Commit | Line | Data |
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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> |
27cca866 | 21 | #include <linux/pkeys.h> |
e070ad49 | 22 | |
1da177e4 | 23 | #include <asm/elf.h> |
b3a81d08 | 24 | #include <asm/tlb.h> |
e070ad49 | 25 | #include <asm/tlbflush.h> |
1da177e4 LT |
26 | #include "internal.h" |
27 | ||
d1be35cb AV |
28 | #define SEQ_PUT_DEC(str, val) \ |
29 | seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) | |
df5f8314 | 30 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 31 | { |
af5b0f6a | 32 | unsigned long text, lib, swap, anon, file, shmem; |
365e9c87 HD |
33 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
34 | ||
8cee852e JM |
35 | anon = get_mm_counter(mm, MM_ANONPAGES); |
36 | file = get_mm_counter(mm, MM_FILEPAGES); | |
37 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
38 | ||
365e9c87 HD |
39 | /* |
40 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
41 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
42 | * collector of these hiwater stats must therefore get total_vm | |
43 | * and rss too, which will usually be the higher. Barriers? not | |
44 | * worth the effort, such snapshots can always be inconsistent. | |
45 | */ | |
46 | hiwater_vm = total_vm = mm->total_vm; | |
47 | if (hiwater_vm < mm->hiwater_vm) | |
48 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 49 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
50 | if (hiwater_rss < mm->hiwater_rss) |
51 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 52 | |
8526d84f KK |
53 | /* split executable areas between text and lib */ |
54 | text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK); | |
55 | text = min(text, mm->exec_vm << PAGE_SHIFT); | |
56 | lib = (mm->exec_vm << PAGE_SHIFT) - text; | |
57 | ||
b084d435 | 58 | swap = get_mm_counter(mm, MM_SWAPENTS); |
d1be35cb AV |
59 | SEQ_PUT_DEC("VmPeak:\t", hiwater_vm); |
60 | SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm); | |
61 | SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm); | |
70f8a3ca | 62 | SEQ_PUT_DEC(" kB\nVmPin:\t", atomic64_read(&mm->pinned_vm)); |
d1be35cb AV |
63 | SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss); |
64 | SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss); | |
65 | SEQ_PUT_DEC(" kB\nRssAnon:\t", anon); | |
66 | SEQ_PUT_DEC(" kB\nRssFile:\t", file); | |
67 | SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem); | |
68 | SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm); | |
69 | SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm); | |
70 | seq_put_decimal_ull_width(m, | |
71 | " kB\nVmExe:\t", text >> 10, 8); | |
72 | seq_put_decimal_ull_width(m, | |
73 | " kB\nVmLib:\t", lib >> 10, 8); | |
74 | seq_put_decimal_ull_width(m, | |
75 | " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8); | |
76 | SEQ_PUT_DEC(" kB\nVmSwap:\t", swap); | |
77 | seq_puts(m, " kB\n"); | |
5d317b2b | 78 | hugetlb_report_usage(m, mm); |
1da177e4 | 79 | } |
d1be35cb | 80 | #undef SEQ_PUT_DEC |
1da177e4 LT |
81 | |
82 | unsigned long task_vsize(struct mm_struct *mm) | |
83 | { | |
84 | return PAGE_SIZE * mm->total_vm; | |
85 | } | |
86 | ||
a2ade7b6 AD |
87 | unsigned long task_statm(struct mm_struct *mm, |
88 | unsigned long *shared, unsigned long *text, | |
89 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 90 | { |
eca56ff9 JM |
91 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
92 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
93 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
94 | >> PAGE_SHIFT; | |
84638335 | 95 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 96 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
97 | return mm->total_vm; |
98 | } | |
99 | ||
9e781440 KH |
100 | #ifdef CONFIG_NUMA |
101 | /* | |
498f2371 | 102 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
103 | */ |
104 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
105 | { | |
106 | struct task_struct *task = priv->task; | |
107 | ||
108 | task_lock(task); | |
498f2371 | 109 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
110 | mpol_get(priv->task_mempolicy); |
111 | task_unlock(task); | |
112 | } | |
113 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
114 | { | |
115 | mpol_put(priv->task_mempolicy); | |
116 | } | |
117 | #else | |
118 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
119 | { | |
120 | } | |
121 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
122 | { | |
123 | } | |
124 | #endif | |
125 | ||
59b4bf12 | 126 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 127 | { |
59b4bf12 ON |
128 | struct mm_struct *mm = priv->mm; |
129 | ||
130 | release_task_mempolicy(priv); | |
131 | up_read(&mm->mmap_sem); | |
132 | mmput(mm); | |
a6198797 | 133 | } |
ec4dd3eb | 134 | |
ad2a00e4 ON |
135 | static struct vm_area_struct * |
136 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
137 | { | |
138 | if (vma == priv->tail_vma) | |
139 | return NULL; | |
140 | return vma->vm_next ?: priv->tail_vma; | |
141 | } | |
142 | ||
b8c20a9b ON |
143 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
144 | { | |
145 | if (m->count < m->size) /* vma is copied successfully */ | |
855af072 | 146 | m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL; |
b8c20a9b ON |
147 | } |
148 | ||
0c255321 | 149 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 150 | { |
a6198797 | 151 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 152 | unsigned long last_addr = m->version; |
a6198797 | 153 | struct mm_struct *mm; |
0c255321 ON |
154 | struct vm_area_struct *vma; |
155 | unsigned int pos = *ppos; | |
a6198797 | 156 | |
b8c20a9b ON |
157 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
158 | if (last_addr == -1UL) | |
159 | return NULL; | |
160 | ||
2c03376d | 161 | priv->task = get_proc_task(priv->inode); |
a6198797 | 162 | if (!priv->task) |
ec6fd8a4 | 163 | return ERR_PTR(-ESRCH); |
a6198797 | 164 | |
29a40ace | 165 | mm = priv->mm; |
388f7934 | 166 | if (!mm || !mmget_not_zero(mm)) |
29a40ace | 167 | return NULL; |
a6198797 | 168 | |
0c255321 | 169 | down_read(&mm->mmap_sem); |
9e781440 | 170 | hold_task_mempolicy(priv); |
0c255321 | 171 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 172 | |
b8c20a9b | 173 | if (last_addr) { |
855af072 RH |
174 | vma = find_vma(mm, last_addr - 1); |
175 | if (vma && vma->vm_start <= last_addr) | |
176 | vma = m_next_vma(priv, vma); | |
177 | if (vma) | |
b8c20a9b ON |
178 | return vma; |
179 | } | |
180 | ||
181 | m->version = 0; | |
0c255321 | 182 | if (pos < mm->map_count) { |
557c2d8a ON |
183 | for (vma = mm->mmap; pos; pos--) { |
184 | m->version = vma->vm_start; | |
a6198797 | 185 | vma = vma->vm_next; |
557c2d8a | 186 | } |
a6198797 | 187 | return vma; |
0c255321 | 188 | } |
a6198797 | 189 | |
557c2d8a | 190 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
191 | if (pos == mm->map_count && priv->tail_vma) |
192 | return priv->tail_vma; | |
59b4bf12 ON |
193 | |
194 | vma_stop(priv); | |
195 | return NULL; | |
a6198797 MM |
196 | } |
197 | ||
198 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
199 | { | |
200 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 201 | struct vm_area_struct *next; |
a6198797 MM |
202 | |
203 | (*pos)++; | |
ad2a00e4 | 204 | next = m_next_vma(priv, v); |
59b4bf12 ON |
205 | if (!next) |
206 | vma_stop(priv); | |
207 | return next; | |
a6198797 MM |
208 | } |
209 | ||
210 | static void m_stop(struct seq_file *m, void *v) | |
211 | { | |
212 | struct proc_maps_private *priv = m->private; | |
a6198797 | 213 | |
59b4bf12 ON |
214 | if (!IS_ERR_OR_NULL(v)) |
215 | vma_stop(priv); | |
0d5f5f45 | 216 | if (priv->task) { |
a6198797 | 217 | put_task_struct(priv->task); |
0d5f5f45 ON |
218 | priv->task = NULL; |
219 | } | |
a6198797 MM |
220 | } |
221 | ||
4db7d0ee ON |
222 | static int proc_maps_open(struct inode *inode, struct file *file, |
223 | const struct seq_operations *ops, int psize) | |
224 | { | |
225 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
226 | ||
227 | if (!priv) | |
228 | return -ENOMEM; | |
229 | ||
2c03376d | 230 | priv->inode = inode; |
29a40ace ON |
231 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
232 | if (IS_ERR(priv->mm)) { | |
233 | int err = PTR_ERR(priv->mm); | |
234 | ||
235 | seq_release_private(inode, file); | |
236 | return err; | |
237 | } | |
238 | ||
4db7d0ee ON |
239 | return 0; |
240 | } | |
241 | ||
29a40ace ON |
242 | static int proc_map_release(struct inode *inode, struct file *file) |
243 | { | |
244 | struct seq_file *seq = file->private_data; | |
245 | struct proc_maps_private *priv = seq->private; | |
246 | ||
247 | if (priv->mm) | |
248 | mmdrop(priv->mm); | |
249 | ||
250 | return seq_release_private(inode, file); | |
251 | } | |
252 | ||
a6198797 | 253 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 254 | const struct seq_operations *ops) |
a6198797 | 255 | { |
4db7d0ee ON |
256 | return proc_maps_open(inode, file, ops, |
257 | sizeof(struct proc_maps_private)); | |
a6198797 | 258 | } |
e070ad49 | 259 | |
65376df5 JW |
260 | /* |
261 | * Indicate if the VMA is a stack for the given task; for | |
262 | * /proc/PID/maps that is the stack of the main task. | |
263 | */ | |
1240ea0d | 264 | static int is_stack(struct vm_area_struct *vma) |
58cb6548 | 265 | { |
b18cb64e AL |
266 | /* |
267 | * We make no effort to guess what a given thread considers to be | |
268 | * its "stack". It's not even well-defined for programs written | |
269 | * languages like Go. | |
270 | */ | |
271 | return vma->vm_start <= vma->vm_mm->start_stack && | |
272 | vma->vm_end >= vma->vm_mm->start_stack; | |
58cb6548 ON |
273 | } |
274 | ||
493b0e9d DC |
275 | static void show_vma_header_prefix(struct seq_file *m, |
276 | unsigned long start, unsigned long end, | |
277 | vm_flags_t flags, unsigned long long pgoff, | |
278 | dev_t dev, unsigned long ino) | |
279 | { | |
280 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
0e3dc019 AV |
281 | seq_put_hex_ll(m, NULL, start, 8); |
282 | seq_put_hex_ll(m, "-", end, 8); | |
283 | seq_putc(m, ' '); | |
284 | seq_putc(m, flags & VM_READ ? 'r' : '-'); | |
285 | seq_putc(m, flags & VM_WRITE ? 'w' : '-'); | |
286 | seq_putc(m, flags & VM_EXEC ? 'x' : '-'); | |
287 | seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p'); | |
288 | seq_put_hex_ll(m, " ", pgoff, 8); | |
289 | seq_put_hex_ll(m, " ", MAJOR(dev), 2); | |
290 | seq_put_hex_ll(m, ":", MINOR(dev), 2); | |
291 | seq_put_decimal_ull(m, " ", ino); | |
292 | seq_putc(m, ' '); | |
493b0e9d DC |
293 | } |
294 | ||
b7643757 | 295 | static void |
871305bb | 296 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
1da177e4 | 297 | { |
e070ad49 ML |
298 | struct mm_struct *mm = vma->vm_mm; |
299 | struct file *file = vma->vm_file; | |
ca16d140 | 300 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 301 | unsigned long ino = 0; |
6260a4b0 | 302 | unsigned long long pgoff = 0; |
a09a79f6 | 303 | unsigned long start, end; |
1da177e4 | 304 | dev_t dev = 0; |
b7643757 | 305 | const char *name = NULL; |
1da177e4 LT |
306 | |
307 | if (file) { | |
496ad9aa | 308 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
309 | dev = inode->i_sb->s_dev; |
310 | ino = inode->i_ino; | |
6260a4b0 | 311 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
312 | } |
313 | ||
d7824370 | 314 | start = vma->vm_start; |
a09a79f6 | 315 | end = vma->vm_end; |
493b0e9d | 316 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
1da177e4 LT |
317 | |
318 | /* | |
319 | * Print the dentry name for named mappings, and a | |
320 | * special [heap] marker for the heap: | |
321 | */ | |
e070ad49 | 322 | if (file) { |
652586df | 323 | seq_pad(m, ' '); |
2726d566 | 324 | seq_file_path(m, file, "\n"); |
b7643757 SP |
325 | goto done; |
326 | } | |
327 | ||
78d683e8 AL |
328 | if (vma->vm_ops && vma->vm_ops->name) { |
329 | name = vma->vm_ops->name(vma); | |
330 | if (name) | |
331 | goto done; | |
332 | } | |
333 | ||
b7643757 SP |
334 | name = arch_vma_name(vma); |
335 | if (!name) { | |
b7643757 SP |
336 | if (!mm) { |
337 | name = "[vdso]"; | |
338 | goto done; | |
339 | } | |
340 | ||
341 | if (vma->vm_start <= mm->brk && | |
342 | vma->vm_end >= mm->start_brk) { | |
343 | name = "[heap]"; | |
344 | goto done; | |
345 | } | |
346 | ||
1240ea0d | 347 | if (is_stack(vma)) |
65376df5 | 348 | name = "[stack]"; |
b7643757 SP |
349 | } |
350 | ||
351 | done: | |
352 | if (name) { | |
652586df | 353 | seq_pad(m, ' '); |
b7643757 | 354 | seq_puts(m, name); |
1da177e4 LT |
355 | } |
356 | seq_putc(m, '\n'); | |
7c88db0c JK |
357 | } |
358 | ||
871305bb | 359 | static int show_map(struct seq_file *m, void *v) |
7c88db0c | 360 | { |
871305bb | 361 | show_map_vma(m, v); |
b8c20a9b | 362 | m_cache_vma(m, v); |
1da177e4 LT |
363 | return 0; |
364 | } | |
365 | ||
03a44825 | 366 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
367 | .start = m_start, |
368 | .next = m_next, | |
369 | .stop = m_stop, | |
871305bb | 370 | .show = show_map |
a6198797 MM |
371 | }; |
372 | ||
b7643757 | 373 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
374 | { |
375 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
376 | } | |
377 | ||
b7643757 SP |
378 | const struct file_operations proc_pid_maps_operations = { |
379 | .open = pid_maps_open, | |
380 | .read = seq_read, | |
381 | .llseek = seq_lseek, | |
29a40ace | 382 | .release = proc_map_release, |
b7643757 SP |
383 | }; |
384 | ||
a6198797 MM |
385 | /* |
386 | * Proportional Set Size(PSS): my share of RSS. | |
387 | * | |
388 | * PSS of a process is the count of pages it has in memory, where each | |
389 | * page is divided by the number of processes sharing it. So if a | |
390 | * process has 1000 pages all to itself, and 1000 shared with one other | |
391 | * process, its PSS will be 1500. | |
392 | * | |
393 | * To keep (accumulated) division errors low, we adopt a 64bit | |
394 | * fixed-point pss counter to minimize division errors. So (pss >> | |
395 | * PSS_SHIFT) would be the real byte count. | |
396 | * | |
397 | * A shift of 12 before division means (assuming 4K page size): | |
398 | * - 1M 3-user-pages add up to 8KB errors; | |
399 | * - supports mapcount up to 2^24, or 16M; | |
400 | * - supports PSS up to 2^52 bytes, or 4PB. | |
401 | */ | |
402 | #define PSS_SHIFT 12 | |
403 | ||
1e883281 | 404 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 405 | struct mem_size_stats { |
a6198797 MM |
406 | unsigned long resident; |
407 | unsigned long shared_clean; | |
408 | unsigned long shared_dirty; | |
409 | unsigned long private_clean; | |
410 | unsigned long private_dirty; | |
411 | unsigned long referenced; | |
b40d4f84 | 412 | unsigned long anonymous; |
cf8496ea | 413 | unsigned long lazyfree; |
4031a219 | 414 | unsigned long anonymous_thp; |
65c45377 | 415 | unsigned long shmem_thp; |
214e471f | 416 | unsigned long swap; |
25ee01a2 NH |
417 | unsigned long shared_hugetlb; |
418 | unsigned long private_hugetlb; | |
a6198797 | 419 | u64 pss; |
493b0e9d | 420 | u64 pss_locked; |
8334b962 | 421 | u64 swap_pss; |
c261e7d9 | 422 | bool check_shmem_swap; |
a6198797 MM |
423 | }; |
424 | ||
c164e038 | 425 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
27dd768e | 426 | bool compound, bool young, bool dirty, bool locked) |
c164e038 | 427 | { |
f4be6153 | 428 | int i, nr = compound ? 1 << compound_order(page) : 1; |
afd9883f | 429 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 430 | |
cf8496ea | 431 | if (PageAnon(page)) { |
c164e038 | 432 | mss->anonymous += size; |
cf8496ea SL |
433 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
434 | mss->lazyfree += size; | |
435 | } | |
c164e038 KS |
436 | |
437 | mss->resident += size; | |
438 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 439 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 440 | mss->referenced += size; |
c164e038 | 441 | |
afd9883f KS |
442 | /* |
443 | * page_count(page) == 1 guarantees the page is mapped exactly once. | |
444 | * If any subpage of the compound page mapped with PTE it would elevate | |
445 | * page_count(). | |
446 | */ | |
447 | if (page_count(page) == 1) { | |
c164e038 KS |
448 | if (dirty || PageDirty(page)) |
449 | mss->private_dirty += size; | |
450 | else | |
451 | mss->private_clean += size; | |
452 | mss->pss += (u64)size << PSS_SHIFT; | |
27dd768e SP |
453 | if (locked) |
454 | mss->pss_locked += (u64)size << PSS_SHIFT; | |
afd9883f KS |
455 | return; |
456 | } | |
457 | ||
458 | for (i = 0; i < nr; i++, page++) { | |
459 | int mapcount = page_mapcount(page); | |
27dd768e | 460 | unsigned long pss = (PAGE_SIZE << PSS_SHIFT); |
afd9883f KS |
461 | |
462 | if (mapcount >= 2) { | |
463 | if (dirty || PageDirty(page)) | |
464 | mss->shared_dirty += PAGE_SIZE; | |
465 | else | |
466 | mss->shared_clean += PAGE_SIZE; | |
27dd768e SP |
467 | mss->pss += pss / mapcount; |
468 | if (locked) | |
469 | mss->pss_locked += pss / mapcount; | |
afd9883f KS |
470 | } else { |
471 | if (dirty || PageDirty(page)) | |
472 | mss->private_dirty += PAGE_SIZE; | |
473 | else | |
474 | mss->private_clean += PAGE_SIZE; | |
27dd768e SP |
475 | mss->pss += pss; |
476 | if (locked) | |
477 | mss->pss_locked += pss; | |
afd9883f | 478 | } |
c164e038 KS |
479 | } |
480 | } | |
ae11c4d9 | 481 | |
c261e7d9 | 482 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
483 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
484 | struct mm_walk *walk) | |
485 | { | |
486 | struct mem_size_stats *mss = walk->private; | |
487 | ||
48131e03 VB |
488 | mss->swap += shmem_partial_swap_usage( |
489 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
490 | |
491 | return 0; | |
492 | } | |
c261e7d9 VB |
493 | #endif |
494 | ||
c164e038 KS |
495 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
496 | struct mm_walk *walk) | |
ae11c4d9 DH |
497 | { |
498 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 499 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 500 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
b1d4d9e0 | 501 | struct page *page = NULL; |
ae11c4d9 | 502 | |
c164e038 KS |
503 | if (pte_present(*pte)) { |
504 | page = vm_normal_page(vma, addr, *pte); | |
505 | } else if (is_swap_pte(*pte)) { | |
506 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 507 | |
8334b962 MK |
508 | if (!non_swap_entry(swpent)) { |
509 | int mapcount; | |
510 | ||
c164e038 | 511 | mss->swap += PAGE_SIZE; |
8334b962 MK |
512 | mapcount = swp_swapcount(swpent); |
513 | if (mapcount >= 2) { | |
514 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
515 | ||
516 | do_div(pss_delta, mapcount); | |
517 | mss->swap_pss += pss_delta; | |
518 | } else { | |
519 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
520 | } | |
521 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 522 | page = migration_entry_to_page(swpent); |
5042db43 JG |
523 | else if (is_device_private_entry(swpent)) |
524 | page = device_private_entry_to_page(swpent); | |
c261e7d9 VB |
525 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
526 | && pte_none(*pte))) { | |
48131e03 VB |
527 | page = find_get_entry(vma->vm_file->f_mapping, |
528 | linear_page_index(vma, addr)); | |
529 | if (!page) | |
530 | return; | |
531 | ||
3159f943 | 532 | if (xa_is_value(page)) |
48131e03 VB |
533 | mss->swap += PAGE_SIZE; |
534 | else | |
09cbfeaf | 535 | put_page(page); |
48131e03 VB |
536 | |
537 | return; | |
b1d4d9e0 | 538 | } |
ae11c4d9 | 539 | |
ae11c4d9 DH |
540 | if (!page) |
541 | return; | |
afd9883f | 542 | |
27dd768e | 543 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte), locked); |
ae11c4d9 DH |
544 | } |
545 | ||
c164e038 KS |
546 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
547 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
548 | struct mm_walk *walk) | |
549 | { | |
550 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 551 | struct vm_area_struct *vma = walk->vma; |
27dd768e | 552 | bool locked = !!(vma->vm_flags & VM_LOCKED); |
c164e038 KS |
553 | struct page *page; |
554 | ||
555 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
556 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
557 | if (IS_ERR_OR_NULL(page)) | |
558 | return; | |
65c45377 KS |
559 | if (PageAnon(page)) |
560 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
561 | else if (PageSwapBacked(page)) | |
562 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
563 | else if (is_zone_device_page(page)) |
564 | /* pass */; | |
65c45377 KS |
565 | else |
566 | VM_BUG_ON_PAGE(1, page); | |
27dd768e | 567 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd), locked); |
c164e038 KS |
568 | } |
569 | #else | |
570 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
571 | struct mm_walk *walk) | |
572 | { | |
573 | } | |
574 | #endif | |
575 | ||
b3ae5acb | 576 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 577 | struct mm_walk *walk) |
e070ad49 | 578 | { |
14eb6fdd | 579 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 580 | pte_t *pte; |
705e87c0 | 581 | spinlock_t *ptl; |
e070ad49 | 582 | |
b6ec57f4 KS |
583 | ptl = pmd_trans_huge_lock(pmd, vma); |
584 | if (ptl) { | |
84c3fc4e ZY |
585 | if (pmd_present(*pmd)) |
586 | smaps_pmd_entry(pmd, addr, walk); | |
bf929152 | 587 | spin_unlock(ptl); |
14038302 | 588 | goto out; |
22e057c5 | 589 | } |
1a5a9906 AA |
590 | |
591 | if (pmd_trans_unstable(pmd)) | |
14038302 | 592 | goto out; |
22e057c5 DH |
593 | /* |
594 | * The mmap_sem held all the way back in m_start() is what | |
595 | * keeps khugepaged out of here and from collapsing things | |
596 | * in here. | |
597 | */ | |
705e87c0 | 598 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 599 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 600 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 601 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 602 | out: |
705e87c0 | 603 | cond_resched(); |
b3ae5acb | 604 | return 0; |
e070ad49 ML |
605 | } |
606 | ||
834f82e2 CG |
607 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
608 | { | |
609 | /* | |
610 | * Don't forget to update Documentation/ on changes. | |
611 | */ | |
612 | static const char mnemonics[BITS_PER_LONG][2] = { | |
613 | /* | |
614 | * In case if we meet a flag we don't know about. | |
615 | */ | |
616 | [0 ... (BITS_PER_LONG-1)] = "??", | |
617 | ||
618 | [ilog2(VM_READ)] = "rd", | |
619 | [ilog2(VM_WRITE)] = "wr", | |
620 | [ilog2(VM_EXEC)] = "ex", | |
621 | [ilog2(VM_SHARED)] = "sh", | |
622 | [ilog2(VM_MAYREAD)] = "mr", | |
623 | [ilog2(VM_MAYWRITE)] = "mw", | |
624 | [ilog2(VM_MAYEXEC)] = "me", | |
625 | [ilog2(VM_MAYSHARE)] = "ms", | |
626 | [ilog2(VM_GROWSDOWN)] = "gd", | |
627 | [ilog2(VM_PFNMAP)] = "pf", | |
628 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
629 | #ifdef CONFIG_X86_INTEL_MPX |
630 | [ilog2(VM_MPX)] = "mp", | |
631 | #endif | |
834f82e2 CG |
632 | [ilog2(VM_LOCKED)] = "lo", |
633 | [ilog2(VM_IO)] = "io", | |
634 | [ilog2(VM_SEQ_READ)] = "sr", | |
635 | [ilog2(VM_RAND_READ)] = "rr", | |
636 | [ilog2(VM_DONTCOPY)] = "dc", | |
637 | [ilog2(VM_DONTEXPAND)] = "de", | |
638 | [ilog2(VM_ACCOUNT)] = "ac", | |
639 | [ilog2(VM_NORESERVE)] = "nr", | |
640 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 641 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 642 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 643 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 644 | [ilog2(VM_DONTDUMP)] = "dd", |
ec8e41ae NH |
645 | #ifdef CONFIG_MEM_SOFT_DIRTY |
646 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
647 | #endif | |
834f82e2 CG |
648 | [ilog2(VM_MIXEDMAP)] = "mm", |
649 | [ilog2(VM_HUGEPAGE)] = "hg", | |
650 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
651 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
652 | [ilog2(VM_UFFD_MISSING)]= "um", |
653 | [ilog2(VM_UFFD_WP)] = "uw", | |
5212213a | 654 | #ifdef CONFIG_ARCH_HAS_PKEYS |
c1192f84 DH |
655 | /* These come out via ProtectionKey: */ |
656 | [ilog2(VM_PKEY_BIT0)] = "", | |
657 | [ilog2(VM_PKEY_BIT1)] = "", | |
658 | [ilog2(VM_PKEY_BIT2)] = "", | |
659 | [ilog2(VM_PKEY_BIT3)] = "", | |
2c9e0a6f RP |
660 | #if VM_PKEY_BIT4 |
661 | [ilog2(VM_PKEY_BIT4)] = "", | |
c1192f84 | 662 | #endif |
5212213a | 663 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
834f82e2 CG |
664 | }; |
665 | size_t i; | |
666 | ||
667 | seq_puts(m, "VmFlags: "); | |
668 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
669 | if (!mnemonics[i][0]) |
670 | continue; | |
834f82e2 | 671 | if (vma->vm_flags & (1UL << i)) { |
f6640663 AV |
672 | seq_putc(m, mnemonics[i][0]); |
673 | seq_putc(m, mnemonics[i][1]); | |
674 | seq_putc(m, ' '); | |
834f82e2 CG |
675 | } |
676 | } | |
677 | seq_putc(m, '\n'); | |
678 | } | |
679 | ||
25ee01a2 NH |
680 | #ifdef CONFIG_HUGETLB_PAGE |
681 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
682 | unsigned long addr, unsigned long end, | |
683 | struct mm_walk *walk) | |
684 | { | |
685 | struct mem_size_stats *mss = walk->private; | |
686 | struct vm_area_struct *vma = walk->vma; | |
687 | struct page *page = NULL; | |
688 | ||
689 | if (pte_present(*pte)) { | |
690 | page = vm_normal_page(vma, addr, *pte); | |
691 | } else if (is_swap_pte(*pte)) { | |
692 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
693 | ||
694 | if (is_migration_entry(swpent)) | |
695 | page = migration_entry_to_page(swpent); | |
5042db43 JG |
696 | else if (is_device_private_entry(swpent)) |
697 | page = device_private_entry_to_page(swpent); | |
25ee01a2 NH |
698 | } |
699 | if (page) { | |
700 | int mapcount = page_mapcount(page); | |
701 | ||
702 | if (mapcount >= 2) | |
703 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
704 | else | |
705 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
706 | } | |
707 | return 0; | |
708 | } | |
709 | #endif /* HUGETLB_PAGE */ | |
710 | ||
8e68d689 VB |
711 | static void smap_gather_stats(struct vm_area_struct *vma, |
712 | struct mem_size_stats *mss) | |
e070ad49 | 713 | { |
2165009b DH |
714 | struct mm_walk smaps_walk = { |
715 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
716 | #ifdef CONFIG_HUGETLB_PAGE |
717 | .hugetlb_entry = smaps_hugetlb_range, | |
718 | #endif | |
2165009b | 719 | .mm = vma->vm_mm, |
2165009b | 720 | }; |
e070ad49 | 721 | |
493b0e9d | 722 | smaps_walk.private = mss; |
c261e7d9 VB |
723 | |
724 | #ifdef CONFIG_SHMEM | |
fa76da46 VB |
725 | /* In case of smaps_rollup, reset the value from previous vma */ |
726 | mss->check_shmem_swap = false; | |
c261e7d9 | 727 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
6a15a370 VB |
728 | /* |
729 | * For shared or readonly shmem mappings we know that all | |
730 | * swapped out pages belong to the shmem object, and we can | |
731 | * obtain the swap value much more efficiently. For private | |
732 | * writable mappings, we might have COW pages that are | |
733 | * not affected by the parent swapped out pages of the shmem | |
734 | * object, so we have to distinguish them during the page walk. | |
735 | * Unless we know that the shmem object (or the part mapped by | |
736 | * our VMA) has no swapped out pages at all. | |
737 | */ | |
738 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
739 | ||
740 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
741 | !(vma->vm_flags & VM_WRITE)) { | |
fa76da46 | 742 | mss->swap += shmem_swapped; |
6a15a370 | 743 | } else { |
493b0e9d | 744 | mss->check_shmem_swap = true; |
6a15a370 VB |
745 | smaps_walk.pte_hole = smaps_pte_hole; |
746 | } | |
c261e7d9 VB |
747 | } |
748 | #endif | |
d82ef020 | 749 | /* mmap_sem is held in m_start */ |
14eb6fdd | 750 | walk_page_vma(vma, &smaps_walk); |
8e68d689 VB |
751 | } |
752 | ||
753 | #define SEQ_PUT_DEC(str, val) \ | |
754 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) | |
f1547959 VB |
755 | |
756 | /* Show the contents common for smaps and smaps_rollup */ | |
757 | static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss) | |
758 | { | |
759 | SEQ_PUT_DEC("Rss: ", mss->resident); | |
760 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); | |
761 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); | |
762 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); | |
763 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); | |
764 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); | |
765 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); | |
766 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); | |
767 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); | |
768 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); | |
769 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); | |
770 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); | |
771 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", | |
772 | mss->private_hugetlb >> 10, 7); | |
773 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); | |
774 | SEQ_PUT_DEC(" kB\nSwapPss: ", | |
775 | mss->swap_pss >> PSS_SHIFT); | |
776 | SEQ_PUT_DEC(" kB\nLocked: ", | |
777 | mss->pss_locked >> PSS_SHIFT); | |
778 | seq_puts(m, " kB\n"); | |
779 | } | |
780 | ||
8e68d689 VB |
781 | static int show_smap(struct seq_file *m, void *v) |
782 | { | |
8e68d689 | 783 | struct vm_area_struct *vma = v; |
258f669e VB |
784 | struct mem_size_stats mss; |
785 | ||
786 | memset(&mss, 0, sizeof(mss)); | |
787 | ||
788 | smap_gather_stats(vma, &mss); | |
789 | ||
790 | show_map_vma(m, vma); | |
791 | ||
792 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); | |
793 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); | |
794 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); | |
795 | seq_puts(m, " kB\n"); | |
796 | ||
797 | __show_smap(m, &mss); | |
798 | ||
7635d9cb MH |
799 | seq_printf(m, "THPeligible: %d\n", transparent_hugepage_enabled(vma)); |
800 | ||
258f669e VB |
801 | if (arch_pkeys_enabled()) |
802 | seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); | |
803 | show_smap_vma_flags(m, vma); | |
804 | ||
805 | m_cache_vma(m, vma); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
810 | static int show_smaps_rollup(struct seq_file *m, void *v) | |
811 | { | |
812 | struct proc_maps_private *priv = m->private; | |
813 | struct mem_size_stats mss; | |
814 | struct mm_struct *mm; | |
815 | struct vm_area_struct *vma; | |
816 | unsigned long last_vma_end = 0; | |
8e68d689 | 817 | int ret = 0; |
8e68d689 | 818 | |
258f669e VB |
819 | priv->task = get_proc_task(priv->inode); |
820 | if (!priv->task) | |
821 | return -ESRCH; | |
493b0e9d | 822 | |
258f669e VB |
823 | mm = priv->mm; |
824 | if (!mm || !mmget_not_zero(mm)) { | |
825 | ret = -ESRCH; | |
826 | goto out_put_task; | |
493b0e9d | 827 | } |
4752c369 | 828 | |
258f669e | 829 | memset(&mss, 0, sizeof(mss)); |
493b0e9d | 830 | |
258f669e VB |
831 | down_read(&mm->mmap_sem); |
832 | hold_task_mempolicy(priv); | |
f1547959 | 833 | |
258f669e VB |
834 | for (vma = priv->mm->mmap; vma; vma = vma->vm_next) { |
835 | smap_gather_stats(vma, &mss); | |
836 | last_vma_end = vma->vm_end; | |
493b0e9d | 837 | } |
258f669e VB |
838 | |
839 | show_vma_header_prefix(m, priv->mm->mmap->vm_start, | |
840 | last_vma_end, 0, 0, 0, 0); | |
841 | seq_pad(m, ' '); | |
842 | seq_puts(m, "[rollup]\n"); | |
843 | ||
844 | __show_smap(m, &mss); | |
845 | ||
846 | release_task_mempolicy(priv); | |
847 | up_read(&mm->mmap_sem); | |
848 | mmput(mm); | |
849 | ||
850 | out_put_task: | |
851 | put_task_struct(priv->task); | |
852 | priv->task = NULL; | |
853 | ||
493b0e9d | 854 | return ret; |
e070ad49 | 855 | } |
d1be35cb | 856 | #undef SEQ_PUT_DEC |
e070ad49 | 857 | |
03a44825 | 858 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
859 | .start = m_start, |
860 | .next = m_next, | |
861 | .stop = m_stop, | |
871305bb | 862 | .show = show_smap |
a6198797 MM |
863 | }; |
864 | ||
b7643757 | 865 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
866 | { |
867 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
868 | } | |
869 | ||
258f669e | 870 | static int smaps_rollup_open(struct inode *inode, struct file *file) |
493b0e9d | 871 | { |
258f669e | 872 | int ret; |
493b0e9d | 873 | struct proc_maps_private *priv; |
258f669e VB |
874 | |
875 | priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); | |
876 | if (!priv) | |
493b0e9d | 877 | return -ENOMEM; |
258f669e VB |
878 | |
879 | ret = single_open(file, show_smaps_rollup, priv); | |
880 | if (ret) | |
881 | goto out_free; | |
882 | ||
883 | priv->inode = inode; | |
884 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); | |
885 | if (IS_ERR(priv->mm)) { | |
886 | ret = PTR_ERR(priv->mm); | |
887 | ||
888 | single_release(inode, file); | |
889 | goto out_free; | |
493b0e9d | 890 | } |
258f669e | 891 | |
493b0e9d | 892 | return 0; |
258f669e VB |
893 | |
894 | out_free: | |
895 | kfree(priv); | |
896 | return ret; | |
897 | } | |
898 | ||
899 | static int smaps_rollup_release(struct inode *inode, struct file *file) | |
900 | { | |
901 | struct seq_file *seq = file->private_data; | |
902 | struct proc_maps_private *priv = seq->private; | |
903 | ||
904 | if (priv->mm) | |
905 | mmdrop(priv->mm); | |
906 | ||
907 | kfree(priv); | |
908 | return single_release(inode, file); | |
493b0e9d DC |
909 | } |
910 | ||
b7643757 SP |
911 | const struct file_operations proc_pid_smaps_operations = { |
912 | .open = pid_smaps_open, | |
913 | .read = seq_read, | |
914 | .llseek = seq_lseek, | |
29a40ace | 915 | .release = proc_map_release, |
b7643757 SP |
916 | }; |
917 | ||
493b0e9d | 918 | const struct file_operations proc_pid_smaps_rollup_operations = { |
258f669e | 919 | .open = smaps_rollup_open, |
493b0e9d DC |
920 | .read = seq_read, |
921 | .llseek = seq_lseek, | |
258f669e | 922 | .release = smaps_rollup_release, |
493b0e9d DC |
923 | }; |
924 | ||
040fa020 PE |
925 | enum clear_refs_types { |
926 | CLEAR_REFS_ALL = 1, | |
927 | CLEAR_REFS_ANON, | |
928 | CLEAR_REFS_MAPPED, | |
0f8975ec | 929 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 930 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
931 | CLEAR_REFS_LAST, |
932 | }; | |
933 | ||
af9de7eb | 934 | struct clear_refs_private { |
0f8975ec | 935 | enum clear_refs_types type; |
af9de7eb PE |
936 | }; |
937 | ||
7d5b3bfa | 938 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
939 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
940 | unsigned long addr, pte_t *pte) | |
941 | { | |
0f8975ec PE |
942 | /* |
943 | * The soft-dirty tracker uses #PF-s to catch writes | |
944 | * to pages, so write-protect the pte as well. See the | |
1ad1335d | 945 | * Documentation/admin-guide/mm/soft-dirty.rst for full description |
0f8975ec PE |
946 | * of how soft-dirty works. |
947 | */ | |
948 | pte_t ptent = *pte; | |
179ef71c CG |
949 | |
950 | if (pte_present(ptent)) { | |
04a86453 AK |
951 | pte_t old_pte; |
952 | ||
953 | old_pte = ptep_modify_prot_start(vma, addr, pte); | |
954 | ptent = pte_wrprotect(old_pte); | |
a7b76174 | 955 | ptent = pte_clear_soft_dirty(ptent); |
04a86453 | 956 | ptep_modify_prot_commit(vma, addr, pte, old_pte, ptent); |
179ef71c CG |
957 | } else if (is_swap_pte(ptent)) { |
958 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 959 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 960 | } |
0f8975ec | 961 | } |
5d3875a0 LD |
962 | #else |
963 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
964 | unsigned long addr, pte_t *pte) | |
965 | { | |
966 | } | |
967 | #endif | |
0f8975ec | 968 | |
5d3875a0 | 969 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
970 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
971 | unsigned long addr, pmd_t *pmdp) | |
972 | { | |
a3cf988f | 973 | pmd_t old, pmd = *pmdp; |
5b7abeae | 974 | |
ab6e3d09 NH |
975 | if (pmd_present(pmd)) { |
976 | /* See comment in change_huge_pmd() */ | |
a3cf988f KS |
977 | old = pmdp_invalidate(vma, addr, pmdp); |
978 | if (pmd_dirty(old)) | |
ab6e3d09 | 979 | pmd = pmd_mkdirty(pmd); |
a3cf988f | 980 | if (pmd_young(old)) |
ab6e3d09 NH |
981 | pmd = pmd_mkyoung(pmd); |
982 | ||
983 | pmd = pmd_wrprotect(pmd); | |
984 | pmd = pmd_clear_soft_dirty(pmd); | |
985 | ||
986 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
987 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
988 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
989 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
990 | } | |
7d5b3bfa | 991 | } |
7d5b3bfa | 992 | #else |
7d5b3bfa KS |
993 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
994 | unsigned long addr, pmd_t *pmdp) | |
995 | { | |
996 | } | |
997 | #endif | |
998 | ||
a6198797 | 999 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1000 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1001 | { |
af9de7eb | 1002 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1003 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1004 | pte_t *pte, ptent; |
1005 | spinlock_t *ptl; | |
1006 | struct page *page; | |
1007 | ||
b6ec57f4 KS |
1008 | ptl = pmd_trans_huge_lock(pmd, vma); |
1009 | if (ptl) { | |
7d5b3bfa KS |
1010 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1011 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1012 | goto out; | |
1013 | } | |
1014 | ||
84c3fc4e ZY |
1015 | if (!pmd_present(*pmd)) |
1016 | goto out; | |
1017 | ||
7d5b3bfa KS |
1018 | page = pmd_page(*pmd); |
1019 | ||
1020 | /* Clear accessed and referenced bits. */ | |
1021 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1022 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1023 | ClearPageReferenced(page); |
1024 | out: | |
1025 | spin_unlock(ptl); | |
1026 | return 0; | |
1027 | } | |
1028 | ||
1a5a9906 AA |
1029 | if (pmd_trans_unstable(pmd)) |
1030 | return 0; | |
03319327 | 1031 | |
a6198797 MM |
1032 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1033 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1034 | ptent = *pte; | |
a6198797 | 1035 | |
0f8975ec PE |
1036 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1037 | clear_soft_dirty(vma, addr, pte); | |
1038 | continue; | |
1039 | } | |
1040 | ||
179ef71c CG |
1041 | if (!pte_present(ptent)) |
1042 | continue; | |
1043 | ||
a6198797 MM |
1044 | page = vm_normal_page(vma, addr, ptent); |
1045 | if (!page) | |
1046 | continue; | |
1047 | ||
1048 | /* Clear accessed and referenced bits. */ | |
1049 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1050 | test_and_clear_page_young(page); |
a6198797 MM |
1051 | ClearPageReferenced(page); |
1052 | } | |
1053 | pte_unmap_unlock(pte - 1, ptl); | |
1054 | cond_resched(); | |
1055 | return 0; | |
1056 | } | |
1057 | ||
5c64f52a NH |
1058 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1059 | struct mm_walk *walk) | |
1060 | { | |
1061 | struct clear_refs_private *cp = walk->private; | |
1062 | struct vm_area_struct *vma = walk->vma; | |
1063 | ||
48684a65 NH |
1064 | if (vma->vm_flags & VM_PFNMAP) |
1065 | return 1; | |
1066 | ||
5c64f52a NH |
1067 | /* |
1068 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1069 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1070 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1071 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1072 | */ | |
1073 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1074 | return 1; | |
1075 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1076 | return 1; | |
1077 | return 0; | |
1078 | } | |
1079 | ||
f248dcb3 MM |
1080 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1081 | size_t count, loff_t *ppos) | |
b813e931 | 1082 | { |
f248dcb3 | 1083 | struct task_struct *task; |
fb92a4b0 | 1084 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1085 | struct mm_struct *mm; |
b813e931 | 1086 | struct vm_area_struct *vma; |
040fa020 | 1087 | enum clear_refs_types type; |
b3a81d08 | 1088 | struct mmu_gather tlb; |
040fa020 | 1089 | int itype; |
0a8cb8e3 | 1090 | int rv; |
b813e931 | 1091 | |
f248dcb3 MM |
1092 | memset(buffer, 0, sizeof(buffer)); |
1093 | if (count > sizeof(buffer) - 1) | |
1094 | count = sizeof(buffer) - 1; | |
1095 | if (copy_from_user(buffer, buf, count)) | |
1096 | return -EFAULT; | |
040fa020 | 1097 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1098 | if (rv < 0) |
1099 | return rv; | |
040fa020 PE |
1100 | type = (enum clear_refs_types)itype; |
1101 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1102 | return -EINVAL; |
541c237c | 1103 | |
496ad9aa | 1104 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1105 | if (!task) |
1106 | return -ESRCH; | |
1107 | mm = get_task_mm(task); | |
1108 | if (mm) { | |
ac46d4f3 | 1109 | struct mmu_notifier_range range; |
af9de7eb | 1110 | struct clear_refs_private cp = { |
0f8975ec | 1111 | .type = type, |
af9de7eb | 1112 | }; |
20cbc972 AM |
1113 | struct mm_walk clear_refs_walk = { |
1114 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 1115 | .test_walk = clear_refs_test_walk, |
20cbc972 | 1116 | .mm = mm, |
af9de7eb | 1117 | .private = &cp, |
20cbc972 | 1118 | }; |
695f0559 PC |
1119 | |
1120 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
4e80153a MH |
1121 | if (down_write_killable(&mm->mmap_sem)) { |
1122 | count = -EINTR; | |
1123 | goto out_mm; | |
1124 | } | |
1125 | ||
695f0559 PC |
1126 | /* |
1127 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1128 | * resident set size to this mm's current rss value. | |
1129 | */ | |
695f0559 PC |
1130 | reset_mm_hiwater_rss(mm); |
1131 | up_write(&mm->mmap_sem); | |
1132 | goto out_mm; | |
1133 | } | |
1134 | ||
f248dcb3 | 1135 | down_read(&mm->mmap_sem); |
b3a81d08 | 1136 | tlb_gather_mmu(&tlb, mm, 0, -1); |
64e45507 PF |
1137 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1138 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1139 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1140 | continue; | |
1141 | up_read(&mm->mmap_sem); | |
4e80153a MH |
1142 | if (down_write_killable(&mm->mmap_sem)) { |
1143 | count = -EINTR; | |
1144 | goto out_mm; | |
1145 | } | |
64e45507 PF |
1146 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1147 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1148 | vma_set_page_prot(vma); | |
1149 | } | |
1150 | downgrade_write(&mm->mmap_sem); | |
1151 | break; | |
1152 | } | |
ac46d4f3 JG |
1153 | |
1154 | mmu_notifier_range_init(&range, mm, 0, -1UL); | |
1155 | mmu_notifier_invalidate_range_start(&range); | |
64e45507 | 1156 | } |
0f30206b | 1157 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
0f8975ec | 1158 | if (type == CLEAR_REFS_SOFT_DIRTY) |
ac46d4f3 | 1159 | mmu_notifier_invalidate_range_end(&range); |
b3a81d08 | 1160 | tlb_finish_mmu(&tlb, 0, -1); |
f248dcb3 | 1161 | up_read(&mm->mmap_sem); |
695f0559 | 1162 | out_mm: |
f248dcb3 MM |
1163 | mmput(mm); |
1164 | } | |
1165 | put_task_struct(task); | |
fb92a4b0 VL |
1166 | |
1167 | return count; | |
b813e931 DR |
1168 | } |
1169 | ||
f248dcb3 MM |
1170 | const struct file_operations proc_clear_refs_operations = { |
1171 | .write = clear_refs_write, | |
6038f373 | 1172 | .llseek = noop_llseek, |
f248dcb3 MM |
1173 | }; |
1174 | ||
092b50ba NH |
1175 | typedef struct { |
1176 | u64 pme; | |
1177 | } pagemap_entry_t; | |
1178 | ||
85863e47 | 1179 | struct pagemapread { |
8c829622 | 1180 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1181 | pagemap_entry_t *buffer; |
1c90308e | 1182 | bool show_pfn; |
85863e47 MM |
1183 | }; |
1184 | ||
5aaabe83 NH |
1185 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1186 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1187 | ||
deb94544 KK |
1188 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1189 | #define PM_PFRAME_BITS 55 | |
1190 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1191 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1192 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1193 | #define PM_FILE BIT_ULL(61) |
1194 | #define PM_SWAP BIT_ULL(62) | |
1195 | #define PM_PRESENT BIT_ULL(63) | |
1196 | ||
85863e47 MM |
1197 | #define PM_END_OF_BUFFER 1 |
1198 | ||
deb94544 | 1199 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1200 | { |
deb94544 | 1201 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1202 | } |
1203 | ||
1204 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1205 | struct pagemapread *pm) |
1206 | { | |
092b50ba | 1207 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1208 | if (pm->pos >= pm->len) |
aae8679b | 1209 | return PM_END_OF_BUFFER; |
85863e47 MM |
1210 | return 0; |
1211 | } | |
1212 | ||
1213 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1214 | struct mm_walk *walk) |
85863e47 | 1215 | { |
2165009b | 1216 | struct pagemapread *pm = walk->private; |
68b5a652 | 1217 | unsigned long addr = start; |
85863e47 | 1218 | int err = 0; |
092b50ba | 1219 | |
68b5a652 PF |
1220 | while (addr < end) { |
1221 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1222 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1223 | /* End of address space hole, which we mark as non-present. */ |
1224 | unsigned long hole_end; | |
68b5a652 | 1225 | |
87e6d49a PF |
1226 | if (vma) |
1227 | hole_end = min(end, vma->vm_start); | |
1228 | else | |
1229 | hole_end = end; | |
1230 | ||
1231 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1232 | err = add_to_pagemap(addr, &pme, pm); | |
1233 | if (err) | |
1234 | goto out; | |
68b5a652 PF |
1235 | } |
1236 | ||
87e6d49a PF |
1237 | if (!vma) |
1238 | break; | |
1239 | ||
1240 | /* Addresses in the VMA. */ | |
1241 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1242 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1243 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1244 | err = add_to_pagemap(addr, &pme, pm); |
1245 | if (err) | |
1246 | goto out; | |
1247 | } | |
85863e47 | 1248 | } |
68b5a652 | 1249 | out: |
85863e47 MM |
1250 | return err; |
1251 | } | |
1252 | ||
deb94544 | 1253 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1254 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1255 | { |
deb94544 | 1256 | u64 frame = 0, flags = 0; |
052fb0d6 | 1257 | struct page *page = NULL; |
85863e47 | 1258 | |
052fb0d6 | 1259 | if (pte_present(pte)) { |
1c90308e KK |
1260 | if (pm->show_pfn) |
1261 | frame = pte_pfn(pte); | |
deb94544 | 1262 | flags |= PM_PRESENT; |
df6ad698 | 1263 | page = _vm_normal_page(vma, addr, pte, true); |
e9cdd6e7 | 1264 | if (pte_soft_dirty(pte)) |
deb94544 | 1265 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1266 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1267 | swp_entry_t entry; |
1268 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1269 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1270 | entry = pte_to_swp_entry(pte); |
ab6ecf24 HY |
1271 | if (pm->show_pfn) |
1272 | frame = swp_type(entry) | | |
1273 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1274 | flags |= PM_SWAP; |
052fb0d6 KK |
1275 | if (is_migration_entry(entry)) |
1276 | page = migration_entry_to_page(entry); | |
5042db43 JG |
1277 | |
1278 | if (is_device_private_entry(entry)) | |
1279 | page = device_private_entry_to_page(entry); | |
052fb0d6 KK |
1280 | } |
1281 | ||
1282 | if (page && !PageAnon(page)) | |
1283 | flags |= PM_FILE; | |
77bb499b KK |
1284 | if (page && page_mapcount(page) == 1) |
1285 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1286 | if (vma->vm_flags & VM_SOFTDIRTY) |
1287 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1288 | |
deb94544 | 1289 | return make_pme(frame, flags); |
bcf8039e DH |
1290 | } |
1291 | ||
356515e7 | 1292 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1293 | struct mm_walk *walk) |
85863e47 | 1294 | { |
f995ece2 | 1295 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1296 | struct pagemapread *pm = walk->private; |
bf929152 | 1297 | spinlock_t *ptl; |
05fbf357 | 1298 | pte_t *pte, *orig_pte; |
85863e47 MM |
1299 | int err = 0; |
1300 | ||
356515e7 | 1301 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1302 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1303 | if (ptl) { | |
356515e7 KK |
1304 | u64 flags = 0, frame = 0; |
1305 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1306 | struct page *page = NULL; |
0f8975ec | 1307 | |
b83d7e43 | 1308 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1309 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1310 | |
356515e7 | 1311 | if (pmd_present(pmd)) { |
84c3fc4e | 1312 | page = pmd_page(pmd); |
77bb499b | 1313 | |
356515e7 | 1314 | flags |= PM_PRESENT; |
b83d7e43 HY |
1315 | if (pmd_soft_dirty(pmd)) |
1316 | flags |= PM_SOFT_DIRTY; | |
1c90308e KK |
1317 | if (pm->show_pfn) |
1318 | frame = pmd_pfn(pmd) + | |
1319 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1320 | } |
84c3fc4e ZY |
1321 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1322 | else if (is_swap_pmd(pmd)) { | |
1323 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
ab6ecf24 | 1324 | unsigned long offset; |
84c3fc4e | 1325 | |
ab6ecf24 HY |
1326 | if (pm->show_pfn) { |
1327 | offset = swp_offset(entry) + | |
1328 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
1329 | frame = swp_type(entry) | | |
1330 | (offset << MAX_SWAPFILES_SHIFT); | |
1331 | } | |
84c3fc4e | 1332 | flags |= PM_SWAP; |
b83d7e43 HY |
1333 | if (pmd_swp_soft_dirty(pmd)) |
1334 | flags |= PM_SOFT_DIRTY; | |
84c3fc4e ZY |
1335 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
1336 | page = migration_entry_to_page(entry); | |
1337 | } | |
1338 | #endif | |
1339 | ||
1340 | if (page && page_mapcount(page) == 1) | |
1341 | flags |= PM_MMAP_EXCLUSIVE; | |
356515e7 | 1342 | |
025c5b24 | 1343 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1344 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1345 | |
092b50ba | 1346 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1347 | if (err) |
1348 | break; | |
ab6ecf24 HY |
1349 | if (pm->show_pfn) { |
1350 | if (flags & PM_PRESENT) | |
1351 | frame++; | |
1352 | else if (flags & PM_SWAP) | |
1353 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
1354 | } | |
5aaabe83 | 1355 | } |
bf929152 | 1356 | spin_unlock(ptl); |
025c5b24 | 1357 | return err; |
5aaabe83 NH |
1358 | } |
1359 | ||
356515e7 | 1360 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1361 | return 0; |
356515e7 | 1362 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1363 | |
f995ece2 NH |
1364 | /* |
1365 | * We can assume that @vma always points to a valid one and @end never | |
1366 | * goes beyond vma->vm_end. | |
1367 | */ | |
356515e7 | 1368 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1369 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1370 | pagemap_entry_t pme; | |
05fbf357 | 1371 | |
deb94544 | 1372 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1373 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1374 | if (err) |
81d0fa62 | 1375 | break; |
85863e47 | 1376 | } |
f995ece2 | 1377 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1378 | |
1379 | cond_resched(); | |
1380 | ||
1381 | return err; | |
1382 | } | |
1383 | ||
1a5cb814 | 1384 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1385 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1386 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1387 | unsigned long addr, unsigned long end, |
1388 | struct mm_walk *walk) | |
5dc37642 | 1389 | { |
5dc37642 | 1390 | struct pagemapread *pm = walk->private; |
f995ece2 | 1391 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1392 | u64 flags = 0, frame = 0; |
5dc37642 | 1393 | int err = 0; |
356515e7 | 1394 | pte_t pte; |
5dc37642 | 1395 | |
f995ece2 | 1396 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1397 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1398 | |
356515e7 KK |
1399 | pte = huge_ptep_get(ptep); |
1400 | if (pte_present(pte)) { | |
1401 | struct page *page = pte_page(pte); | |
1402 | ||
1403 | if (!PageAnon(page)) | |
1404 | flags |= PM_FILE; | |
1405 | ||
77bb499b KK |
1406 | if (page_mapcount(page) == 1) |
1407 | flags |= PM_MMAP_EXCLUSIVE; | |
1408 | ||
356515e7 | 1409 | flags |= PM_PRESENT; |
1c90308e KK |
1410 | if (pm->show_pfn) |
1411 | frame = pte_pfn(pte) + | |
1412 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1413 | } |
1414 | ||
5dc37642 | 1415 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1416 | pagemap_entry_t pme = make_pme(frame, flags); |
1417 | ||
092b50ba | 1418 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1419 | if (err) |
1420 | return err; | |
1c90308e | 1421 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1422 | frame++; |
5dc37642 NH |
1423 | } |
1424 | ||
1425 | cond_resched(); | |
1426 | ||
1427 | return err; | |
1428 | } | |
1a5cb814 | 1429 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1430 | |
85863e47 MM |
1431 | /* |
1432 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1433 | * | |
f16278c6 HR |
1434 | * For each page in the address space, this file contains one 64-bit entry |
1435 | * consisting of the following: | |
1436 | * | |
052fb0d6 | 1437 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1438 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1439 | * Bits 5-54 swap offset if swapped |
1ad1335d | 1440 | * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) |
77bb499b KK |
1441 | * Bit 56 page exclusively mapped |
1442 | * Bits 57-60 zero | |
052fb0d6 | 1443 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1444 | * Bit 62 page swapped |
1445 | * Bit 63 page present | |
1446 | * | |
1447 | * If the page is not present but in swap, then the PFN contains an | |
1448 | * encoding of the swap file number and the page's offset into the | |
1449 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1450 | * precisely which pages are mapped (or in swap) and comparing mapped |
1451 | * pages between processes. | |
1452 | * | |
1453 | * Efficient users of this interface will use /proc/pid/maps to | |
1454 | * determine which areas of memory are actually mapped and llseek to | |
1455 | * skip over unmapped regions. | |
1456 | */ | |
1457 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1458 | size_t count, loff_t *ppos) | |
1459 | { | |
a06db751 | 1460 | struct mm_struct *mm = file->private_data; |
85863e47 | 1461 | struct pagemapread pm; |
ee1e6ab6 | 1462 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1463 | unsigned long src; |
1464 | unsigned long svpfn; | |
1465 | unsigned long start_vaddr; | |
1466 | unsigned long end_vaddr; | |
a06db751 | 1467 | int ret = 0, copied = 0; |
85863e47 | 1468 | |
388f7934 | 1469 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1470 | goto out; |
1471 | ||
85863e47 MM |
1472 | ret = -EINVAL; |
1473 | /* file position must be aligned */ | |
aae8679b | 1474 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1475 | goto out_mm; |
85863e47 MM |
1476 | |
1477 | ret = 0; | |
08161786 | 1478 | if (!count) |
a06db751 | 1479 | goto out_mm; |
08161786 | 1480 | |
1c90308e KK |
1481 | /* do not disclose physical addresses: attack vector */ |
1482 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1483 | ||
8c829622 | 1484 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
6da2ec56 | 1485 | pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1486 | ret = -ENOMEM; |
d82ef020 | 1487 | if (!pm.buffer) |
a06db751 | 1488 | goto out_mm; |
85863e47 | 1489 | |
356515e7 | 1490 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1491 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1492 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1493 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1494 | #endif |
5d7e0d2b AM |
1495 | pagemap_walk.mm = mm; |
1496 | pagemap_walk.private = ± | |
1497 | ||
1498 | src = *ppos; | |
1499 | svpfn = src / PM_ENTRY_BYTES; | |
1500 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1501 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1502 | |
1503 | /* watch out for wraparound */ | |
a06db751 | 1504 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1505 | start_vaddr = end_vaddr; |
1506 | ||
1507 | /* | |
1508 | * The odds are that this will stop walking way | |
1509 | * before end_vaddr, because the length of the | |
1510 | * user buffer is tracked in "pm", and the walk | |
1511 | * will stop when we hit the end of the buffer. | |
1512 | */ | |
d82ef020 KH |
1513 | ret = 0; |
1514 | while (count && (start_vaddr < end_vaddr)) { | |
1515 | int len; | |
1516 | unsigned long end; | |
1517 | ||
1518 | pm.pos = 0; | |
ea251c1d | 1519 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1520 | /* overflow ? */ |
1521 | if (end < start_vaddr || end > end_vaddr) | |
1522 | end = end_vaddr; | |
1523 | down_read(&mm->mmap_sem); | |
1524 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1525 | up_read(&mm->mmap_sem); | |
1526 | start_vaddr = end; | |
1527 | ||
1528 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1529 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1530 | ret = -EFAULT; |
a06db751 | 1531 | goto out_free; |
d82ef020 KH |
1532 | } |
1533 | copied += len; | |
1534 | buf += len; | |
1535 | count -= len; | |
85863e47 | 1536 | } |
d82ef020 KH |
1537 | *ppos += copied; |
1538 | if (!ret || ret == PM_END_OF_BUFFER) | |
1539 | ret = copied; | |
1540 | ||
98bc93e5 KM |
1541 | out_free: |
1542 | kfree(pm.buffer); | |
a06db751 KK |
1543 | out_mm: |
1544 | mmput(mm); | |
85863e47 MM |
1545 | out: |
1546 | return ret; | |
1547 | } | |
1548 | ||
541c237c PE |
1549 | static int pagemap_open(struct inode *inode, struct file *file) |
1550 | { | |
a06db751 KK |
1551 | struct mm_struct *mm; |
1552 | ||
a06db751 KK |
1553 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1554 | if (IS_ERR(mm)) | |
1555 | return PTR_ERR(mm); | |
1556 | file->private_data = mm; | |
1557 | return 0; | |
1558 | } | |
1559 | ||
1560 | static int pagemap_release(struct inode *inode, struct file *file) | |
1561 | { | |
1562 | struct mm_struct *mm = file->private_data; | |
1563 | ||
1564 | if (mm) | |
1565 | mmdrop(mm); | |
541c237c PE |
1566 | return 0; |
1567 | } | |
1568 | ||
85863e47 MM |
1569 | const struct file_operations proc_pagemap_operations = { |
1570 | .llseek = mem_lseek, /* borrow this */ | |
1571 | .read = pagemap_read, | |
541c237c | 1572 | .open = pagemap_open, |
a06db751 | 1573 | .release = pagemap_release, |
85863e47 | 1574 | }; |
1e883281 | 1575 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1576 | |
6e21c8f1 | 1577 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1578 | |
f69ff943 | 1579 | struct numa_maps { |
f69ff943 SW |
1580 | unsigned long pages; |
1581 | unsigned long anon; | |
1582 | unsigned long active; | |
1583 | unsigned long writeback; | |
1584 | unsigned long mapcount_max; | |
1585 | unsigned long dirty; | |
1586 | unsigned long swapcache; | |
1587 | unsigned long node[MAX_NUMNODES]; | |
1588 | }; | |
1589 | ||
5b52fc89 SW |
1590 | struct numa_maps_private { |
1591 | struct proc_maps_private proc_maps; | |
1592 | struct numa_maps md; | |
1593 | }; | |
1594 | ||
eb4866d0 DH |
1595 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1596 | unsigned long nr_pages) | |
f69ff943 SW |
1597 | { |
1598 | int count = page_mapcount(page); | |
1599 | ||
eb4866d0 | 1600 | md->pages += nr_pages; |
f69ff943 | 1601 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1602 | md->dirty += nr_pages; |
f69ff943 SW |
1603 | |
1604 | if (PageSwapCache(page)) | |
eb4866d0 | 1605 | md->swapcache += nr_pages; |
f69ff943 SW |
1606 | |
1607 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1608 | md->active += nr_pages; |
f69ff943 SW |
1609 | |
1610 | if (PageWriteback(page)) | |
eb4866d0 | 1611 | md->writeback += nr_pages; |
f69ff943 SW |
1612 | |
1613 | if (PageAnon(page)) | |
eb4866d0 | 1614 | md->anon += nr_pages; |
f69ff943 SW |
1615 | |
1616 | if (count > md->mapcount_max) | |
1617 | md->mapcount_max = count; | |
1618 | ||
eb4866d0 | 1619 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1620 | } |
1621 | ||
3200a8aa DH |
1622 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1623 | unsigned long addr) | |
1624 | { | |
1625 | struct page *page; | |
1626 | int nid; | |
1627 | ||
1628 | if (!pte_present(pte)) | |
1629 | return NULL; | |
1630 | ||
1631 | page = vm_normal_page(vma, addr, pte); | |
1632 | if (!page) | |
1633 | return NULL; | |
1634 | ||
1635 | if (PageReserved(page)) | |
1636 | return NULL; | |
1637 | ||
1638 | nid = page_to_nid(page); | |
4ff1b2c2 | 1639 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1640 | return NULL; |
1641 | ||
1642 | return page; | |
1643 | } | |
1644 | ||
28093f9f GS |
1645 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1646 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1647 | struct vm_area_struct *vma, | |
1648 | unsigned long addr) | |
1649 | { | |
1650 | struct page *page; | |
1651 | int nid; | |
1652 | ||
1653 | if (!pmd_present(pmd)) | |
1654 | return NULL; | |
1655 | ||
1656 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1657 | if (!page) | |
1658 | return NULL; | |
1659 | ||
1660 | if (PageReserved(page)) | |
1661 | return NULL; | |
1662 | ||
1663 | nid = page_to_nid(page); | |
1664 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1665 | return NULL; | |
1666 | ||
1667 | return page; | |
1668 | } | |
1669 | #endif | |
1670 | ||
f69ff943 SW |
1671 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1672 | unsigned long end, struct mm_walk *walk) | |
1673 | { | |
d85f4d6d NH |
1674 | struct numa_maps *md = walk->private; |
1675 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1676 | spinlock_t *ptl; |
1677 | pte_t *orig_pte; | |
1678 | pte_t *pte; | |
1679 | ||
28093f9f | 1680 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1681 | ptl = pmd_trans_huge_lock(pmd, vma); |
1682 | if (ptl) { | |
025c5b24 NH |
1683 | struct page *page; |
1684 | ||
28093f9f | 1685 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1686 | if (page) |
28093f9f | 1687 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1688 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1689 | spin_unlock(ptl); |
025c5b24 | 1690 | return 0; |
32ef4384 DH |
1691 | } |
1692 | ||
1a5a9906 AA |
1693 | if (pmd_trans_unstable(pmd)) |
1694 | return 0; | |
28093f9f | 1695 | #endif |
f69ff943 SW |
1696 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1697 | do { | |
d85f4d6d | 1698 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1699 | if (!page) |
1700 | continue; | |
eb4866d0 | 1701 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1702 | |
1703 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1704 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1705 | cond_resched(); |
f69ff943 SW |
1706 | return 0; |
1707 | } | |
1708 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1709 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1710 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1711 | { | |
5c2ff95e | 1712 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1713 | struct numa_maps *md; |
1714 | struct page *page; | |
1715 | ||
5c2ff95e | 1716 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1717 | return 0; |
1718 | ||
5c2ff95e | 1719 | page = pte_page(huge_pte); |
f69ff943 SW |
1720 | if (!page) |
1721 | return 0; | |
1722 | ||
1723 | md = walk->private; | |
5c2ff95e | 1724 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1725 | return 0; |
1726 | } | |
1727 | ||
1728 | #else | |
632fd60f | 1729 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1730 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1731 | { | |
1732 | return 0; | |
1733 | } | |
1734 | #endif | |
1735 | ||
1736 | /* | |
1737 | * Display pages allocated per node and memory policy via /proc. | |
1738 | */ | |
871305bb | 1739 | static int show_numa_map(struct seq_file *m, void *v) |
f69ff943 | 1740 | { |
5b52fc89 SW |
1741 | struct numa_maps_private *numa_priv = m->private; |
1742 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1743 | struct vm_area_struct *vma = v; |
5b52fc89 | 1744 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1745 | struct file *file = vma->vm_file; |
1746 | struct mm_struct *mm = vma->vm_mm; | |
d85f4d6d NH |
1747 | struct mm_walk walk = { |
1748 | .hugetlb_entry = gather_hugetlb_stats, | |
1749 | .pmd_entry = gather_pte_stats, | |
1750 | .private = md, | |
1751 | .mm = mm, | |
1752 | }; | |
f69ff943 | 1753 | struct mempolicy *pol; |
948927ee DR |
1754 | char buffer[64]; |
1755 | int nid; | |
f69ff943 SW |
1756 | |
1757 | if (!mm) | |
1758 | return 0; | |
1759 | ||
5b52fc89 SW |
1760 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1761 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1762 | |
498f2371 ON |
1763 | pol = __get_vma_policy(vma, vma->vm_start); |
1764 | if (pol) { | |
1765 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1766 | mpol_cond_put(pol); | |
1767 | } else { | |
1768 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1769 | } | |
f69ff943 SW |
1770 | |
1771 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1772 | ||
1773 | if (file) { | |
17c2b4ee | 1774 | seq_puts(m, " file="); |
2726d566 | 1775 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1776 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1777 | seq_puts(m, " heap"); |
1240ea0d | 1778 | } else if (is_stack(vma)) { |
65376df5 | 1779 | seq_puts(m, " stack"); |
f69ff943 SW |
1780 | } |
1781 | ||
fc360bd9 | 1782 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1783 | seq_puts(m, " huge"); |
fc360bd9 | 1784 | |
d85f4d6d NH |
1785 | /* mmap_sem is held by m_start */ |
1786 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1787 | |
1788 | if (!md->pages) | |
1789 | goto out; | |
1790 | ||
1791 | if (md->anon) | |
1792 | seq_printf(m, " anon=%lu", md->anon); | |
1793 | ||
1794 | if (md->dirty) | |
1795 | seq_printf(m, " dirty=%lu", md->dirty); | |
1796 | ||
1797 | if (md->pages != md->anon && md->pages != md->dirty) | |
1798 | seq_printf(m, " mapped=%lu", md->pages); | |
1799 | ||
1800 | if (md->mapcount_max > 1) | |
1801 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1802 | ||
1803 | if (md->swapcache) | |
1804 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1805 | ||
1806 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1807 | seq_printf(m, " active=%lu", md->active); | |
1808 | ||
1809 | if (md->writeback) | |
1810 | seq_printf(m, " writeback=%lu", md->writeback); | |
1811 | ||
948927ee DR |
1812 | for_each_node_state(nid, N_MEMORY) |
1813 | if (md->node[nid]) | |
1814 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1815 | |
1816 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1817 | out: |
1818 | seq_putc(m, '\n'); | |
b8c20a9b | 1819 | m_cache_vma(m, vma); |
f69ff943 SW |
1820 | return 0; |
1821 | } | |
5b52fc89 | 1822 | |
03a44825 | 1823 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1824 | .start = m_start, |
1825 | .next = m_next, | |
1826 | .stop = m_stop, | |
871305bb | 1827 | .show = show_numa_map, |
6e21c8f1 | 1828 | }; |
662795de | 1829 | |
b7643757 SP |
1830 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1831 | { | |
871305bb VB |
1832 | return proc_maps_open(inode, file, &proc_pid_numa_maps_op, |
1833 | sizeof(struct numa_maps_private)); | |
b7643757 SP |
1834 | } |
1835 | ||
1836 | const struct file_operations proc_pid_numa_maps_operations = { | |
1837 | .open = pid_numa_maps_open, | |
1838 | .read = seq_read, | |
1839 | .llseek = seq_lseek, | |
29a40ace | 1840 | .release = proc_map_release, |
b7643757 SP |
1841 | }; |
1842 | ||
f69ff943 | 1843 | #endif /* CONFIG_NUMA */ |