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> |
33c3fc71 | 16 | #include <linux/page_idle.h> |
6a15a370 | 17 | #include <linux/shmem_fs.h> |
e070ad49 | 18 | |
1da177e4 LT |
19 | #include <asm/elf.h> |
20 | #include <asm/uaccess.h> | |
e070ad49 | 21 | #include <asm/tlbflush.h> |
1da177e4 LT |
22 | #include "internal.h" |
23 | ||
df5f8314 | 24 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 25 | { |
dc6c9a35 | 26 | unsigned long data, text, lib, swap, ptes, pmds; |
365e9c87 HD |
27 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
28 | ||
29 | /* | |
30 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
31 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
32 | * collector of these hiwater stats must therefore get total_vm | |
33 | * and rss too, which will usually be the higher. Barriers? not | |
34 | * worth the effort, such snapshots can always be inconsistent. | |
35 | */ | |
36 | hiwater_vm = total_vm = mm->total_vm; | |
37 | if (hiwater_vm < mm->hiwater_vm) | |
38 | hiwater_vm = mm->hiwater_vm; | |
39 | hiwater_rss = total_rss = get_mm_rss(mm); | |
40 | if (hiwater_rss < mm->hiwater_rss) | |
41 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 LT |
42 | |
43 | data = mm->total_vm - mm->shared_vm - mm->stack_vm; | |
44 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; | |
45 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 46 | swap = get_mm_counter(mm, MM_SWAPENTS); |
dc6c9a35 KS |
47 | ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); |
48 | pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); | |
df5f8314 | 49 | seq_printf(m, |
365e9c87 | 50 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
51 | "VmSize:\t%8lu kB\n" |
52 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 53 | "VmPin:\t%8lu kB\n" |
365e9c87 | 54 | "VmHWM:\t%8lu kB\n" |
1da177e4 LT |
55 | "VmRSS:\t%8lu kB\n" |
56 | "VmData:\t%8lu kB\n" | |
57 | "VmStk:\t%8lu kB\n" | |
58 | "VmExe:\t%8lu kB\n" | |
59 | "VmLib:\t%8lu kB\n" | |
b084d435 | 60 | "VmPTE:\t%8lu kB\n" |
dc6c9a35 | 61 | "VmPMD:\t%8lu kB\n" |
b084d435 | 62 | "VmSwap:\t%8lu kB\n", |
365e9c87 | 63 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 64 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 65 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 66 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
67 | hiwater_rss << (PAGE_SHIFT-10), |
68 | total_rss << (PAGE_SHIFT-10), | |
1da177e4 LT |
69 | data << (PAGE_SHIFT-10), |
70 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, | |
dc6c9a35 KS |
71 | ptes >> 10, |
72 | pmds >> 10, | |
b084d435 | 73 | swap << (PAGE_SHIFT-10)); |
5d317b2b | 74 | hugetlb_report_usage(m, mm); |
1da177e4 LT |
75 | } |
76 | ||
77 | unsigned long task_vsize(struct mm_struct *mm) | |
78 | { | |
79 | return PAGE_SIZE * mm->total_vm; | |
80 | } | |
81 | ||
a2ade7b6 AD |
82 | unsigned long task_statm(struct mm_struct *mm, |
83 | unsigned long *shared, unsigned long *text, | |
84 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 85 | { |
eca56ff9 JM |
86 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
87 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
88 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
89 | >> PAGE_SHIFT; | |
90 | *data = mm->total_vm - mm->shared_vm; | |
d559db08 | 91 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
92 | return mm->total_vm; |
93 | } | |
94 | ||
9e781440 KH |
95 | #ifdef CONFIG_NUMA |
96 | /* | |
498f2371 | 97 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
98 | */ |
99 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
100 | { | |
101 | struct task_struct *task = priv->task; | |
102 | ||
103 | task_lock(task); | |
498f2371 | 104 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
105 | mpol_get(priv->task_mempolicy); |
106 | task_unlock(task); | |
107 | } | |
108 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
109 | { | |
110 | mpol_put(priv->task_mempolicy); | |
111 | } | |
112 | #else | |
113 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
114 | { | |
115 | } | |
116 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
117 | { | |
118 | } | |
119 | #endif | |
120 | ||
59b4bf12 | 121 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 122 | { |
59b4bf12 ON |
123 | struct mm_struct *mm = priv->mm; |
124 | ||
125 | release_task_mempolicy(priv); | |
126 | up_read(&mm->mmap_sem); | |
127 | mmput(mm); | |
a6198797 | 128 | } |
ec4dd3eb | 129 | |
ad2a00e4 ON |
130 | static struct vm_area_struct * |
131 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
132 | { | |
133 | if (vma == priv->tail_vma) | |
134 | return NULL; | |
135 | return vma->vm_next ?: priv->tail_vma; | |
136 | } | |
137 | ||
b8c20a9b ON |
138 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
139 | { | |
140 | if (m->count < m->size) /* vma is copied successfully */ | |
141 | m->version = m_next_vma(m->private, vma) ? vma->vm_start : -1UL; | |
142 | } | |
143 | ||
0c255321 | 144 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 145 | { |
a6198797 | 146 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 147 | unsigned long last_addr = m->version; |
a6198797 | 148 | struct mm_struct *mm; |
0c255321 ON |
149 | struct vm_area_struct *vma; |
150 | unsigned int pos = *ppos; | |
a6198797 | 151 | |
b8c20a9b ON |
152 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
153 | if (last_addr == -1UL) | |
154 | return NULL; | |
155 | ||
2c03376d | 156 | priv->task = get_proc_task(priv->inode); |
a6198797 | 157 | if (!priv->task) |
ec6fd8a4 | 158 | return ERR_PTR(-ESRCH); |
a6198797 | 159 | |
29a40ace ON |
160 | mm = priv->mm; |
161 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) | |
162 | return NULL; | |
a6198797 | 163 | |
0c255321 | 164 | down_read(&mm->mmap_sem); |
9e781440 | 165 | hold_task_mempolicy(priv); |
0c255321 | 166 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 167 | |
b8c20a9b ON |
168 | if (last_addr) { |
169 | vma = find_vma(mm, last_addr); | |
170 | if (vma && (vma = m_next_vma(priv, vma))) | |
171 | return vma; | |
172 | } | |
173 | ||
174 | m->version = 0; | |
0c255321 | 175 | if (pos < mm->map_count) { |
557c2d8a ON |
176 | for (vma = mm->mmap; pos; pos--) { |
177 | m->version = vma->vm_start; | |
a6198797 | 178 | vma = vma->vm_next; |
557c2d8a | 179 | } |
a6198797 | 180 | return vma; |
0c255321 | 181 | } |
a6198797 | 182 | |
557c2d8a | 183 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
184 | if (pos == mm->map_count && priv->tail_vma) |
185 | return priv->tail_vma; | |
59b4bf12 ON |
186 | |
187 | vma_stop(priv); | |
188 | return NULL; | |
a6198797 MM |
189 | } |
190 | ||
191 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
192 | { | |
193 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 194 | struct vm_area_struct *next; |
a6198797 MM |
195 | |
196 | (*pos)++; | |
ad2a00e4 | 197 | next = m_next_vma(priv, v); |
59b4bf12 ON |
198 | if (!next) |
199 | vma_stop(priv); | |
200 | return next; | |
a6198797 MM |
201 | } |
202 | ||
203 | static void m_stop(struct seq_file *m, void *v) | |
204 | { | |
205 | struct proc_maps_private *priv = m->private; | |
a6198797 | 206 | |
59b4bf12 ON |
207 | if (!IS_ERR_OR_NULL(v)) |
208 | vma_stop(priv); | |
0d5f5f45 | 209 | if (priv->task) { |
a6198797 | 210 | put_task_struct(priv->task); |
0d5f5f45 ON |
211 | priv->task = NULL; |
212 | } | |
a6198797 MM |
213 | } |
214 | ||
4db7d0ee ON |
215 | static int proc_maps_open(struct inode *inode, struct file *file, |
216 | const struct seq_operations *ops, int psize) | |
217 | { | |
218 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
219 | ||
220 | if (!priv) | |
221 | return -ENOMEM; | |
222 | ||
2c03376d | 223 | priv->inode = inode; |
29a40ace ON |
224 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
225 | if (IS_ERR(priv->mm)) { | |
226 | int err = PTR_ERR(priv->mm); | |
227 | ||
228 | seq_release_private(inode, file); | |
229 | return err; | |
230 | } | |
231 | ||
4db7d0ee ON |
232 | return 0; |
233 | } | |
234 | ||
29a40ace ON |
235 | static int proc_map_release(struct inode *inode, struct file *file) |
236 | { | |
237 | struct seq_file *seq = file->private_data; | |
238 | struct proc_maps_private *priv = seq->private; | |
239 | ||
240 | if (priv->mm) | |
241 | mmdrop(priv->mm); | |
242 | ||
243 | return seq_release_private(inode, file); | |
244 | } | |
245 | ||
a6198797 | 246 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 247 | const struct seq_operations *ops) |
a6198797 | 248 | { |
4db7d0ee ON |
249 | return proc_maps_open(inode, file, ops, |
250 | sizeof(struct proc_maps_private)); | |
a6198797 | 251 | } |
e070ad49 | 252 | |
58cb6548 ON |
253 | static pid_t pid_of_stack(struct proc_maps_private *priv, |
254 | struct vm_area_struct *vma, bool is_pid) | |
255 | { | |
256 | struct inode *inode = priv->inode; | |
257 | struct task_struct *task; | |
258 | pid_t ret = 0; | |
259 | ||
260 | rcu_read_lock(); | |
261 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
262 | if (task) { | |
263 | task = task_of_stack(task, vma, is_pid); | |
264 | if (task) | |
265 | ret = task_pid_nr_ns(task, inode->i_sb->s_fs_info); | |
266 | } | |
267 | rcu_read_unlock(); | |
268 | ||
269 | return ret; | |
270 | } | |
271 | ||
b7643757 SP |
272 | static void |
273 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 274 | { |
e070ad49 ML |
275 | struct mm_struct *mm = vma->vm_mm; |
276 | struct file *file = vma->vm_file; | |
b7643757 | 277 | struct proc_maps_private *priv = m->private; |
ca16d140 | 278 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 279 | unsigned long ino = 0; |
6260a4b0 | 280 | unsigned long long pgoff = 0; |
a09a79f6 | 281 | unsigned long start, end; |
1da177e4 | 282 | dev_t dev = 0; |
b7643757 | 283 | const char *name = NULL; |
1da177e4 LT |
284 | |
285 | if (file) { | |
496ad9aa | 286 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
287 | dev = inode->i_sb->s_dev; |
288 | ino = inode->i_ino; | |
6260a4b0 | 289 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
290 | } |
291 | ||
d7824370 LT |
292 | /* We don't show the stack guard page in /proc/maps */ |
293 | start = vma->vm_start; | |
a09a79f6 MP |
294 | if (stack_guard_page_start(vma, start)) |
295 | start += PAGE_SIZE; | |
296 | end = vma->vm_end; | |
297 | if (stack_guard_page_end(vma, end)) | |
298 | end -= PAGE_SIZE; | |
d7824370 | 299 | |
652586df TH |
300 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
301 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", | |
d7824370 | 302 | start, |
a09a79f6 | 303 | end, |
1da177e4 LT |
304 | flags & VM_READ ? 'r' : '-', |
305 | flags & VM_WRITE ? 'w' : '-', | |
306 | flags & VM_EXEC ? 'x' : '-', | |
307 | flags & VM_MAYSHARE ? 's' : 'p', | |
6260a4b0 | 308 | pgoff, |
652586df | 309 | MAJOR(dev), MINOR(dev), ino); |
1da177e4 LT |
310 | |
311 | /* | |
312 | * Print the dentry name for named mappings, and a | |
313 | * special [heap] marker for the heap: | |
314 | */ | |
e070ad49 | 315 | if (file) { |
652586df | 316 | seq_pad(m, ' '); |
2726d566 | 317 | seq_file_path(m, file, "\n"); |
b7643757 SP |
318 | goto done; |
319 | } | |
320 | ||
78d683e8 AL |
321 | if (vma->vm_ops && vma->vm_ops->name) { |
322 | name = vma->vm_ops->name(vma); | |
323 | if (name) | |
324 | goto done; | |
325 | } | |
326 | ||
b7643757 SP |
327 | name = arch_vma_name(vma); |
328 | if (!name) { | |
329 | pid_t tid; | |
330 | ||
331 | if (!mm) { | |
332 | name = "[vdso]"; | |
333 | goto done; | |
334 | } | |
335 | ||
336 | if (vma->vm_start <= mm->brk && | |
337 | vma->vm_end >= mm->start_brk) { | |
338 | name = "[heap]"; | |
339 | goto done; | |
340 | } | |
341 | ||
58cb6548 | 342 | tid = pid_of_stack(priv, vma, is_pid); |
b7643757 SP |
343 | if (tid != 0) { |
344 | /* | |
345 | * Thread stack in /proc/PID/task/TID/maps or | |
346 | * the main process stack. | |
347 | */ | |
348 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
349 | vma->vm_end >= mm->start_stack)) { | |
350 | name = "[stack]"; | |
e6e5494c | 351 | } else { |
b7643757 | 352 | /* Thread stack in /proc/PID/maps */ |
652586df | 353 | seq_pad(m, ' '); |
b7643757 | 354 | seq_printf(m, "[stack:%d]", tid); |
1da177e4 | 355 | } |
e6e5494c | 356 | } |
b7643757 SP |
357 | } |
358 | ||
359 | done: | |
360 | if (name) { | |
652586df | 361 | seq_pad(m, ' '); |
b7643757 | 362 | seq_puts(m, name); |
1da177e4 LT |
363 | } |
364 | seq_putc(m, '\n'); | |
7c88db0c JK |
365 | } |
366 | ||
b7643757 | 367 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c | 368 | { |
ebb6cdde | 369 | show_map_vma(m, v, is_pid); |
b8c20a9b | 370 | m_cache_vma(m, v); |
1da177e4 LT |
371 | return 0; |
372 | } | |
373 | ||
b7643757 SP |
374 | static int show_pid_map(struct seq_file *m, void *v) |
375 | { | |
376 | return show_map(m, v, 1); | |
377 | } | |
378 | ||
379 | static int show_tid_map(struct seq_file *m, void *v) | |
380 | { | |
381 | return show_map(m, v, 0); | |
382 | } | |
383 | ||
03a44825 | 384 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
385 | .start = m_start, |
386 | .next = m_next, | |
387 | .stop = m_stop, | |
b7643757 SP |
388 | .show = show_pid_map |
389 | }; | |
390 | ||
391 | static const struct seq_operations proc_tid_maps_op = { | |
392 | .start = m_start, | |
393 | .next = m_next, | |
394 | .stop = m_stop, | |
395 | .show = show_tid_map | |
a6198797 MM |
396 | }; |
397 | ||
b7643757 | 398 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
399 | { |
400 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
401 | } | |
402 | ||
b7643757 SP |
403 | static int tid_maps_open(struct inode *inode, struct file *file) |
404 | { | |
405 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
406 | } | |
407 | ||
408 | const struct file_operations proc_pid_maps_operations = { | |
409 | .open = pid_maps_open, | |
410 | .read = seq_read, | |
411 | .llseek = seq_lseek, | |
29a40ace | 412 | .release = proc_map_release, |
b7643757 SP |
413 | }; |
414 | ||
415 | const struct file_operations proc_tid_maps_operations = { | |
416 | .open = tid_maps_open, | |
a6198797 MM |
417 | .read = seq_read, |
418 | .llseek = seq_lseek, | |
29a40ace | 419 | .release = proc_map_release, |
a6198797 MM |
420 | }; |
421 | ||
422 | /* | |
423 | * Proportional Set Size(PSS): my share of RSS. | |
424 | * | |
425 | * PSS of a process is the count of pages it has in memory, where each | |
426 | * page is divided by the number of processes sharing it. So if a | |
427 | * process has 1000 pages all to itself, and 1000 shared with one other | |
428 | * process, its PSS will be 1500. | |
429 | * | |
430 | * To keep (accumulated) division errors low, we adopt a 64bit | |
431 | * fixed-point pss counter to minimize division errors. So (pss >> | |
432 | * PSS_SHIFT) would be the real byte count. | |
433 | * | |
434 | * A shift of 12 before division means (assuming 4K page size): | |
435 | * - 1M 3-user-pages add up to 8KB errors; | |
436 | * - supports mapcount up to 2^24, or 16M; | |
437 | * - supports PSS up to 2^52 bytes, or 4PB. | |
438 | */ | |
439 | #define PSS_SHIFT 12 | |
440 | ||
1e883281 | 441 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 442 | struct mem_size_stats { |
a6198797 MM |
443 | unsigned long resident; |
444 | unsigned long shared_clean; | |
445 | unsigned long shared_dirty; | |
446 | unsigned long private_clean; | |
447 | unsigned long private_dirty; | |
448 | unsigned long referenced; | |
b40d4f84 | 449 | unsigned long anonymous; |
4031a219 | 450 | unsigned long anonymous_thp; |
214e471f | 451 | unsigned long swap; |
25ee01a2 NH |
452 | unsigned long shared_hugetlb; |
453 | unsigned long private_hugetlb; | |
a6198797 | 454 | u64 pss; |
8334b962 | 455 | u64 swap_pss; |
c261e7d9 | 456 | bool check_shmem_swap; |
a6198797 MM |
457 | }; |
458 | ||
c164e038 KS |
459 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
460 | unsigned long size, bool young, bool dirty) | |
461 | { | |
462 | int mapcount; | |
463 | ||
464 | if (PageAnon(page)) | |
465 | mss->anonymous += size; | |
466 | ||
467 | mss->resident += size; | |
468 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 469 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 KS |
470 | mss->referenced += size; |
471 | mapcount = page_mapcount(page); | |
472 | if (mapcount >= 2) { | |
473 | u64 pss_delta; | |
474 | ||
475 | if (dirty || PageDirty(page)) | |
476 | mss->shared_dirty += size; | |
477 | else | |
478 | mss->shared_clean += size; | |
479 | pss_delta = (u64)size << PSS_SHIFT; | |
480 | do_div(pss_delta, mapcount); | |
481 | mss->pss += pss_delta; | |
482 | } else { | |
483 | if (dirty || PageDirty(page)) | |
484 | mss->private_dirty += size; | |
485 | else | |
486 | mss->private_clean += size; | |
487 | mss->pss += (u64)size << PSS_SHIFT; | |
488 | } | |
489 | } | |
ae11c4d9 | 490 | |
c261e7d9 | 491 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
492 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
493 | struct mm_walk *walk) | |
494 | { | |
495 | struct mem_size_stats *mss = walk->private; | |
496 | ||
48131e03 VB |
497 | mss->swap += shmem_partial_swap_usage( |
498 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
499 | |
500 | return 0; | |
501 | } | |
c261e7d9 VB |
502 | #endif |
503 | ||
c164e038 KS |
504 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
505 | struct mm_walk *walk) | |
ae11c4d9 DH |
506 | { |
507 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 508 | struct vm_area_struct *vma = walk->vma; |
b1d4d9e0 | 509 | struct page *page = NULL; |
ae11c4d9 | 510 | |
c164e038 KS |
511 | if (pte_present(*pte)) { |
512 | page = vm_normal_page(vma, addr, *pte); | |
513 | } else if (is_swap_pte(*pte)) { | |
514 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 515 | |
8334b962 MK |
516 | if (!non_swap_entry(swpent)) { |
517 | int mapcount; | |
518 | ||
c164e038 | 519 | mss->swap += PAGE_SIZE; |
8334b962 MK |
520 | mapcount = swp_swapcount(swpent); |
521 | if (mapcount >= 2) { | |
522 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
523 | ||
524 | do_div(pss_delta, mapcount); | |
525 | mss->swap_pss += pss_delta; | |
526 | } else { | |
527 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
528 | } | |
529 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 530 | page = migration_entry_to_page(swpent); |
c261e7d9 VB |
531 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
532 | && pte_none(*pte))) { | |
48131e03 VB |
533 | page = find_get_entry(vma->vm_file->f_mapping, |
534 | linear_page_index(vma, addr)); | |
535 | if (!page) | |
536 | return; | |
537 | ||
538 | if (radix_tree_exceptional_entry(page)) | |
539 | mss->swap += PAGE_SIZE; | |
540 | else | |
541 | page_cache_release(page); | |
542 | ||
543 | return; | |
b1d4d9e0 | 544 | } |
ae11c4d9 | 545 | |
ae11c4d9 DH |
546 | if (!page) |
547 | return; | |
c164e038 | 548 | smaps_account(mss, page, PAGE_SIZE, pte_young(*pte), pte_dirty(*pte)); |
ae11c4d9 DH |
549 | } |
550 | ||
c164e038 KS |
551 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
552 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
553 | struct mm_walk *walk) | |
554 | { | |
555 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 556 | struct vm_area_struct *vma = walk->vma; |
c164e038 KS |
557 | struct page *page; |
558 | ||
559 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
560 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
561 | if (IS_ERR_OR_NULL(page)) | |
562 | return; | |
563 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
564 | smaps_account(mss, page, HPAGE_PMD_SIZE, | |
565 | pmd_young(*pmd), pmd_dirty(*pmd)); | |
566 | } | |
567 | #else | |
568 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
569 | struct mm_walk *walk) | |
570 | { | |
571 | } | |
572 | #endif | |
573 | ||
b3ae5acb | 574 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 575 | struct mm_walk *walk) |
e070ad49 | 576 | { |
14eb6fdd | 577 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 578 | pte_t *pte; |
705e87c0 | 579 | spinlock_t *ptl; |
e070ad49 | 580 | |
bf929152 | 581 | if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { |
c164e038 | 582 | smaps_pmd_entry(pmd, addr, walk); |
bf929152 | 583 | spin_unlock(ptl); |
025c5b24 | 584 | return 0; |
22e057c5 | 585 | } |
1a5a9906 AA |
586 | |
587 | if (pmd_trans_unstable(pmd)) | |
588 | return 0; | |
22e057c5 DH |
589 | /* |
590 | * The mmap_sem held all the way back in m_start() is what | |
591 | * keeps khugepaged out of here and from collapsing things | |
592 | * in here. | |
593 | */ | |
705e87c0 | 594 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 595 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 596 | smaps_pte_entry(pte, addr, walk); |
705e87c0 HD |
597 | pte_unmap_unlock(pte - 1, ptl); |
598 | cond_resched(); | |
b3ae5acb | 599 | return 0; |
e070ad49 ML |
600 | } |
601 | ||
834f82e2 CG |
602 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
603 | { | |
604 | /* | |
605 | * Don't forget to update Documentation/ on changes. | |
606 | */ | |
607 | static const char mnemonics[BITS_PER_LONG][2] = { | |
608 | /* | |
609 | * In case if we meet a flag we don't know about. | |
610 | */ | |
611 | [0 ... (BITS_PER_LONG-1)] = "??", | |
612 | ||
613 | [ilog2(VM_READ)] = "rd", | |
614 | [ilog2(VM_WRITE)] = "wr", | |
615 | [ilog2(VM_EXEC)] = "ex", | |
616 | [ilog2(VM_SHARED)] = "sh", | |
617 | [ilog2(VM_MAYREAD)] = "mr", | |
618 | [ilog2(VM_MAYWRITE)] = "mw", | |
619 | [ilog2(VM_MAYEXEC)] = "me", | |
620 | [ilog2(VM_MAYSHARE)] = "ms", | |
621 | [ilog2(VM_GROWSDOWN)] = "gd", | |
622 | [ilog2(VM_PFNMAP)] = "pf", | |
623 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
624 | #ifdef CONFIG_X86_INTEL_MPX |
625 | [ilog2(VM_MPX)] = "mp", | |
626 | #endif | |
834f82e2 CG |
627 | [ilog2(VM_LOCKED)] = "lo", |
628 | [ilog2(VM_IO)] = "io", | |
629 | [ilog2(VM_SEQ_READ)] = "sr", | |
630 | [ilog2(VM_RAND_READ)] = "rr", | |
631 | [ilog2(VM_DONTCOPY)] = "dc", | |
632 | [ilog2(VM_DONTEXPAND)] = "de", | |
633 | [ilog2(VM_ACCOUNT)] = "ac", | |
634 | [ilog2(VM_NORESERVE)] = "nr", | |
635 | [ilog2(VM_HUGETLB)] = "ht", | |
834f82e2 CG |
636 | [ilog2(VM_ARCH_1)] = "ar", |
637 | [ilog2(VM_DONTDUMP)] = "dd", | |
ec8e41ae NH |
638 | #ifdef CONFIG_MEM_SOFT_DIRTY |
639 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
640 | #endif | |
834f82e2 CG |
641 | [ilog2(VM_MIXEDMAP)] = "mm", |
642 | [ilog2(VM_HUGEPAGE)] = "hg", | |
643 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
644 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
645 | [ilog2(VM_UFFD_MISSING)]= "um", |
646 | [ilog2(VM_UFFD_WP)] = "uw", | |
834f82e2 CG |
647 | }; |
648 | size_t i; | |
649 | ||
650 | seq_puts(m, "VmFlags: "); | |
651 | for (i = 0; i < BITS_PER_LONG; i++) { | |
652 | if (vma->vm_flags & (1UL << i)) { | |
653 | seq_printf(m, "%c%c ", | |
654 | mnemonics[i][0], mnemonics[i][1]); | |
655 | } | |
656 | } | |
657 | seq_putc(m, '\n'); | |
658 | } | |
659 | ||
25ee01a2 NH |
660 | #ifdef CONFIG_HUGETLB_PAGE |
661 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
662 | unsigned long addr, unsigned long end, | |
663 | struct mm_walk *walk) | |
664 | { | |
665 | struct mem_size_stats *mss = walk->private; | |
666 | struct vm_area_struct *vma = walk->vma; | |
667 | struct page *page = NULL; | |
668 | ||
669 | if (pte_present(*pte)) { | |
670 | page = vm_normal_page(vma, addr, *pte); | |
671 | } else if (is_swap_pte(*pte)) { | |
672 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
673 | ||
674 | if (is_migration_entry(swpent)) | |
675 | page = migration_entry_to_page(swpent); | |
676 | } | |
677 | if (page) { | |
678 | int mapcount = page_mapcount(page); | |
679 | ||
680 | if (mapcount >= 2) | |
681 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
682 | else | |
683 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
684 | } | |
685 | return 0; | |
686 | } | |
687 | #endif /* HUGETLB_PAGE */ | |
688 | ||
b7643757 | 689 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 ML |
690 | { |
691 | struct vm_area_struct *vma = v; | |
e070ad49 | 692 | struct mem_size_stats mss; |
2165009b DH |
693 | struct mm_walk smaps_walk = { |
694 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
695 | #ifdef CONFIG_HUGETLB_PAGE |
696 | .hugetlb_entry = smaps_hugetlb_range, | |
697 | #endif | |
2165009b DH |
698 | .mm = vma->vm_mm, |
699 | .private = &mss, | |
700 | }; | |
e070ad49 ML |
701 | |
702 | memset(&mss, 0, sizeof mss); | |
c261e7d9 VB |
703 | |
704 | #ifdef CONFIG_SHMEM | |
705 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { | |
6a15a370 VB |
706 | /* |
707 | * For shared or readonly shmem mappings we know that all | |
708 | * swapped out pages belong to the shmem object, and we can | |
709 | * obtain the swap value much more efficiently. For private | |
710 | * writable mappings, we might have COW pages that are | |
711 | * not affected by the parent swapped out pages of the shmem | |
712 | * object, so we have to distinguish them during the page walk. | |
713 | * Unless we know that the shmem object (or the part mapped by | |
714 | * our VMA) has no swapped out pages at all. | |
715 | */ | |
716 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
717 | ||
718 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
719 | !(vma->vm_flags & VM_WRITE)) { | |
720 | mss.swap = shmem_swapped; | |
721 | } else { | |
722 | mss.check_shmem_swap = true; | |
723 | smaps_walk.pte_hole = smaps_pte_hole; | |
724 | } | |
c261e7d9 VB |
725 | } |
726 | #endif | |
727 | ||
d82ef020 | 728 | /* mmap_sem is held in m_start */ |
14eb6fdd | 729 | walk_page_vma(vma, &smaps_walk); |
4752c369 | 730 | |
b7643757 | 731 | show_map_vma(m, vma, is_pid); |
4752c369 MM |
732 | |
733 | seq_printf(m, | |
734 | "Size: %8lu kB\n" | |
735 | "Rss: %8lu kB\n" | |
736 | "Pss: %8lu kB\n" | |
737 | "Shared_Clean: %8lu kB\n" | |
738 | "Shared_Dirty: %8lu kB\n" | |
739 | "Private_Clean: %8lu kB\n" | |
740 | "Private_Dirty: %8lu kB\n" | |
214e471f | 741 | "Referenced: %8lu kB\n" |
b40d4f84 | 742 | "Anonymous: %8lu kB\n" |
4031a219 | 743 | "AnonHugePages: %8lu kB\n" |
25ee01a2 NH |
744 | "Shared_Hugetlb: %8lu kB\n" |
745 | "Private_Hugetlb: %7lu kB\n" | |
08fba699 | 746 | "Swap: %8lu kB\n" |
8334b962 | 747 | "SwapPss: %8lu kB\n" |
3340289d | 748 | "KernelPageSize: %8lu kB\n" |
2d90508f NK |
749 | "MMUPageSize: %8lu kB\n" |
750 | "Locked: %8lu kB\n", | |
4752c369 MM |
751 | (vma->vm_end - vma->vm_start) >> 10, |
752 | mss.resident >> 10, | |
753 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)), | |
754 | mss.shared_clean >> 10, | |
755 | mss.shared_dirty >> 10, | |
756 | mss.private_clean >> 10, | |
757 | mss.private_dirty >> 10, | |
214e471f | 758 | mss.referenced >> 10, |
b40d4f84 | 759 | mss.anonymous >> 10, |
4031a219 | 760 | mss.anonymous_thp >> 10, |
25ee01a2 NH |
761 | mss.shared_hugetlb >> 10, |
762 | mss.private_hugetlb >> 10, | |
08fba699 | 763 | mss.swap >> 10, |
8334b962 | 764 | (unsigned long)(mss.swap_pss >> (10 + PSS_SHIFT)), |
3340289d | 765 | vma_kernel_pagesize(vma) >> 10, |
2d90508f NK |
766 | vma_mmu_pagesize(vma) >> 10, |
767 | (vma->vm_flags & VM_LOCKED) ? | |
768 | (unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0); | |
4752c369 | 769 | |
834f82e2 | 770 | show_smap_vma_flags(m, vma); |
b8c20a9b | 771 | m_cache_vma(m, vma); |
7c88db0c | 772 | return 0; |
e070ad49 ML |
773 | } |
774 | ||
b7643757 SP |
775 | static int show_pid_smap(struct seq_file *m, void *v) |
776 | { | |
777 | return show_smap(m, v, 1); | |
778 | } | |
779 | ||
780 | static int show_tid_smap(struct seq_file *m, void *v) | |
781 | { | |
782 | return show_smap(m, v, 0); | |
783 | } | |
784 | ||
03a44825 | 785 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
786 | .start = m_start, |
787 | .next = m_next, | |
788 | .stop = m_stop, | |
b7643757 SP |
789 | .show = show_pid_smap |
790 | }; | |
791 | ||
792 | static const struct seq_operations proc_tid_smaps_op = { | |
793 | .start = m_start, | |
794 | .next = m_next, | |
795 | .stop = m_stop, | |
796 | .show = show_tid_smap | |
a6198797 MM |
797 | }; |
798 | ||
b7643757 | 799 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
800 | { |
801 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
802 | } | |
803 | ||
b7643757 SP |
804 | static int tid_smaps_open(struct inode *inode, struct file *file) |
805 | { | |
806 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
807 | } | |
808 | ||
809 | const struct file_operations proc_pid_smaps_operations = { | |
810 | .open = pid_smaps_open, | |
811 | .read = seq_read, | |
812 | .llseek = seq_lseek, | |
29a40ace | 813 | .release = proc_map_release, |
b7643757 SP |
814 | }; |
815 | ||
816 | const struct file_operations proc_tid_smaps_operations = { | |
817 | .open = tid_smaps_open, | |
a6198797 MM |
818 | .read = seq_read, |
819 | .llseek = seq_lseek, | |
29a40ace | 820 | .release = proc_map_release, |
a6198797 MM |
821 | }; |
822 | ||
040fa020 PE |
823 | enum clear_refs_types { |
824 | CLEAR_REFS_ALL = 1, | |
825 | CLEAR_REFS_ANON, | |
826 | CLEAR_REFS_MAPPED, | |
0f8975ec | 827 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 828 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
829 | CLEAR_REFS_LAST, |
830 | }; | |
831 | ||
af9de7eb | 832 | struct clear_refs_private { |
0f8975ec | 833 | enum clear_refs_types type; |
af9de7eb PE |
834 | }; |
835 | ||
7d5b3bfa | 836 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
837 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
838 | unsigned long addr, pte_t *pte) | |
839 | { | |
0f8975ec PE |
840 | /* |
841 | * The soft-dirty tracker uses #PF-s to catch writes | |
842 | * to pages, so write-protect the pte as well. See the | |
843 | * Documentation/vm/soft-dirty.txt for full description | |
844 | * of how soft-dirty works. | |
845 | */ | |
846 | pte_t ptent = *pte; | |
179ef71c CG |
847 | |
848 | if (pte_present(ptent)) { | |
326c2597 | 849 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
179ef71c | 850 | ptent = pte_wrprotect(ptent); |
a7b76174 | 851 | ptent = pte_clear_soft_dirty(ptent); |
326c2597 | 852 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
179ef71c CG |
853 | } else if (is_swap_pte(ptent)) { |
854 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 855 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 856 | } |
0f8975ec | 857 | } |
5d3875a0 LD |
858 | #else |
859 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
860 | unsigned long addr, pte_t *pte) | |
861 | { | |
862 | } | |
863 | #endif | |
0f8975ec | 864 | |
5d3875a0 | 865 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
866 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
867 | unsigned long addr, pmd_t *pmdp) | |
868 | { | |
326c2597 | 869 | pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp); |
7d5b3bfa KS |
870 | |
871 | pmd = pmd_wrprotect(pmd); | |
a7b76174 | 872 | pmd = pmd_clear_soft_dirty(pmd); |
7d5b3bfa KS |
873 | |
874 | if (vma->vm_flags & VM_SOFTDIRTY) | |
875 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
876 | ||
877 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
878 | } | |
7d5b3bfa | 879 | #else |
7d5b3bfa KS |
880 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
881 | unsigned long addr, pmd_t *pmdp) | |
882 | { | |
883 | } | |
884 | #endif | |
885 | ||
a6198797 | 886 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 887 | unsigned long end, struct mm_walk *walk) |
a6198797 | 888 | { |
af9de7eb | 889 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 890 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
891 | pte_t *pte, ptent; |
892 | spinlock_t *ptl; | |
893 | struct page *page; | |
894 | ||
7d5b3bfa KS |
895 | if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { |
896 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { | |
897 | clear_soft_dirty_pmd(vma, addr, pmd); | |
898 | goto out; | |
899 | } | |
900 | ||
901 | page = pmd_page(*pmd); | |
902 | ||
903 | /* Clear accessed and referenced bits. */ | |
904 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 905 | test_and_clear_page_young(page); |
7d5b3bfa KS |
906 | ClearPageReferenced(page); |
907 | out: | |
908 | spin_unlock(ptl); | |
909 | return 0; | |
910 | } | |
911 | ||
1a5a9906 AA |
912 | if (pmd_trans_unstable(pmd)) |
913 | return 0; | |
03319327 | 914 | |
a6198797 MM |
915 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
916 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
917 | ptent = *pte; | |
a6198797 | 918 | |
0f8975ec PE |
919 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
920 | clear_soft_dirty(vma, addr, pte); | |
921 | continue; | |
922 | } | |
923 | ||
179ef71c CG |
924 | if (!pte_present(ptent)) |
925 | continue; | |
926 | ||
a6198797 MM |
927 | page = vm_normal_page(vma, addr, ptent); |
928 | if (!page) | |
929 | continue; | |
930 | ||
931 | /* Clear accessed and referenced bits. */ | |
932 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 933 | test_and_clear_page_young(page); |
a6198797 MM |
934 | ClearPageReferenced(page); |
935 | } | |
936 | pte_unmap_unlock(pte - 1, ptl); | |
937 | cond_resched(); | |
938 | return 0; | |
939 | } | |
940 | ||
5c64f52a NH |
941 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
942 | struct mm_walk *walk) | |
943 | { | |
944 | struct clear_refs_private *cp = walk->private; | |
945 | struct vm_area_struct *vma = walk->vma; | |
946 | ||
48684a65 NH |
947 | if (vma->vm_flags & VM_PFNMAP) |
948 | return 1; | |
949 | ||
5c64f52a NH |
950 | /* |
951 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
952 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
953 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
954 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
955 | */ | |
956 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
957 | return 1; | |
958 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
959 | return 1; | |
960 | return 0; | |
961 | } | |
962 | ||
f248dcb3 MM |
963 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
964 | size_t count, loff_t *ppos) | |
b813e931 | 965 | { |
f248dcb3 | 966 | struct task_struct *task; |
fb92a4b0 | 967 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 968 | struct mm_struct *mm; |
b813e931 | 969 | struct vm_area_struct *vma; |
040fa020 PE |
970 | enum clear_refs_types type; |
971 | int itype; | |
0a8cb8e3 | 972 | int rv; |
b813e931 | 973 | |
f248dcb3 MM |
974 | memset(buffer, 0, sizeof(buffer)); |
975 | if (count > sizeof(buffer) - 1) | |
976 | count = sizeof(buffer) - 1; | |
977 | if (copy_from_user(buffer, buf, count)) | |
978 | return -EFAULT; | |
040fa020 | 979 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
980 | if (rv < 0) |
981 | return rv; | |
040fa020 PE |
982 | type = (enum clear_refs_types)itype; |
983 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 984 | return -EINVAL; |
541c237c | 985 | |
496ad9aa | 986 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
987 | if (!task) |
988 | return -ESRCH; | |
989 | mm = get_task_mm(task); | |
990 | if (mm) { | |
af9de7eb | 991 | struct clear_refs_private cp = { |
0f8975ec | 992 | .type = type, |
af9de7eb | 993 | }; |
20cbc972 AM |
994 | struct mm_walk clear_refs_walk = { |
995 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 996 | .test_walk = clear_refs_test_walk, |
20cbc972 | 997 | .mm = mm, |
af9de7eb | 998 | .private = &cp, |
20cbc972 | 999 | }; |
695f0559 PC |
1000 | |
1001 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
1002 | /* | |
1003 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1004 | * resident set size to this mm's current rss value. | |
1005 | */ | |
1006 | down_write(&mm->mmap_sem); | |
1007 | reset_mm_hiwater_rss(mm); | |
1008 | up_write(&mm->mmap_sem); | |
1009 | goto out_mm; | |
1010 | } | |
1011 | ||
f248dcb3 | 1012 | down_read(&mm->mmap_sem); |
64e45507 PF |
1013 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1014 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1015 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1016 | continue; | |
1017 | up_read(&mm->mmap_sem); | |
1018 | down_write(&mm->mmap_sem); | |
1019 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1020 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1021 | vma_set_page_prot(vma); | |
1022 | } | |
1023 | downgrade_write(&mm->mmap_sem); | |
1024 | break; | |
1025 | } | |
0f8975ec | 1026 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 1027 | } |
5c64f52a | 1028 | walk_page_range(0, ~0UL, &clear_refs_walk); |
0f8975ec PE |
1029 | if (type == CLEAR_REFS_SOFT_DIRTY) |
1030 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
f248dcb3 MM |
1031 | flush_tlb_mm(mm); |
1032 | up_read(&mm->mmap_sem); | |
695f0559 | 1033 | out_mm: |
f248dcb3 MM |
1034 | mmput(mm); |
1035 | } | |
1036 | put_task_struct(task); | |
fb92a4b0 VL |
1037 | |
1038 | return count; | |
b813e931 DR |
1039 | } |
1040 | ||
f248dcb3 MM |
1041 | const struct file_operations proc_clear_refs_operations = { |
1042 | .write = clear_refs_write, | |
6038f373 | 1043 | .llseek = noop_llseek, |
f248dcb3 MM |
1044 | }; |
1045 | ||
092b50ba NH |
1046 | typedef struct { |
1047 | u64 pme; | |
1048 | } pagemap_entry_t; | |
1049 | ||
85863e47 | 1050 | struct pagemapread { |
8c829622 | 1051 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1052 | pagemap_entry_t *buffer; |
1c90308e | 1053 | bool show_pfn; |
85863e47 MM |
1054 | }; |
1055 | ||
5aaabe83 NH |
1056 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1057 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1058 | ||
deb94544 KK |
1059 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1060 | #define PM_PFRAME_BITS 55 | |
1061 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1062 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1063 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1064 | #define PM_FILE BIT_ULL(61) |
1065 | #define PM_SWAP BIT_ULL(62) | |
1066 | #define PM_PRESENT BIT_ULL(63) | |
1067 | ||
85863e47 MM |
1068 | #define PM_END_OF_BUFFER 1 |
1069 | ||
deb94544 | 1070 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1071 | { |
deb94544 | 1072 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1073 | } |
1074 | ||
1075 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1076 | struct pagemapread *pm) |
1077 | { | |
092b50ba | 1078 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1079 | if (pm->pos >= pm->len) |
aae8679b | 1080 | return PM_END_OF_BUFFER; |
85863e47 MM |
1081 | return 0; |
1082 | } | |
1083 | ||
1084 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1085 | struct mm_walk *walk) |
85863e47 | 1086 | { |
2165009b | 1087 | struct pagemapread *pm = walk->private; |
68b5a652 | 1088 | unsigned long addr = start; |
85863e47 | 1089 | int err = 0; |
092b50ba | 1090 | |
68b5a652 PF |
1091 | while (addr < end) { |
1092 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1093 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1094 | /* End of address space hole, which we mark as non-present. */ |
1095 | unsigned long hole_end; | |
68b5a652 | 1096 | |
87e6d49a PF |
1097 | if (vma) |
1098 | hole_end = min(end, vma->vm_start); | |
1099 | else | |
1100 | hole_end = end; | |
1101 | ||
1102 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1103 | err = add_to_pagemap(addr, &pme, pm); | |
1104 | if (err) | |
1105 | goto out; | |
68b5a652 PF |
1106 | } |
1107 | ||
87e6d49a PF |
1108 | if (!vma) |
1109 | break; | |
1110 | ||
1111 | /* Addresses in the VMA. */ | |
1112 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1113 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1114 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1115 | err = add_to_pagemap(addr, &pme, pm); |
1116 | if (err) | |
1117 | goto out; | |
1118 | } | |
85863e47 | 1119 | } |
68b5a652 | 1120 | out: |
85863e47 MM |
1121 | return err; |
1122 | } | |
1123 | ||
deb94544 | 1124 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1125 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1126 | { |
deb94544 | 1127 | u64 frame = 0, flags = 0; |
052fb0d6 | 1128 | struct page *page = NULL; |
85863e47 | 1129 | |
052fb0d6 | 1130 | if (pte_present(pte)) { |
1c90308e KK |
1131 | if (pm->show_pfn) |
1132 | frame = pte_pfn(pte); | |
deb94544 | 1133 | flags |= PM_PRESENT; |
052fb0d6 | 1134 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1135 | if (pte_soft_dirty(pte)) |
deb94544 | 1136 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1137 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1138 | swp_entry_t entry; |
1139 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1140 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1141 | entry = pte_to_swp_entry(pte); |
052fb0d6 KK |
1142 | frame = swp_type(entry) | |
1143 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1144 | flags |= PM_SWAP; |
052fb0d6 KK |
1145 | if (is_migration_entry(entry)) |
1146 | page = migration_entry_to_page(entry); | |
052fb0d6 KK |
1147 | } |
1148 | ||
1149 | if (page && !PageAnon(page)) | |
1150 | flags |= PM_FILE; | |
77bb499b KK |
1151 | if (page && page_mapcount(page) == 1) |
1152 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1153 | if (vma->vm_flags & VM_SOFTDIRTY) |
1154 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1155 | |
deb94544 | 1156 | return make_pme(frame, flags); |
bcf8039e DH |
1157 | } |
1158 | ||
356515e7 | 1159 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1160 | struct mm_walk *walk) |
85863e47 | 1161 | { |
f995ece2 | 1162 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1163 | struct pagemapread *pm = walk->private; |
bf929152 | 1164 | spinlock_t *ptl; |
05fbf357 | 1165 | pte_t *pte, *orig_pte; |
85863e47 MM |
1166 | int err = 0; |
1167 | ||
356515e7 KK |
1168 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1169 | if (pmd_trans_huge_lock(pmdp, vma, &ptl) == 1) { | |
1170 | u64 flags = 0, frame = 0; | |
1171 | pmd_t pmd = *pmdp; | |
0f8975ec | 1172 | |
356515e7 | 1173 | if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd)) |
deb94544 | 1174 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1175 | |
356515e7 KK |
1176 | /* |
1177 | * Currently pmd for thp is always present because thp | |
1178 | * can not be swapped-out, migrated, or HWPOISONed | |
1179 | * (split in such cases instead.) | |
1180 | * This if-check is just to prepare for future implementation. | |
1181 | */ | |
1182 | if (pmd_present(pmd)) { | |
77bb499b KK |
1183 | struct page *page = pmd_page(pmd); |
1184 | ||
1185 | if (page_mapcount(page) == 1) | |
1186 | flags |= PM_MMAP_EXCLUSIVE; | |
1187 | ||
356515e7 | 1188 | flags |= PM_PRESENT; |
1c90308e KK |
1189 | if (pm->show_pfn) |
1190 | frame = pmd_pfn(pmd) + | |
1191 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 KK |
1192 | } |
1193 | ||
025c5b24 | 1194 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1195 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1196 | |
092b50ba | 1197 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1198 | if (err) |
1199 | break; | |
1c90308e | 1200 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1201 | frame++; |
5aaabe83 | 1202 | } |
bf929152 | 1203 | spin_unlock(ptl); |
025c5b24 | 1204 | return err; |
5aaabe83 NH |
1205 | } |
1206 | ||
356515e7 | 1207 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1208 | return 0; |
356515e7 | 1209 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1210 | |
f995ece2 NH |
1211 | /* |
1212 | * We can assume that @vma always points to a valid one and @end never | |
1213 | * goes beyond vma->vm_end. | |
1214 | */ | |
356515e7 | 1215 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1216 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1217 | pagemap_entry_t pme; | |
05fbf357 | 1218 | |
deb94544 | 1219 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1220 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1221 | if (err) |
81d0fa62 | 1222 | break; |
85863e47 | 1223 | } |
f995ece2 | 1224 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1225 | |
1226 | cond_resched(); | |
1227 | ||
1228 | return err; | |
1229 | } | |
1230 | ||
1a5cb814 | 1231 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1232 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1233 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1234 | unsigned long addr, unsigned long end, |
1235 | struct mm_walk *walk) | |
5dc37642 | 1236 | { |
5dc37642 | 1237 | struct pagemapread *pm = walk->private; |
f995ece2 | 1238 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1239 | u64 flags = 0, frame = 0; |
5dc37642 | 1240 | int err = 0; |
356515e7 | 1241 | pte_t pte; |
5dc37642 | 1242 | |
f995ece2 | 1243 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1244 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1245 | |
356515e7 KK |
1246 | pte = huge_ptep_get(ptep); |
1247 | if (pte_present(pte)) { | |
1248 | struct page *page = pte_page(pte); | |
1249 | ||
1250 | if (!PageAnon(page)) | |
1251 | flags |= PM_FILE; | |
1252 | ||
77bb499b KK |
1253 | if (page_mapcount(page) == 1) |
1254 | flags |= PM_MMAP_EXCLUSIVE; | |
1255 | ||
356515e7 | 1256 | flags |= PM_PRESENT; |
1c90308e KK |
1257 | if (pm->show_pfn) |
1258 | frame = pte_pfn(pte) + | |
1259 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1260 | } |
1261 | ||
5dc37642 | 1262 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1263 | pagemap_entry_t pme = make_pme(frame, flags); |
1264 | ||
092b50ba | 1265 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1266 | if (err) |
1267 | return err; | |
1c90308e | 1268 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1269 | frame++; |
5dc37642 NH |
1270 | } |
1271 | ||
1272 | cond_resched(); | |
1273 | ||
1274 | return err; | |
1275 | } | |
1a5cb814 | 1276 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1277 | |
85863e47 MM |
1278 | /* |
1279 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1280 | * | |
f16278c6 HR |
1281 | * For each page in the address space, this file contains one 64-bit entry |
1282 | * consisting of the following: | |
1283 | * | |
052fb0d6 | 1284 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1285 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1286 | * Bits 5-54 swap offset if swapped |
deb94544 | 1287 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
77bb499b KK |
1288 | * Bit 56 page exclusively mapped |
1289 | * Bits 57-60 zero | |
052fb0d6 | 1290 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1291 | * Bit 62 page swapped |
1292 | * Bit 63 page present | |
1293 | * | |
1294 | * If the page is not present but in swap, then the PFN contains an | |
1295 | * encoding of the swap file number and the page's offset into the | |
1296 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1297 | * precisely which pages are mapped (or in swap) and comparing mapped |
1298 | * pages between processes. | |
1299 | * | |
1300 | * Efficient users of this interface will use /proc/pid/maps to | |
1301 | * determine which areas of memory are actually mapped and llseek to | |
1302 | * skip over unmapped regions. | |
1303 | */ | |
1304 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1305 | size_t count, loff_t *ppos) | |
1306 | { | |
a06db751 | 1307 | struct mm_struct *mm = file->private_data; |
85863e47 | 1308 | struct pagemapread pm; |
ee1e6ab6 | 1309 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1310 | unsigned long src; |
1311 | unsigned long svpfn; | |
1312 | unsigned long start_vaddr; | |
1313 | unsigned long end_vaddr; | |
a06db751 | 1314 | int ret = 0, copied = 0; |
85863e47 | 1315 | |
a06db751 | 1316 | if (!mm || !atomic_inc_not_zero(&mm->mm_users)) |
85863e47 MM |
1317 | goto out; |
1318 | ||
85863e47 MM |
1319 | ret = -EINVAL; |
1320 | /* file position must be aligned */ | |
aae8679b | 1321 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1322 | goto out_mm; |
85863e47 MM |
1323 | |
1324 | ret = 0; | |
08161786 | 1325 | if (!count) |
a06db751 | 1326 | goto out_mm; |
08161786 | 1327 | |
1c90308e KK |
1328 | /* do not disclose physical addresses: attack vector */ |
1329 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1330 | ||
8c829622 | 1331 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
1332 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); | |
5d7e0d2b | 1333 | ret = -ENOMEM; |
d82ef020 | 1334 | if (!pm.buffer) |
a06db751 | 1335 | goto out_mm; |
85863e47 | 1336 | |
356515e7 | 1337 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1338 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1339 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1340 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1341 | #endif |
5d7e0d2b AM |
1342 | pagemap_walk.mm = mm; |
1343 | pagemap_walk.private = ± | |
1344 | ||
1345 | src = *ppos; | |
1346 | svpfn = src / PM_ENTRY_BYTES; | |
1347 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1348 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1349 | |
1350 | /* watch out for wraparound */ | |
a06db751 | 1351 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1352 | start_vaddr = end_vaddr; |
1353 | ||
1354 | /* | |
1355 | * The odds are that this will stop walking way | |
1356 | * before end_vaddr, because the length of the | |
1357 | * user buffer is tracked in "pm", and the walk | |
1358 | * will stop when we hit the end of the buffer. | |
1359 | */ | |
d82ef020 KH |
1360 | ret = 0; |
1361 | while (count && (start_vaddr < end_vaddr)) { | |
1362 | int len; | |
1363 | unsigned long end; | |
1364 | ||
1365 | pm.pos = 0; | |
ea251c1d | 1366 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1367 | /* overflow ? */ |
1368 | if (end < start_vaddr || end > end_vaddr) | |
1369 | end = end_vaddr; | |
1370 | down_read(&mm->mmap_sem); | |
1371 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1372 | up_read(&mm->mmap_sem); | |
1373 | start_vaddr = end; | |
1374 | ||
1375 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1376 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1377 | ret = -EFAULT; |
a06db751 | 1378 | goto out_free; |
d82ef020 KH |
1379 | } |
1380 | copied += len; | |
1381 | buf += len; | |
1382 | count -= len; | |
85863e47 | 1383 | } |
d82ef020 KH |
1384 | *ppos += copied; |
1385 | if (!ret || ret == PM_END_OF_BUFFER) | |
1386 | ret = copied; | |
1387 | ||
98bc93e5 KM |
1388 | out_free: |
1389 | kfree(pm.buffer); | |
a06db751 KK |
1390 | out_mm: |
1391 | mmput(mm); | |
85863e47 MM |
1392 | out: |
1393 | return ret; | |
1394 | } | |
1395 | ||
541c237c PE |
1396 | static int pagemap_open(struct inode *inode, struct file *file) |
1397 | { | |
a06db751 KK |
1398 | struct mm_struct *mm; |
1399 | ||
a06db751 KK |
1400 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1401 | if (IS_ERR(mm)) | |
1402 | return PTR_ERR(mm); | |
1403 | file->private_data = mm; | |
1404 | return 0; | |
1405 | } | |
1406 | ||
1407 | static int pagemap_release(struct inode *inode, struct file *file) | |
1408 | { | |
1409 | struct mm_struct *mm = file->private_data; | |
1410 | ||
1411 | if (mm) | |
1412 | mmdrop(mm); | |
541c237c PE |
1413 | return 0; |
1414 | } | |
1415 | ||
85863e47 MM |
1416 | const struct file_operations proc_pagemap_operations = { |
1417 | .llseek = mem_lseek, /* borrow this */ | |
1418 | .read = pagemap_read, | |
541c237c | 1419 | .open = pagemap_open, |
a06db751 | 1420 | .release = pagemap_release, |
85863e47 | 1421 | }; |
1e883281 | 1422 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1423 | |
6e21c8f1 | 1424 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1425 | |
f69ff943 | 1426 | struct numa_maps { |
f69ff943 SW |
1427 | unsigned long pages; |
1428 | unsigned long anon; | |
1429 | unsigned long active; | |
1430 | unsigned long writeback; | |
1431 | unsigned long mapcount_max; | |
1432 | unsigned long dirty; | |
1433 | unsigned long swapcache; | |
1434 | unsigned long node[MAX_NUMNODES]; | |
1435 | }; | |
1436 | ||
5b52fc89 SW |
1437 | struct numa_maps_private { |
1438 | struct proc_maps_private proc_maps; | |
1439 | struct numa_maps md; | |
1440 | }; | |
1441 | ||
eb4866d0 DH |
1442 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1443 | unsigned long nr_pages) | |
f69ff943 SW |
1444 | { |
1445 | int count = page_mapcount(page); | |
1446 | ||
eb4866d0 | 1447 | md->pages += nr_pages; |
f69ff943 | 1448 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1449 | md->dirty += nr_pages; |
f69ff943 SW |
1450 | |
1451 | if (PageSwapCache(page)) | |
eb4866d0 | 1452 | md->swapcache += nr_pages; |
f69ff943 SW |
1453 | |
1454 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1455 | md->active += nr_pages; |
f69ff943 SW |
1456 | |
1457 | if (PageWriteback(page)) | |
eb4866d0 | 1458 | md->writeback += nr_pages; |
f69ff943 SW |
1459 | |
1460 | if (PageAnon(page)) | |
eb4866d0 | 1461 | md->anon += nr_pages; |
f69ff943 SW |
1462 | |
1463 | if (count > md->mapcount_max) | |
1464 | md->mapcount_max = count; | |
1465 | ||
eb4866d0 | 1466 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1467 | } |
1468 | ||
3200a8aa DH |
1469 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1470 | unsigned long addr) | |
1471 | { | |
1472 | struct page *page; | |
1473 | int nid; | |
1474 | ||
1475 | if (!pte_present(pte)) | |
1476 | return NULL; | |
1477 | ||
1478 | page = vm_normal_page(vma, addr, pte); | |
1479 | if (!page) | |
1480 | return NULL; | |
1481 | ||
1482 | if (PageReserved(page)) | |
1483 | return NULL; | |
1484 | ||
1485 | nid = page_to_nid(page); | |
4ff1b2c2 | 1486 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1487 | return NULL; |
1488 | ||
1489 | return page; | |
1490 | } | |
1491 | ||
f69ff943 SW |
1492 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1493 | unsigned long end, struct mm_walk *walk) | |
1494 | { | |
d85f4d6d NH |
1495 | struct numa_maps *md = walk->private; |
1496 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1497 | spinlock_t *ptl; |
1498 | pte_t *orig_pte; | |
1499 | pte_t *pte; | |
1500 | ||
d85f4d6d | 1501 | if (pmd_trans_huge_lock(pmd, vma, &ptl) == 1) { |
025c5b24 NH |
1502 | pte_t huge_pte = *(pte_t *)pmd; |
1503 | struct page *page; | |
1504 | ||
d85f4d6d | 1505 | page = can_gather_numa_stats(huge_pte, vma, addr); |
025c5b24 NH |
1506 | if (page) |
1507 | gather_stats(page, md, pte_dirty(huge_pte), | |
1508 | HPAGE_PMD_SIZE/PAGE_SIZE); | |
bf929152 | 1509 | spin_unlock(ptl); |
025c5b24 | 1510 | return 0; |
32ef4384 DH |
1511 | } |
1512 | ||
1a5a9906 AA |
1513 | if (pmd_trans_unstable(pmd)) |
1514 | return 0; | |
f69ff943 SW |
1515 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1516 | do { | |
d85f4d6d | 1517 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1518 | if (!page) |
1519 | continue; | |
eb4866d0 | 1520 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1521 | |
1522 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1523 | pte_unmap_unlock(orig_pte, ptl); | |
1524 | return 0; | |
1525 | } | |
1526 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1527 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1528 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1529 | { | |
1530 | struct numa_maps *md; | |
1531 | struct page *page; | |
1532 | ||
d4c54919 | 1533 | if (!pte_present(*pte)) |
f69ff943 SW |
1534 | return 0; |
1535 | ||
1536 | page = pte_page(*pte); | |
1537 | if (!page) | |
1538 | return 0; | |
1539 | ||
1540 | md = walk->private; | |
eb4866d0 | 1541 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1542 | return 0; |
1543 | } | |
1544 | ||
1545 | #else | |
632fd60f | 1546 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1547 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1548 | { | |
1549 | return 0; | |
1550 | } | |
1551 | #endif | |
1552 | ||
1553 | /* | |
1554 | * Display pages allocated per node and memory policy via /proc. | |
1555 | */ | |
b7643757 | 1556 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1557 | { |
5b52fc89 SW |
1558 | struct numa_maps_private *numa_priv = m->private; |
1559 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1560 | struct vm_area_struct *vma = v; |
5b52fc89 | 1561 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1562 | struct file *file = vma->vm_file; |
1563 | struct mm_struct *mm = vma->vm_mm; | |
d85f4d6d NH |
1564 | struct mm_walk walk = { |
1565 | .hugetlb_entry = gather_hugetlb_stats, | |
1566 | .pmd_entry = gather_pte_stats, | |
1567 | .private = md, | |
1568 | .mm = mm, | |
1569 | }; | |
f69ff943 | 1570 | struct mempolicy *pol; |
948927ee DR |
1571 | char buffer[64]; |
1572 | int nid; | |
f69ff943 SW |
1573 | |
1574 | if (!mm) | |
1575 | return 0; | |
1576 | ||
5b52fc89 SW |
1577 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1578 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1579 | |
498f2371 ON |
1580 | pol = __get_vma_policy(vma, vma->vm_start); |
1581 | if (pol) { | |
1582 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1583 | mpol_cond_put(pol); | |
1584 | } else { | |
1585 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1586 | } | |
f69ff943 SW |
1587 | |
1588 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1589 | ||
1590 | if (file) { | |
17c2b4ee | 1591 | seq_puts(m, " file="); |
2726d566 | 1592 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1593 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1594 | seq_puts(m, " heap"); |
b7643757 | 1595 | } else { |
58cb6548 | 1596 | pid_t tid = pid_of_stack(proc_priv, vma, is_pid); |
b7643757 SP |
1597 | if (tid != 0) { |
1598 | /* | |
1599 | * Thread stack in /proc/PID/task/TID/maps or | |
1600 | * the main process stack. | |
1601 | */ | |
1602 | if (!is_pid || (vma->vm_start <= mm->start_stack && | |
1603 | vma->vm_end >= mm->start_stack)) | |
17c2b4ee | 1604 | seq_puts(m, " stack"); |
b7643757 SP |
1605 | else |
1606 | seq_printf(m, " stack:%d", tid); | |
1607 | } | |
f69ff943 SW |
1608 | } |
1609 | ||
fc360bd9 | 1610 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1611 | seq_puts(m, " huge"); |
fc360bd9 | 1612 | |
d85f4d6d NH |
1613 | /* mmap_sem is held by m_start */ |
1614 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1615 | |
1616 | if (!md->pages) | |
1617 | goto out; | |
1618 | ||
1619 | if (md->anon) | |
1620 | seq_printf(m, " anon=%lu", md->anon); | |
1621 | ||
1622 | if (md->dirty) | |
1623 | seq_printf(m, " dirty=%lu", md->dirty); | |
1624 | ||
1625 | if (md->pages != md->anon && md->pages != md->dirty) | |
1626 | seq_printf(m, " mapped=%lu", md->pages); | |
1627 | ||
1628 | if (md->mapcount_max > 1) | |
1629 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1630 | ||
1631 | if (md->swapcache) | |
1632 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1633 | ||
1634 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1635 | seq_printf(m, " active=%lu", md->active); | |
1636 | ||
1637 | if (md->writeback) | |
1638 | seq_printf(m, " writeback=%lu", md->writeback); | |
1639 | ||
948927ee DR |
1640 | for_each_node_state(nid, N_MEMORY) |
1641 | if (md->node[nid]) | |
1642 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1643 | |
1644 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1645 | out: |
1646 | seq_putc(m, '\n'); | |
b8c20a9b | 1647 | m_cache_vma(m, vma); |
f69ff943 SW |
1648 | return 0; |
1649 | } | |
5b52fc89 | 1650 | |
b7643757 SP |
1651 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1652 | { | |
1653 | return show_numa_map(m, v, 1); | |
1654 | } | |
1655 | ||
1656 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1657 | { | |
1658 | return show_numa_map(m, v, 0); | |
1659 | } | |
1660 | ||
03a44825 | 1661 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1662 | .start = m_start, |
1663 | .next = m_next, | |
1664 | .stop = m_stop, | |
1665 | .show = show_pid_numa_map, | |
6e21c8f1 | 1666 | }; |
662795de | 1667 | |
b7643757 SP |
1668 | static const struct seq_operations proc_tid_numa_maps_op = { |
1669 | .start = m_start, | |
1670 | .next = m_next, | |
1671 | .stop = m_stop, | |
1672 | .show = show_tid_numa_map, | |
1673 | }; | |
1674 | ||
1675 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1676 | const struct seq_operations *ops) | |
662795de | 1677 | { |
4db7d0ee ON |
1678 | return proc_maps_open(inode, file, ops, |
1679 | sizeof(struct numa_maps_private)); | |
662795de EB |
1680 | } |
1681 | ||
b7643757 SP |
1682 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1683 | { | |
1684 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1685 | } | |
1686 | ||
1687 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1688 | { | |
1689 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1690 | } | |
1691 | ||
1692 | const struct file_operations proc_pid_numa_maps_operations = { | |
1693 | .open = pid_numa_maps_open, | |
1694 | .read = seq_read, | |
1695 | .llseek = seq_lseek, | |
29a40ace | 1696 | .release = proc_map_release, |
b7643757 SP |
1697 | }; |
1698 | ||
1699 | const struct file_operations proc_tid_numa_maps_operations = { | |
1700 | .open = tid_numa_maps_open, | |
662795de EB |
1701 | .read = seq_read, |
1702 | .llseek = seq_lseek, | |
29a40ace | 1703 | .release = proc_map_release, |
662795de | 1704 | }; |
f69ff943 | 1705 | #endif /* CONFIG_NUMA */ |