void pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, |
052fb0d6 | 991 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 992 | { |
052fb0d6 KK |
993 | u64 frame, flags; |
994 | struct page *page = NULL; | |
0f8975ec | 995 | int flags2 = 0; |
85863e47 | 996 | |
052fb0d6 KK |
997 | if (pte_present(pte)) { |
998 | frame = pte_pfn(pte); | |
999 | flags = PM_PRESENT; | |
1000 | page = vm_normal_page(vma, addr, pte); | |
e9cdd6e7 CG |
1001 | if (pte_soft_dirty(pte)) |
1002 | flags2 |= __PM_SOFT_DIRTY; | |
052fb0d6 | 1003 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1004 | swp_entry_t entry; |
1005 | if (pte_swp_soft_dirty(pte)) | |
1006 | flags2 |= __PM_SOFT_DIRTY; | |
1007 | entry = pte_to_swp_entry(pte); | |
052fb0d6 KK |
1008 | frame = swp_type(entry) | |
1009 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
1010 | flags = PM_SWAP; | |
1011 | if (is_migration_entry(entry)) | |
1012 | page = migration_entry_to_page(entry); | |
1013 | } else { | |
d9104d1c CG |
1014 | if (vma->vm_flags & VM_SOFTDIRTY) |
1015 | flags2 |= __PM_SOFT_DIRTY; | |
1016 | *pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, flags2)); | |
052fb0d6 KK |
1017 | return; |
1018 | } | |
1019 | ||
1020 | if (page && !PageAnon(page)) | |
1021 | flags |= PM_FILE; | |
e9cdd6e7 | 1022 | if ((vma->vm_flags & VM_SOFTDIRTY)) |
0f8975ec | 1023 | flags2 |= __PM_SOFT_DIRTY; |
052fb0d6 | 1024 | |
0f8975ec | 1025 | *pme = make_pme(PM_PFRAME(frame) | PM_STATUS2(pm->v2, flags2) | flags); |
bcf8039e DH |
1026 | } |
1027 | ||
5aaabe83 | 1028 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
2b0a9f01 | 1029 | static void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, |
0f8975ec | 1030 | pmd_t pmd, int offset, int pmd_flags2) |
5aaabe83 | 1031 | { |
5aaabe83 NH |
1032 | /* |
1033 | * Currently pmd for thp is always present because thp can not be | |
1034 | * swapped-out, migrated, or HWPOISONed (split in such cases instead.) | |
1035 | * This if-check is just to prepare for future implementation. | |
1036 | */ | |
1037 | if (pmd_present(pmd)) | |
092b50ba | 1038 | *pme = make_pme(PM_PFRAME(pmd_pfn(pmd) + offset) |
0f8975ec | 1039 | | PM_STATUS2(pm->v2, pmd_flags2) | PM_PRESENT); |
16fbdce6 | 1040 | else |
d9104d1c | 1041 | *pme = make_pme(PM_NOT_PRESENT(pm->v2) | PM_STATUS2(pm->v2, pmd_flags2)); |
5aaabe83 NH |
1042 | } |
1043 | #else | |
2b0a9f01 | 1044 | static inline void thp_pmd_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, |
0f8975ec | 1045 | pmd_t pmd, int offset, int pmd_flags2) |
5aaabe83 | 1046 | { |
5aaabe83 NH |
1047 | } |
1048 | #endif | |
1049 | ||
85863e47 | 1050 | static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 1051 | struct mm_walk *walk) |
85863e47 | 1052 | { |
bcf8039e | 1053 | struct vm_area_struct *vma; |
2165009b | 1054 | struct pagemapread *pm = walk->private; |
bf929152 | 1055 | spinlock_t *ptl; |
85863e47 MM |
1056 | pte_t *pte; |
1057 | int err = 0; | |
1058 | ||
bcf8039e DH |
1059 | /* find the first VMA at or above 'addr' */ |
1060 | vma = find_vma(walk->mm, addr); | |
bf929152 | 1061 | if (vma && pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { |
0f8975ec PE |
1062 | int pmd_flags2; |
1063 | ||
d9104d1c CG |
1064 | if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(*pmd)) |
1065 | pmd_flags2 = __PM_SOFT_DIRTY; | |
1066 | else | |
1067 | pmd_flags2 = 0; | |
1068 | ||
025c5b24 NH |
1069 | for (; addr != end; addr += PAGE_SIZE) { |
1070 | unsigned long offset; | |
81d0fa62 | 1071 | pagemap_entry_t pme; |
025c5b24 NH |
1072 | |
1073 | offset = (addr & ~PAGEMAP_WALK_MASK) >> | |
1074 | PAGE_SHIFT; | |
0f8975ec | 1075 | thp_pmd_to_pagemap_entry(&pme, pm, *pmd, offset, pmd_flags2); |
092b50ba | 1076 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1077 | if (err) |
1078 | break; | |
5aaabe83 | 1079 | } |
bf929152 | 1080 | spin_unlock(ptl); |
025c5b24 | 1081 | return err; |
5aaabe83 NH |
1082 | } |
1083 | ||
45f83cef AA |
1084 | if (pmd_trans_unstable(pmd)) |
1085 | return 0; | |
81d0fa62 PF |
1086 | |
1087 | while (1) { | |
1088 | /* End of address space hole, which we mark as non-present. */ | |
1089 | unsigned long hole_end; | |
1090 | ||
1091 | if (vma) | |
1092 | hole_end = min(end, vma->vm_start); | |
1093 | else | |
1094 | hole_end = end; | |
1095 | ||
1096 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1097 | pagemap_entry_t pme = make_pme(PM_NOT_PRESENT(pm->v2)); | |
1098 | ||
1099 | err = add_to_pagemap(addr, &pme, pm); | |
1100 | if (err) | |
1101 | return err; | |
16fbdce6 | 1102 | } |
bcf8039e | 1103 | |
81d0fa62 PF |
1104 | if (!vma || vma->vm_start >= end) |
1105 | break; | |
1106 | /* | |
1107 | * We can't possibly be in a hugetlb VMA. In general, | |
1108 | * for a mm_walk with a pmd_entry and a hugetlb_entry, | |
1109 | * the pmd_entry can only be called on addresses in a | |
1110 | * hugetlb if the walk starts in a non-hugetlb VMA and | |
1111 | * spans a hugepage VMA. Since pagemap_read walks are | |
1112 | * PMD-sized and PMD-aligned, this will never be true. | |
1113 | */ | |
1114 | BUG_ON(is_vm_hugetlb_page(vma)); | |
1115 | ||
1116 | /* Addresses in the VMA. */ | |
1117 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { | |
1118 | pagemap_entry_t pme; | |
bcf8039e | 1119 | pte = pte_offset_map(pmd, addr); |
2b0a9f01 | 1120 | pte_to_pagemap_entry(&pme, pm, vma, addr, *pte); |
bcf8039e | 1121 | pte_unmap(pte); |
81d0fa62 PF |
1122 | err = add_to_pagemap(addr, &pme, pm); |
1123 | if (err) | |
1124 | return err; | |
bcf8039e | 1125 | } |
81d0fa62 PF |
1126 | |
1127 | if (addr == end) | |
1128 | break; | |
1129 | ||
1130 | vma = find_vma(walk->mm, addr); | |
85863e47 MM |
1131 | } |
1132 | ||
1133 | cond_resched(); | |
1134 | ||
1135 | return err; | |
1136 | } | |
1137 | ||
1a5cb814 | 1138 | #ifdef CONFIG_HUGETLB_PAGE |
2b0a9f01 | 1139 | static void huge_pte_to_pagemap_entry(pagemap_entry_t *pme, struct pagemapread *pm, |
d9104d1c | 1140 | pte_t pte, int offset, int flags2) |
5dc37642 | 1141 | { |
5dc37642 | 1142 | if (pte_present(pte)) |
d9104d1c CG |
1143 | *pme = make_pme(PM_PFRAME(pte_pfn(pte) + offset) | |
1144 | PM_STATUS2(pm->v2, flags2) | | |
1145 | PM_PRESENT); | |
16fbdce6 | 1146 | else |
d9104d1c CG |
1147 | *pme = make_pme(PM_NOT_PRESENT(pm->v2) | |
1148 | PM_STATUS2(pm->v2, flags2)); | |
5dc37642 NH |
1149 | } |
1150 | ||
116354d1 NH |
1151 | /* This function walks within one hugetlb entry in the single call */ |
1152 | static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask, | |
1153 | unsigned long addr, unsigned long end, | |
1154 | struct mm_walk *walk) | |
5dc37642 | 1155 | { |
5dc37642 | 1156 | struct pagemapread *pm = walk->private; |
d9104d1c | 1157 | struct vm_area_struct *vma; |
5dc37642 | 1158 | int err = 0; |
d9104d1c | 1159 | int flags2; |
16fbdce6 | 1160 | pagemap_entry_t pme; |
5dc37642 | 1161 | |
d9104d1c CG |
1162 | vma = find_vma(walk->mm, addr); |
1163 | WARN_ON_ONCE(!vma); | |
1164 | ||
1165 | if (vma && (vma->vm_flags & VM_SOFTDIRTY)) | |
1166 | flags2 = __PM_SOFT_DIRTY; | |
1167 | else | |
1168 | flags2 = 0; | |
1169 | ||
5dc37642 | 1170 | for (; addr != end; addr += PAGE_SIZE) { |
116354d1 | 1171 | int offset = (addr & ~hmask) >> PAGE_SHIFT; |
d9104d1c | 1172 | huge_pte_to_pagemap_entry(&pme, pm, *pte, offset, flags2); |
092b50ba | 1173 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1174 | if (err) |
1175 | return err; | |
1176 | } | |
1177 | ||
1178 | cond_resched(); | |
1179 | ||
1180 | return err; | |
1181 | } | |
1a5cb814 | 1182 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1183 | |
85863e47 MM |
1184 | /* |
1185 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1186 | * | |
f16278c6 HR |
1187 | * For each page in the address space, this file contains one 64-bit entry |
1188 | * consisting of the following: | |
1189 | * | |
052fb0d6 | 1190 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1191 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1192 | * Bits 5-54 swap offset if swapped |
f16278c6 | 1193 | * Bits 55-60 page shift (page size = 1<<page shift) |
052fb0d6 | 1194 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1195 | * Bit 62 page swapped |
1196 | * Bit 63 page present | |
1197 | * | |
1198 | * If the page is not present but in swap, then the PFN contains an | |
1199 | * encoding of the swap file number and the page's offset into the | |
1200 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1201 | * precisely which pages are mapped (or in swap) and comparing mapped |
1202 | * pages between processes. | |
1203 | * | |
1204 | * Efficient users of this interface will use /proc/pid/maps to | |
1205 | * determine which areas of memory are actually mapped and llseek to | |
1206 | * skip over unmapped regions. | |
1207 | */ | |
1208 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1209 | size_t count, loff_t *ppos) | |
1210 | { | |
496ad9aa | 1211 | struct task_struct *task = get_proc_task(file_inode(file)); |
85863e47 MM |
1212 | struct mm_struct *mm; |
1213 | struct pagemapread pm; | |
85863e47 | 1214 | int ret = -ESRCH; |
ee1e6ab6 | 1215 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1216 | unsigned long src; |
1217 | unsigned long svpfn; | |
1218 | unsigned long start_vaddr; | |
1219 | unsigned long end_vaddr; | |
d82ef020 | 1220 | int copied = 0; |
85863e47 MM |
1221 | |
1222 | if (!task) | |
1223 | goto out; | |
1224 | ||
85863e47 MM |
1225 | ret = -EINVAL; |
1226 | /* file position must be aligned */ | |
aae8679b | 1227 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
fb39380b | 1228 | goto out_task; |
85863e47 MM |
1229 | |
1230 | ret = 0; | |
08161786 VM |
1231 | if (!count) |
1232 | goto out_task; | |
1233 | ||
541c237c | 1234 | pm.v2 = soft_dirty_cleared; |
8c829622 | 1235 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
1236 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); | |
5d7e0d2b | 1237 | ret = -ENOMEM; |
d82ef020 | 1238 | if (!pm.buffer) |
98bc93e5 KM |
1239 | goto out_task; |
1240 | ||
e7dcd999 | 1241 | mm = mm_access(task, PTRACE_MODE_READ); |
98bc93e5 KM |
1242 | ret = PTR_ERR(mm); |
1243 | if (!mm || IS_ERR(mm)) | |
1244 | goto out_free; | |
85863e47 | 1245 | |
5d7e0d2b AM |
1246 | pagemap_walk.pmd_entry = pagemap_pte_range; |
1247 | pagemap_walk.pte_hole = pagemap_pte_hole; | |
1a5cb814 | 1248 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1249 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1250 | #endif |
5d7e0d2b AM |
1251 | pagemap_walk.mm = mm; |
1252 | pagemap_walk.private = ± | |
1253 | ||
1254 | src = *ppos; | |
1255 | svpfn = src / PM_ENTRY_BYTES; | |
1256 | start_vaddr = svpfn << PAGE_SHIFT; | |
1257 | end_vaddr = TASK_SIZE_OF(task); | |
1258 | ||
1259 | /* watch out for wraparound */ | |
1260 | if (svpfn > TASK_SIZE_OF(task) >> PAGE_SHIFT) | |
1261 | start_vaddr = end_vaddr; | |
1262 | ||
1263 | /* | |
1264 | * The odds are that this will stop walking way | |
1265 | * before end_vaddr, because the length of the | |
1266 | * user buffer is tracked in "pm", and the walk | |
1267 | * will stop when we hit the end of the buffer. | |
1268 | */ | |
d82ef020 KH |
1269 | ret = 0; |
1270 | while (count && (start_vaddr < end_vaddr)) { | |
1271 | int len; | |
1272 | unsigned long end; | |
1273 | ||
1274 | pm.pos = 0; | |
ea251c1d | 1275 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1276 | /* overflow ? */ |
1277 | if (end < start_vaddr || end > end_vaddr) | |
1278 | end = end_vaddr; | |
1279 | down_read(&mm->mmap_sem); | |
1280 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1281 | up_read(&mm->mmap_sem); | |
1282 | start_vaddr = end; | |
1283 | ||
1284 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1285 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1286 | ret = -EFAULT; |
98bc93e5 | 1287 | goto out_mm; |
d82ef020 KH |
1288 | } |
1289 | copied += len; | |
1290 | buf += len; | |
1291 | count -= len; | |
85863e47 | 1292 | } |
d82ef020 KH |
1293 | *ppos += copied; |
1294 | if (!ret || ret == PM_END_OF_BUFFER) | |
1295 | ret = copied; | |
1296 | ||
fb39380b MT |
1297 | out_mm: |
1298 | mmput(mm); | |
98bc93e5 KM |
1299 | out_free: |
1300 | kfree(pm.buffer); | |
85863e47 MM |
1301 | out_task: |
1302 | put_task_struct(task); | |
1303 | out: | |
1304 | return ret; | |
1305 | } | |
1306 | ||
541c237c PE |
1307 | static int pagemap_open(struct inode *inode, struct file *file) |
1308 | { | |
1309 | pr_warn_once("Bits 55-60 of /proc/PID/pagemap entries are about " | |
1310 | "to stop being page-shift some time soon. See the " | |
1311 | "linux/Documentation/vm/pagemap.txt for details.\n"); | |
1312 | return 0; | |
1313 | } | |
1314 | ||
85863e47 MM |
1315 | const struct file_operations proc_pagemap_operations = { |
1316 | .llseek = mem_lseek, /* borrow this */ | |
1317 | .read = pagemap_read, | |
541c237c | 1318 | .open = pagemap_open, |
85863e47 | 1319 | }; |
1e883281 | 1320 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1321 | |
6e21c8f1 | 1322 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1323 | |
f69ff943 SW |
1324 | struct numa_maps { |
1325 | struct vm_area_struct *vma; | |
1326 | unsigned long pages; | |
1327 | unsigned long anon; | |
1328 | unsigned long active; | |
1329 | unsigned long writeback; | |
1330 | unsigned long mapcount_max; | |
1331 | unsigned long dirty; | |
1332 | unsigned long swapcache; | |
1333 | unsigned long node[MAX_NUMNODES]; | |
1334 | }; | |
1335 | ||
5b52fc89 SW |
1336 | struct numa_maps_private { |
1337 | struct proc_maps_private proc_maps; | |
1338 | struct numa_maps md; | |
1339 | }; | |
1340 | ||
eb4866d0 DH |
1341 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1342 | unsigned long nr_pages) | |
f69ff943 SW |
1343 | { |
1344 | int count = page_mapcount(page); | |
1345 | ||
eb4866d0 | 1346 | md->pages += nr_pages; |
f69ff943 | 1347 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1348 | md->dirty += nr_pages; |
f69ff943 SW |
1349 | |
1350 | if (PageSwapCache(page)) | |
eb4866d0 | 1351 | md->swapcache += nr_pages; |
f69ff943 SW |
1352 | |
1353 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1354 | md->active += nr_pages; |
f69ff943 SW |
1355 | |
1356 | if (PageWriteback(page)) | |
eb4866d0 | 1357 | md->writeback += nr_pages; |
f69ff943 SW |
1358 | |
1359 | if (PageAnon(page)) | |
eb4866d0 | 1360 | md->anon += nr_pages; |
f69ff943 SW |
1361 | |
1362 | if (count > md->mapcount_max) | |
1363 | md->mapcount_max = count; | |
1364 | ||
eb4866d0 | 1365 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1366 | } |
1367 | ||
3200a8aa DH |
1368 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1369 | unsigned long addr) | |
1370 | { | |
1371 | struct page *page; | |
1372 | int nid; | |
1373 | ||
1374 | if (!pte_present(pte)) | |
1375 | return NULL; | |
1376 | ||
1377 | page = vm_normal_page(vma, addr, pte); | |
1378 | if (!page) | |
1379 | return NULL; | |
1380 | ||
1381 | if (PageReserved(page)) | |
1382 | return NULL; | |
1383 | ||
1384 | nid = page_to_nid(page); | |
4ff1b2c2 | 1385 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1386 | return NULL; |
1387 | ||
1388 | return page; | |
1389 | } | |
1390 | ||
f69ff943 SW |
1391 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1392 | unsigned long end, struct mm_walk *walk) | |
1393 | { | |
1394 | struct numa_maps *md; | |
1395 | spinlock_t *ptl; | |
1396 | pte_t *orig_pte; | |
1397 | pte_t *pte; | |
1398 | ||
1399 | md = walk->private; | |
025c5b24 | 1400 | |
bf929152 | 1401 | if (pmd_trans_huge_lock(pmd, md->vma, &ptl) == 1) { |
025c5b24 NH |
1402 | pte_t huge_pte = *(pte_t *)pmd; |
1403 | struct page *page; | |
1404 | ||
1405 | page = can_gather_numa_stats(huge_pte, md->vma, addr); | |
1406 | if (page) | |
1407 | gather_stats(page, md, pte_dirty(huge_pte), | |
1408 | HPAGE_PMD_SIZE/PAGE_SIZE); | |
bf929152 | 1409 | spin_unlock(ptl); |
025c5b24 | 1410 | return 0; |
32ef4384 DH |
1411 | } |
1412 | ||
1a5a9906 AA |
1413 | if (pmd_trans_unstable(pmd)) |
1414 | return 0; | |
f69ff943 SW |
1415 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1416 | do { | |
3200a8aa | 1417 | struct page *page = can_gather_numa_stats(*pte, md->vma, addr); |
f69ff943 SW |
1418 | if (!page) |
1419 | continue; | |
eb4866d0 | 1420 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1421 | |
1422 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1423 | pte_unmap_unlock(orig_pte, ptl); | |
1424 | return 0; | |
1425 | } | |
1426 | #ifdef CONFIG_HUGETLB_PAGE | |
1427 | static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask, | |
1428 | unsigned long addr, unsigned long end, struct mm_walk *walk) | |
1429 | { | |
1430 | struct numa_maps *md; | |
1431 | struct page *page; | |
1432 | ||
d4c54919 | 1433 | if (!pte_present(*pte)) |
f69ff943 SW |
1434 | return 0; |
1435 | ||
1436 | page = pte_page(*pte); | |
1437 | if (!page) | |
1438 | return 0; | |
1439 | ||
1440 | md = walk->private; | |
eb4866d0 | 1441 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1442 | return 0; |
1443 | } | |
1444 | ||
1445 | #else | |
1446 | static int gather_hugetbl_stats(pte_t *pte, unsigned long hmask, | |
1447 | unsigned long addr, unsigned long end, struct mm_walk *walk) | |
1448 | { | |
1449 | return 0; | |
1450 | } | |
1451 | #endif | |
1452 | ||
1453 | /* | |
1454 | * Display pages allocated per node and memory policy via /proc. | |
1455 | */ | |
b7643757 | 1456 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1457 | { |
5b52fc89 SW |
1458 | struct numa_maps_private *numa_priv = m->private; |
1459 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1460 | struct vm_area_struct *vma = v; |
5b52fc89 | 1461 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1462 | struct file *file = vma->vm_file; |
1463 | struct mm_struct *mm = vma->vm_mm; | |
1464 | struct mm_walk walk = {}; | |
1465 | struct mempolicy *pol; | |
948927ee DR |
1466 | char buffer[64]; |
1467 | int nid; | |
f69ff943 SW |
1468 | |
1469 | if (!mm) | |
1470 | return 0; | |
1471 | ||
5b52fc89 SW |
1472 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1473 | memset(md, 0, sizeof(*md)); | |
f69ff943 SW |
1474 | |
1475 | md->vma = vma; | |
1476 | ||
1477 | walk.hugetlb_entry = gather_hugetbl_stats; | |
1478 | walk.pmd_entry = gather_pte_stats; | |
1479 | walk.private = md; | |
1480 | walk.mm = mm; | |
1481 | ||
498f2371 ON |
1482 | pol = __get_vma_policy(vma, vma->vm_start); |
1483 | if (pol) { | |
1484 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1485 | mpol_cond_put(pol); | |
1486 | } else { | |
1487 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1488 | } | |
f69ff943 SW |
1489 | |
1490 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1491 | ||
1492 | if (file) { | |
17c2b4ee | 1493 | seq_puts(m, " file="); |
f69ff943 SW |
1494 | seq_path(m, &file->f_path, "\n\t= "); |
1495 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { | |
17c2b4ee | 1496 | seq_puts(m, " heap"); |
b7643757 | 1497 | } else { |
58cb6548 | 1498 | pid_t tid = pid_of_stack(proc_priv, vma, is_pid); |
b7643757 SP |
1499 | if (tid != 0) { |
1500 | /* | |
1501 | * Thread stack in /proc/PID/task/TID/maps or | |
1502 | * the main process stack. | |
1503 | */ | |
1504 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
1505 | vma->vm_end >= mm->start_stack)) | |
17c2b4ee | 1506 | seq_puts(m, " stack"); |
b7643757 SP |
1507 | else |
1508 | seq_printf(m, " stack:%d", tid); | |
1509 | } | |
f69ff943 SW |
1510 | } |
1511 | ||
fc360bd9 | 1512 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1513 | seq_puts(m, " huge"); |
fc360bd9 | 1514 | |
f69ff943 SW |
1515 | walk_page_range(vma->vm_start, vma->vm_end, &walk); |
1516 | ||
1517 | if (!md->pages) | |
1518 | goto out; | |
1519 | ||
1520 | if (md->anon) | |
1521 | seq_printf(m, " anon=%lu", md->anon); | |
1522 | ||
1523 | if (md->dirty) | |
1524 | seq_printf(m, " dirty=%lu", md->dirty); | |
1525 | ||
1526 | if (md->pages != md->anon && md->pages != md->dirty) | |
1527 | seq_printf(m, " mapped=%lu", md->pages); | |
1528 | ||
1529 | if (md->mapcount_max > 1) | |
1530 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1531 | ||
1532 | if (md->swapcache) | |
1533 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1534 | ||
1535 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1536 | seq_printf(m, " active=%lu", md->active); | |
1537 | ||
1538 | if (md->writeback) | |
1539 | seq_printf(m, " writeback=%lu", md->writeback); | |
1540 | ||
948927ee DR |
1541 | for_each_node_state(nid, N_MEMORY) |
1542 | if (md->node[nid]) | |
1543 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
f69ff943 SW |
1544 | out: |
1545 | seq_putc(m, '\n'); | |
b8c20a9b | 1546 | m_cache_vma(m, vma); |
f69ff943 SW |
1547 | return 0; |
1548 | } | |
5b52fc89 | 1549 | |
b7643757 SP |
1550 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1551 | { | |
1552 | return show_numa_map(m, v, 1); | |
1553 | } | |
1554 | ||
1555 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1556 | { | |
1557 | return show_numa_map(m, v, 0); | |
1558 | } | |
1559 | ||
03a44825 | 1560 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1561 | .start = m_start, |
1562 | .next = m_next, | |
1563 | .stop = m_stop, | |
1564 | .show = show_pid_numa_map, | |
6e21c8f1 | 1565 | }; |
662795de | 1566 | |
b7643757 SP |
1567 | static const struct seq_operations proc_tid_numa_maps_op = { |
1568 | .start = m_start, | |
1569 | .next = m_next, | |
1570 | .stop = m_stop, | |
1571 | .show = show_tid_numa_map, | |
1572 | }; | |
1573 | ||
1574 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1575 | const struct seq_operations *ops) | |
662795de | 1576 | { |
4db7d0ee ON |
1577 | return proc_maps_open(inode, file, ops, |
1578 | sizeof(struct numa_maps_private)); | |
662795de EB |
1579 | } |
1580 | ||
b7643757 SP |
1581 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1582 | { | |
1583 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1584 | } | |
1585 | ||
1586 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1587 | { | |
1588 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1589 | } | |
1590 | ||
1591 | const struct file_operations proc_pid_numa_maps_operations = { | |
1592 | .open = pid_numa_maps_open, | |
1593 | .read = seq_read, | |
1594 | .llseek = seq_lseek, | |
29a40ace | 1595 | .release = proc_map_release, |
b7643757 SP |
1596 | }; |
1597 | ||
1598 | const struct file_operations proc_tid_numa_maps_operations = { | |
1599 | .open = tid_numa_maps_open, | |
662795de EB |
1600 | .read = seq_read, |
1601 | .llseek = seq_lseek, | |
29a40ace | 1602 | .release = proc_map_release, |
662795de | 1603 | }; |
f69ff943 | 1604 | #endif /* CONFIG_NUMA */ |