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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); | |
62 | SEQ_PUT_DEC(" kB\nVmPin:\t", mm->pinned_vm); | |
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, |
afd9883f | 426 | bool compound, bool young, bool dirty) |
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; | |
afd9883f KS |
453 | return; |
454 | } | |
455 | ||
456 | for (i = 0; i < nr; i++, page++) { | |
457 | int mapcount = page_mapcount(page); | |
458 | ||
459 | if (mapcount >= 2) { | |
460 | if (dirty || PageDirty(page)) | |
461 | mss->shared_dirty += PAGE_SIZE; | |
462 | else | |
463 | mss->shared_clean += PAGE_SIZE; | |
464 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; | |
465 | } else { | |
466 | if (dirty || PageDirty(page)) | |
467 | mss->private_dirty += PAGE_SIZE; | |
468 | else | |
469 | mss->private_clean += PAGE_SIZE; | |
470 | mss->pss += PAGE_SIZE << PSS_SHIFT; | |
471 | } | |
c164e038 KS |
472 | } |
473 | } | |
ae11c4d9 | 474 | |
c261e7d9 | 475 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
476 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
477 | struct mm_walk *walk) | |
478 | { | |
479 | struct mem_size_stats *mss = walk->private; | |
480 | ||
48131e03 VB |
481 | mss->swap += shmem_partial_swap_usage( |
482 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
483 | |
484 | return 0; | |
485 | } | |
c261e7d9 VB |
486 | #endif |
487 | ||
c164e038 KS |
488 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
489 | struct mm_walk *walk) | |
ae11c4d9 DH |
490 | { |
491 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 492 | struct vm_area_struct *vma = walk->vma; |
b1d4d9e0 | 493 | struct page *page = NULL; |
ae11c4d9 | 494 | |
c164e038 KS |
495 | if (pte_present(*pte)) { |
496 | page = vm_normal_page(vma, addr, *pte); | |
497 | } else if (is_swap_pte(*pte)) { | |
498 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 499 | |
8334b962 MK |
500 | if (!non_swap_entry(swpent)) { |
501 | int mapcount; | |
502 | ||
c164e038 | 503 | mss->swap += PAGE_SIZE; |
8334b962 MK |
504 | mapcount = swp_swapcount(swpent); |
505 | if (mapcount >= 2) { | |
506 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
507 | ||
508 | do_div(pss_delta, mapcount); | |
509 | mss->swap_pss += pss_delta; | |
510 | } else { | |
511 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
512 | } | |
513 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 514 | page = migration_entry_to_page(swpent); |
5042db43 JG |
515 | else if (is_device_private_entry(swpent)) |
516 | page = device_private_entry_to_page(swpent); | |
c261e7d9 VB |
517 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
518 | && pte_none(*pte))) { | |
48131e03 VB |
519 | page = find_get_entry(vma->vm_file->f_mapping, |
520 | linear_page_index(vma, addr)); | |
521 | if (!page) | |
522 | return; | |
523 | ||
524 | if (radix_tree_exceptional_entry(page)) | |
525 | mss->swap += PAGE_SIZE; | |
526 | else | |
09cbfeaf | 527 | put_page(page); |
48131e03 VB |
528 | |
529 | return; | |
b1d4d9e0 | 530 | } |
ae11c4d9 | 531 | |
ae11c4d9 DH |
532 | if (!page) |
533 | return; | |
afd9883f KS |
534 | |
535 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); | |
ae11c4d9 DH |
536 | } |
537 | ||
c164e038 KS |
538 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
539 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
540 | struct mm_walk *walk) | |
541 | { | |
542 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 543 | struct vm_area_struct *vma = walk->vma; |
c164e038 KS |
544 | struct page *page; |
545 | ||
546 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
547 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
548 | if (IS_ERR_OR_NULL(page)) | |
549 | return; | |
65c45377 KS |
550 | if (PageAnon(page)) |
551 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
552 | else if (PageSwapBacked(page)) | |
553 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
554 | else if (is_zone_device_page(page)) |
555 | /* pass */; | |
65c45377 KS |
556 | else |
557 | VM_BUG_ON_PAGE(1, page); | |
afd9883f | 558 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
c164e038 KS |
559 | } |
560 | #else | |
561 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
562 | struct mm_walk *walk) | |
563 | { | |
564 | } | |
565 | #endif | |
566 | ||
b3ae5acb | 567 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 568 | struct mm_walk *walk) |
e070ad49 | 569 | { |
14eb6fdd | 570 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 571 | pte_t *pte; |
705e87c0 | 572 | spinlock_t *ptl; |
e070ad49 | 573 | |
b6ec57f4 KS |
574 | ptl = pmd_trans_huge_lock(pmd, vma); |
575 | if (ptl) { | |
84c3fc4e ZY |
576 | if (pmd_present(*pmd)) |
577 | smaps_pmd_entry(pmd, addr, walk); | |
bf929152 | 578 | spin_unlock(ptl); |
14038302 | 579 | goto out; |
22e057c5 | 580 | } |
1a5a9906 AA |
581 | |
582 | if (pmd_trans_unstable(pmd)) | |
14038302 | 583 | goto out; |
22e057c5 DH |
584 | /* |
585 | * The mmap_sem held all the way back in m_start() is what | |
586 | * keeps khugepaged out of here and from collapsing things | |
587 | * in here. | |
588 | */ | |
705e87c0 | 589 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 590 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 591 | smaps_pte_entry(pte, addr, walk); |
705e87c0 | 592 | pte_unmap_unlock(pte - 1, ptl); |
14038302 | 593 | out: |
705e87c0 | 594 | cond_resched(); |
b3ae5acb | 595 | return 0; |
e070ad49 ML |
596 | } |
597 | ||
834f82e2 CG |
598 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
599 | { | |
600 | /* | |
601 | * Don't forget to update Documentation/ on changes. | |
602 | */ | |
603 | static const char mnemonics[BITS_PER_LONG][2] = { | |
604 | /* | |
605 | * In case if we meet a flag we don't know about. | |
606 | */ | |
607 | [0 ... (BITS_PER_LONG-1)] = "??", | |
608 | ||
609 | [ilog2(VM_READ)] = "rd", | |
610 | [ilog2(VM_WRITE)] = "wr", | |
611 | [ilog2(VM_EXEC)] = "ex", | |
612 | [ilog2(VM_SHARED)] = "sh", | |
613 | [ilog2(VM_MAYREAD)] = "mr", | |
614 | [ilog2(VM_MAYWRITE)] = "mw", | |
615 | [ilog2(VM_MAYEXEC)] = "me", | |
616 | [ilog2(VM_MAYSHARE)] = "ms", | |
617 | [ilog2(VM_GROWSDOWN)] = "gd", | |
618 | [ilog2(VM_PFNMAP)] = "pf", | |
619 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
620 | #ifdef CONFIG_X86_INTEL_MPX |
621 | [ilog2(VM_MPX)] = "mp", | |
622 | #endif | |
834f82e2 CG |
623 | [ilog2(VM_LOCKED)] = "lo", |
624 | [ilog2(VM_IO)] = "io", | |
625 | [ilog2(VM_SEQ_READ)] = "sr", | |
626 | [ilog2(VM_RAND_READ)] = "rr", | |
627 | [ilog2(VM_DONTCOPY)] = "dc", | |
628 | [ilog2(VM_DONTEXPAND)] = "de", | |
629 | [ilog2(VM_ACCOUNT)] = "ac", | |
630 | [ilog2(VM_NORESERVE)] = "nr", | |
631 | [ilog2(VM_HUGETLB)] = "ht", | |
b6fb293f | 632 | [ilog2(VM_SYNC)] = "sf", |
834f82e2 | 633 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 634 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 635 | [ilog2(VM_DONTDUMP)] = "dd", |
ec8e41ae NH |
636 | #ifdef CONFIG_MEM_SOFT_DIRTY |
637 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
638 | #endif | |
834f82e2 CG |
639 | [ilog2(VM_MIXEDMAP)] = "mm", |
640 | [ilog2(VM_HUGEPAGE)] = "hg", | |
641 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
642 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
643 | [ilog2(VM_UFFD_MISSING)]= "um", |
644 | [ilog2(VM_UFFD_WP)] = "uw", | |
5212213a | 645 | #ifdef CONFIG_ARCH_HAS_PKEYS |
c1192f84 DH |
646 | /* These come out via ProtectionKey: */ |
647 | [ilog2(VM_PKEY_BIT0)] = "", | |
648 | [ilog2(VM_PKEY_BIT1)] = "", | |
649 | [ilog2(VM_PKEY_BIT2)] = "", | |
650 | [ilog2(VM_PKEY_BIT3)] = "", | |
2c9e0a6f RP |
651 | #if VM_PKEY_BIT4 |
652 | [ilog2(VM_PKEY_BIT4)] = "", | |
c1192f84 | 653 | #endif |
5212213a | 654 | #endif /* CONFIG_ARCH_HAS_PKEYS */ |
834f82e2 CG |
655 | }; |
656 | size_t i; | |
657 | ||
658 | seq_puts(m, "VmFlags: "); | |
659 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
660 | if (!mnemonics[i][0]) |
661 | continue; | |
834f82e2 | 662 | if (vma->vm_flags & (1UL << i)) { |
f6640663 AV |
663 | seq_putc(m, mnemonics[i][0]); |
664 | seq_putc(m, mnemonics[i][1]); | |
665 | seq_putc(m, ' '); | |
834f82e2 CG |
666 | } |
667 | } | |
668 | seq_putc(m, '\n'); | |
669 | } | |
670 | ||
25ee01a2 NH |
671 | #ifdef CONFIG_HUGETLB_PAGE |
672 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
673 | unsigned long addr, unsigned long end, | |
674 | struct mm_walk *walk) | |
675 | { | |
676 | struct mem_size_stats *mss = walk->private; | |
677 | struct vm_area_struct *vma = walk->vma; | |
678 | struct page *page = NULL; | |
679 | ||
680 | if (pte_present(*pte)) { | |
681 | page = vm_normal_page(vma, addr, *pte); | |
682 | } else if (is_swap_pte(*pte)) { | |
683 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
684 | ||
685 | if (is_migration_entry(swpent)) | |
686 | page = migration_entry_to_page(swpent); | |
5042db43 JG |
687 | else if (is_device_private_entry(swpent)) |
688 | page = device_private_entry_to_page(swpent); | |
25ee01a2 NH |
689 | } |
690 | if (page) { | |
691 | int mapcount = page_mapcount(page); | |
692 | ||
693 | if (mapcount >= 2) | |
694 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
695 | else | |
696 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
697 | } | |
698 | return 0; | |
699 | } | |
700 | #endif /* HUGETLB_PAGE */ | |
701 | ||
8e68d689 VB |
702 | static void smap_gather_stats(struct vm_area_struct *vma, |
703 | struct mem_size_stats *mss) | |
e070ad49 | 704 | { |
2165009b DH |
705 | struct mm_walk smaps_walk = { |
706 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
707 | #ifdef CONFIG_HUGETLB_PAGE |
708 | .hugetlb_entry = smaps_hugetlb_range, | |
709 | #endif | |
2165009b | 710 | .mm = vma->vm_mm, |
2165009b | 711 | }; |
e070ad49 | 712 | |
493b0e9d | 713 | smaps_walk.private = mss; |
c261e7d9 VB |
714 | |
715 | #ifdef CONFIG_SHMEM | |
fa76da46 VB |
716 | /* In case of smaps_rollup, reset the value from previous vma */ |
717 | mss->check_shmem_swap = false; | |
c261e7d9 | 718 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
6a15a370 VB |
719 | /* |
720 | * For shared or readonly shmem mappings we know that all | |
721 | * swapped out pages belong to the shmem object, and we can | |
722 | * obtain the swap value much more efficiently. For private | |
723 | * writable mappings, we might have COW pages that are | |
724 | * not affected by the parent swapped out pages of the shmem | |
725 | * object, so we have to distinguish them during the page walk. | |
726 | * Unless we know that the shmem object (or the part mapped by | |
727 | * our VMA) has no swapped out pages at all. | |
728 | */ | |
729 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
730 | ||
731 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
732 | !(vma->vm_flags & VM_WRITE)) { | |
fa76da46 | 733 | mss->swap += shmem_swapped; |
6a15a370 | 734 | } else { |
493b0e9d | 735 | mss->check_shmem_swap = true; |
6a15a370 VB |
736 | smaps_walk.pte_hole = smaps_pte_hole; |
737 | } | |
c261e7d9 VB |
738 | } |
739 | #endif | |
740 | ||
d82ef020 | 741 | /* mmap_sem is held in m_start */ |
14eb6fdd | 742 | walk_page_vma(vma, &smaps_walk); |
493b0e9d DC |
743 | if (vma->vm_flags & VM_LOCKED) |
744 | mss->pss_locked += mss->pss; | |
8e68d689 VB |
745 | } |
746 | ||
747 | #define SEQ_PUT_DEC(str, val) \ | |
748 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) | |
f1547959 VB |
749 | |
750 | /* Show the contents common for smaps and smaps_rollup */ | |
751 | static void __show_smap(struct seq_file *m, const struct mem_size_stats *mss) | |
752 | { | |
753 | SEQ_PUT_DEC("Rss: ", mss->resident); | |
754 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); | |
755 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); | |
756 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); | |
757 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); | |
758 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); | |
759 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); | |
760 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); | |
761 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); | |
762 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); | |
763 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); | |
764 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); | |
765 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", | |
766 | mss->private_hugetlb >> 10, 7); | |
767 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); | |
768 | SEQ_PUT_DEC(" kB\nSwapPss: ", | |
769 | mss->swap_pss >> PSS_SHIFT); | |
770 | SEQ_PUT_DEC(" kB\nLocked: ", | |
771 | mss->pss_locked >> PSS_SHIFT); | |
772 | seq_puts(m, " kB\n"); | |
773 | } | |
774 | ||
8e68d689 VB |
775 | static int show_smap(struct seq_file *m, void *v) |
776 | { | |
8e68d689 | 777 | struct vm_area_struct *vma = v; |
258f669e VB |
778 | struct mem_size_stats mss; |
779 | ||
780 | memset(&mss, 0, sizeof(mss)); | |
781 | ||
782 | smap_gather_stats(vma, &mss); | |
783 | ||
784 | show_map_vma(m, vma); | |
785 | ||
786 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); | |
787 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); | |
788 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); | |
789 | seq_puts(m, " kB\n"); | |
790 | ||
791 | __show_smap(m, &mss); | |
792 | ||
793 | if (arch_pkeys_enabled()) | |
794 | seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); | |
795 | show_smap_vma_flags(m, vma); | |
796 | ||
797 | m_cache_vma(m, vma); | |
798 | ||
799 | return 0; | |
800 | } | |
801 | ||
802 | static int show_smaps_rollup(struct seq_file *m, void *v) | |
803 | { | |
804 | struct proc_maps_private *priv = m->private; | |
805 | struct mem_size_stats mss; | |
806 | struct mm_struct *mm; | |
807 | struct vm_area_struct *vma; | |
808 | unsigned long last_vma_end = 0; | |
8e68d689 | 809 | int ret = 0; |
8e68d689 | 810 | |
258f669e VB |
811 | priv->task = get_proc_task(priv->inode); |
812 | if (!priv->task) | |
813 | return -ESRCH; | |
493b0e9d | 814 | |
258f669e VB |
815 | mm = priv->mm; |
816 | if (!mm || !mmget_not_zero(mm)) { | |
817 | ret = -ESRCH; | |
818 | goto out_put_task; | |
493b0e9d | 819 | } |
4752c369 | 820 | |
258f669e | 821 | memset(&mss, 0, sizeof(mss)); |
493b0e9d | 822 | |
258f669e VB |
823 | down_read(&mm->mmap_sem); |
824 | hold_task_mempolicy(priv); | |
f1547959 | 825 | |
258f669e VB |
826 | for (vma = priv->mm->mmap; vma; vma = vma->vm_next) { |
827 | smap_gather_stats(vma, &mss); | |
828 | last_vma_end = vma->vm_end; | |
493b0e9d | 829 | } |
258f669e VB |
830 | |
831 | show_vma_header_prefix(m, priv->mm->mmap->vm_start, | |
832 | last_vma_end, 0, 0, 0, 0); | |
833 | seq_pad(m, ' '); | |
834 | seq_puts(m, "[rollup]\n"); | |
835 | ||
836 | __show_smap(m, &mss); | |
837 | ||
838 | release_task_mempolicy(priv); | |
839 | up_read(&mm->mmap_sem); | |
840 | mmput(mm); | |
841 | ||
842 | out_put_task: | |
843 | put_task_struct(priv->task); | |
844 | priv->task = NULL; | |
845 | ||
493b0e9d | 846 | return ret; |
e070ad49 | 847 | } |
d1be35cb | 848 | #undef SEQ_PUT_DEC |
e070ad49 | 849 | |
03a44825 | 850 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
851 | .start = m_start, |
852 | .next = m_next, | |
853 | .stop = m_stop, | |
871305bb | 854 | .show = show_smap |
a6198797 MM |
855 | }; |
856 | ||
b7643757 | 857 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
858 | { |
859 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
860 | } | |
861 | ||
258f669e | 862 | static int smaps_rollup_open(struct inode *inode, struct file *file) |
493b0e9d | 863 | { |
258f669e | 864 | int ret; |
493b0e9d | 865 | struct proc_maps_private *priv; |
258f669e VB |
866 | |
867 | priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); | |
868 | if (!priv) | |
493b0e9d | 869 | return -ENOMEM; |
258f669e VB |
870 | |
871 | ret = single_open(file, show_smaps_rollup, priv); | |
872 | if (ret) | |
873 | goto out_free; | |
874 | ||
875 | priv->inode = inode; | |
876 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); | |
877 | if (IS_ERR(priv->mm)) { | |
878 | ret = PTR_ERR(priv->mm); | |
879 | ||
880 | single_release(inode, file); | |
881 | goto out_free; | |
493b0e9d | 882 | } |
258f669e | 883 | |
493b0e9d | 884 | return 0; |
258f669e VB |
885 | |
886 | out_free: | |
887 | kfree(priv); | |
888 | return ret; | |
889 | } | |
890 | ||
891 | static int smaps_rollup_release(struct inode *inode, struct file *file) | |
892 | { | |
893 | struct seq_file *seq = file->private_data; | |
894 | struct proc_maps_private *priv = seq->private; | |
895 | ||
896 | if (priv->mm) | |
897 | mmdrop(priv->mm); | |
898 | ||
899 | kfree(priv); | |
900 | return single_release(inode, file); | |
493b0e9d DC |
901 | } |
902 | ||
b7643757 SP |
903 | const struct file_operations proc_pid_smaps_operations = { |
904 | .open = pid_smaps_open, | |
905 | .read = seq_read, | |
906 | .llseek = seq_lseek, | |
29a40ace | 907 | .release = proc_map_release, |
b7643757 SP |
908 | }; |
909 | ||
493b0e9d | 910 | const struct file_operations proc_pid_smaps_rollup_operations = { |
258f669e | 911 | .open = smaps_rollup_open, |
493b0e9d DC |
912 | .read = seq_read, |
913 | .llseek = seq_lseek, | |
258f669e | 914 | .release = smaps_rollup_release, |
493b0e9d DC |
915 | }; |
916 | ||
040fa020 PE |
917 | enum clear_refs_types { |
918 | CLEAR_REFS_ALL = 1, | |
919 | CLEAR_REFS_ANON, | |
920 | CLEAR_REFS_MAPPED, | |
0f8975ec | 921 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 922 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
923 | CLEAR_REFS_LAST, |
924 | }; | |
925 | ||
af9de7eb | 926 | struct clear_refs_private { |
0f8975ec | 927 | enum clear_refs_types type; |
af9de7eb PE |
928 | }; |
929 | ||
7d5b3bfa | 930 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
931 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
932 | unsigned long addr, pte_t *pte) | |
933 | { | |
0f8975ec PE |
934 | /* |
935 | * The soft-dirty tracker uses #PF-s to catch writes | |
936 | * to pages, so write-protect the pte as well. See the | |
1ad1335d | 937 | * Documentation/admin-guide/mm/soft-dirty.rst for full description |
0f8975ec PE |
938 | * of how soft-dirty works. |
939 | */ | |
940 | pte_t ptent = *pte; | |
179ef71c CG |
941 | |
942 | if (pte_present(ptent)) { | |
326c2597 | 943 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
179ef71c | 944 | ptent = pte_wrprotect(ptent); |
a7b76174 | 945 | ptent = pte_clear_soft_dirty(ptent); |
326c2597 | 946 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
179ef71c CG |
947 | } else if (is_swap_pte(ptent)) { |
948 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 949 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 950 | } |
0f8975ec | 951 | } |
5d3875a0 LD |
952 | #else |
953 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
954 | unsigned long addr, pte_t *pte) | |
955 | { | |
956 | } | |
957 | #endif | |
0f8975ec | 958 | |
5d3875a0 | 959 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
960 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
961 | unsigned long addr, pmd_t *pmdp) | |
962 | { | |
a3cf988f | 963 | pmd_t old, pmd = *pmdp; |
5b7abeae | 964 | |
ab6e3d09 NH |
965 | if (pmd_present(pmd)) { |
966 | /* See comment in change_huge_pmd() */ | |
a3cf988f KS |
967 | old = pmdp_invalidate(vma, addr, pmdp); |
968 | if (pmd_dirty(old)) | |
ab6e3d09 | 969 | pmd = pmd_mkdirty(pmd); |
a3cf988f | 970 | if (pmd_young(old)) |
ab6e3d09 NH |
971 | pmd = pmd_mkyoung(pmd); |
972 | ||
973 | pmd = pmd_wrprotect(pmd); | |
974 | pmd = pmd_clear_soft_dirty(pmd); | |
975 | ||
976 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
977 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
978 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
979 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
980 | } | |
7d5b3bfa | 981 | } |
7d5b3bfa | 982 | #else |
7d5b3bfa KS |
983 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
984 | unsigned long addr, pmd_t *pmdp) | |
985 | { | |
986 | } | |
987 | #endif | |
988 | ||
a6198797 | 989 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 990 | unsigned long end, struct mm_walk *walk) |
a6198797 | 991 | { |
af9de7eb | 992 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 993 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
994 | pte_t *pte, ptent; |
995 | spinlock_t *ptl; | |
996 | struct page *page; | |
997 | ||
b6ec57f4 KS |
998 | ptl = pmd_trans_huge_lock(pmd, vma); |
999 | if (ptl) { | |
7d5b3bfa KS |
1000 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1001 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1002 | goto out; | |
1003 | } | |
1004 | ||
84c3fc4e ZY |
1005 | if (!pmd_present(*pmd)) |
1006 | goto out; | |
1007 | ||
7d5b3bfa KS |
1008 | page = pmd_page(*pmd); |
1009 | ||
1010 | /* Clear accessed and referenced bits. */ | |
1011 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1012 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1013 | ClearPageReferenced(page); |
1014 | out: | |
1015 | spin_unlock(ptl); | |
1016 | return 0; | |
1017 | } | |
1018 | ||
1a5a9906 AA |
1019 | if (pmd_trans_unstable(pmd)) |
1020 | return 0; | |
03319327 | 1021 | |
a6198797 MM |
1022 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1023 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1024 | ptent = *pte; | |
a6198797 | 1025 | |
0f8975ec PE |
1026 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1027 | clear_soft_dirty(vma, addr, pte); | |
1028 | continue; | |
1029 | } | |
1030 | ||
179ef71c CG |
1031 | if (!pte_present(ptent)) |
1032 | continue; | |
1033 | ||
a6198797 MM |
1034 | page = vm_normal_page(vma, addr, ptent); |
1035 | if (!page) | |
1036 | continue; | |
1037 | ||
1038 | /* Clear accessed and referenced bits. */ | |
1039 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1040 | test_and_clear_page_young(page); |
a6198797 MM |
1041 | ClearPageReferenced(page); |
1042 | } | |
1043 | pte_unmap_unlock(pte - 1, ptl); | |
1044 | cond_resched(); | |
1045 | return 0; | |
1046 | } | |
1047 | ||
5c64f52a NH |
1048 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1049 | struct mm_walk *walk) | |
1050 | { | |
1051 | struct clear_refs_private *cp = walk->private; | |
1052 | struct vm_area_struct *vma = walk->vma; | |
1053 | ||
48684a65 NH |
1054 | if (vma->vm_flags & VM_PFNMAP) |
1055 | return 1; | |
1056 | ||
5c64f52a NH |
1057 | /* |
1058 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1059 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1060 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1061 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1062 | */ | |
1063 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1064 | return 1; | |
1065 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1066 | return 1; | |
1067 | return 0; | |
1068 | } | |
1069 | ||
f248dcb3 MM |
1070 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1071 | size_t count, loff_t *ppos) | |
b813e931 | 1072 | { |
f248dcb3 | 1073 | struct task_struct *task; |
fb92a4b0 | 1074 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1075 | struct mm_struct *mm; |
b813e931 | 1076 | struct vm_area_struct *vma; |
040fa020 | 1077 | enum clear_refs_types type; |
b3a81d08 | 1078 | struct mmu_gather tlb; |
040fa020 | 1079 | int itype; |
0a8cb8e3 | 1080 | int rv; |
b813e931 | 1081 | |
f248dcb3 MM |
1082 | memset(buffer, 0, sizeof(buffer)); |
1083 | if (count > sizeof(buffer) - 1) | |
1084 | count = sizeof(buffer) - 1; | |
1085 | if (copy_from_user(buffer, buf, count)) | |
1086 | return -EFAULT; | |
040fa020 | 1087 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1088 | if (rv < 0) |
1089 | return rv; | |
040fa020 PE |
1090 | type = (enum clear_refs_types)itype; |
1091 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1092 | return -EINVAL; |
541c237c | 1093 | |
496ad9aa | 1094 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1095 | if (!task) |
1096 | return -ESRCH; | |
1097 | mm = get_task_mm(task); | |
1098 | if (mm) { | |
af9de7eb | 1099 | struct clear_refs_private cp = { |
0f8975ec | 1100 | .type = type, |
af9de7eb | 1101 | }; |
20cbc972 AM |
1102 | struct mm_walk clear_refs_walk = { |
1103 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 1104 | .test_walk = clear_refs_test_walk, |
20cbc972 | 1105 | .mm = mm, |
af9de7eb | 1106 | .private = &cp, |
20cbc972 | 1107 | }; |
695f0559 PC |
1108 | |
1109 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
4e80153a MH |
1110 | if (down_write_killable(&mm->mmap_sem)) { |
1111 | count = -EINTR; | |
1112 | goto out_mm; | |
1113 | } | |
1114 | ||
695f0559 PC |
1115 | /* |
1116 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1117 | * resident set size to this mm's current rss value. | |
1118 | */ | |
695f0559 PC |
1119 | reset_mm_hiwater_rss(mm); |
1120 | up_write(&mm->mmap_sem); | |
1121 | goto out_mm; | |
1122 | } | |
1123 | ||
f248dcb3 | 1124 | down_read(&mm->mmap_sem); |
b3a81d08 | 1125 | tlb_gather_mmu(&tlb, mm, 0, -1); |
64e45507 PF |
1126 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1127 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1128 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1129 | continue; | |
1130 | up_read(&mm->mmap_sem); | |
4e80153a MH |
1131 | if (down_write_killable(&mm->mmap_sem)) { |
1132 | count = -EINTR; | |
1133 | goto out_mm; | |
1134 | } | |
64e45507 PF |
1135 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1136 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1137 | vma_set_page_prot(vma); | |
1138 | } | |
1139 | downgrade_write(&mm->mmap_sem); | |
1140 | break; | |
1141 | } | |
0f8975ec | 1142 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 1143 | } |
0f30206b | 1144 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
0f8975ec PE |
1145 | if (type == CLEAR_REFS_SOFT_DIRTY) |
1146 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
b3a81d08 | 1147 | tlb_finish_mmu(&tlb, 0, -1); |
f248dcb3 | 1148 | up_read(&mm->mmap_sem); |
695f0559 | 1149 | out_mm: |
f248dcb3 MM |
1150 | mmput(mm); |
1151 | } | |
1152 | put_task_struct(task); | |
fb92a4b0 VL |
1153 | |
1154 | return count; | |
b813e931 DR |
1155 | } |
1156 | ||
f248dcb3 MM |
1157 | const struct file_operations proc_clear_refs_operations = { |
1158 | .write = clear_refs_write, | |
6038f373 | 1159 | .llseek = noop_llseek, |
f248dcb3 MM |
1160 | }; |
1161 | ||
092b50ba NH |
1162 | typedef struct { |
1163 | u64 pme; | |
1164 | } pagemap_entry_t; | |
1165 | ||
85863e47 | 1166 | struct pagemapread { |
8c829622 | 1167 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1168 | pagemap_entry_t *buffer; |
1c90308e | 1169 | bool show_pfn; |
85863e47 MM |
1170 | }; |
1171 | ||
5aaabe83 NH |
1172 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1173 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1174 | ||
deb94544 KK |
1175 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1176 | #define PM_PFRAME_BITS 55 | |
1177 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1178 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1179 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1180 | #define PM_FILE BIT_ULL(61) |
1181 | #define PM_SWAP BIT_ULL(62) | |
1182 | #define PM_PRESENT BIT_ULL(63) | |
1183 | ||
85863e47 MM |
1184 | #define PM_END_OF_BUFFER 1 |
1185 | ||
deb94544 | 1186 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1187 | { |
deb94544 | 1188 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1189 | } |
1190 | ||
1191 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1192 | struct pagemapread *pm) |
1193 | { | |
092b50ba | 1194 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1195 | if (pm->pos >= pm->len) |
aae8679b | 1196 | return PM_END_OF_BUFFER; |
85863e47 MM |
1197 | return 0; |
1198 | } | |
1199 | ||
1200 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1201 | struct mm_walk *walk) |
85863e47 | 1202 | { |
2165009b | 1203 | struct pagemapread *pm = walk->private; |
68b5a652 | 1204 | unsigned long addr = start; |
85863e47 | 1205 | int err = 0; |
092b50ba | 1206 | |
68b5a652 PF |
1207 | while (addr < end) { |
1208 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1209 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1210 | /* End of address space hole, which we mark as non-present. */ |
1211 | unsigned long hole_end; | |
68b5a652 | 1212 | |
87e6d49a PF |
1213 | if (vma) |
1214 | hole_end = min(end, vma->vm_start); | |
1215 | else | |
1216 | hole_end = end; | |
1217 | ||
1218 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1219 | err = add_to_pagemap(addr, &pme, pm); | |
1220 | if (err) | |
1221 | goto out; | |
68b5a652 PF |
1222 | } |
1223 | ||
87e6d49a PF |
1224 | if (!vma) |
1225 | break; | |
1226 | ||
1227 | /* Addresses in the VMA. */ | |
1228 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1229 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1230 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1231 | err = add_to_pagemap(addr, &pme, pm); |
1232 | if (err) | |
1233 | goto out; | |
1234 | } | |
85863e47 | 1235 | } |
68b5a652 | 1236 | out: |
85863e47 MM |
1237 | return err; |
1238 | } | |
1239 | ||
deb94544 | 1240 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1241 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1242 | { |
deb94544 | 1243 | u64 frame = 0, flags = 0; |
052fb0d6 | 1244 | struct page *page = NULL; |
85863e47 | 1245 | |
052fb0d6 | 1246 | if (pte_present(pte)) { |
1c90308e KK |
1247 | if (pm->show_pfn) |
1248 | frame = pte_pfn(pte); | |
deb94544 | 1249 | flags |= PM_PRESENT; |
df6ad698 | 1250 | page = _vm_normal_page(vma, addr, pte, true); |
e9cdd6e7 | 1251 | if (pte_soft_dirty(pte)) |
deb94544 | 1252 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1253 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1254 | swp_entry_t entry; |
1255 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1256 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1257 | entry = pte_to_swp_entry(pte); |
ab6ecf24 HY |
1258 | if (pm->show_pfn) |
1259 | frame = swp_type(entry) | | |
1260 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1261 | flags |= PM_SWAP; |
052fb0d6 KK |
1262 | if (is_migration_entry(entry)) |
1263 | page = migration_entry_to_page(entry); | |
5042db43 JG |
1264 | |
1265 | if (is_device_private_entry(entry)) | |
1266 | page = device_private_entry_to_page(entry); | |
052fb0d6 KK |
1267 | } |
1268 | ||
1269 | if (page && !PageAnon(page)) | |
1270 | flags |= PM_FILE; | |
77bb499b KK |
1271 | if (page && page_mapcount(page) == 1) |
1272 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1273 | if (vma->vm_flags & VM_SOFTDIRTY) |
1274 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1275 | |
deb94544 | 1276 | return make_pme(frame, flags); |
bcf8039e DH |
1277 | } |
1278 | ||
356515e7 | 1279 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1280 | struct mm_walk *walk) |
85863e47 | 1281 | { |
f995ece2 | 1282 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1283 | struct pagemapread *pm = walk->private; |
bf929152 | 1284 | spinlock_t *ptl; |
05fbf357 | 1285 | pte_t *pte, *orig_pte; |
85863e47 MM |
1286 | int err = 0; |
1287 | ||
356515e7 | 1288 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1289 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1290 | if (ptl) { | |
356515e7 KK |
1291 | u64 flags = 0, frame = 0; |
1292 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1293 | struct page *page = NULL; |
0f8975ec | 1294 | |
b83d7e43 | 1295 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1296 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1297 | |
356515e7 | 1298 | if (pmd_present(pmd)) { |
84c3fc4e | 1299 | page = pmd_page(pmd); |
77bb499b | 1300 | |
356515e7 | 1301 | flags |= PM_PRESENT; |
b83d7e43 HY |
1302 | if (pmd_soft_dirty(pmd)) |
1303 | flags |= PM_SOFT_DIRTY; | |
1c90308e KK |
1304 | if (pm->show_pfn) |
1305 | frame = pmd_pfn(pmd) + | |
1306 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1307 | } |
84c3fc4e ZY |
1308 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1309 | else if (is_swap_pmd(pmd)) { | |
1310 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
ab6ecf24 | 1311 | unsigned long offset; |
84c3fc4e | 1312 | |
ab6ecf24 HY |
1313 | if (pm->show_pfn) { |
1314 | offset = swp_offset(entry) + | |
1315 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
1316 | frame = swp_type(entry) | | |
1317 | (offset << MAX_SWAPFILES_SHIFT); | |
1318 | } | |
84c3fc4e | 1319 | flags |= PM_SWAP; |
b83d7e43 HY |
1320 | if (pmd_swp_soft_dirty(pmd)) |
1321 | flags |= PM_SOFT_DIRTY; | |
84c3fc4e ZY |
1322 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
1323 | page = migration_entry_to_page(entry); | |
1324 | } | |
1325 | #endif | |
1326 | ||
1327 | if (page && page_mapcount(page) == 1) | |
1328 | flags |= PM_MMAP_EXCLUSIVE; | |
356515e7 | 1329 | |
025c5b24 | 1330 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1331 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1332 | |
092b50ba | 1333 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1334 | if (err) |
1335 | break; | |
ab6ecf24 HY |
1336 | if (pm->show_pfn) { |
1337 | if (flags & PM_PRESENT) | |
1338 | frame++; | |
1339 | else if (flags & PM_SWAP) | |
1340 | frame += (1 << MAX_SWAPFILES_SHIFT); | |
1341 | } | |
5aaabe83 | 1342 | } |
bf929152 | 1343 | spin_unlock(ptl); |
025c5b24 | 1344 | return err; |
5aaabe83 NH |
1345 | } |
1346 | ||
356515e7 | 1347 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1348 | return 0; |
356515e7 | 1349 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1350 | |
f995ece2 NH |
1351 | /* |
1352 | * We can assume that @vma always points to a valid one and @end never | |
1353 | * goes beyond vma->vm_end. | |
1354 | */ | |
356515e7 | 1355 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1356 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1357 | pagemap_entry_t pme; | |
05fbf357 | 1358 | |
deb94544 | 1359 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1360 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1361 | if (err) |
81d0fa62 | 1362 | break; |
85863e47 | 1363 | } |
f995ece2 | 1364 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1365 | |
1366 | cond_resched(); | |
1367 | ||
1368 | return err; | |
1369 | } | |
1370 | ||
1a5cb814 | 1371 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1372 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1373 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1374 | unsigned long addr, unsigned long end, |
1375 | struct mm_walk *walk) | |
5dc37642 | 1376 | { |
5dc37642 | 1377 | struct pagemapread *pm = walk->private; |
f995ece2 | 1378 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1379 | u64 flags = 0, frame = 0; |
5dc37642 | 1380 | int err = 0; |
356515e7 | 1381 | pte_t pte; |
5dc37642 | 1382 | |
f995ece2 | 1383 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1384 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1385 | |
356515e7 KK |
1386 | pte = huge_ptep_get(ptep); |
1387 | if (pte_present(pte)) { | |
1388 | struct page *page = pte_page(pte); | |
1389 | ||
1390 | if (!PageAnon(page)) | |
1391 | flags |= PM_FILE; | |
1392 | ||
77bb499b KK |
1393 | if (page_mapcount(page) == 1) |
1394 | flags |= PM_MMAP_EXCLUSIVE; | |
1395 | ||
356515e7 | 1396 | flags |= PM_PRESENT; |
1c90308e KK |
1397 | if (pm->show_pfn) |
1398 | frame = pte_pfn(pte) + | |
1399 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1400 | } |
1401 | ||
5dc37642 | 1402 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1403 | pagemap_entry_t pme = make_pme(frame, flags); |
1404 | ||
092b50ba | 1405 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1406 | if (err) |
1407 | return err; | |
1c90308e | 1408 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1409 | frame++; |
5dc37642 NH |
1410 | } |
1411 | ||
1412 | cond_resched(); | |
1413 | ||
1414 | return err; | |
1415 | } | |
1a5cb814 | 1416 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1417 | |
85863e47 MM |
1418 | /* |
1419 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1420 | * | |
f16278c6 HR |
1421 | * For each page in the address space, this file contains one 64-bit entry |
1422 | * consisting of the following: | |
1423 | * | |
052fb0d6 | 1424 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1425 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1426 | * Bits 5-54 swap offset if swapped |
1ad1335d | 1427 | * Bit 55 pte is soft-dirty (see Documentation/admin-guide/mm/soft-dirty.rst) |
77bb499b KK |
1428 | * Bit 56 page exclusively mapped |
1429 | * Bits 57-60 zero | |
052fb0d6 | 1430 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1431 | * Bit 62 page swapped |
1432 | * Bit 63 page present | |
1433 | * | |
1434 | * If the page is not present but in swap, then the PFN contains an | |
1435 | * encoding of the swap file number and the page's offset into the | |
1436 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1437 | * precisely which pages are mapped (or in swap) and comparing mapped |
1438 | * pages between processes. | |
1439 | * | |
1440 | * Efficient users of this interface will use /proc/pid/maps to | |
1441 | * determine which areas of memory are actually mapped and llseek to | |
1442 | * skip over unmapped regions. | |
1443 | */ | |
1444 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1445 | size_t count, loff_t *ppos) | |
1446 | { | |
a06db751 | 1447 | struct mm_struct *mm = file->private_data; |
85863e47 | 1448 | struct pagemapread pm; |
ee1e6ab6 | 1449 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1450 | unsigned long src; |
1451 | unsigned long svpfn; | |
1452 | unsigned long start_vaddr; | |
1453 | unsigned long end_vaddr; | |
a06db751 | 1454 | int ret = 0, copied = 0; |
85863e47 | 1455 | |
388f7934 | 1456 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1457 | goto out; |
1458 | ||
85863e47 MM |
1459 | ret = -EINVAL; |
1460 | /* file position must be aligned */ | |
aae8679b | 1461 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1462 | goto out_mm; |
85863e47 MM |
1463 | |
1464 | ret = 0; | |
08161786 | 1465 | if (!count) |
a06db751 | 1466 | goto out_mm; |
08161786 | 1467 | |
1c90308e KK |
1468 | /* do not disclose physical addresses: attack vector */ |
1469 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1470 | ||
8c829622 | 1471 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
6da2ec56 | 1472 | pm.buffer = kmalloc_array(pm.len, PM_ENTRY_BYTES, GFP_KERNEL); |
5d7e0d2b | 1473 | ret = -ENOMEM; |
d82ef020 | 1474 | if (!pm.buffer) |
a06db751 | 1475 | goto out_mm; |
85863e47 | 1476 | |
356515e7 | 1477 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1478 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1479 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1480 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1481 | #endif |
5d7e0d2b AM |
1482 | pagemap_walk.mm = mm; |
1483 | pagemap_walk.private = ± | |
1484 | ||
1485 | src = *ppos; | |
1486 | svpfn = src / PM_ENTRY_BYTES; | |
1487 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1488 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1489 | |
1490 | /* watch out for wraparound */ | |
a06db751 | 1491 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1492 | start_vaddr = end_vaddr; |
1493 | ||
1494 | /* | |
1495 | * The odds are that this will stop walking way | |
1496 | * before end_vaddr, because the length of the | |
1497 | * user buffer is tracked in "pm", and the walk | |
1498 | * will stop when we hit the end of the buffer. | |
1499 | */ | |
d82ef020 KH |
1500 | ret = 0; |
1501 | while (count && (start_vaddr < end_vaddr)) { | |
1502 | int len; | |
1503 | unsigned long end; | |
1504 | ||
1505 | pm.pos = 0; | |
ea251c1d | 1506 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1507 | /* overflow ? */ |
1508 | if (end < start_vaddr || end > end_vaddr) | |
1509 | end = end_vaddr; | |
1510 | down_read(&mm->mmap_sem); | |
1511 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1512 | up_read(&mm->mmap_sem); | |
1513 | start_vaddr = end; | |
1514 | ||
1515 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1516 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1517 | ret = -EFAULT; |
a06db751 | 1518 | goto out_free; |
d82ef020 KH |
1519 | } |
1520 | copied += len; | |
1521 | buf += len; | |
1522 | count -= len; | |
85863e47 | 1523 | } |
d82ef020 KH |
1524 | *ppos += copied; |
1525 | if (!ret || ret == PM_END_OF_BUFFER) | |
1526 | ret = copied; | |
1527 | ||
98bc93e5 KM |
1528 | out_free: |
1529 | kfree(pm.buffer); | |
a06db751 KK |
1530 | out_mm: |
1531 | mmput(mm); | |
85863e47 MM |
1532 | out: |
1533 | return ret; | |
1534 | } | |
1535 | ||
541c237c PE |
1536 | static int pagemap_open(struct inode *inode, struct file *file) |
1537 | { | |
a06db751 KK |
1538 | struct mm_struct *mm; |
1539 | ||
a06db751 KK |
1540 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1541 | if (IS_ERR(mm)) | |
1542 | return PTR_ERR(mm); | |
1543 | file->private_data = mm; | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | static int pagemap_release(struct inode *inode, struct file *file) | |
1548 | { | |
1549 | struct mm_struct *mm = file->private_data; | |
1550 | ||
1551 | if (mm) | |
1552 | mmdrop(mm); | |
541c237c PE |
1553 | return 0; |
1554 | } | |
1555 | ||
85863e47 MM |
1556 | const struct file_operations proc_pagemap_operations = { |
1557 | .llseek = mem_lseek, /* borrow this */ | |
1558 | .read = pagemap_read, | |
541c237c | 1559 | .open = pagemap_open, |
a06db751 | 1560 | .release = pagemap_release, |
85863e47 | 1561 | }; |
1e883281 | 1562 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1563 | |
6e21c8f1 | 1564 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1565 | |
f69ff943 | 1566 | struct numa_maps { |
f69ff943 SW |
1567 | unsigned long pages; |
1568 | unsigned long anon; | |
1569 | unsigned long active; | |
1570 | unsigned long writeback; | |
1571 | unsigned long mapcount_max; | |
1572 | unsigned long dirty; | |
1573 | unsigned long swapcache; | |
1574 | unsigned long node[MAX_NUMNODES]; | |
1575 | }; | |
1576 | ||
5b52fc89 SW |
1577 | struct numa_maps_private { |
1578 | struct proc_maps_private proc_maps; | |
1579 | struct numa_maps md; | |
1580 | }; | |
1581 | ||
eb4866d0 DH |
1582 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1583 | unsigned long nr_pages) | |
f69ff943 SW |
1584 | { |
1585 | int count = page_mapcount(page); | |
1586 | ||
eb4866d0 | 1587 | md->pages += nr_pages; |
f69ff943 | 1588 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1589 | md->dirty += nr_pages; |
f69ff943 SW |
1590 | |
1591 | if (PageSwapCache(page)) | |
eb4866d0 | 1592 | md->swapcache += nr_pages; |
f69ff943 SW |
1593 | |
1594 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1595 | md->active += nr_pages; |
f69ff943 SW |
1596 | |
1597 | if (PageWriteback(page)) | |
eb4866d0 | 1598 | md->writeback += nr_pages; |
f69ff943 SW |
1599 | |
1600 | if (PageAnon(page)) | |
eb4866d0 | 1601 | md->anon += nr_pages; |
f69ff943 SW |
1602 | |
1603 | if (count > md->mapcount_max) | |
1604 | md->mapcount_max = count; | |
1605 | ||
eb4866d0 | 1606 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1607 | } |
1608 | ||
3200a8aa DH |
1609 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1610 | unsigned long addr) | |
1611 | { | |
1612 | struct page *page; | |
1613 | int nid; | |
1614 | ||
1615 | if (!pte_present(pte)) | |
1616 | return NULL; | |
1617 | ||
1618 | page = vm_normal_page(vma, addr, pte); | |
1619 | if (!page) | |
1620 | return NULL; | |
1621 | ||
1622 | if (PageReserved(page)) | |
1623 | return NULL; | |
1624 | ||
1625 | nid = page_to_nid(page); | |
4ff1b2c2 | 1626 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1627 | return NULL; |
1628 | ||
1629 | return page; | |
1630 | } | |
1631 | ||
28093f9f GS |
1632 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1633 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1634 | struct vm_area_struct *vma, | |
1635 | unsigned long addr) | |
1636 | { | |
1637 | struct page *page; | |
1638 | int nid; | |
1639 | ||
1640 | if (!pmd_present(pmd)) | |
1641 | return NULL; | |
1642 | ||
1643 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1644 | if (!page) | |
1645 | return NULL; | |
1646 | ||
1647 | if (PageReserved(page)) | |
1648 | return NULL; | |
1649 | ||
1650 | nid = page_to_nid(page); | |
1651 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1652 | return NULL; | |
1653 | ||
1654 | return page; | |
1655 | } | |
1656 | #endif | |
1657 | ||
f69ff943 SW |
1658 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1659 | unsigned long end, struct mm_walk *walk) | |
1660 | { | |
d85f4d6d NH |
1661 | struct numa_maps *md = walk->private; |
1662 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1663 | spinlock_t *ptl; |
1664 | pte_t *orig_pte; | |
1665 | pte_t *pte; | |
1666 | ||
28093f9f | 1667 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1668 | ptl = pmd_trans_huge_lock(pmd, vma); |
1669 | if (ptl) { | |
025c5b24 NH |
1670 | struct page *page; |
1671 | ||
28093f9f | 1672 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1673 | if (page) |
28093f9f | 1674 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1675 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1676 | spin_unlock(ptl); |
025c5b24 | 1677 | return 0; |
32ef4384 DH |
1678 | } |
1679 | ||
1a5a9906 AA |
1680 | if (pmd_trans_unstable(pmd)) |
1681 | return 0; | |
28093f9f | 1682 | #endif |
f69ff943 SW |
1683 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1684 | do { | |
d85f4d6d | 1685 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1686 | if (!page) |
1687 | continue; | |
eb4866d0 | 1688 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1689 | |
1690 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1691 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1692 | cond_resched(); |
f69ff943 SW |
1693 | return 0; |
1694 | } | |
1695 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1696 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1697 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1698 | { | |
5c2ff95e | 1699 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1700 | struct numa_maps *md; |
1701 | struct page *page; | |
1702 | ||
5c2ff95e | 1703 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1704 | return 0; |
1705 | ||
5c2ff95e | 1706 | page = pte_page(huge_pte); |
f69ff943 SW |
1707 | if (!page) |
1708 | return 0; | |
1709 | ||
1710 | md = walk->private; | |
5c2ff95e | 1711 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1712 | return 0; |
1713 | } | |
1714 | ||
1715 | #else | |
632fd60f | 1716 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1717 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1718 | { | |
1719 | return 0; | |
1720 | } | |
1721 | #endif | |
1722 | ||
1723 | /* | |
1724 | * Display pages allocated per node and memory policy via /proc. | |
1725 | */ | |
871305bb | 1726 | static int show_numa_map(struct seq_file *m, void *v) |
f69ff943 | 1727 | { |
5b52fc89 SW |
1728 | struct numa_maps_private *numa_priv = m->private; |
1729 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1730 | struct vm_area_struct *vma = v; |
5b52fc89 | 1731 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1732 | struct file *file = vma->vm_file; |
1733 | struct mm_struct *mm = vma->vm_mm; | |
d85f4d6d NH |
1734 | struct mm_walk walk = { |
1735 | .hugetlb_entry = gather_hugetlb_stats, | |
1736 | .pmd_entry = gather_pte_stats, | |
1737 | .private = md, | |
1738 | .mm = mm, | |
1739 | }; | |
f69ff943 | 1740 | struct mempolicy *pol; |
948927ee DR |
1741 | char buffer[64]; |
1742 | int nid; | |
f69ff943 SW |
1743 | |
1744 | if (!mm) | |
1745 | return 0; | |
1746 | ||
5b52fc89 SW |
1747 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1748 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1749 | |
498f2371 ON |
1750 | pol = __get_vma_policy(vma, vma->vm_start); |
1751 | if (pol) { | |
1752 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1753 | mpol_cond_put(pol); | |
1754 | } else { | |
1755 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1756 | } | |
f69ff943 SW |
1757 | |
1758 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1759 | ||
1760 | if (file) { | |
17c2b4ee | 1761 | seq_puts(m, " file="); |
2726d566 | 1762 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1763 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1764 | seq_puts(m, " heap"); |
1240ea0d | 1765 | } else if (is_stack(vma)) { |
65376df5 | 1766 | seq_puts(m, " stack"); |
f69ff943 SW |
1767 | } |
1768 | ||
fc360bd9 | 1769 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1770 | seq_puts(m, " huge"); |
fc360bd9 | 1771 | |
d85f4d6d NH |
1772 | /* mmap_sem is held by m_start */ |
1773 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1774 | |
1775 | if (!md->pages) | |
1776 | goto out; | |
1777 | ||
1778 | if (md->anon) | |
1779 | seq_printf(m, " anon=%lu", md->anon); | |
1780 | ||
1781 | if (md->dirty) | |
1782 | seq_printf(m, " dirty=%lu", md->dirty); | |
1783 | ||
1784 | if (md->pages != md->anon && md->pages != md->dirty) | |
1785 | seq_printf(m, " mapped=%lu", md->pages); | |
1786 | ||
1787 | if (md->mapcount_max > 1) | |
1788 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1789 | ||
1790 | if (md->swapcache) | |
1791 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1792 | ||
1793 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1794 | seq_printf(m, " active=%lu", md->active); | |
1795 | ||
1796 | if (md->writeback) | |
1797 | seq_printf(m, " writeback=%lu", md->writeback); | |
1798 | ||
948927ee DR |
1799 | for_each_node_state(nid, N_MEMORY) |
1800 | if (md->node[nid]) | |
1801 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1802 | |
1803 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1804 | out: |
1805 | seq_putc(m, '\n'); | |
b8c20a9b | 1806 | m_cache_vma(m, vma); |
f69ff943 SW |
1807 | return 0; |
1808 | } | |
5b52fc89 | 1809 | |
03a44825 | 1810 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1811 | .start = m_start, |
1812 | .next = m_next, | |
1813 | .stop = m_stop, | |
871305bb | 1814 | .show = show_numa_map, |
6e21c8f1 | 1815 | }; |
662795de | 1816 | |
b7643757 SP |
1817 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1818 | { | |
871305bb VB |
1819 | return proc_maps_open(inode, file, &proc_pid_numa_maps_op, |
1820 | sizeof(struct numa_maps_private)); | |
b7643757 SP |
1821 | } |
1822 | ||
1823 | const struct file_operations proc_pid_numa_maps_operations = { | |
1824 | .open = pid_numa_maps_open, | |
1825 | .read = seq_read, | |
1826 | .llseek = seq_lseek, | |
29a40ace | 1827 | .release = proc_map_release, |
b7643757 SP |
1828 | }; |
1829 | ||
f69ff943 | 1830 | #endif /* CONFIG_NUMA */ |