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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | #include <linux/mm.h> |
615d6e87 | 3 | #include <linux/vmacache.h> |
1da177e4 | 4 | #include <linux/hugetlb.h> |
22e057c5 | 5 | #include <linux/huge_mm.h> |
1da177e4 LT |
6 | #include <linux/mount.h> |
7 | #include <linux/seq_file.h> | |
e070ad49 | 8 | #include <linux/highmem.h> |
5096add8 | 9 | #include <linux/ptrace.h> |
5a0e3ad6 | 10 | #include <linux/slab.h> |
6e21c8f1 CL |
11 | #include <linux/pagemap.h> |
12 | #include <linux/mempolicy.h> | |
22e057c5 | 13 | #include <linux/rmap.h> |
85863e47 | 14 | #include <linux/swap.h> |
6e84f315 | 15 | #include <linux/sched/mm.h> |
85863e47 | 16 | #include <linux/swapops.h> |
0f8975ec | 17 | #include <linux/mmu_notifier.h> |
33c3fc71 | 18 | #include <linux/page_idle.h> |
6a15a370 | 19 | #include <linux/shmem_fs.h> |
b3a81d08 | 20 | #include <linux/uaccess.h> |
e070ad49 | 21 | |
1da177e4 | 22 | #include <asm/elf.h> |
b3a81d08 | 23 | #include <asm/tlb.h> |
e070ad49 | 24 | #include <asm/tlbflush.h> |
1da177e4 LT |
25 | #include "internal.h" |
26 | ||
df5f8314 | 27 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 28 | { |
af5b0f6a | 29 | unsigned long text, lib, swap, anon, file, shmem; |
365e9c87 HD |
30 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
31 | ||
8cee852e JM |
32 | anon = get_mm_counter(mm, MM_ANONPAGES); |
33 | file = get_mm_counter(mm, MM_FILEPAGES); | |
34 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
35 | ||
365e9c87 HD |
36 | /* |
37 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
38 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
39 | * collector of these hiwater stats must therefore get total_vm | |
40 | * and rss too, which will usually be the higher. Barriers? not | |
41 | * worth the effort, such snapshots can always be inconsistent. | |
42 | */ | |
43 | hiwater_vm = total_vm = mm->total_vm; | |
44 | if (hiwater_vm < mm->hiwater_vm) | |
45 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 46 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
47 | if (hiwater_rss < mm->hiwater_rss) |
48 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 49 | |
1da177e4 LT |
50 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; |
51 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 52 | swap = get_mm_counter(mm, MM_SWAPENTS); |
df5f8314 | 53 | seq_printf(m, |
365e9c87 | 54 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
55 | "VmSize:\t%8lu kB\n" |
56 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 57 | "VmPin:\t%8lu kB\n" |
365e9c87 | 58 | "VmHWM:\t%8lu kB\n" |
1da177e4 | 59 | "VmRSS:\t%8lu kB\n" |
8cee852e JM |
60 | "RssAnon:\t%8lu kB\n" |
61 | "RssFile:\t%8lu kB\n" | |
62 | "RssShmem:\t%8lu kB\n" | |
1da177e4 LT |
63 | "VmData:\t%8lu kB\n" |
64 | "VmStk:\t%8lu kB\n" | |
65 | "VmExe:\t%8lu kB\n" | |
66 | "VmLib:\t%8lu kB\n" | |
b084d435 KH |
67 | "VmPTE:\t%8lu kB\n" |
68 | "VmSwap:\t%8lu kB\n", | |
365e9c87 | 69 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 70 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 71 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 72 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
73 | hiwater_rss << (PAGE_SHIFT-10), |
74 | total_rss << (PAGE_SHIFT-10), | |
8cee852e JM |
75 | anon << (PAGE_SHIFT-10), |
76 | file << (PAGE_SHIFT-10), | |
77 | shmem << (PAGE_SHIFT-10), | |
84638335 | 78 | mm->data_vm << (PAGE_SHIFT-10), |
1da177e4 | 79 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, |
af5b0f6a | 80 | mm_pgtables_bytes(mm) >> 10, |
b084d435 | 81 | swap << (PAGE_SHIFT-10)); |
5d317b2b | 82 | hugetlb_report_usage(m, mm); |
1da177e4 LT |
83 | } |
84 | ||
85 | unsigned long task_vsize(struct mm_struct *mm) | |
86 | { | |
87 | return PAGE_SIZE * mm->total_vm; | |
88 | } | |
89 | ||
a2ade7b6 AD |
90 | unsigned long task_statm(struct mm_struct *mm, |
91 | unsigned long *shared, unsigned long *text, | |
92 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 93 | { |
eca56ff9 JM |
94 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
95 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
96 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
97 | >> PAGE_SHIFT; | |
84638335 | 98 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 99 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
100 | return mm->total_vm; |
101 | } | |
102 | ||
9e781440 KH |
103 | #ifdef CONFIG_NUMA |
104 | /* | |
498f2371 | 105 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
106 | */ |
107 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
108 | { | |
109 | struct task_struct *task = priv->task; | |
110 | ||
111 | task_lock(task); | |
498f2371 | 112 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
113 | mpol_get(priv->task_mempolicy); |
114 | task_unlock(task); | |
115 | } | |
116 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
117 | { | |
118 | mpol_put(priv->task_mempolicy); | |
119 | } | |
120 | #else | |
121 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
122 | { | |
123 | } | |
124 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
125 | { | |
126 | } | |
127 | #endif | |
128 | ||
59b4bf12 | 129 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 130 | { |
59b4bf12 ON |
131 | struct mm_struct *mm = priv->mm; |
132 | ||
133 | release_task_mempolicy(priv); | |
134 | up_read(&mm->mmap_sem); | |
135 | mmput(mm); | |
a6198797 | 136 | } |
ec4dd3eb | 137 | |
ad2a00e4 ON |
138 | static struct vm_area_struct * |
139 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
140 | { | |
141 | if (vma == priv->tail_vma) | |
142 | return NULL; | |
143 | return vma->vm_next ?: priv->tail_vma; | |
144 | } | |
145 | ||
b8c20a9b ON |
146 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
147 | { | |
148 | if (m->count < m->size) /* vma is copied successfully */ | |
855af072 | 149 | m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL; |
b8c20a9b ON |
150 | } |
151 | ||
0c255321 | 152 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 153 | { |
a6198797 | 154 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 155 | unsigned long last_addr = m->version; |
a6198797 | 156 | struct mm_struct *mm; |
0c255321 ON |
157 | struct vm_area_struct *vma; |
158 | unsigned int pos = *ppos; | |
a6198797 | 159 | |
b8c20a9b ON |
160 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
161 | if (last_addr == -1UL) | |
162 | return NULL; | |
163 | ||
2c03376d | 164 | priv->task = get_proc_task(priv->inode); |
a6198797 | 165 | if (!priv->task) |
ec6fd8a4 | 166 | return ERR_PTR(-ESRCH); |
a6198797 | 167 | |
29a40ace | 168 | mm = priv->mm; |
388f7934 | 169 | if (!mm || !mmget_not_zero(mm)) |
29a40ace | 170 | return NULL; |
a6198797 | 171 | |
0c255321 | 172 | down_read(&mm->mmap_sem); |
9e781440 | 173 | hold_task_mempolicy(priv); |
0c255321 | 174 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 175 | |
b8c20a9b | 176 | if (last_addr) { |
855af072 RH |
177 | vma = find_vma(mm, last_addr - 1); |
178 | if (vma && vma->vm_start <= last_addr) | |
179 | vma = m_next_vma(priv, vma); | |
180 | if (vma) | |
b8c20a9b ON |
181 | return vma; |
182 | } | |
183 | ||
184 | m->version = 0; | |
0c255321 | 185 | if (pos < mm->map_count) { |
557c2d8a ON |
186 | for (vma = mm->mmap; pos; pos--) { |
187 | m->version = vma->vm_start; | |
a6198797 | 188 | vma = vma->vm_next; |
557c2d8a | 189 | } |
a6198797 | 190 | return vma; |
0c255321 | 191 | } |
a6198797 | 192 | |
557c2d8a | 193 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
194 | if (pos == mm->map_count && priv->tail_vma) |
195 | return priv->tail_vma; | |
59b4bf12 ON |
196 | |
197 | vma_stop(priv); | |
198 | return NULL; | |
a6198797 MM |
199 | } |
200 | ||
201 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
202 | { | |
203 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 204 | struct vm_area_struct *next; |
a6198797 MM |
205 | |
206 | (*pos)++; | |
ad2a00e4 | 207 | next = m_next_vma(priv, v); |
59b4bf12 ON |
208 | if (!next) |
209 | vma_stop(priv); | |
210 | return next; | |
a6198797 MM |
211 | } |
212 | ||
213 | static void m_stop(struct seq_file *m, void *v) | |
214 | { | |
215 | struct proc_maps_private *priv = m->private; | |
a6198797 | 216 | |
59b4bf12 ON |
217 | if (!IS_ERR_OR_NULL(v)) |
218 | vma_stop(priv); | |
0d5f5f45 | 219 | if (priv->task) { |
a6198797 | 220 | put_task_struct(priv->task); |
0d5f5f45 ON |
221 | priv->task = NULL; |
222 | } | |
a6198797 MM |
223 | } |
224 | ||
4db7d0ee ON |
225 | static int proc_maps_open(struct inode *inode, struct file *file, |
226 | const struct seq_operations *ops, int psize) | |
227 | { | |
228 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
229 | ||
230 | if (!priv) | |
231 | return -ENOMEM; | |
232 | ||
2c03376d | 233 | priv->inode = inode; |
29a40ace ON |
234 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
235 | if (IS_ERR(priv->mm)) { | |
236 | int err = PTR_ERR(priv->mm); | |
237 | ||
238 | seq_release_private(inode, file); | |
239 | return err; | |
240 | } | |
241 | ||
4db7d0ee ON |
242 | return 0; |
243 | } | |
244 | ||
29a40ace ON |
245 | static int proc_map_release(struct inode *inode, struct file *file) |
246 | { | |
247 | struct seq_file *seq = file->private_data; | |
248 | struct proc_maps_private *priv = seq->private; | |
249 | ||
250 | if (priv->mm) | |
251 | mmdrop(priv->mm); | |
252 | ||
493b0e9d | 253 | kfree(priv->rollup); |
29a40ace ON |
254 | return seq_release_private(inode, file); |
255 | } | |
256 | ||
a6198797 | 257 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 258 | const struct seq_operations *ops) |
a6198797 | 259 | { |
4db7d0ee ON |
260 | return proc_maps_open(inode, file, ops, |
261 | sizeof(struct proc_maps_private)); | |
a6198797 | 262 | } |
e070ad49 | 263 | |
65376df5 JW |
264 | /* |
265 | * Indicate if the VMA is a stack for the given task; for | |
266 | * /proc/PID/maps that is the stack of the main task. | |
267 | */ | |
1240ea0d | 268 | static int is_stack(struct vm_area_struct *vma) |
58cb6548 | 269 | { |
b18cb64e AL |
270 | /* |
271 | * We make no effort to guess what a given thread considers to be | |
272 | * its "stack". It's not even well-defined for programs written | |
273 | * languages like Go. | |
274 | */ | |
275 | return vma->vm_start <= vma->vm_mm->start_stack && | |
276 | vma->vm_end >= vma->vm_mm->start_stack; | |
58cb6548 ON |
277 | } |
278 | ||
493b0e9d DC |
279 | static void show_vma_header_prefix(struct seq_file *m, |
280 | unsigned long start, unsigned long end, | |
281 | vm_flags_t flags, unsigned long long pgoff, | |
282 | dev_t dev, unsigned long ino) | |
283 | { | |
284 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
285 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", | |
286 | start, | |
287 | end, | |
288 | flags & VM_READ ? 'r' : '-', | |
289 | flags & VM_WRITE ? 'w' : '-', | |
290 | flags & VM_EXEC ? 'x' : '-', | |
291 | flags & VM_MAYSHARE ? 's' : 'p', | |
292 | pgoff, | |
293 | MAJOR(dev), MINOR(dev), ino); | |
294 | } | |
295 | ||
b7643757 SP |
296 | static void |
297 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 298 | { |
e070ad49 ML |
299 | struct mm_struct *mm = vma->vm_mm; |
300 | struct file *file = vma->vm_file; | |
ca16d140 | 301 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 302 | unsigned long ino = 0; |
6260a4b0 | 303 | unsigned long long pgoff = 0; |
a09a79f6 | 304 | unsigned long start, end; |
1da177e4 | 305 | dev_t dev = 0; |
b7643757 | 306 | const char *name = NULL; |
1da177e4 LT |
307 | |
308 | if (file) { | |
c088e31d SF |
309 | struct inode *inode; |
310 | ||
311 | file = vma_pr_or_file(vma); | |
312 | inode = file_inode(file); | |
1da177e4 LT |
313 | dev = inode->i_sb->s_dev; |
314 | ino = inode->i_ino; | |
6260a4b0 | 315 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
316 | } |
317 | ||
d7824370 | 318 | start = vma->vm_start; |
a09a79f6 | 319 | end = vma->vm_end; |
493b0e9d | 320 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
1da177e4 LT |
321 | |
322 | /* | |
323 | * Print the dentry name for named mappings, and a | |
324 | * special [heap] marker for the heap: | |
325 | */ | |
e070ad49 | 326 | if (file) { |
652586df | 327 | seq_pad(m, ' '); |
2726d566 | 328 | seq_file_path(m, file, "\n"); |
b7643757 SP |
329 | goto done; |
330 | } | |
331 | ||
78d683e8 AL |
332 | if (vma->vm_ops && vma->vm_ops->name) { |
333 | name = vma->vm_ops->name(vma); | |
334 | if (name) | |
335 | goto done; | |
336 | } | |
337 | ||
b7643757 SP |
338 | name = arch_vma_name(vma); |
339 | if (!name) { | |
b7643757 SP |
340 | if (!mm) { |
341 | name = "[vdso]"; | |
342 | goto done; | |
343 | } | |
344 | ||
345 | if (vma->vm_start <= mm->brk && | |
346 | vma->vm_end >= mm->start_brk) { | |
347 | name = "[heap]"; | |
348 | goto done; | |
349 | } | |
350 | ||
1240ea0d | 351 | if (is_stack(vma)) |
65376df5 | 352 | name = "[stack]"; |
b7643757 SP |
353 | } |
354 | ||
355 | done: | |
356 | if (name) { | |
652586df | 357 | seq_pad(m, ' '); |
b7643757 | 358 | seq_puts(m, name); |
1da177e4 LT |
359 | } |
360 | seq_putc(m, '\n'); | |
7c88db0c JK |
361 | } |
362 | ||
b7643757 | 363 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c | 364 | { |
ebb6cdde | 365 | show_map_vma(m, v, is_pid); |
b8c20a9b | 366 | m_cache_vma(m, v); |
1da177e4 LT |
367 | return 0; |
368 | } | |
369 | ||
b7643757 SP |
370 | static int show_pid_map(struct seq_file *m, void *v) |
371 | { | |
372 | return show_map(m, v, 1); | |
373 | } | |
374 | ||
375 | static int show_tid_map(struct seq_file *m, void *v) | |
376 | { | |
377 | return show_map(m, v, 0); | |
378 | } | |
379 | ||
03a44825 | 380 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
381 | .start = m_start, |
382 | .next = m_next, | |
383 | .stop = m_stop, | |
b7643757 SP |
384 | .show = show_pid_map |
385 | }; | |
386 | ||
387 | static const struct seq_operations proc_tid_maps_op = { | |
388 | .start = m_start, | |
389 | .next = m_next, | |
390 | .stop = m_stop, | |
391 | .show = show_tid_map | |
a6198797 MM |
392 | }; |
393 | ||
b7643757 | 394 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
395 | { |
396 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
397 | } | |
398 | ||
b7643757 SP |
399 | static int tid_maps_open(struct inode *inode, struct file *file) |
400 | { | |
401 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
402 | } | |
403 | ||
404 | const struct file_operations proc_pid_maps_operations = { | |
405 | .open = pid_maps_open, | |
406 | .read = seq_read, | |
407 | .llseek = seq_lseek, | |
29a40ace | 408 | .release = proc_map_release, |
b7643757 SP |
409 | }; |
410 | ||
411 | const struct file_operations proc_tid_maps_operations = { | |
412 | .open = tid_maps_open, | |
a6198797 MM |
413 | .read = seq_read, |
414 | .llseek = seq_lseek, | |
29a40ace | 415 | .release = proc_map_release, |
a6198797 MM |
416 | }; |
417 | ||
418 | /* | |
419 | * Proportional Set Size(PSS): my share of RSS. | |
420 | * | |
421 | * PSS of a process is the count of pages it has in memory, where each | |
422 | * page is divided by the number of processes sharing it. So if a | |
423 | * process has 1000 pages all to itself, and 1000 shared with one other | |
424 | * process, its PSS will be 1500. | |
425 | * | |
426 | * To keep (accumulated) division errors low, we adopt a 64bit | |
427 | * fixed-point pss counter to minimize division errors. So (pss >> | |
428 | * PSS_SHIFT) would be the real byte count. | |
429 | * | |
430 | * A shift of 12 before division means (assuming 4K page size): | |
431 | * - 1M 3-user-pages add up to 8KB errors; | |
432 | * - supports mapcount up to 2^24, or 16M; | |
433 | * - supports PSS up to 2^52 bytes, or 4PB. | |
434 | */ | |
435 | #define PSS_SHIFT 12 | |
436 | ||
1e883281 | 437 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 438 | struct mem_size_stats { |
493b0e9d | 439 | bool first; |
a6198797 MM |
440 | unsigned long resident; |
441 | unsigned long shared_clean; | |
442 | unsigned long shared_dirty; | |
443 | unsigned long private_clean; | |
444 | unsigned long private_dirty; | |
445 | unsigned long referenced; | |
b40d4f84 | 446 | unsigned long anonymous; |
cf8496ea | 447 | unsigned long lazyfree; |
4031a219 | 448 | unsigned long anonymous_thp; |
65c45377 | 449 | unsigned long shmem_thp; |
214e471f | 450 | unsigned long swap; |
25ee01a2 NH |
451 | unsigned long shared_hugetlb; |
452 | unsigned long private_hugetlb; | |
493b0e9d | 453 | unsigned long first_vma_start; |
a6198797 | 454 | u64 pss; |
493b0e9d | 455 | u64 pss_locked; |
8334b962 | 456 | u64 swap_pss; |
c261e7d9 | 457 | bool check_shmem_swap; |
a6198797 MM |
458 | }; |
459 | ||
c164e038 | 460 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
afd9883f | 461 | bool compound, bool young, bool dirty) |
c164e038 | 462 | { |
f4be6153 | 463 | int i, nr = compound ? 1 << compound_order(page) : 1; |
afd9883f | 464 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 465 | |
cf8496ea | 466 | if (PageAnon(page)) { |
c164e038 | 467 | mss->anonymous += size; |
cf8496ea SL |
468 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
469 | mss->lazyfree += size; | |
470 | } | |
c164e038 KS |
471 | |
472 | mss->resident += size; | |
473 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 474 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 475 | mss->referenced += size; |
c164e038 | 476 | |
afd9883f KS |
477 | /* |
478 | * page_count(page) == 1 guarantees the page is mapped exactly once. | |
479 | * If any subpage of the compound page mapped with PTE it would elevate | |
480 | * page_count(). | |
481 | */ | |
482 | if (page_count(page) == 1) { | |
c164e038 KS |
483 | if (dirty || PageDirty(page)) |
484 | mss->private_dirty += size; | |
485 | else | |
486 | mss->private_clean += size; | |
487 | mss->pss += (u64)size << PSS_SHIFT; | |
afd9883f KS |
488 | return; |
489 | } | |
490 | ||
491 | for (i = 0; i < nr; i++, page++) { | |
492 | int mapcount = page_mapcount(page); | |
493 | ||
494 | if (mapcount >= 2) { | |
495 | if (dirty || PageDirty(page)) | |
496 | mss->shared_dirty += PAGE_SIZE; | |
497 | else | |
498 | mss->shared_clean += PAGE_SIZE; | |
499 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; | |
500 | } else { | |
501 | if (dirty || PageDirty(page)) | |
502 | mss->private_dirty += PAGE_SIZE; | |
503 | else | |
504 | mss->private_clean += PAGE_SIZE; | |
505 | mss->pss += PAGE_SIZE << PSS_SHIFT; | |
506 | } | |
c164e038 KS |
507 | } |
508 | } | |
ae11c4d9 | 509 | |
c261e7d9 | 510 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
511 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
512 | struct mm_walk *walk) | |
513 | { | |
514 | struct mem_size_stats *mss = walk->private; | |
515 | ||
48131e03 VB |
516 | mss->swap += shmem_partial_swap_usage( |
517 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
518 | |
519 | return 0; | |
520 | } | |
c261e7d9 VB |
521 | #endif |
522 | ||
c164e038 KS |
523 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
524 | struct mm_walk *walk) | |
ae11c4d9 DH |
525 | { |
526 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 527 | struct vm_area_struct *vma = walk->vma; |
b1d4d9e0 | 528 | struct page *page = NULL; |
ae11c4d9 | 529 | |
c164e038 KS |
530 | if (pte_present(*pte)) { |
531 | page = vm_normal_page(vma, addr, *pte); | |
532 | } else if (is_swap_pte(*pte)) { | |
533 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 534 | |
8334b962 MK |
535 | if (!non_swap_entry(swpent)) { |
536 | int mapcount; | |
537 | ||
c164e038 | 538 | mss->swap += PAGE_SIZE; |
8334b962 MK |
539 | mapcount = swp_swapcount(swpent); |
540 | if (mapcount >= 2) { | |
541 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
542 | ||
543 | do_div(pss_delta, mapcount); | |
544 | mss->swap_pss += pss_delta; | |
545 | } else { | |
546 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
547 | } | |
548 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 549 | page = migration_entry_to_page(swpent); |
5042db43 JG |
550 | else if (is_device_private_entry(swpent)) |
551 | page = device_private_entry_to_page(swpent); | |
c261e7d9 VB |
552 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
553 | && pte_none(*pte))) { | |
48131e03 VB |
554 | page = find_get_entry(vma->vm_file->f_mapping, |
555 | linear_page_index(vma, addr)); | |
556 | if (!page) | |
557 | return; | |
558 | ||
559 | if (radix_tree_exceptional_entry(page)) | |
560 | mss->swap += PAGE_SIZE; | |
561 | else | |
09cbfeaf | 562 | put_page(page); |
48131e03 VB |
563 | |
564 | return; | |
b1d4d9e0 | 565 | } |
ae11c4d9 | 566 | |
ae11c4d9 DH |
567 | if (!page) |
568 | return; | |
afd9883f KS |
569 | |
570 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); | |
ae11c4d9 DH |
571 | } |
572 | ||
c164e038 KS |
573 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
574 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
575 | struct mm_walk *walk) | |
576 | { | |
577 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 578 | struct vm_area_struct *vma = walk->vma; |
c164e038 KS |
579 | struct page *page; |
580 | ||
581 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
582 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
583 | if (IS_ERR_OR_NULL(page)) | |
584 | return; | |
65c45377 KS |
585 | if (PageAnon(page)) |
586 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
587 | else if (PageSwapBacked(page)) | |
588 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
589 | else if (is_zone_device_page(page)) |
590 | /* pass */; | |
65c45377 KS |
591 | else |
592 | VM_BUG_ON_PAGE(1, page); | |
afd9883f | 593 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
c164e038 KS |
594 | } |
595 | #else | |
596 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
597 | struct mm_walk *walk) | |
598 | { | |
599 | } | |
600 | #endif | |
601 | ||
b3ae5acb | 602 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 603 | struct mm_walk *walk) |
e070ad49 | 604 | { |
14eb6fdd | 605 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 606 | pte_t *pte; |
705e87c0 | 607 | spinlock_t *ptl; |
e070ad49 | 608 | |
b6ec57f4 KS |
609 | ptl = pmd_trans_huge_lock(pmd, vma); |
610 | if (ptl) { | |
84c3fc4e ZY |
611 | if (pmd_present(*pmd)) |
612 | smaps_pmd_entry(pmd, addr, walk); | |
bf929152 | 613 | spin_unlock(ptl); |
14038302 | 614 | goto out; |
22e057c5 | 615 | } |
1a5a9906 AA |
616 | |
617 | if (pmd_trans_unstable(pmd)) | |
14038302 | 618 | goto out; |
22e057c5 DH |
619 | /* |
620 | * The mmap_sem held all the way back in m_start() is what | |
621 | * keeps khugepaged out of here and from collapsing things | |
622 | * in here. | |
623 | */ | |
705e87c0 | 624 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 625 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 626 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 627 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 628 | out: |
705e87c0 | 629 | cond_resched(); |
b3ae5acb | 630 | return 0; |
e070ad49 ML |
631 | } |
632 | ||
834f82e2 CG |
633 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
634 | { | |
635 | /* | |
636 | * Don't forget to update Documentation/ on changes. | |
637 | */ | |
638 | static const char mnemonics[BITS_PER_LONG][2] = { | |
639 | /* | |
640 | * In case if we meet a flag we don't know about. | |
641 | */ | |
642 | [0 ... (BITS_PER_LONG-1)] = "??", | |
643 | ||
644 | [ilog2(VM_READ)] = "rd", | |
645 | [ilog2(VM_WRITE)] = "wr", | |
646 | [ilog2(VM_EXEC)] = "ex", | |
647 | [ilog2(VM_SHARED)] = "sh", | |
648 | [ilog2(VM_MAYREAD)] = "mr", | |
649 | [ilog2(VM_MAYWRITE)] = "mw", | |
650 | [ilog2(VM_MAYEXEC)] = "me", | |
651 | [ilog2(VM_MAYSHARE)] = "ms", | |
652 | [ilog2(VM_GROWSDOWN)] = "gd", | |
653 | [ilog2(VM_PFNMAP)] = "pf", | |
654 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
655 | #ifdef CONFIG_X86_INTEL_MPX |
656 | [ilog2(VM_MPX)] = "mp", | |
657 | #endif | |
834f82e2 CG |
658 | [ilog2(VM_LOCKED)] = "lo", |
659 | [ilog2(VM_IO)] = "io", | |
660 | [ilog2(VM_SEQ_READ)] = "sr", | |
661 | [ilog2(VM_RAND_READ)] = "rr", | |
662 | [ilog2(VM_DONTCOPY)] = "dc", | |
663 | [ilog2(VM_DONTEXPAND)] = "de", | |
664 | [ilog2(VM_ACCOUNT)] = "ac", | |
665 | [ilog2(VM_NORESERVE)] = "nr", | |
666 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 667 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 668 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 669 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 670 | [ilog2(VM_DONTDUMP)] = "dd", |
ec8e41ae NH |
671 | #ifdef CONFIG_MEM_SOFT_DIRTY |
672 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
673 | #endif | |
834f82e2 CG |
674 | [ilog2(VM_MIXEDMAP)] = "mm", |
675 | [ilog2(VM_HUGEPAGE)] = "hg", | |
676 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
677 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
678 | [ilog2(VM_UFFD_MISSING)]= "um", |
679 | [ilog2(VM_UFFD_WP)] = "uw", | |
c1192f84 DH |
680 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
681 | /* These come out via ProtectionKey: */ | |
682 | [ilog2(VM_PKEY_BIT0)] = "", | |
683 | [ilog2(VM_PKEY_BIT1)] = "", | |
684 | [ilog2(VM_PKEY_BIT2)] = "", | |
685 | [ilog2(VM_PKEY_BIT3)] = "", | |
686 | #endif | |
834f82e2 CG |
687 | }; |
688 | size_t i; | |
689 | ||
690 | seq_puts(m, "VmFlags: "); | |
691 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
692 | if (!mnemonics[i][0]) |
693 | continue; | |
834f82e2 CG |
694 | if (vma->vm_flags & (1UL << i)) { |
695 | seq_printf(m, "%c%c ", | |
696 | mnemonics[i][0], mnemonics[i][1]); | |
697 | } | |
698 | } | |
699 | seq_putc(m, '\n'); | |
700 | } | |
701 | ||
25ee01a2 NH |
702 | #ifdef CONFIG_HUGETLB_PAGE |
703 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
704 | unsigned long addr, unsigned long end, | |
705 | struct mm_walk *walk) | |
706 | { | |
707 | struct mem_size_stats *mss = walk->private; | |
708 | struct vm_area_struct *vma = walk->vma; | |
709 | struct page *page = NULL; | |
710 | ||
711 | if (pte_present(*pte)) { | |
712 | page = vm_normal_page(vma, addr, *pte); | |
713 | } else if (is_swap_pte(*pte)) { | |
714 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
715 | ||
716 | if (is_migration_entry(swpent)) | |
717 | page = migration_entry_to_page(swpent); | |
5042db43 JG |
718 | else if (is_device_private_entry(swpent)) |
719 | page = device_private_entry_to_page(swpent); | |
25ee01a2 NH |
720 | } |
721 | if (page) { | |
722 | int mapcount = page_mapcount(page); | |
723 | ||
724 | if (mapcount >= 2) | |
725 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
726 | else | |
727 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
728 | } | |
729 | return 0; | |
730 | } | |
731 | #endif /* HUGETLB_PAGE */ | |
732 | ||
c1192f84 DH |
733 | void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) |
734 | { | |
735 | } | |
736 | ||
b7643757 | 737 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 | 738 | { |
493b0e9d | 739 | struct proc_maps_private *priv = m->private; |
e070ad49 | 740 | struct vm_area_struct *vma = v; |
493b0e9d DC |
741 | struct mem_size_stats mss_stack; |
742 | struct mem_size_stats *mss; | |
2165009b DH |
743 | struct mm_walk smaps_walk = { |
744 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
745 | #ifdef CONFIG_HUGETLB_PAGE |
746 | .hugetlb_entry = smaps_hugetlb_range, | |
747 | #endif | |
2165009b | 748 | .mm = vma->vm_mm, |
2165009b | 749 | }; |
493b0e9d DC |
750 | int ret = 0; |
751 | bool rollup_mode; | |
752 | bool last_vma; | |
753 | ||
754 | if (priv->rollup) { | |
755 | rollup_mode = true; | |
756 | mss = priv->rollup; | |
757 | if (mss->first) { | |
758 | mss->first_vma_start = vma->vm_start; | |
759 | mss->first = false; | |
760 | } | |
761 | last_vma = !m_next_vma(priv, vma); | |
762 | } else { | |
763 | rollup_mode = false; | |
764 | memset(&mss_stack, 0, sizeof(mss_stack)); | |
765 | mss = &mss_stack; | |
766 | } | |
e070ad49 | 767 | |
493b0e9d | 768 | smaps_walk.private = mss; |
c261e7d9 VB |
769 | |
770 | #ifdef CONFIG_SHMEM | |
771 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { | |
6a15a370 VB |
772 | /* |
773 | * For shared or readonly shmem mappings we know that all | |
774 | * swapped out pages belong to the shmem object, and we can | |
775 | * obtain the swap value much more efficiently. For private | |
776 | * writable mappings, we might have COW pages that are | |
777 | * not affected by the parent swapped out pages of the shmem | |
778 | * object, so we have to distinguish them during the page walk. | |
779 | * Unless we know that the shmem object (or the part mapped by | |
780 | * our VMA) has no swapped out pages at all. | |
781 | */ | |
782 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
783 | ||
784 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
785 | !(vma->vm_flags & VM_WRITE)) { | |
493b0e9d | 786 | mss->swap = shmem_swapped; |
6a15a370 | 787 | } else { |
493b0e9d | 788 | mss->check_shmem_swap = true; |
6a15a370 VB |
789 | smaps_walk.pte_hole = smaps_pte_hole; |
790 | } | |
c261e7d9 VB |
791 | } |
792 | #endif | |
793 | ||
d82ef020 | 794 | /* mmap_sem is held in m_start */ |
14eb6fdd | 795 | walk_page_vma(vma, &smaps_walk); |
493b0e9d DC |
796 | if (vma->vm_flags & VM_LOCKED) |
797 | mss->pss_locked += mss->pss; | |
798 | ||
799 | if (!rollup_mode) { | |
800 | show_map_vma(m, vma, is_pid); | |
801 | } else if (last_vma) { | |
802 | show_vma_header_prefix( | |
803 | m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0); | |
804 | seq_pad(m, ' '); | |
805 | seq_puts(m, "[rollup]\n"); | |
806 | } else { | |
807 | ret = SEQ_SKIP; | |
808 | } | |
4752c369 | 809 | |
493b0e9d DC |
810 | if (!rollup_mode) |
811 | seq_printf(m, | |
812 | "Size: %8lu kB\n" | |
813 | "KernelPageSize: %8lu kB\n" | |
814 | "MMUPageSize: %8lu kB\n", | |
815 | (vma->vm_end - vma->vm_start) >> 10, | |
816 | vma_kernel_pagesize(vma) >> 10, | |
817 | vma_mmu_pagesize(vma) >> 10); | |
818 | ||
819 | ||
820 | if (!rollup_mode || last_vma) | |
821 | seq_printf(m, | |
822 | "Rss: %8lu kB\n" | |
823 | "Pss: %8lu kB\n" | |
824 | "Shared_Clean: %8lu kB\n" | |
825 | "Shared_Dirty: %8lu kB\n" | |
826 | "Private_Clean: %8lu kB\n" | |
827 | "Private_Dirty: %8lu kB\n" | |
828 | "Referenced: %8lu kB\n" | |
829 | "Anonymous: %8lu kB\n" | |
830 | "LazyFree: %8lu kB\n" | |
831 | "AnonHugePages: %8lu kB\n" | |
832 | "ShmemPmdMapped: %8lu kB\n" | |
833 | "Shared_Hugetlb: %8lu kB\n" | |
834 | "Private_Hugetlb: %7lu kB\n" | |
835 | "Swap: %8lu kB\n" | |
836 | "SwapPss: %8lu kB\n" | |
837 | "Locked: %8lu kB\n", | |
838 | mss->resident >> 10, | |
839 | (unsigned long)(mss->pss >> (10 + PSS_SHIFT)), | |
840 | mss->shared_clean >> 10, | |
841 | mss->shared_dirty >> 10, | |
842 | mss->private_clean >> 10, | |
843 | mss->private_dirty >> 10, | |
844 | mss->referenced >> 10, | |
845 | mss->anonymous >> 10, | |
846 | mss->lazyfree >> 10, | |
847 | mss->anonymous_thp >> 10, | |
848 | mss->shmem_thp >> 10, | |
849 | mss->shared_hugetlb >> 10, | |
850 | mss->private_hugetlb >> 10, | |
851 | mss->swap >> 10, | |
852 | (unsigned long)(mss->swap_pss >> (10 + PSS_SHIFT)), | |
853 | (unsigned long)(mss->pss >> (10 + PSS_SHIFT))); | |
854 | ||
855 | if (!rollup_mode) { | |
856 | arch_show_smap(m, vma); | |
857 | show_smap_vma_flags(m, vma); | |
858 | } | |
b8c20a9b | 859 | m_cache_vma(m, vma); |
493b0e9d | 860 | return ret; |
e070ad49 ML |
861 | } |
862 | ||
b7643757 SP |
863 | static int show_pid_smap(struct seq_file *m, void *v) |
864 | { | |
865 | return show_smap(m, v, 1); | |
866 | } | |
867 | ||
868 | static int show_tid_smap(struct seq_file *m, void *v) | |
869 | { | |
870 | return show_smap(m, v, 0); | |
871 | } | |
872 | ||
03a44825 | 873 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
874 | .start = m_start, |
875 | .next = m_next, | |
876 | .stop = m_stop, | |
b7643757 SP |
877 | .show = show_pid_smap |
878 | }; | |
879 | ||
880 | static const struct seq_operations proc_tid_smaps_op = { | |
881 | .start = m_start, | |
882 | .next = m_next, | |
883 | .stop = m_stop, | |
884 | .show = show_tid_smap | |
a6198797 MM |
885 | }; |
886 | ||
b7643757 | 887 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
888 | { |
889 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
890 | } | |
891 | ||
493b0e9d DC |
892 | static int pid_smaps_rollup_open(struct inode *inode, struct file *file) |
893 | { | |
894 | struct seq_file *seq; | |
895 | struct proc_maps_private *priv; | |
896 | int ret = do_maps_open(inode, file, &proc_pid_smaps_op); | |
897 | ||
898 | if (ret < 0) | |
899 | return ret; | |
900 | seq = file->private_data; | |
901 | priv = seq->private; | |
902 | priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL); | |
903 | if (!priv->rollup) { | |
904 | proc_map_release(inode, file); | |
905 | return -ENOMEM; | |
906 | } | |
907 | priv->rollup->first = true; | |
908 | return 0; | |
909 | } | |
910 | ||
b7643757 SP |
911 | static int tid_smaps_open(struct inode *inode, struct file *file) |
912 | { | |
913 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
914 | } | |
915 | ||
916 | const struct file_operations proc_pid_smaps_operations = { | |
917 | .open = pid_smaps_open, | |
918 | .read = seq_read, | |
919 | .llseek = seq_lseek, | |
29a40ace | 920 | .release = proc_map_release, |
b7643757 SP |
921 | }; |
922 | ||
493b0e9d DC |
923 | const struct file_operations proc_pid_smaps_rollup_operations = { |
924 | .open = pid_smaps_rollup_open, | |
925 | .read = seq_read, | |
926 | .llseek = seq_lseek, | |
927 | .release = proc_map_release, | |
928 | }; | |
929 | ||
b7643757 SP |
930 | const struct file_operations proc_tid_smaps_operations = { |
931 | .open = tid_smaps_open, | |
a6198797 MM |
932 | .read = seq_read, |
933 | .llseek = seq_lseek, | |
29a40ace | 934 | .release = proc_map_release, |
a6198797 MM |
935 | }; |
936 | ||
040fa020 PE |
937 | enum clear_refs_types { |
938 | CLEAR_REFS_ALL = 1, | |
939 | CLEAR_REFS_ANON, | |
940 | CLEAR_REFS_MAPPED, | |
0f8975ec | 941 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 942 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
943 | CLEAR_REFS_LAST, |
944 | }; | |
945 | ||
af9de7eb | 946 | struct clear_refs_private { |
0f8975ec | 947 | enum clear_refs_types type; |
af9de7eb PE |
948 | }; |
949 | ||
7d5b3bfa | 950 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
951 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
952 | unsigned long addr, pte_t *pte) | |
953 | { | |
0f8975ec PE |
954 | /* |
955 | * The soft-dirty tracker uses #PF-s to catch writes | |
956 | * to pages, so write-protect the pte as well. See the | |
957 | * Documentation/vm/soft-dirty.txt for full description | |
958 | * of how soft-dirty works. | |
959 | */ | |
960 | pte_t ptent = *pte; | |
179ef71c CG |
961 | |
962 | if (pte_present(ptent)) { | |
326c2597 | 963 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
179ef71c | 964 | ptent = pte_wrprotect(ptent); |
a7b76174 | 965 | ptent = pte_clear_soft_dirty(ptent); |
326c2597 | 966 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
179ef71c CG |
967 | } else if (is_swap_pte(ptent)) { |
968 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 969 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 970 | } |
0f8975ec | 971 | } |
5d3875a0 LD |
972 | #else |
973 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
974 | unsigned long addr, pte_t *pte) | |
975 | { | |
976 | } | |
977 | #endif | |
0f8975ec | 978 | |
5d3875a0 | 979 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
980 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
981 | unsigned long addr, pmd_t *pmdp) | |
982 | { | |
5b7abeae KS |
983 | pmd_t pmd = *pmdp; |
984 | ||
ab6e3d09 NH |
985 | if (pmd_present(pmd)) { |
986 | /* See comment in change_huge_pmd() */ | |
987 | pmdp_invalidate(vma, addr, pmdp); | |
988 | if (pmd_dirty(*pmdp)) | |
989 | pmd = pmd_mkdirty(pmd); | |
990 | if (pmd_young(*pmdp)) | |
991 | pmd = pmd_mkyoung(pmd); | |
992 | ||
993 | pmd = pmd_wrprotect(pmd); | |
994 | pmd = pmd_clear_soft_dirty(pmd); | |
995 | ||
996 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
997 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
998 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
999 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
1000 | } | |
7d5b3bfa | 1001 | } |
7d5b3bfa | 1002 | #else |
7d5b3bfa KS |
1003 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1004 | unsigned long addr, pmd_t *pmdp) | |
1005 | { | |
1006 | } | |
1007 | #endif | |
1008 | ||
a6198797 | 1009 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1010 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1011 | { |
af9de7eb | 1012 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1013 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1014 | pte_t *pte, ptent; |
1015 | spinlock_t *ptl; | |
1016 | struct page *page; | |
1017 | ||
b6ec57f4 KS |
1018 | ptl = pmd_trans_huge_lock(pmd, vma); |
1019 | if (ptl) { | |
7d5b3bfa KS |
1020 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1021 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1022 | goto out; | |
1023 | } | |
1024 | ||
84c3fc4e ZY |
1025 | if (!pmd_present(*pmd)) |
1026 | goto out; | |
1027 | ||
7d5b3bfa KS |
1028 | page = pmd_page(*pmd); |
1029 | ||
1030 | /* Clear accessed and referenced bits. */ | |
1031 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1032 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1033 | ClearPageReferenced(page); |
1034 | out: | |
1035 | spin_unlock(ptl); | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1a5a9906 AA |
1039 | if (pmd_trans_unstable(pmd)) |
1040 | return 0; | |
03319327 | 1041 | |
a6198797 MM |
1042 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1043 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1044 | ptent = *pte; | |
a6198797 | 1045 | |
0f8975ec PE |
1046 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1047 | clear_soft_dirty(vma, addr, pte); | |
1048 | continue; | |
1049 | } | |
1050 | ||
179ef71c CG |
1051 | if (!pte_present(ptent)) |
1052 | continue; | |
1053 | ||
a6198797 MM |
1054 | page = vm_normal_page(vma, addr, ptent); |
1055 | if (!page) | |
1056 | continue; | |
1057 | ||
1058 | /* Clear accessed and referenced bits. */ | |
1059 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1060 | test_and_clear_page_young(page); |
a6198797 MM |
1061 | ClearPageReferenced(page); |
1062 | } | |
1063 | pte_unmap_unlock(pte - 1, ptl); | |
1064 | cond_resched(); | |
1065 | return 0; | |
1066 | } | |
1067 | ||
5c64f52a NH |
1068 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1069 | struct mm_walk *walk) | |
1070 | { | |
1071 | struct clear_refs_private *cp = walk->private; | |
1072 | struct vm_area_struct *vma = walk->vma; | |
1073 | ||
48684a65 NH |
1074 | if (vma->vm_flags & VM_PFNMAP) |
1075 | return 1; | |
1076 | ||
5c64f52a NH |
1077 | /* |
1078 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1079 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1080 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1081 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1082 | */ | |
1083 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1084 | return 1; | |
1085 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1086 | return 1; | |
1087 | return 0; | |
1088 | } | |
1089 | ||
f248dcb3 MM |
1090 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1091 | size_t count, loff_t *ppos) | |
b813e931 | 1092 | { |
f248dcb3 | 1093 | struct task_struct *task; |
fb92a4b0 | 1094 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1095 | struct mm_struct *mm; |
b813e931 | 1096 | struct vm_area_struct *vma; |
040fa020 | 1097 | enum clear_refs_types type; |
b3a81d08 | 1098 | struct mmu_gather tlb; |
040fa020 | 1099 | int itype; |
0a8cb8e3 | 1100 | int rv; |
b813e931 | 1101 | |
f248dcb3 MM |
1102 | memset(buffer, 0, sizeof(buffer)); |
1103 | if (count > sizeof(buffer) - 1) | |
1104 | count = sizeof(buffer) - 1; | |
1105 | if (copy_from_user(buffer, buf, count)) | |
1106 | return -EFAULT; | |
040fa020 | 1107 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1108 | if (rv < 0) |
1109 | return rv; | |
040fa020 PE |
1110 | type = (enum clear_refs_types)itype; |
1111 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1112 | return -EINVAL; |
541c237c | 1113 | |
496ad9aa | 1114 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1115 | if (!task) |
1116 | return -ESRCH; | |
1117 | mm = get_task_mm(task); | |
1118 | if (mm) { | |
af9de7eb | 1119 | struct clear_refs_private cp = { |
0f8975ec | 1120 | .type = type, |
af9de7eb | 1121 | }; |
20cbc972 AM |
1122 | struct mm_walk clear_refs_walk = { |
1123 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 1124 | .test_walk = clear_refs_test_walk, |
20cbc972 | 1125 | .mm = mm, |
af9de7eb | 1126 | .private = &cp, |
20cbc972 | 1127 | }; |
695f0559 PC |
1128 | |
1129 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
4e80153a MH |
1130 | if (down_write_killable(&mm->mmap_sem)) { |
1131 | count = -EINTR; | |
1132 | goto out_mm; | |
1133 | } | |
1134 | ||
695f0559 PC |
1135 | /* |
1136 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1137 | * resident set size to this mm's current rss value. | |
1138 | */ | |
695f0559 PC |
1139 | reset_mm_hiwater_rss(mm); |
1140 | up_write(&mm->mmap_sem); | |
1141 | goto out_mm; | |
1142 | } | |
1143 | ||
f248dcb3 | 1144 | down_read(&mm->mmap_sem); |
b3a81d08 | 1145 | tlb_gather_mmu(&tlb, mm, 0, -1); |
64e45507 PF |
1146 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1147 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1148 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1149 | continue; | |
1150 | up_read(&mm->mmap_sem); | |
4e80153a MH |
1151 | if (down_write_killable(&mm->mmap_sem)) { |
1152 | count = -EINTR; | |
1153 | goto out_mm; | |
1154 | } | |
64e45507 PF |
1155 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1156 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1157 | vma_set_page_prot(vma); | |
1158 | } | |
1159 | downgrade_write(&mm->mmap_sem); | |
1160 | break; | |
1161 | } | |
0f8975ec | 1162 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 1163 | } |
0f30206b | 1164 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
0f8975ec PE |
1165 | if (type == CLEAR_REFS_SOFT_DIRTY) |
1166 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
b3a81d08 | 1167 | tlb_finish_mmu(&tlb, 0, -1); |
f248dcb3 | 1168 | up_read(&mm->mmap_sem); |
695f0559 | 1169 | out_mm: |
f248dcb3 MM |
1170 | mmput(mm); |
1171 | } | |
1172 | put_task_struct(task); | |
fb92a4b0 VL |
1173 | |
1174 | return count; | |
b813e931 DR |
1175 | } |
1176 | ||
f248dcb3 MM |
1177 | const struct file_operations proc_clear_refs_operations = { |
1178 | .write = clear_refs_write, | |
6038f373 | 1179 | .llseek = noop_llseek, |
f248dcb3 MM |
1180 | }; |
1181 | ||
092b50ba NH |
1182 | typedef struct { |
1183 | u64 pme; | |
1184 | } pagemap_entry_t; | |
1185 | ||
85863e47 | 1186 | struct pagemapread { |
8c829622 | 1187 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1188 | pagemap_entry_t *buffer; |
1c90308e | 1189 | bool show_pfn; |
85863e47 MM |
1190 | }; |
1191 | ||
5aaabe83 NH |
1192 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1193 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1194 | ||
deb94544 KK |
1195 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1196 | #define PM_PFRAME_BITS 55 | |
1197 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1198 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1199 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1200 | #define PM_FILE BIT_ULL(61) |
1201 | #define PM_SWAP BIT_ULL(62) | |
1202 | #define PM_PRESENT BIT_ULL(63) | |
1203 | ||
85863e47 MM |
1204 | #define PM_END_OF_BUFFER 1 |
1205 | ||
deb94544 | 1206 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1207 | { |
deb94544 | 1208 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1209 | } |
1210 | ||
1211 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1212 | struct pagemapread *pm) |
1213 | { | |
092b50ba | 1214 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1215 | if (pm->pos >= pm->len) |
aae8679b | 1216 | return PM_END_OF_BUFFER; |
85863e47 MM |
1217 | return 0; |
1218 | } | |
1219 | ||
1220 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1221 | struct mm_walk *walk) |
85863e47 | 1222 | { |
2165009b | 1223 | struct pagemapread *pm = walk->private; |
68b5a652 | 1224 | unsigned long addr = start; |
85863e47 | 1225 | int err = 0; |
092b50ba | 1226 | |
68b5a652 PF |
1227 | while (addr < end) { |
1228 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1229 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1230 | /* End of address space hole, which we mark as non-present. */ |
1231 | unsigned long hole_end; | |
68b5a652 | 1232 | |
87e6d49a PF |
1233 | if (vma) |
1234 | hole_end = min(end, vma->vm_start); | |
1235 | else | |
1236 | hole_end = end; | |
1237 | ||
1238 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1239 | err = add_to_pagemap(addr, &pme, pm); | |
1240 | if (err) | |
1241 | goto out; | |
68b5a652 PF |
1242 | } |
1243 | ||
87e6d49a PF |
1244 | if (!vma) |
1245 | break; | |
1246 | ||
1247 | /* Addresses in the VMA. */ | |
1248 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1249 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1250 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1251 | err = add_to_pagemap(addr, &pme, pm); |
1252 | if (err) | |
1253 | goto out; | |
1254 | } | |
85863e47 | 1255 | } |
68b5a652 | 1256 | out: |
85863e47 MM |
1257 | return err; |
1258 | } | |
1259 | ||
deb94544 | 1260 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1261 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1262 | { |
deb94544 | 1263 | u64 frame = 0, flags = 0; |
052fb0d6 | 1264 | struct page *page = NULL; |
85863e47 | 1265 | |
052fb0d6 | 1266 | if (pte_present(pte)) { |
1c90308e KK |
1267 | if (pm->show_pfn) |
1268 | frame = pte_pfn(pte); | |
deb94544 | 1269 | flags |= PM_PRESENT; |
df6ad698 | 1270 | page = _vm_normal_page(vma, addr, pte, true); |
e9cdd6e7 | 1271 | if (pte_soft_dirty(pte)) |
deb94544 | 1272 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1273 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1274 | swp_entry_t entry; |
1275 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1276 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1277 | entry = pte_to_swp_entry(pte); |
052fb0d6 KK |
1278 | frame = swp_type(entry) | |
1279 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1280 | flags |= PM_SWAP; |
052fb0d6 KK |
1281 | if (is_migration_entry(entry)) |
1282 | page = migration_entry_to_page(entry); | |
5042db43 JG |
1283 | |
1284 | if (is_device_private_entry(entry)) | |
1285 | page = device_private_entry_to_page(entry); | |
052fb0d6 KK |
1286 | } |
1287 | ||
1288 | if (page && !PageAnon(page)) | |
1289 | flags |= PM_FILE; | |
77bb499b KK |
1290 | if (page && page_mapcount(page) == 1) |
1291 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1292 | if (vma->vm_flags & VM_SOFTDIRTY) |
1293 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1294 | |
deb94544 | 1295 | return make_pme(frame, flags); |
bcf8039e DH |
1296 | } |
1297 | ||
356515e7 | 1298 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1299 | struct mm_walk *walk) |
85863e47 | 1300 | { |
f995ece2 | 1301 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1302 | struct pagemapread *pm = walk->private; |
bf929152 | 1303 | spinlock_t *ptl; |
05fbf357 | 1304 | pte_t *pte, *orig_pte; |
85863e47 MM |
1305 | int err = 0; |
1306 | ||
356515e7 | 1307 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1308 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1309 | if (ptl) { | |
356515e7 KK |
1310 | u64 flags = 0, frame = 0; |
1311 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1312 | struct page *page = NULL; |
0f8975ec | 1313 | |
b83d7e43 | 1314 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1315 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1316 | |
356515e7 | 1317 | if (pmd_present(pmd)) { |
84c3fc4e | 1318 | page = pmd_page(pmd); |
77bb499b | 1319 | |
356515e7 | 1320 | flags |= PM_PRESENT; |
b83d7e43 HY |
1321 | if (pmd_soft_dirty(pmd)) |
1322 | flags |= PM_SOFT_DIRTY; | |
1c90308e KK |
1323 | if (pm->show_pfn) |
1324 | frame = pmd_pfn(pmd) + | |
1325 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1326 | } |
84c3fc4e ZY |
1327 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1328 | else if (is_swap_pmd(pmd)) { | |
1329 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
8753dccb | 1330 | unsigned long offset = swp_offset(entry); |
84c3fc4e | 1331 | |
8753dccb | 1332 | offset += (addr & ~PMD_MASK) >> PAGE_SHIFT; |
84c3fc4e | 1333 | frame = swp_type(entry) | |
8753dccb | 1334 | (offset << MAX_SWAPFILES_SHIFT); |
84c3fc4e | 1335 | flags |= PM_SWAP; |
b83d7e43 HY |
1336 | if (pmd_swp_soft_dirty(pmd)) |
1337 | flags |= PM_SOFT_DIRTY; | |
84c3fc4e ZY |
1338 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
1339 | page = migration_entry_to_page(entry); | |
1340 | } | |
1341 | #endif | |
1342 | ||
1343 | if (page && page_mapcount(page) == 1) | |
1344 | flags |= PM_MMAP_EXCLUSIVE; | |
356515e7 | 1345 | |
025c5b24 | 1346 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1347 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1348 | |
092b50ba | 1349 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1350 | if (err) |
1351 | break; | |
1c90308e | 1352 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1353 | frame++; |
8753dccb HY |
1354 | else if (flags & PM_SWAP) |
1355 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
5aaabe83 | 1356 | } |
bf929152 | 1357 | spin_unlock(ptl); |
025c5b24 | 1358 | return err; |
5aaabe83 NH |
1359 | } |
1360 | ||
356515e7 | 1361 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1362 | return 0; |
356515e7 | 1363 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1364 | |
f995ece2 NH |
1365 | /* |
1366 | * We can assume that @vma always points to a valid one and @end never | |
1367 | * goes beyond vma->vm_end. | |
1368 | */ | |
356515e7 | 1369 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1370 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1371 | pagemap_entry_t pme; | |
05fbf357 | 1372 | |
deb94544 | 1373 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1374 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1375 | if (err) |
81d0fa62 | 1376 | break; |
85863e47 | 1377 | } |
f995ece2 | 1378 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1379 | |
1380 | cond_resched(); | |
1381 | ||
1382 | return err; | |
1383 | } | |
1384 | ||
1a5cb814 | 1385 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1386 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1387 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1388 | unsigned long addr, unsigned long end, |
1389 | struct mm_walk *walk) | |
5dc37642 | 1390 | { |
5dc37642 | 1391 | struct pagemapread *pm = walk->private; |
f995ece2 | 1392 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1393 | u64 flags = 0, frame = 0; |
5dc37642 | 1394 | int err = 0; |
356515e7 | 1395 | pte_t pte; |
5dc37642 | 1396 | |
f995ece2 | 1397 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1398 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1399 | |
356515e7 KK |
1400 | pte = huge_ptep_get(ptep); |
1401 | if (pte_present(pte)) { | |
1402 | struct page *page = pte_page(pte); | |
1403 | ||
1404 | if (!PageAnon(page)) | |
1405 | flags |= PM_FILE; | |
1406 | ||
77bb499b KK |
1407 | if (page_mapcount(page) == 1) |
1408 | flags |= PM_MMAP_EXCLUSIVE; | |
1409 | ||
356515e7 | 1410 | flags |= PM_PRESENT; |
1c90308e KK |
1411 | if (pm->show_pfn) |
1412 | frame = pte_pfn(pte) + | |
1413 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1414 | } |
1415 | ||
5dc37642 | 1416 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1417 | pagemap_entry_t pme = make_pme(frame, flags); |
1418 | ||
092b50ba | 1419 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1420 | if (err) |
1421 | return err; | |
1c90308e | 1422 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1423 | frame++; |
5dc37642 NH |
1424 | } |
1425 | ||
1426 | cond_resched(); | |
1427 | ||
1428 | return err; | |
1429 | } | |
1a5cb814 | 1430 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1431 | |
85863e47 MM |
1432 | /* |
1433 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1434 | * | |
f16278c6 HR |
1435 | * For each page in the address space, this file contains one 64-bit entry |
1436 | * consisting of the following: | |
1437 | * | |
052fb0d6 | 1438 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1439 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1440 | * Bits 5-54 swap offset if swapped |
deb94544 | 1441 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
77bb499b KK |
1442 | * Bit 56 page exclusively mapped |
1443 | * Bits 57-60 zero | |
052fb0d6 | 1444 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1445 | * Bit 62 page swapped |
1446 | * Bit 63 page present | |
1447 | * | |
1448 | * If the page is not present but in swap, then the PFN contains an | |
1449 | * encoding of the swap file number and the page's offset into the | |
1450 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1451 | * precisely which pages are mapped (or in swap) and comparing mapped |
1452 | * pages between processes. | |
1453 | * | |
1454 | * Efficient users of this interface will use /proc/pid/maps to | |
1455 | * determine which areas of memory are actually mapped and llseek to | |
1456 | * skip over unmapped regions. | |
1457 | */ | |
1458 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1459 | size_t count, loff_t *ppos) | |
1460 | { | |
a06db751 | 1461 | struct mm_struct *mm = file->private_data; |
85863e47 | 1462 | struct pagemapread pm; |
ee1e6ab6 | 1463 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1464 | unsigned long src; |
1465 | unsigned long svpfn; | |
1466 | unsigned long start_vaddr; | |
1467 | unsigned long end_vaddr; | |
a06db751 | 1468 | int ret = 0, copied = 0; |
85863e47 | 1469 | |
388f7934 | 1470 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1471 | goto out; |
1472 | ||
85863e47 MM |
1473 | ret = -EINVAL; |
1474 | /* file position must be aligned */ | |
aae8679b | 1475 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1476 | goto out_mm; |
85863e47 MM |
1477 | |
1478 | ret = 0; | |
08161786 | 1479 | if (!count) |
a06db751 | 1480 | goto out_mm; |
08161786 | 1481 | |
1c90308e KK |
1482 | /* do not disclose physical addresses: attack vector */ |
1483 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1484 | ||
8c829622 | 1485 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
0ee931c4 | 1486 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1487 | ret = -ENOMEM; |
d82ef020 | 1488 | if (!pm.buffer) |
a06db751 | 1489 | goto out_mm; |
85863e47 | 1490 | |
356515e7 | 1491 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1492 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1493 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1494 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1495 | #endif |
5d7e0d2b AM |
1496 | pagemap_walk.mm = mm; |
1497 | pagemap_walk.private = ± | |
1498 | ||
1499 | src = *ppos; | |
1500 | svpfn = src / PM_ENTRY_BYTES; | |
1501 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1502 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1503 | |
1504 | /* watch out for wraparound */ | |
a06db751 | 1505 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1506 | start_vaddr = end_vaddr; |
1507 | ||
1508 | /* | |
1509 | * The odds are that this will stop walking way | |
1510 | * before end_vaddr, because the length of the | |
1511 | * user buffer is tracked in "pm", and the walk | |
1512 | * will stop when we hit the end of the buffer. | |
1513 | */ | |
d82ef020 KH |
1514 | ret = 0; |
1515 | while (count && (start_vaddr < end_vaddr)) { | |
1516 | int len; | |
1517 | unsigned long end; | |
1518 | ||
1519 | pm.pos = 0; | |
ea251c1d | 1520 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1521 | /* overflow ? */ |
1522 | if (end < start_vaddr || end > end_vaddr) | |
1523 | end = end_vaddr; | |
1524 | down_read(&mm->mmap_sem); | |
1525 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1526 | up_read(&mm->mmap_sem); | |
1527 | start_vaddr = end; | |
1528 | ||
1529 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1530 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1531 | ret = -EFAULT; |
a06db751 | 1532 | goto out_free; |
d82ef020 KH |
1533 | } |
1534 | copied += len; | |
1535 | buf += len; | |
1536 | count -= len; | |
85863e47 | 1537 | } |
d82ef020 KH |
1538 | *ppos += copied; |
1539 | if (!ret || ret == PM_END_OF_BUFFER) | |
1540 | ret = copied; | |
1541 | ||
98bc93e5 KM |
1542 | out_free: |
1543 | kfree(pm.buffer); | |
a06db751 KK |
1544 | out_mm: |
1545 | mmput(mm); | |
85863e47 MM |
1546 | out: |
1547 | return ret; | |
1548 | } | |
1549 | ||
541c237c PE |
1550 | static int pagemap_open(struct inode *inode, struct file *file) |
1551 | { | |
a06db751 KK |
1552 | struct mm_struct *mm; |
1553 | ||
a06db751 KK |
1554 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1555 | if (IS_ERR(mm)) | |
1556 | return PTR_ERR(mm); | |
1557 | file->private_data = mm; | |
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | static int pagemap_release(struct inode *inode, struct file *file) | |
1562 | { | |
1563 | struct mm_struct *mm = file->private_data; | |
1564 | ||
1565 | if (mm) | |
1566 | mmdrop(mm); | |
541c237c PE |
1567 | return 0; |
1568 | } | |
1569 | ||
85863e47 MM |
1570 | const struct file_operations proc_pagemap_operations = { |
1571 | .llseek = mem_lseek, /* borrow this */ | |
1572 | .read = pagemap_read, | |
541c237c | 1573 | .open = pagemap_open, |
a06db751 | 1574 | .release = pagemap_release, |
85863e47 | 1575 | }; |
1e883281 | 1576 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1577 | |
6e21c8f1 | 1578 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1579 | |
f69ff943 | 1580 | struct numa_maps { |
f69ff943 SW |
1581 | unsigned long pages; |
1582 | unsigned long anon; | |
1583 | unsigned long active; | |
1584 | unsigned long writeback; | |
1585 | unsigned long mapcount_max; | |
1586 | unsigned long dirty; | |
1587 | unsigned long swapcache; | |
1588 | unsigned long node[MAX_NUMNODES]; | |
1589 | }; | |
1590 | ||
5b52fc89 SW |
1591 | struct numa_maps_private { |
1592 | struct proc_maps_private proc_maps; | |
1593 | struct numa_maps md; | |
1594 | }; | |
1595 | ||
eb4866d0 DH |
1596 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1597 | unsigned long nr_pages) | |
f69ff943 SW |
1598 | { |
1599 | int count = page_mapcount(page); | |
1600 | ||
eb4866d0 | 1601 | md->pages += nr_pages; |
f69ff943 | 1602 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1603 | md->dirty += nr_pages; |
f69ff943 SW |
1604 | |
1605 | if (PageSwapCache(page)) | |
eb4866d0 | 1606 | md->swapcache += nr_pages; |
f69ff943 SW |
1607 | |
1608 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1609 | md->active += nr_pages; |
f69ff943 SW |
1610 | |
1611 | if (PageWriteback(page)) | |
eb4866d0 | 1612 | md->writeback += nr_pages; |
f69ff943 SW |
1613 | |
1614 | if (PageAnon(page)) | |
eb4866d0 | 1615 | md->anon += nr_pages; |
f69ff943 SW |
1616 | |
1617 | if (count > md->mapcount_max) | |
1618 | md->mapcount_max = count; | |
1619 | ||
eb4866d0 | 1620 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1621 | } |
1622 | ||
3200a8aa DH |
1623 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1624 | unsigned long addr) | |
1625 | { | |
1626 | struct page *page; | |
1627 | int nid; | |
1628 | ||
1629 | if (!pte_present(pte)) | |
1630 | return NULL; | |
1631 | ||
1632 | page = vm_normal_page(vma, addr, pte); | |
1633 | if (!page) | |
1634 | return NULL; | |
1635 | ||
1636 | if (PageReserved(page)) | |
1637 | return NULL; | |
1638 | ||
1639 | nid = page_to_nid(page); | |
4ff1b2c2 | 1640 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1641 | return NULL; |
1642 | ||
1643 | return page; | |
1644 | } | |
1645 | ||
28093f9f GS |
1646 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1647 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1648 | struct vm_area_struct *vma, | |
1649 | unsigned long addr) | |
1650 | { | |
1651 | struct page *page; | |
1652 | int nid; | |
1653 | ||
1654 | if (!pmd_present(pmd)) | |
1655 | return NULL; | |
1656 | ||
1657 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1658 | if (!page) | |
1659 | return NULL; | |
1660 | ||
1661 | if (PageReserved(page)) | |
1662 | return NULL; | |
1663 | ||
1664 | nid = page_to_nid(page); | |
1665 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1666 | return NULL; | |
1667 | ||
1668 | return page; | |
1669 | } | |
1670 | #endif | |
1671 | ||
f69ff943 SW |
1672 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1673 | unsigned long end, struct mm_walk *walk) | |
1674 | { | |
d85f4d6d NH |
1675 | struct numa_maps *md = walk->private; |
1676 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1677 | spinlock_t *ptl; |
1678 | pte_t *orig_pte; | |
1679 | pte_t *pte; | |
1680 | ||
28093f9f | 1681 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1682 | ptl = pmd_trans_huge_lock(pmd, vma); |
1683 | if (ptl) { | |
025c5b24 NH |
1684 | struct page *page; |
1685 | ||
28093f9f | 1686 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1687 | if (page) |
28093f9f | 1688 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1689 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1690 | spin_unlock(ptl); |
025c5b24 | 1691 | return 0; |
32ef4384 DH |
1692 | } |
1693 | ||
1a5a9906 AA |
1694 | if (pmd_trans_unstable(pmd)) |
1695 | return 0; | |
28093f9f | 1696 | #endif |
f69ff943 SW |
1697 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1698 | do { | |
d85f4d6d | 1699 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1700 | if (!page) |
1701 | continue; | |
eb4866d0 | 1702 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1703 | |
1704 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1705 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1706 | cond_resched(); |
f69ff943 SW |
1707 | return 0; |
1708 | } | |
1709 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1710 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1711 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1712 | { | |
5c2ff95e | 1713 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1714 | struct numa_maps *md; |
1715 | struct page *page; | |
1716 | ||
5c2ff95e | 1717 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1718 | return 0; |
1719 | ||
5c2ff95e | 1720 | page = pte_page(huge_pte); |
f69ff943 SW |
1721 | if (!page) |
1722 | return 0; | |
1723 | ||
1724 | md = walk->private; | |
5c2ff95e | 1725 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1726 | return 0; |
1727 | } | |
1728 | ||
1729 | #else | |
632fd60f | 1730 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1731 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1732 | { | |
1733 | return 0; | |
1734 | } | |
1735 | #endif | |
1736 | ||
1737 | /* | |
1738 | * Display pages allocated per node and memory policy via /proc. | |
1739 | */ | |
b7643757 | 1740 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1741 | { |
5b52fc89 SW |
1742 | struct numa_maps_private *numa_priv = m->private; |
1743 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1744 | struct vm_area_struct *vma = v; |
5b52fc89 | 1745 | struct numa_maps *md = &numa_priv->md; |
c088e31d | 1746 | struct file *file = vma_pr_or_file(vma); |
f69ff943 | 1747 | struct mm_struct *mm = vma->vm_mm; |
d85f4d6d NH |
1748 | struct mm_walk walk = { |
1749 | .hugetlb_entry = gather_hugetlb_stats, | |
1750 | .pmd_entry = gather_pte_stats, | |
1751 | .private = md, | |
1752 | .mm = mm, | |
1753 | }; | |
f69ff943 | 1754 | struct mempolicy *pol; |
948927ee DR |
1755 | char buffer[64]; |
1756 | int nid; | |
f69ff943 SW |
1757 | |
1758 | if (!mm) | |
1759 | return 0; | |
1760 | ||
5b52fc89 SW |
1761 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1762 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1763 | |
498f2371 ON |
1764 | pol = __get_vma_policy(vma, vma->vm_start); |
1765 | if (pol) { | |
1766 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1767 | mpol_cond_put(pol); | |
1768 | } else { | |
1769 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1770 | } | |
f69ff943 SW |
1771 | |
1772 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1773 | ||
1774 | if (file) { | |
17c2b4ee | 1775 | seq_puts(m, " file="); |
2726d566 | 1776 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1777 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1778 | seq_puts(m, " heap"); |
1240ea0d | 1779 | } else if (is_stack(vma)) { |
65376df5 | 1780 | seq_puts(m, " stack"); |
f69ff943 SW |
1781 | } |
1782 | ||
fc360bd9 | 1783 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1784 | seq_puts(m, " huge"); |
fc360bd9 | 1785 | |
d85f4d6d NH |
1786 | /* mmap_sem is held by m_start */ |
1787 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1788 | |
1789 | if (!md->pages) | |
1790 | goto out; | |
1791 | ||
1792 | if (md->anon) | |
1793 | seq_printf(m, " anon=%lu", md->anon); | |
1794 | ||
1795 | if (md->dirty) | |
1796 | seq_printf(m, " dirty=%lu", md->dirty); | |
1797 | ||
1798 | if (md->pages != md->anon && md->pages != md->dirty) | |
1799 | seq_printf(m, " mapped=%lu", md->pages); | |
1800 | ||
1801 | if (md->mapcount_max > 1) | |
1802 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1803 | ||
1804 | if (md->swapcache) | |
1805 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1806 | ||
1807 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1808 | seq_printf(m, " active=%lu", md->active); | |
1809 | ||
1810 | if (md->writeback) | |
1811 | seq_printf(m, " writeback=%lu", md->writeback); | |
1812 | ||
948927ee DR |
1813 | for_each_node_state(nid, N_MEMORY) |
1814 | if (md->node[nid]) | |
1815 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1816 | |
1817 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1818 | out: |
1819 | seq_putc(m, '\n'); | |
b8c20a9b | 1820 | m_cache_vma(m, vma); |
f69ff943 SW |
1821 | return 0; |
1822 | } | |
5b52fc89 | 1823 | |
b7643757 SP |
1824 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1825 | { | |
1826 | return show_numa_map(m, v, 1); | |
1827 | } | |
1828 | ||
1829 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1830 | { | |
1831 | return show_numa_map(m, v, 0); | |
1832 | } | |
1833 | ||
03a44825 | 1834 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1835 | .start = m_start, |
1836 | .next = m_next, | |
1837 | .stop = m_stop, | |
1838 | .show = show_pid_numa_map, | |
6e21c8f1 | 1839 | }; |
662795de | 1840 | |
b7643757 SP |
1841 | static const struct seq_operations proc_tid_numa_maps_op = { |
1842 | .start = m_start, | |
1843 | .next = m_next, | |
1844 | .stop = m_stop, | |
1845 | .show = show_tid_numa_map, | |
1846 | }; | |
1847 | ||
1848 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1849 | const struct seq_operations *ops) | |
662795de | 1850 | { |
4db7d0ee ON |
1851 | return proc_maps_open(inode, file, ops, |
1852 | sizeof(struct numa_maps_private)); | |
662795de EB |
1853 | } |
1854 | ||
b7643757 SP |
1855 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1856 | { | |
1857 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1858 | } | |
1859 | ||
1860 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1861 | { | |
1862 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1863 | } | |
1864 | ||
1865 | const struct file_operations proc_pid_numa_maps_operations = { | |
1866 | .open = pid_numa_maps_open, | |
1867 | .read = seq_read, | |
1868 | .llseek = seq_lseek, | |
29a40ace | 1869 | .release = proc_map_release, |
b7643757 SP |
1870 | }; |
1871 | ||
1872 | const struct file_operations proc_tid_numa_maps_operations = { | |
1873 | .open = tid_numa_maps_open, | |
662795de EB |
1874 | .read = seq_read, |
1875 | .llseek = seq_lseek, | |
29a40ace | 1876 | .release = proc_map_release, |
662795de | 1877 | }; |
f69ff943 | 1878 | #endif /* CONFIG_NUMA */ |