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Commit | Line | Data |
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1da177e4 | 1 | #include <linux/mm.h> |
615d6e87 | 2 | #include <linux/vmacache.h> |
1da177e4 | 3 | #include <linux/hugetlb.h> |
22e057c5 | 4 | #include <linux/huge_mm.h> |
1da177e4 LT |
5 | #include <linux/mount.h> |
6 | #include <linux/seq_file.h> | |
e070ad49 | 7 | #include <linux/highmem.h> |
5096add8 | 8 | #include <linux/ptrace.h> |
5a0e3ad6 | 9 | #include <linux/slab.h> |
6e21c8f1 CL |
10 | #include <linux/pagemap.h> |
11 | #include <linux/mempolicy.h> | |
22e057c5 | 12 | #include <linux/rmap.h> |
85863e47 | 13 | #include <linux/swap.h> |
6e84f315 | 14 | #include <linux/sched/mm.h> |
85863e47 | 15 | #include <linux/swapops.h> |
0f8975ec | 16 | #include <linux/mmu_notifier.h> |
33c3fc71 | 17 | #include <linux/page_idle.h> |
6a15a370 | 18 | #include <linux/shmem_fs.h> |
b3a81d08 | 19 | #include <linux/uaccess.h> |
e070ad49 | 20 | |
1da177e4 | 21 | #include <asm/elf.h> |
b3a81d08 | 22 | #include <asm/tlb.h> |
e070ad49 | 23 | #include <asm/tlbflush.h> |
1da177e4 LT |
24 | #include "internal.h" |
25 | ||
df5f8314 | 26 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
1da177e4 | 27 | { |
84638335 | 28 | unsigned long text, lib, swap, ptes, pmds, anon, file, shmem; |
365e9c87 HD |
29 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
30 | ||
8cee852e JM |
31 | anon = get_mm_counter(mm, MM_ANONPAGES); |
32 | file = get_mm_counter(mm, MM_FILEPAGES); | |
33 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); | |
34 | ||
365e9c87 HD |
35 | /* |
36 | * Note: to minimize their overhead, mm maintains hiwater_vm and | |
37 | * hiwater_rss only when about to *lower* total_vm or rss. Any | |
38 | * collector of these hiwater stats must therefore get total_vm | |
39 | * and rss too, which will usually be the higher. Barriers? not | |
40 | * worth the effort, such snapshots can always be inconsistent. | |
41 | */ | |
42 | hiwater_vm = total_vm = mm->total_vm; | |
43 | if (hiwater_vm < mm->hiwater_vm) | |
44 | hiwater_vm = mm->hiwater_vm; | |
8cee852e | 45 | hiwater_rss = total_rss = anon + file + shmem; |
365e9c87 HD |
46 | if (hiwater_rss < mm->hiwater_rss) |
47 | hiwater_rss = mm->hiwater_rss; | |
1da177e4 | 48 | |
1da177e4 LT |
49 | text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10; |
50 | lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text; | |
b084d435 | 51 | swap = get_mm_counter(mm, MM_SWAPENTS); |
dc6c9a35 KS |
52 | ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes); |
53 | pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm); | |
df5f8314 | 54 | seq_printf(m, |
365e9c87 | 55 | "VmPeak:\t%8lu kB\n" |
1da177e4 LT |
56 | "VmSize:\t%8lu kB\n" |
57 | "VmLck:\t%8lu kB\n" | |
bc3e53f6 | 58 | "VmPin:\t%8lu kB\n" |
365e9c87 | 59 | "VmHWM:\t%8lu kB\n" |
1da177e4 | 60 | "VmRSS:\t%8lu kB\n" |
8cee852e JM |
61 | "RssAnon:\t%8lu kB\n" |
62 | "RssFile:\t%8lu kB\n" | |
63 | "RssShmem:\t%8lu kB\n" | |
1da177e4 LT |
64 | "VmData:\t%8lu kB\n" |
65 | "VmStk:\t%8lu kB\n" | |
66 | "VmExe:\t%8lu kB\n" | |
67 | "VmLib:\t%8lu kB\n" | |
b084d435 | 68 | "VmPTE:\t%8lu kB\n" |
dc6c9a35 | 69 | "VmPMD:\t%8lu kB\n" |
b084d435 | 70 | "VmSwap:\t%8lu kB\n", |
365e9c87 | 71 | hiwater_vm << (PAGE_SHIFT-10), |
314e51b9 | 72 | total_vm << (PAGE_SHIFT-10), |
1da177e4 | 73 | mm->locked_vm << (PAGE_SHIFT-10), |
bc3e53f6 | 74 | mm->pinned_vm << (PAGE_SHIFT-10), |
365e9c87 HD |
75 | hiwater_rss << (PAGE_SHIFT-10), |
76 | total_rss << (PAGE_SHIFT-10), | |
8cee852e JM |
77 | anon << (PAGE_SHIFT-10), |
78 | file << (PAGE_SHIFT-10), | |
79 | shmem << (PAGE_SHIFT-10), | |
84638335 | 80 | mm->data_vm << (PAGE_SHIFT-10), |
1da177e4 | 81 | mm->stack_vm << (PAGE_SHIFT-10), text, lib, |
dc6c9a35 KS |
82 | ptes >> 10, |
83 | pmds >> 10, | |
b084d435 | 84 | swap << (PAGE_SHIFT-10)); |
5d317b2b | 85 | hugetlb_report_usage(m, mm); |
1da177e4 LT |
86 | } |
87 | ||
88 | unsigned long task_vsize(struct mm_struct *mm) | |
89 | { | |
90 | return PAGE_SIZE * mm->total_vm; | |
91 | } | |
92 | ||
a2ade7b6 AD |
93 | unsigned long task_statm(struct mm_struct *mm, |
94 | unsigned long *shared, unsigned long *text, | |
95 | unsigned long *data, unsigned long *resident) | |
1da177e4 | 96 | { |
eca56ff9 JM |
97 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
98 | get_mm_counter(mm, MM_SHMEMPAGES); | |
1da177e4 LT |
99 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
100 | >> PAGE_SHIFT; | |
84638335 | 101 | *data = mm->data_vm + mm->stack_vm; |
d559db08 | 102 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
1da177e4 LT |
103 | return mm->total_vm; |
104 | } | |
105 | ||
9e781440 KH |
106 | #ifdef CONFIG_NUMA |
107 | /* | |
498f2371 | 108 | * Save get_task_policy() for show_numa_map(). |
9e781440 KH |
109 | */ |
110 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
111 | { | |
112 | struct task_struct *task = priv->task; | |
113 | ||
114 | task_lock(task); | |
498f2371 | 115 | priv->task_mempolicy = get_task_policy(task); |
9e781440 KH |
116 | mpol_get(priv->task_mempolicy); |
117 | task_unlock(task); | |
118 | } | |
119 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
120 | { | |
121 | mpol_put(priv->task_mempolicy); | |
122 | } | |
123 | #else | |
124 | static void hold_task_mempolicy(struct proc_maps_private *priv) | |
125 | { | |
126 | } | |
127 | static void release_task_mempolicy(struct proc_maps_private *priv) | |
128 | { | |
129 | } | |
130 | #endif | |
131 | ||
59b4bf12 | 132 | static void vma_stop(struct proc_maps_private *priv) |
a6198797 | 133 | { |
59b4bf12 ON |
134 | struct mm_struct *mm = priv->mm; |
135 | ||
136 | release_task_mempolicy(priv); | |
137 | up_read(&mm->mmap_sem); | |
138 | mmput(mm); | |
a6198797 | 139 | } |
ec4dd3eb | 140 | |
ad2a00e4 ON |
141 | static struct vm_area_struct * |
142 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) | |
143 | { | |
144 | if (vma == priv->tail_vma) | |
145 | return NULL; | |
146 | return vma->vm_next ?: priv->tail_vma; | |
147 | } | |
148 | ||
b8c20a9b ON |
149 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
150 | { | |
151 | if (m->count < m->size) /* vma is copied successfully */ | |
855af072 | 152 | m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL; |
b8c20a9b ON |
153 | } |
154 | ||
0c255321 | 155 | static void *m_start(struct seq_file *m, loff_t *ppos) |
e070ad49 | 156 | { |
a6198797 | 157 | struct proc_maps_private *priv = m->private; |
b8c20a9b | 158 | unsigned long last_addr = m->version; |
a6198797 | 159 | struct mm_struct *mm; |
0c255321 ON |
160 | struct vm_area_struct *vma; |
161 | unsigned int pos = *ppos; | |
a6198797 | 162 | |
b8c20a9b ON |
163 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
164 | if (last_addr == -1UL) | |
165 | return NULL; | |
166 | ||
2c03376d | 167 | priv->task = get_proc_task(priv->inode); |
a6198797 | 168 | if (!priv->task) |
ec6fd8a4 | 169 | return ERR_PTR(-ESRCH); |
a6198797 | 170 | |
29a40ace | 171 | mm = priv->mm; |
388f7934 | 172 | if (!mm || !mmget_not_zero(mm)) |
29a40ace | 173 | return NULL; |
a6198797 | 174 | |
0c255321 | 175 | down_read(&mm->mmap_sem); |
9e781440 | 176 | hold_task_mempolicy(priv); |
0c255321 | 177 | priv->tail_vma = get_gate_vma(mm); |
a6198797 | 178 | |
b8c20a9b | 179 | if (last_addr) { |
855af072 RH |
180 | vma = find_vma(mm, last_addr - 1); |
181 | if (vma && vma->vm_start <= last_addr) | |
182 | vma = m_next_vma(priv, vma); | |
183 | if (vma) | |
b8c20a9b ON |
184 | return vma; |
185 | } | |
186 | ||
187 | m->version = 0; | |
0c255321 | 188 | if (pos < mm->map_count) { |
557c2d8a ON |
189 | for (vma = mm->mmap; pos; pos--) { |
190 | m->version = vma->vm_start; | |
a6198797 | 191 | vma = vma->vm_next; |
557c2d8a | 192 | } |
a6198797 | 193 | return vma; |
0c255321 | 194 | } |
a6198797 | 195 | |
557c2d8a | 196 | /* we do not bother to update m->version in this case */ |
0c255321 ON |
197 | if (pos == mm->map_count && priv->tail_vma) |
198 | return priv->tail_vma; | |
59b4bf12 ON |
199 | |
200 | vma_stop(priv); | |
201 | return NULL; | |
a6198797 MM |
202 | } |
203 | ||
204 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) | |
205 | { | |
206 | struct proc_maps_private *priv = m->private; | |
ad2a00e4 | 207 | struct vm_area_struct *next; |
a6198797 MM |
208 | |
209 | (*pos)++; | |
ad2a00e4 | 210 | next = m_next_vma(priv, v); |
59b4bf12 ON |
211 | if (!next) |
212 | vma_stop(priv); | |
213 | return next; | |
a6198797 MM |
214 | } |
215 | ||
216 | static void m_stop(struct seq_file *m, void *v) | |
217 | { | |
218 | struct proc_maps_private *priv = m->private; | |
a6198797 | 219 | |
59b4bf12 ON |
220 | if (!IS_ERR_OR_NULL(v)) |
221 | vma_stop(priv); | |
0d5f5f45 | 222 | if (priv->task) { |
a6198797 | 223 | put_task_struct(priv->task); |
0d5f5f45 ON |
224 | priv->task = NULL; |
225 | } | |
a6198797 MM |
226 | } |
227 | ||
4db7d0ee ON |
228 | static int proc_maps_open(struct inode *inode, struct file *file, |
229 | const struct seq_operations *ops, int psize) | |
230 | { | |
231 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); | |
232 | ||
233 | if (!priv) | |
234 | return -ENOMEM; | |
235 | ||
2c03376d | 236 | priv->inode = inode; |
29a40ace ON |
237 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
238 | if (IS_ERR(priv->mm)) { | |
239 | int err = PTR_ERR(priv->mm); | |
240 | ||
241 | seq_release_private(inode, file); | |
242 | return err; | |
243 | } | |
244 | ||
4db7d0ee ON |
245 | return 0; |
246 | } | |
247 | ||
29a40ace ON |
248 | static int proc_map_release(struct inode *inode, struct file *file) |
249 | { | |
250 | struct seq_file *seq = file->private_data; | |
251 | struct proc_maps_private *priv = seq->private; | |
252 | ||
253 | if (priv->mm) | |
254 | mmdrop(priv->mm); | |
255 | ||
493b0e9d | 256 | kfree(priv->rollup); |
29a40ace ON |
257 | return seq_release_private(inode, file); |
258 | } | |
259 | ||
a6198797 | 260 | static int do_maps_open(struct inode *inode, struct file *file, |
03a44825 | 261 | const struct seq_operations *ops) |
a6198797 | 262 | { |
4db7d0ee ON |
263 | return proc_maps_open(inode, file, ops, |
264 | sizeof(struct proc_maps_private)); | |
a6198797 | 265 | } |
e070ad49 | 266 | |
65376df5 JW |
267 | /* |
268 | * Indicate if the VMA is a stack for the given task; for | |
269 | * /proc/PID/maps that is the stack of the main task. | |
270 | */ | |
271 | static int is_stack(struct proc_maps_private *priv, | |
b18cb64e | 272 | struct vm_area_struct *vma) |
58cb6548 | 273 | { |
b18cb64e AL |
274 | /* |
275 | * We make no effort to guess what a given thread considers to be | |
276 | * its "stack". It's not even well-defined for programs written | |
277 | * languages like Go. | |
278 | */ | |
279 | return vma->vm_start <= vma->vm_mm->start_stack && | |
280 | vma->vm_end >= vma->vm_mm->start_stack; | |
58cb6548 ON |
281 | } |
282 | ||
493b0e9d DC |
283 | static void show_vma_header_prefix(struct seq_file *m, |
284 | unsigned long start, unsigned long end, | |
285 | vm_flags_t flags, unsigned long long pgoff, | |
286 | dev_t dev, unsigned long ino) | |
287 | { | |
288 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); | |
289 | seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", | |
290 | start, | |
291 | end, | |
292 | flags & VM_READ ? 'r' : '-', | |
293 | flags & VM_WRITE ? 'w' : '-', | |
294 | flags & VM_EXEC ? 'x' : '-', | |
295 | flags & VM_MAYSHARE ? 's' : 'p', | |
296 | pgoff, | |
297 | MAJOR(dev), MINOR(dev), ino); | |
298 | } | |
299 | ||
b7643757 SP |
300 | static void |
301 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) | |
1da177e4 | 302 | { |
e070ad49 ML |
303 | struct mm_struct *mm = vma->vm_mm; |
304 | struct file *file = vma->vm_file; | |
b7643757 | 305 | struct proc_maps_private *priv = m->private; |
ca16d140 | 306 | vm_flags_t flags = vma->vm_flags; |
1da177e4 | 307 | unsigned long ino = 0; |
6260a4b0 | 308 | unsigned long long pgoff = 0; |
a09a79f6 | 309 | unsigned long start, end; |
1da177e4 | 310 | dev_t dev = 0; |
b7643757 | 311 | const char *name = NULL; |
1da177e4 LT |
312 | |
313 | if (file) { | |
496ad9aa | 314 | struct inode *inode = file_inode(vma->vm_file); |
1da177e4 LT |
315 | dev = inode->i_sb->s_dev; |
316 | ino = inode->i_ino; | |
6260a4b0 | 317 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
1da177e4 LT |
318 | } |
319 | ||
d7824370 | 320 | start = vma->vm_start; |
a09a79f6 | 321 | end = vma->vm_end; |
493b0e9d | 322 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
1da177e4 LT |
323 | |
324 | /* | |
325 | * Print the dentry name for named mappings, and a | |
326 | * special [heap] marker for the heap: | |
327 | */ | |
e070ad49 | 328 | if (file) { |
652586df | 329 | seq_pad(m, ' '); |
2726d566 | 330 | seq_file_path(m, file, "\n"); |
b7643757 SP |
331 | goto done; |
332 | } | |
333 | ||
78d683e8 AL |
334 | if (vma->vm_ops && vma->vm_ops->name) { |
335 | name = vma->vm_ops->name(vma); | |
336 | if (name) | |
337 | goto done; | |
338 | } | |
339 | ||
b7643757 SP |
340 | name = arch_vma_name(vma); |
341 | if (!name) { | |
b7643757 SP |
342 | if (!mm) { |
343 | name = "[vdso]"; | |
344 | goto done; | |
345 | } | |
346 | ||
347 | if (vma->vm_start <= mm->brk && | |
348 | vma->vm_end >= mm->start_brk) { | |
349 | name = "[heap]"; | |
350 | goto done; | |
351 | } | |
352 | ||
b18cb64e | 353 | if (is_stack(priv, vma)) |
65376df5 | 354 | name = "[stack]"; |
b7643757 SP |
355 | } |
356 | ||
357 | done: | |
358 | if (name) { | |
652586df | 359 | seq_pad(m, ' '); |
b7643757 | 360 | seq_puts(m, name); |
1da177e4 LT |
361 | } |
362 | seq_putc(m, '\n'); | |
7c88db0c JK |
363 | } |
364 | ||
b7643757 | 365 | static int show_map(struct seq_file *m, void *v, int is_pid) |
7c88db0c | 366 | { |
ebb6cdde | 367 | show_map_vma(m, v, is_pid); |
b8c20a9b | 368 | m_cache_vma(m, v); |
1da177e4 LT |
369 | return 0; |
370 | } | |
371 | ||
b7643757 SP |
372 | static int show_pid_map(struct seq_file *m, void *v) |
373 | { | |
374 | return show_map(m, v, 1); | |
375 | } | |
376 | ||
377 | static int show_tid_map(struct seq_file *m, void *v) | |
378 | { | |
379 | return show_map(m, v, 0); | |
380 | } | |
381 | ||
03a44825 | 382 | static const struct seq_operations proc_pid_maps_op = { |
a6198797 MM |
383 | .start = m_start, |
384 | .next = m_next, | |
385 | .stop = m_stop, | |
b7643757 SP |
386 | .show = show_pid_map |
387 | }; | |
388 | ||
389 | static const struct seq_operations proc_tid_maps_op = { | |
390 | .start = m_start, | |
391 | .next = m_next, | |
392 | .stop = m_stop, | |
393 | .show = show_tid_map | |
a6198797 MM |
394 | }; |
395 | ||
b7643757 | 396 | static int pid_maps_open(struct inode *inode, struct file *file) |
a6198797 MM |
397 | { |
398 | return do_maps_open(inode, file, &proc_pid_maps_op); | |
399 | } | |
400 | ||
b7643757 SP |
401 | static int tid_maps_open(struct inode *inode, struct file *file) |
402 | { | |
403 | return do_maps_open(inode, file, &proc_tid_maps_op); | |
404 | } | |
405 | ||
406 | const struct file_operations proc_pid_maps_operations = { | |
407 | .open = pid_maps_open, | |
408 | .read = seq_read, | |
409 | .llseek = seq_lseek, | |
29a40ace | 410 | .release = proc_map_release, |
b7643757 SP |
411 | }; |
412 | ||
413 | const struct file_operations proc_tid_maps_operations = { | |
414 | .open = tid_maps_open, | |
a6198797 MM |
415 | .read = seq_read, |
416 | .llseek = seq_lseek, | |
29a40ace | 417 | .release = proc_map_release, |
a6198797 MM |
418 | }; |
419 | ||
420 | /* | |
421 | * Proportional Set Size(PSS): my share of RSS. | |
422 | * | |
423 | * PSS of a process is the count of pages it has in memory, where each | |
424 | * page is divided by the number of processes sharing it. So if a | |
425 | * process has 1000 pages all to itself, and 1000 shared with one other | |
426 | * process, its PSS will be 1500. | |
427 | * | |
428 | * To keep (accumulated) division errors low, we adopt a 64bit | |
429 | * fixed-point pss counter to minimize division errors. So (pss >> | |
430 | * PSS_SHIFT) would be the real byte count. | |
431 | * | |
432 | * A shift of 12 before division means (assuming 4K page size): | |
433 | * - 1M 3-user-pages add up to 8KB errors; | |
434 | * - supports mapcount up to 2^24, or 16M; | |
435 | * - supports PSS up to 2^52 bytes, or 4PB. | |
436 | */ | |
437 | #define PSS_SHIFT 12 | |
438 | ||
1e883281 | 439 | #ifdef CONFIG_PROC_PAGE_MONITOR |
214e471f | 440 | struct mem_size_stats { |
493b0e9d | 441 | bool first; |
a6198797 MM |
442 | unsigned long resident; |
443 | unsigned long shared_clean; | |
444 | unsigned long shared_dirty; | |
445 | unsigned long private_clean; | |
446 | unsigned long private_dirty; | |
447 | unsigned long referenced; | |
b40d4f84 | 448 | unsigned long anonymous; |
cf8496ea | 449 | unsigned long lazyfree; |
4031a219 | 450 | unsigned long anonymous_thp; |
65c45377 | 451 | unsigned long shmem_thp; |
214e471f | 452 | unsigned long swap; |
25ee01a2 NH |
453 | unsigned long shared_hugetlb; |
454 | unsigned long private_hugetlb; | |
493b0e9d | 455 | unsigned long first_vma_start; |
a6198797 | 456 | u64 pss; |
493b0e9d | 457 | u64 pss_locked; |
8334b962 | 458 | u64 swap_pss; |
c261e7d9 | 459 | bool check_shmem_swap; |
a6198797 MM |
460 | }; |
461 | ||
c164e038 | 462 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
afd9883f | 463 | bool compound, bool young, bool dirty) |
c164e038 | 464 | { |
f4be6153 | 465 | int i, nr = compound ? 1 << compound_order(page) : 1; |
afd9883f | 466 | unsigned long size = nr * PAGE_SIZE; |
c164e038 | 467 | |
cf8496ea | 468 | if (PageAnon(page)) { |
c164e038 | 469 | mss->anonymous += size; |
cf8496ea SL |
470 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
471 | mss->lazyfree += size; | |
472 | } | |
c164e038 KS |
473 | |
474 | mss->resident += size; | |
475 | /* Accumulate the size in pages that have been accessed. */ | |
33c3fc71 | 476 | if (young || page_is_young(page) || PageReferenced(page)) |
c164e038 | 477 | mss->referenced += size; |
c164e038 | 478 | |
afd9883f KS |
479 | /* |
480 | * page_count(page) == 1 guarantees the page is mapped exactly once. | |
481 | * If any subpage of the compound page mapped with PTE it would elevate | |
482 | * page_count(). | |
483 | */ | |
484 | if (page_count(page) == 1) { | |
c164e038 KS |
485 | if (dirty || PageDirty(page)) |
486 | mss->private_dirty += size; | |
487 | else | |
488 | mss->private_clean += size; | |
489 | mss->pss += (u64)size << PSS_SHIFT; | |
afd9883f KS |
490 | return; |
491 | } | |
492 | ||
493 | for (i = 0; i < nr; i++, page++) { | |
494 | int mapcount = page_mapcount(page); | |
495 | ||
496 | if (mapcount >= 2) { | |
497 | if (dirty || PageDirty(page)) | |
498 | mss->shared_dirty += PAGE_SIZE; | |
499 | else | |
500 | mss->shared_clean += PAGE_SIZE; | |
501 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; | |
502 | } else { | |
503 | if (dirty || PageDirty(page)) | |
504 | mss->private_dirty += PAGE_SIZE; | |
505 | else | |
506 | mss->private_clean += PAGE_SIZE; | |
507 | mss->pss += PAGE_SIZE << PSS_SHIFT; | |
508 | } | |
c164e038 KS |
509 | } |
510 | } | |
ae11c4d9 | 511 | |
c261e7d9 | 512 | #ifdef CONFIG_SHMEM |
c261e7d9 VB |
513 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
514 | struct mm_walk *walk) | |
515 | { | |
516 | struct mem_size_stats *mss = walk->private; | |
517 | ||
48131e03 VB |
518 | mss->swap += shmem_partial_swap_usage( |
519 | walk->vma->vm_file->f_mapping, addr, end); | |
c261e7d9 VB |
520 | |
521 | return 0; | |
522 | } | |
c261e7d9 VB |
523 | #endif |
524 | ||
c164e038 KS |
525 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
526 | struct mm_walk *walk) | |
ae11c4d9 DH |
527 | { |
528 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 529 | struct vm_area_struct *vma = walk->vma; |
b1d4d9e0 | 530 | struct page *page = NULL; |
ae11c4d9 | 531 | |
c164e038 KS |
532 | if (pte_present(*pte)) { |
533 | page = vm_normal_page(vma, addr, *pte); | |
534 | } else if (is_swap_pte(*pte)) { | |
535 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
ae11c4d9 | 536 | |
8334b962 MK |
537 | if (!non_swap_entry(swpent)) { |
538 | int mapcount; | |
539 | ||
c164e038 | 540 | mss->swap += PAGE_SIZE; |
8334b962 MK |
541 | mapcount = swp_swapcount(swpent); |
542 | if (mapcount >= 2) { | |
543 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; | |
544 | ||
545 | do_div(pss_delta, mapcount); | |
546 | mss->swap_pss += pss_delta; | |
547 | } else { | |
548 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; | |
549 | } | |
550 | } else if (is_migration_entry(swpent)) | |
b1d4d9e0 | 551 | page = migration_entry_to_page(swpent); |
c261e7d9 VB |
552 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
553 | && pte_none(*pte))) { | |
48131e03 VB |
554 | page = find_get_entry(vma->vm_file->f_mapping, |
555 | linear_page_index(vma, addr)); | |
556 | if (!page) | |
557 | return; | |
558 | ||
559 | if (radix_tree_exceptional_entry(page)) | |
560 | mss->swap += PAGE_SIZE; | |
561 | else | |
09cbfeaf | 562 | put_page(page); |
48131e03 VB |
563 | |
564 | return; | |
b1d4d9e0 | 565 | } |
ae11c4d9 | 566 | |
ae11c4d9 DH |
567 | if (!page) |
568 | return; | |
afd9883f KS |
569 | |
570 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); | |
ae11c4d9 DH |
571 | } |
572 | ||
c164e038 KS |
573 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
574 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
575 | struct mm_walk *walk) | |
576 | { | |
577 | struct mem_size_stats *mss = walk->private; | |
14eb6fdd | 578 | struct vm_area_struct *vma = walk->vma; |
c164e038 KS |
579 | struct page *page; |
580 | ||
581 | /* FOLL_DUMP will return -EFAULT on huge zero page */ | |
582 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); | |
583 | if (IS_ERR_OR_NULL(page)) | |
584 | return; | |
65c45377 KS |
585 | if (PageAnon(page)) |
586 | mss->anonymous_thp += HPAGE_PMD_SIZE; | |
587 | else if (PageSwapBacked(page)) | |
588 | mss->shmem_thp += HPAGE_PMD_SIZE; | |
ca120cf6 DW |
589 | else if (is_zone_device_page(page)) |
590 | /* pass */; | |
65c45377 KS |
591 | else |
592 | VM_BUG_ON_PAGE(1, page); | |
afd9883f | 593 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
c164e038 KS |
594 | } |
595 | #else | |
596 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, | |
597 | struct mm_walk *walk) | |
598 | { | |
599 | } | |
600 | #endif | |
601 | ||
b3ae5acb | 602 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
2165009b | 603 | struct mm_walk *walk) |
e070ad49 | 604 | { |
14eb6fdd | 605 | struct vm_area_struct *vma = walk->vma; |
ae11c4d9 | 606 | pte_t *pte; |
705e87c0 | 607 | spinlock_t *ptl; |
e070ad49 | 608 | |
b6ec57f4 KS |
609 | ptl = pmd_trans_huge_lock(pmd, vma); |
610 | if (ptl) { | |
84c3fc4e ZY |
611 | if (pmd_present(*pmd)) |
612 | smaps_pmd_entry(pmd, addr, walk); | |
bf929152 | 613 | spin_unlock(ptl); |
025c5b24 | 614 | return 0; |
22e057c5 | 615 | } |
1a5a9906 AA |
616 | |
617 | if (pmd_trans_unstable(pmd)) | |
618 | return 0; | |
22e057c5 DH |
619 | /* |
620 | * The mmap_sem held all the way back in m_start() is what | |
621 | * keeps khugepaged out of here and from collapsing things | |
622 | * in here. | |
623 | */ | |
705e87c0 | 624 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
ae11c4d9 | 625 | for (; addr != end; pte++, addr += PAGE_SIZE) |
c164e038 | 626 | smaps_pte_entry(pte, addr, walk); |
705e87c0 HD |
627 | pte_unmap_unlock(pte - 1, ptl); |
628 | cond_resched(); | |
b3ae5acb | 629 | return 0; |
e070ad49 ML |
630 | } |
631 | ||
834f82e2 CG |
632 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
633 | { | |
634 | /* | |
635 | * Don't forget to update Documentation/ on changes. | |
636 | */ | |
637 | static const char mnemonics[BITS_PER_LONG][2] = { | |
638 | /* | |
639 | * In case if we meet a flag we don't know about. | |
640 | */ | |
641 | [0 ... (BITS_PER_LONG-1)] = "??", | |
642 | ||
643 | [ilog2(VM_READ)] = "rd", | |
644 | [ilog2(VM_WRITE)] = "wr", | |
645 | [ilog2(VM_EXEC)] = "ex", | |
646 | [ilog2(VM_SHARED)] = "sh", | |
647 | [ilog2(VM_MAYREAD)] = "mr", | |
648 | [ilog2(VM_MAYWRITE)] = "mw", | |
649 | [ilog2(VM_MAYEXEC)] = "me", | |
650 | [ilog2(VM_MAYSHARE)] = "ms", | |
651 | [ilog2(VM_GROWSDOWN)] = "gd", | |
652 | [ilog2(VM_PFNMAP)] = "pf", | |
653 | [ilog2(VM_DENYWRITE)] = "dw", | |
4aae7e43 QR |
654 | #ifdef CONFIG_X86_INTEL_MPX |
655 | [ilog2(VM_MPX)] = "mp", | |
656 | #endif | |
834f82e2 CG |
657 | [ilog2(VM_LOCKED)] = "lo", |
658 | [ilog2(VM_IO)] = "io", | |
659 | [ilog2(VM_SEQ_READ)] = "sr", | |
660 | [ilog2(VM_RAND_READ)] = "rr", | |
661 | [ilog2(VM_DONTCOPY)] = "dc", | |
662 | [ilog2(VM_DONTEXPAND)] = "de", | |
663 | [ilog2(VM_ACCOUNT)] = "ac", | |
664 | [ilog2(VM_NORESERVE)] = "nr", | |
665 | [ilog2(VM_HUGETLB)] = "ht", | |
834f82e2 | 666 | [ilog2(VM_ARCH_1)] = "ar", |
d2cd9ede | 667 | [ilog2(VM_WIPEONFORK)] = "wf", |
834f82e2 | 668 | [ilog2(VM_DONTDUMP)] = "dd", |
ec8e41ae NH |
669 | #ifdef CONFIG_MEM_SOFT_DIRTY |
670 | [ilog2(VM_SOFTDIRTY)] = "sd", | |
671 | #endif | |
834f82e2 CG |
672 | [ilog2(VM_MIXEDMAP)] = "mm", |
673 | [ilog2(VM_HUGEPAGE)] = "hg", | |
674 | [ilog2(VM_NOHUGEPAGE)] = "nh", | |
675 | [ilog2(VM_MERGEABLE)] = "mg", | |
16ba6f81 AA |
676 | [ilog2(VM_UFFD_MISSING)]= "um", |
677 | [ilog2(VM_UFFD_WP)] = "uw", | |
c1192f84 DH |
678 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
679 | /* These come out via ProtectionKey: */ | |
680 | [ilog2(VM_PKEY_BIT0)] = "", | |
681 | [ilog2(VM_PKEY_BIT1)] = "", | |
682 | [ilog2(VM_PKEY_BIT2)] = "", | |
683 | [ilog2(VM_PKEY_BIT3)] = "", | |
684 | #endif | |
834f82e2 CG |
685 | }; |
686 | size_t i; | |
687 | ||
688 | seq_puts(m, "VmFlags: "); | |
689 | for (i = 0; i < BITS_PER_LONG; i++) { | |
c1192f84 DH |
690 | if (!mnemonics[i][0]) |
691 | continue; | |
834f82e2 CG |
692 | if (vma->vm_flags & (1UL << i)) { |
693 | seq_printf(m, "%c%c ", | |
694 | mnemonics[i][0], mnemonics[i][1]); | |
695 | } | |
696 | } | |
697 | seq_putc(m, '\n'); | |
698 | } | |
699 | ||
25ee01a2 NH |
700 | #ifdef CONFIG_HUGETLB_PAGE |
701 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, | |
702 | unsigned long addr, unsigned long end, | |
703 | struct mm_walk *walk) | |
704 | { | |
705 | struct mem_size_stats *mss = walk->private; | |
706 | struct vm_area_struct *vma = walk->vma; | |
707 | struct page *page = NULL; | |
708 | ||
709 | if (pte_present(*pte)) { | |
710 | page = vm_normal_page(vma, addr, *pte); | |
711 | } else if (is_swap_pte(*pte)) { | |
712 | swp_entry_t swpent = pte_to_swp_entry(*pte); | |
713 | ||
714 | if (is_migration_entry(swpent)) | |
715 | page = migration_entry_to_page(swpent); | |
716 | } | |
717 | if (page) { | |
718 | int mapcount = page_mapcount(page); | |
719 | ||
720 | if (mapcount >= 2) | |
721 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); | |
722 | else | |
723 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); | |
724 | } | |
725 | return 0; | |
726 | } | |
727 | #endif /* HUGETLB_PAGE */ | |
728 | ||
c1192f84 DH |
729 | void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) |
730 | { | |
731 | } | |
732 | ||
b7643757 | 733 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
e070ad49 | 734 | { |
493b0e9d | 735 | struct proc_maps_private *priv = m->private; |
e070ad49 | 736 | struct vm_area_struct *vma = v; |
493b0e9d DC |
737 | struct mem_size_stats mss_stack; |
738 | struct mem_size_stats *mss; | |
2165009b DH |
739 | struct mm_walk smaps_walk = { |
740 | .pmd_entry = smaps_pte_range, | |
25ee01a2 NH |
741 | #ifdef CONFIG_HUGETLB_PAGE |
742 | .hugetlb_entry = smaps_hugetlb_range, | |
743 | #endif | |
2165009b | 744 | .mm = vma->vm_mm, |
2165009b | 745 | }; |
493b0e9d DC |
746 | int ret = 0; |
747 | bool rollup_mode; | |
748 | bool last_vma; | |
749 | ||
750 | if (priv->rollup) { | |
751 | rollup_mode = true; | |
752 | mss = priv->rollup; | |
753 | if (mss->first) { | |
754 | mss->first_vma_start = vma->vm_start; | |
755 | mss->first = false; | |
756 | } | |
757 | last_vma = !m_next_vma(priv, vma); | |
758 | } else { | |
759 | rollup_mode = false; | |
760 | memset(&mss_stack, 0, sizeof(mss_stack)); | |
761 | mss = &mss_stack; | |
762 | } | |
e070ad49 | 763 | |
493b0e9d | 764 | smaps_walk.private = mss; |
c261e7d9 VB |
765 | |
766 | #ifdef CONFIG_SHMEM | |
767 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { | |
6a15a370 VB |
768 | /* |
769 | * For shared or readonly shmem mappings we know that all | |
770 | * swapped out pages belong to the shmem object, and we can | |
771 | * obtain the swap value much more efficiently. For private | |
772 | * writable mappings, we might have COW pages that are | |
773 | * not affected by the parent swapped out pages of the shmem | |
774 | * object, so we have to distinguish them during the page walk. | |
775 | * Unless we know that the shmem object (or the part mapped by | |
776 | * our VMA) has no swapped out pages at all. | |
777 | */ | |
778 | unsigned long shmem_swapped = shmem_swap_usage(vma); | |
779 | ||
780 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || | |
781 | !(vma->vm_flags & VM_WRITE)) { | |
493b0e9d | 782 | mss->swap = shmem_swapped; |
6a15a370 | 783 | } else { |
493b0e9d | 784 | mss->check_shmem_swap = true; |
6a15a370 VB |
785 | smaps_walk.pte_hole = smaps_pte_hole; |
786 | } | |
c261e7d9 VB |
787 | } |
788 | #endif | |
789 | ||
d82ef020 | 790 | /* mmap_sem is held in m_start */ |
14eb6fdd | 791 | walk_page_vma(vma, &smaps_walk); |
493b0e9d DC |
792 | if (vma->vm_flags & VM_LOCKED) |
793 | mss->pss_locked += mss->pss; | |
794 | ||
795 | if (!rollup_mode) { | |
796 | show_map_vma(m, vma, is_pid); | |
797 | } else if (last_vma) { | |
798 | show_vma_header_prefix( | |
799 | m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0); | |
800 | seq_pad(m, ' '); | |
801 | seq_puts(m, "[rollup]\n"); | |
802 | } else { | |
803 | ret = SEQ_SKIP; | |
804 | } | |
4752c369 | 805 | |
493b0e9d DC |
806 | if (!rollup_mode) |
807 | seq_printf(m, | |
808 | "Size: %8lu kB\n" | |
809 | "KernelPageSize: %8lu kB\n" | |
810 | "MMUPageSize: %8lu kB\n", | |
811 | (vma->vm_end - vma->vm_start) >> 10, | |
812 | vma_kernel_pagesize(vma) >> 10, | |
813 | vma_mmu_pagesize(vma) >> 10); | |
814 | ||
815 | ||
816 | if (!rollup_mode || last_vma) | |
817 | seq_printf(m, | |
818 | "Rss: %8lu kB\n" | |
819 | "Pss: %8lu kB\n" | |
820 | "Shared_Clean: %8lu kB\n" | |
821 | "Shared_Dirty: %8lu kB\n" | |
822 | "Private_Clean: %8lu kB\n" | |
823 | "Private_Dirty: %8lu kB\n" | |
824 | "Referenced: %8lu kB\n" | |
825 | "Anonymous: %8lu kB\n" | |
826 | "LazyFree: %8lu kB\n" | |
827 | "AnonHugePages: %8lu kB\n" | |
828 | "ShmemPmdMapped: %8lu kB\n" | |
829 | "Shared_Hugetlb: %8lu kB\n" | |
830 | "Private_Hugetlb: %7lu kB\n" | |
831 | "Swap: %8lu kB\n" | |
832 | "SwapPss: %8lu kB\n" | |
833 | "Locked: %8lu kB\n", | |
834 | mss->resident >> 10, | |
835 | (unsigned long)(mss->pss >> (10 + PSS_SHIFT)), | |
836 | mss->shared_clean >> 10, | |
837 | mss->shared_dirty >> 10, | |
838 | mss->private_clean >> 10, | |
839 | mss->private_dirty >> 10, | |
840 | mss->referenced >> 10, | |
841 | mss->anonymous >> 10, | |
842 | mss->lazyfree >> 10, | |
843 | mss->anonymous_thp >> 10, | |
844 | mss->shmem_thp >> 10, | |
845 | mss->shared_hugetlb >> 10, | |
846 | mss->private_hugetlb >> 10, | |
847 | mss->swap >> 10, | |
848 | (unsigned long)(mss->swap_pss >> (10 + PSS_SHIFT)), | |
849 | (unsigned long)(mss->pss >> (10 + PSS_SHIFT))); | |
850 | ||
851 | if (!rollup_mode) { | |
852 | arch_show_smap(m, vma); | |
853 | show_smap_vma_flags(m, vma); | |
854 | } | |
b8c20a9b | 855 | m_cache_vma(m, vma); |
493b0e9d | 856 | return ret; |
e070ad49 ML |
857 | } |
858 | ||
b7643757 SP |
859 | static int show_pid_smap(struct seq_file *m, void *v) |
860 | { | |
861 | return show_smap(m, v, 1); | |
862 | } | |
863 | ||
864 | static int show_tid_smap(struct seq_file *m, void *v) | |
865 | { | |
866 | return show_smap(m, v, 0); | |
867 | } | |
868 | ||
03a44825 | 869 | static const struct seq_operations proc_pid_smaps_op = { |
a6198797 MM |
870 | .start = m_start, |
871 | .next = m_next, | |
872 | .stop = m_stop, | |
b7643757 SP |
873 | .show = show_pid_smap |
874 | }; | |
875 | ||
876 | static const struct seq_operations proc_tid_smaps_op = { | |
877 | .start = m_start, | |
878 | .next = m_next, | |
879 | .stop = m_stop, | |
880 | .show = show_tid_smap | |
a6198797 MM |
881 | }; |
882 | ||
b7643757 | 883 | static int pid_smaps_open(struct inode *inode, struct file *file) |
a6198797 MM |
884 | { |
885 | return do_maps_open(inode, file, &proc_pid_smaps_op); | |
886 | } | |
887 | ||
493b0e9d DC |
888 | static int pid_smaps_rollup_open(struct inode *inode, struct file *file) |
889 | { | |
890 | struct seq_file *seq; | |
891 | struct proc_maps_private *priv; | |
892 | int ret = do_maps_open(inode, file, &proc_pid_smaps_op); | |
893 | ||
894 | if (ret < 0) | |
895 | return ret; | |
896 | seq = file->private_data; | |
897 | priv = seq->private; | |
898 | priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL); | |
899 | if (!priv->rollup) { | |
900 | proc_map_release(inode, file); | |
901 | return -ENOMEM; | |
902 | } | |
903 | priv->rollup->first = true; | |
904 | return 0; | |
905 | } | |
906 | ||
b7643757 SP |
907 | static int tid_smaps_open(struct inode *inode, struct file *file) |
908 | { | |
909 | return do_maps_open(inode, file, &proc_tid_smaps_op); | |
910 | } | |
911 | ||
912 | const struct file_operations proc_pid_smaps_operations = { | |
913 | .open = pid_smaps_open, | |
914 | .read = seq_read, | |
915 | .llseek = seq_lseek, | |
29a40ace | 916 | .release = proc_map_release, |
b7643757 SP |
917 | }; |
918 | ||
493b0e9d DC |
919 | const struct file_operations proc_pid_smaps_rollup_operations = { |
920 | .open = pid_smaps_rollup_open, | |
921 | .read = seq_read, | |
922 | .llseek = seq_lseek, | |
923 | .release = proc_map_release, | |
924 | }; | |
925 | ||
b7643757 SP |
926 | const struct file_operations proc_tid_smaps_operations = { |
927 | .open = tid_smaps_open, | |
a6198797 MM |
928 | .read = seq_read, |
929 | .llseek = seq_lseek, | |
29a40ace | 930 | .release = proc_map_release, |
a6198797 MM |
931 | }; |
932 | ||
040fa020 PE |
933 | enum clear_refs_types { |
934 | CLEAR_REFS_ALL = 1, | |
935 | CLEAR_REFS_ANON, | |
936 | CLEAR_REFS_MAPPED, | |
0f8975ec | 937 | CLEAR_REFS_SOFT_DIRTY, |
695f0559 | 938 | CLEAR_REFS_MM_HIWATER_RSS, |
040fa020 PE |
939 | CLEAR_REFS_LAST, |
940 | }; | |
941 | ||
af9de7eb | 942 | struct clear_refs_private { |
0f8975ec | 943 | enum clear_refs_types type; |
af9de7eb PE |
944 | }; |
945 | ||
7d5b3bfa | 946 | #ifdef CONFIG_MEM_SOFT_DIRTY |
0f8975ec PE |
947 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
948 | unsigned long addr, pte_t *pte) | |
949 | { | |
0f8975ec PE |
950 | /* |
951 | * The soft-dirty tracker uses #PF-s to catch writes | |
952 | * to pages, so write-protect the pte as well. See the | |
953 | * Documentation/vm/soft-dirty.txt for full description | |
954 | * of how soft-dirty works. | |
955 | */ | |
956 | pte_t ptent = *pte; | |
179ef71c CG |
957 | |
958 | if (pte_present(ptent)) { | |
326c2597 | 959 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
179ef71c | 960 | ptent = pte_wrprotect(ptent); |
a7b76174 | 961 | ptent = pte_clear_soft_dirty(ptent); |
326c2597 | 962 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
179ef71c CG |
963 | } else if (is_swap_pte(ptent)) { |
964 | ptent = pte_swp_clear_soft_dirty(ptent); | |
326c2597 | 965 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
179ef71c | 966 | } |
0f8975ec | 967 | } |
5d3875a0 LD |
968 | #else |
969 | static inline void clear_soft_dirty(struct vm_area_struct *vma, | |
970 | unsigned long addr, pte_t *pte) | |
971 | { | |
972 | } | |
973 | #endif | |
0f8975ec | 974 | |
5d3875a0 | 975 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
7d5b3bfa KS |
976 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
977 | unsigned long addr, pmd_t *pmdp) | |
978 | { | |
5b7abeae KS |
979 | pmd_t pmd = *pmdp; |
980 | ||
ab6e3d09 NH |
981 | if (pmd_present(pmd)) { |
982 | /* See comment in change_huge_pmd() */ | |
983 | pmdp_invalidate(vma, addr, pmdp); | |
984 | if (pmd_dirty(*pmdp)) | |
985 | pmd = pmd_mkdirty(pmd); | |
986 | if (pmd_young(*pmdp)) | |
987 | pmd = pmd_mkyoung(pmd); | |
988 | ||
989 | pmd = pmd_wrprotect(pmd); | |
990 | pmd = pmd_clear_soft_dirty(pmd); | |
991 | ||
992 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
993 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { | |
994 | pmd = pmd_swp_clear_soft_dirty(pmd); | |
995 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); | |
996 | } | |
7d5b3bfa | 997 | } |
7d5b3bfa | 998 | #else |
7d5b3bfa KS |
999 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
1000 | unsigned long addr, pmd_t *pmdp) | |
1001 | { | |
1002 | } | |
1003 | #endif | |
1004 | ||
a6198797 | 1005 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
2165009b | 1006 | unsigned long end, struct mm_walk *walk) |
a6198797 | 1007 | { |
af9de7eb | 1008 | struct clear_refs_private *cp = walk->private; |
5c64f52a | 1009 | struct vm_area_struct *vma = walk->vma; |
a6198797 MM |
1010 | pte_t *pte, ptent; |
1011 | spinlock_t *ptl; | |
1012 | struct page *page; | |
1013 | ||
b6ec57f4 KS |
1014 | ptl = pmd_trans_huge_lock(pmd, vma); |
1015 | if (ptl) { | |
7d5b3bfa KS |
1016 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1017 | clear_soft_dirty_pmd(vma, addr, pmd); | |
1018 | goto out; | |
1019 | } | |
1020 | ||
84c3fc4e ZY |
1021 | if (!pmd_present(*pmd)) |
1022 | goto out; | |
1023 | ||
7d5b3bfa KS |
1024 | page = pmd_page(*pmd); |
1025 | ||
1026 | /* Clear accessed and referenced bits. */ | |
1027 | pmdp_test_and_clear_young(vma, addr, pmd); | |
33c3fc71 | 1028 | test_and_clear_page_young(page); |
7d5b3bfa KS |
1029 | ClearPageReferenced(page); |
1030 | out: | |
1031 | spin_unlock(ptl); | |
1032 | return 0; | |
1033 | } | |
1034 | ||
1a5a9906 AA |
1035 | if (pmd_trans_unstable(pmd)) |
1036 | return 0; | |
03319327 | 1037 | |
a6198797 MM |
1038 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
1039 | for (; addr != end; pte++, addr += PAGE_SIZE) { | |
1040 | ptent = *pte; | |
a6198797 | 1041 | |
0f8975ec PE |
1042 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
1043 | clear_soft_dirty(vma, addr, pte); | |
1044 | continue; | |
1045 | } | |
1046 | ||
179ef71c CG |
1047 | if (!pte_present(ptent)) |
1048 | continue; | |
1049 | ||
a6198797 MM |
1050 | page = vm_normal_page(vma, addr, ptent); |
1051 | if (!page) | |
1052 | continue; | |
1053 | ||
1054 | /* Clear accessed and referenced bits. */ | |
1055 | ptep_test_and_clear_young(vma, addr, pte); | |
33c3fc71 | 1056 | test_and_clear_page_young(page); |
a6198797 MM |
1057 | ClearPageReferenced(page); |
1058 | } | |
1059 | pte_unmap_unlock(pte - 1, ptl); | |
1060 | cond_resched(); | |
1061 | return 0; | |
1062 | } | |
1063 | ||
5c64f52a NH |
1064 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
1065 | struct mm_walk *walk) | |
1066 | { | |
1067 | struct clear_refs_private *cp = walk->private; | |
1068 | struct vm_area_struct *vma = walk->vma; | |
1069 | ||
48684a65 NH |
1070 | if (vma->vm_flags & VM_PFNMAP) |
1071 | return 1; | |
1072 | ||
5c64f52a NH |
1073 | /* |
1074 | * Writing 1 to /proc/pid/clear_refs affects all pages. | |
1075 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. | |
1076 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. | |
1077 | * Writing 4 to /proc/pid/clear_refs affects all pages. | |
1078 | */ | |
1079 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) | |
1080 | return 1; | |
1081 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) | |
1082 | return 1; | |
1083 | return 0; | |
1084 | } | |
1085 | ||
f248dcb3 MM |
1086 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
1087 | size_t count, loff_t *ppos) | |
b813e931 | 1088 | { |
f248dcb3 | 1089 | struct task_struct *task; |
fb92a4b0 | 1090 | char buffer[PROC_NUMBUF]; |
f248dcb3 | 1091 | struct mm_struct *mm; |
b813e931 | 1092 | struct vm_area_struct *vma; |
040fa020 | 1093 | enum clear_refs_types type; |
b3a81d08 | 1094 | struct mmu_gather tlb; |
040fa020 | 1095 | int itype; |
0a8cb8e3 | 1096 | int rv; |
b813e931 | 1097 | |
f248dcb3 MM |
1098 | memset(buffer, 0, sizeof(buffer)); |
1099 | if (count > sizeof(buffer) - 1) | |
1100 | count = sizeof(buffer) - 1; | |
1101 | if (copy_from_user(buffer, buf, count)) | |
1102 | return -EFAULT; | |
040fa020 | 1103 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
0a8cb8e3 AD |
1104 | if (rv < 0) |
1105 | return rv; | |
040fa020 PE |
1106 | type = (enum clear_refs_types)itype; |
1107 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) | |
f248dcb3 | 1108 | return -EINVAL; |
541c237c | 1109 | |
496ad9aa | 1110 | task = get_proc_task(file_inode(file)); |
f248dcb3 MM |
1111 | if (!task) |
1112 | return -ESRCH; | |
1113 | mm = get_task_mm(task); | |
1114 | if (mm) { | |
af9de7eb | 1115 | struct clear_refs_private cp = { |
0f8975ec | 1116 | .type = type, |
af9de7eb | 1117 | }; |
20cbc972 AM |
1118 | struct mm_walk clear_refs_walk = { |
1119 | .pmd_entry = clear_refs_pte_range, | |
5c64f52a | 1120 | .test_walk = clear_refs_test_walk, |
20cbc972 | 1121 | .mm = mm, |
af9de7eb | 1122 | .private = &cp, |
20cbc972 | 1123 | }; |
695f0559 PC |
1124 | |
1125 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { | |
4e80153a MH |
1126 | if (down_write_killable(&mm->mmap_sem)) { |
1127 | count = -EINTR; | |
1128 | goto out_mm; | |
1129 | } | |
1130 | ||
695f0559 PC |
1131 | /* |
1132 | * Writing 5 to /proc/pid/clear_refs resets the peak | |
1133 | * resident set size to this mm's current rss value. | |
1134 | */ | |
695f0559 PC |
1135 | reset_mm_hiwater_rss(mm); |
1136 | up_write(&mm->mmap_sem); | |
1137 | goto out_mm; | |
1138 | } | |
1139 | ||
f248dcb3 | 1140 | down_read(&mm->mmap_sem); |
b3a81d08 | 1141 | tlb_gather_mmu(&tlb, mm, 0, -1); |
64e45507 PF |
1142 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
1143 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1144 | if (!(vma->vm_flags & VM_SOFTDIRTY)) | |
1145 | continue; | |
1146 | up_read(&mm->mmap_sem); | |
4e80153a MH |
1147 | if (down_write_killable(&mm->mmap_sem)) { |
1148 | count = -EINTR; | |
1149 | goto out_mm; | |
1150 | } | |
64e45507 PF |
1151 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
1152 | vma->vm_flags &= ~VM_SOFTDIRTY; | |
1153 | vma_set_page_prot(vma); | |
1154 | } | |
1155 | downgrade_write(&mm->mmap_sem); | |
1156 | break; | |
1157 | } | |
0f8975ec | 1158 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
64e45507 | 1159 | } |
0f30206b | 1160 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
0f8975ec PE |
1161 | if (type == CLEAR_REFS_SOFT_DIRTY) |
1162 | mmu_notifier_invalidate_range_end(mm, 0, -1); | |
b3a81d08 | 1163 | tlb_finish_mmu(&tlb, 0, -1); |
f248dcb3 | 1164 | up_read(&mm->mmap_sem); |
695f0559 | 1165 | out_mm: |
f248dcb3 MM |
1166 | mmput(mm); |
1167 | } | |
1168 | put_task_struct(task); | |
fb92a4b0 VL |
1169 | |
1170 | return count; | |
b813e931 DR |
1171 | } |
1172 | ||
f248dcb3 MM |
1173 | const struct file_operations proc_clear_refs_operations = { |
1174 | .write = clear_refs_write, | |
6038f373 | 1175 | .llseek = noop_llseek, |
f248dcb3 MM |
1176 | }; |
1177 | ||
092b50ba NH |
1178 | typedef struct { |
1179 | u64 pme; | |
1180 | } pagemap_entry_t; | |
1181 | ||
85863e47 | 1182 | struct pagemapread { |
8c829622 | 1183 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
092b50ba | 1184 | pagemap_entry_t *buffer; |
1c90308e | 1185 | bool show_pfn; |
85863e47 MM |
1186 | }; |
1187 | ||
5aaabe83 NH |
1188 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
1189 | #define PAGEMAP_WALK_MASK (PMD_MASK) | |
1190 | ||
deb94544 KK |
1191 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
1192 | #define PM_PFRAME_BITS 55 | |
1193 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) | |
1194 | #define PM_SOFT_DIRTY BIT_ULL(55) | |
77bb499b | 1195 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
deb94544 KK |
1196 | #define PM_FILE BIT_ULL(61) |
1197 | #define PM_SWAP BIT_ULL(62) | |
1198 | #define PM_PRESENT BIT_ULL(63) | |
1199 | ||
85863e47 MM |
1200 | #define PM_END_OF_BUFFER 1 |
1201 | ||
deb94544 | 1202 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
092b50ba | 1203 | { |
deb94544 | 1204 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
092b50ba NH |
1205 | } |
1206 | ||
1207 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, | |
85863e47 MM |
1208 | struct pagemapread *pm) |
1209 | { | |
092b50ba | 1210 | pm->buffer[pm->pos++] = *pme; |
d82ef020 | 1211 | if (pm->pos >= pm->len) |
aae8679b | 1212 | return PM_END_OF_BUFFER; |
85863e47 MM |
1213 | return 0; |
1214 | } | |
1215 | ||
1216 | static int pagemap_pte_hole(unsigned long start, unsigned long end, | |
2165009b | 1217 | struct mm_walk *walk) |
85863e47 | 1218 | { |
2165009b | 1219 | struct pagemapread *pm = walk->private; |
68b5a652 | 1220 | unsigned long addr = start; |
85863e47 | 1221 | int err = 0; |
092b50ba | 1222 | |
68b5a652 PF |
1223 | while (addr < end) { |
1224 | struct vm_area_struct *vma = find_vma(walk->mm, addr); | |
deb94544 | 1225 | pagemap_entry_t pme = make_pme(0, 0); |
87e6d49a PF |
1226 | /* End of address space hole, which we mark as non-present. */ |
1227 | unsigned long hole_end; | |
68b5a652 | 1228 | |
87e6d49a PF |
1229 | if (vma) |
1230 | hole_end = min(end, vma->vm_start); | |
1231 | else | |
1232 | hole_end = end; | |
1233 | ||
1234 | for (; addr < hole_end; addr += PAGE_SIZE) { | |
1235 | err = add_to_pagemap(addr, &pme, pm); | |
1236 | if (err) | |
1237 | goto out; | |
68b5a652 PF |
1238 | } |
1239 | ||
87e6d49a PF |
1240 | if (!vma) |
1241 | break; | |
1242 | ||
1243 | /* Addresses in the VMA. */ | |
1244 | if (vma->vm_flags & VM_SOFTDIRTY) | |
deb94544 | 1245 | pme = make_pme(0, PM_SOFT_DIRTY); |
87e6d49a | 1246 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
68b5a652 PF |
1247 | err = add_to_pagemap(addr, &pme, pm); |
1248 | if (err) | |
1249 | goto out; | |
1250 | } | |
85863e47 | 1251 | } |
68b5a652 | 1252 | out: |
85863e47 MM |
1253 | return err; |
1254 | } | |
1255 | ||
deb94544 | 1256 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
052fb0d6 | 1257 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
85863e47 | 1258 | { |
deb94544 | 1259 | u64 frame = 0, flags = 0; |
052fb0d6 | 1260 | struct page *page = NULL; |
85863e47 | 1261 | |
052fb0d6 | 1262 | if (pte_present(pte)) { |
1c90308e KK |
1263 | if (pm->show_pfn) |
1264 | frame = pte_pfn(pte); | |
deb94544 | 1265 | flags |= PM_PRESENT; |
052fb0d6 | 1266 | page = vm_normal_page(vma, addr, pte); |
e9cdd6e7 | 1267 | if (pte_soft_dirty(pte)) |
deb94544 | 1268 | flags |= PM_SOFT_DIRTY; |
052fb0d6 | 1269 | } else if (is_swap_pte(pte)) { |
179ef71c CG |
1270 | swp_entry_t entry; |
1271 | if (pte_swp_soft_dirty(pte)) | |
deb94544 | 1272 | flags |= PM_SOFT_DIRTY; |
179ef71c | 1273 | entry = pte_to_swp_entry(pte); |
052fb0d6 KK |
1274 | frame = swp_type(entry) | |
1275 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
deb94544 | 1276 | flags |= PM_SWAP; |
052fb0d6 KK |
1277 | if (is_migration_entry(entry)) |
1278 | page = migration_entry_to_page(entry); | |
052fb0d6 KK |
1279 | } |
1280 | ||
1281 | if (page && !PageAnon(page)) | |
1282 | flags |= PM_FILE; | |
77bb499b KK |
1283 | if (page && page_mapcount(page) == 1) |
1284 | flags |= PM_MMAP_EXCLUSIVE; | |
deb94544 KK |
1285 | if (vma->vm_flags & VM_SOFTDIRTY) |
1286 | flags |= PM_SOFT_DIRTY; | |
052fb0d6 | 1287 | |
deb94544 | 1288 | return make_pme(frame, flags); |
bcf8039e DH |
1289 | } |
1290 | ||
356515e7 | 1291 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
2165009b | 1292 | struct mm_walk *walk) |
85863e47 | 1293 | { |
f995ece2 | 1294 | struct vm_area_struct *vma = walk->vma; |
2165009b | 1295 | struct pagemapread *pm = walk->private; |
bf929152 | 1296 | spinlock_t *ptl; |
05fbf357 | 1297 | pte_t *pte, *orig_pte; |
85863e47 MM |
1298 | int err = 0; |
1299 | ||
356515e7 | 1300 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1301 | ptl = pmd_trans_huge_lock(pmdp, vma); |
1302 | if (ptl) { | |
356515e7 KK |
1303 | u64 flags = 0, frame = 0; |
1304 | pmd_t pmd = *pmdp; | |
84c3fc4e | 1305 | struct page *page = NULL; |
0f8975ec | 1306 | |
356515e7 | 1307 | if ((vma->vm_flags & VM_SOFTDIRTY) || pmd_soft_dirty(pmd)) |
deb94544 | 1308 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1309 | |
356515e7 | 1310 | if (pmd_present(pmd)) { |
84c3fc4e | 1311 | page = pmd_page(pmd); |
77bb499b | 1312 | |
356515e7 | 1313 | flags |= PM_PRESENT; |
1c90308e KK |
1314 | if (pm->show_pfn) |
1315 | frame = pmd_pfn(pmd) + | |
1316 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); | |
356515e7 | 1317 | } |
84c3fc4e ZY |
1318 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
1319 | else if (is_swap_pmd(pmd)) { | |
1320 | swp_entry_t entry = pmd_to_swp_entry(pmd); | |
1321 | ||
1322 | frame = swp_type(entry) | | |
1323 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); | |
1324 | flags |= PM_SWAP; | |
1325 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); | |
1326 | page = migration_entry_to_page(entry); | |
1327 | } | |
1328 | #endif | |
1329 | ||
1330 | if (page && page_mapcount(page) == 1) | |
1331 | flags |= PM_MMAP_EXCLUSIVE; | |
356515e7 | 1332 | |
025c5b24 | 1333 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 | 1334 | pagemap_entry_t pme = make_pme(frame, flags); |
025c5b24 | 1335 | |
092b50ba | 1336 | err = add_to_pagemap(addr, &pme, pm); |
025c5b24 NH |
1337 | if (err) |
1338 | break; | |
1c90308e | 1339 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1340 | frame++; |
5aaabe83 | 1341 | } |
bf929152 | 1342 | spin_unlock(ptl); |
025c5b24 | 1343 | return err; |
5aaabe83 NH |
1344 | } |
1345 | ||
356515e7 | 1346 | if (pmd_trans_unstable(pmdp)) |
45f83cef | 1347 | return 0; |
356515e7 | 1348 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
81d0fa62 | 1349 | |
f995ece2 NH |
1350 | /* |
1351 | * We can assume that @vma always points to a valid one and @end never | |
1352 | * goes beyond vma->vm_end. | |
1353 | */ | |
356515e7 | 1354 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
f995ece2 NH |
1355 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
1356 | pagemap_entry_t pme; | |
05fbf357 | 1357 | |
deb94544 | 1358 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
f995ece2 | 1359 | err = add_to_pagemap(addr, &pme, pm); |
05fbf357 | 1360 | if (err) |
81d0fa62 | 1361 | break; |
85863e47 | 1362 | } |
f995ece2 | 1363 | pte_unmap_unlock(orig_pte, ptl); |
85863e47 MM |
1364 | |
1365 | cond_resched(); | |
1366 | ||
1367 | return err; | |
1368 | } | |
1369 | ||
1a5cb814 | 1370 | #ifdef CONFIG_HUGETLB_PAGE |
116354d1 | 1371 | /* This function walks within one hugetlb entry in the single call */ |
356515e7 | 1372 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
116354d1 NH |
1373 | unsigned long addr, unsigned long end, |
1374 | struct mm_walk *walk) | |
5dc37642 | 1375 | { |
5dc37642 | 1376 | struct pagemapread *pm = walk->private; |
f995ece2 | 1377 | struct vm_area_struct *vma = walk->vma; |
356515e7 | 1378 | u64 flags = 0, frame = 0; |
5dc37642 | 1379 | int err = 0; |
356515e7 | 1380 | pte_t pte; |
5dc37642 | 1381 | |
f995ece2 | 1382 | if (vma->vm_flags & VM_SOFTDIRTY) |
deb94544 | 1383 | flags |= PM_SOFT_DIRTY; |
d9104d1c | 1384 | |
356515e7 KK |
1385 | pte = huge_ptep_get(ptep); |
1386 | if (pte_present(pte)) { | |
1387 | struct page *page = pte_page(pte); | |
1388 | ||
1389 | if (!PageAnon(page)) | |
1390 | flags |= PM_FILE; | |
1391 | ||
77bb499b KK |
1392 | if (page_mapcount(page) == 1) |
1393 | flags |= PM_MMAP_EXCLUSIVE; | |
1394 | ||
356515e7 | 1395 | flags |= PM_PRESENT; |
1c90308e KK |
1396 | if (pm->show_pfn) |
1397 | frame = pte_pfn(pte) + | |
1398 | ((addr & ~hmask) >> PAGE_SHIFT); | |
356515e7 KK |
1399 | } |
1400 | ||
5dc37642 | 1401 | for (; addr != end; addr += PAGE_SIZE) { |
356515e7 KK |
1402 | pagemap_entry_t pme = make_pme(frame, flags); |
1403 | ||
092b50ba | 1404 | err = add_to_pagemap(addr, &pme, pm); |
5dc37642 NH |
1405 | if (err) |
1406 | return err; | |
1c90308e | 1407 | if (pm->show_pfn && (flags & PM_PRESENT)) |
356515e7 | 1408 | frame++; |
5dc37642 NH |
1409 | } |
1410 | ||
1411 | cond_resched(); | |
1412 | ||
1413 | return err; | |
1414 | } | |
1a5cb814 | 1415 | #endif /* HUGETLB_PAGE */ |
5dc37642 | 1416 | |
85863e47 MM |
1417 | /* |
1418 | * /proc/pid/pagemap - an array mapping virtual pages to pfns | |
1419 | * | |
f16278c6 HR |
1420 | * For each page in the address space, this file contains one 64-bit entry |
1421 | * consisting of the following: | |
1422 | * | |
052fb0d6 | 1423 | * Bits 0-54 page frame number (PFN) if present |
f16278c6 | 1424 | * Bits 0-4 swap type if swapped |
052fb0d6 | 1425 | * Bits 5-54 swap offset if swapped |
deb94544 | 1426 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
77bb499b KK |
1427 | * Bit 56 page exclusively mapped |
1428 | * Bits 57-60 zero | |
052fb0d6 | 1429 | * Bit 61 page is file-page or shared-anon |
f16278c6 HR |
1430 | * Bit 62 page swapped |
1431 | * Bit 63 page present | |
1432 | * | |
1433 | * If the page is not present but in swap, then the PFN contains an | |
1434 | * encoding of the swap file number and the page's offset into the | |
1435 | * swap. Unmapped pages return a null PFN. This allows determining | |
85863e47 MM |
1436 | * precisely which pages are mapped (or in swap) and comparing mapped |
1437 | * pages between processes. | |
1438 | * | |
1439 | * Efficient users of this interface will use /proc/pid/maps to | |
1440 | * determine which areas of memory are actually mapped and llseek to | |
1441 | * skip over unmapped regions. | |
1442 | */ | |
1443 | static ssize_t pagemap_read(struct file *file, char __user *buf, | |
1444 | size_t count, loff_t *ppos) | |
1445 | { | |
a06db751 | 1446 | struct mm_struct *mm = file->private_data; |
85863e47 | 1447 | struct pagemapread pm; |
ee1e6ab6 | 1448 | struct mm_walk pagemap_walk = {}; |
5d7e0d2b AM |
1449 | unsigned long src; |
1450 | unsigned long svpfn; | |
1451 | unsigned long start_vaddr; | |
1452 | unsigned long end_vaddr; | |
a06db751 | 1453 | int ret = 0, copied = 0; |
85863e47 | 1454 | |
388f7934 | 1455 | if (!mm || !mmget_not_zero(mm)) |
85863e47 MM |
1456 | goto out; |
1457 | ||
85863e47 MM |
1458 | ret = -EINVAL; |
1459 | /* file position must be aligned */ | |
aae8679b | 1460 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
a06db751 | 1461 | goto out_mm; |
85863e47 MM |
1462 | |
1463 | ret = 0; | |
08161786 | 1464 | if (!count) |
a06db751 | 1465 | goto out_mm; |
08161786 | 1466 | |
1c90308e KK |
1467 | /* do not disclose physical addresses: attack vector */ |
1468 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); | |
1469 | ||
8c829622 | 1470 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
1471 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_TEMPORARY); | |
5d7e0d2b | 1472 | ret = -ENOMEM; |
d82ef020 | 1473 | if (!pm.buffer) |
a06db751 | 1474 | goto out_mm; |
85863e47 | 1475 | |
356515e7 | 1476 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
5d7e0d2b | 1477 | pagemap_walk.pte_hole = pagemap_pte_hole; |
1a5cb814 | 1478 | #ifdef CONFIG_HUGETLB_PAGE |
5dc37642 | 1479 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
1a5cb814 | 1480 | #endif |
5d7e0d2b AM |
1481 | pagemap_walk.mm = mm; |
1482 | pagemap_walk.private = ± | |
1483 | ||
1484 | src = *ppos; | |
1485 | svpfn = src / PM_ENTRY_BYTES; | |
1486 | start_vaddr = svpfn << PAGE_SHIFT; | |
a06db751 | 1487 | end_vaddr = mm->task_size; |
5d7e0d2b AM |
1488 | |
1489 | /* watch out for wraparound */ | |
a06db751 | 1490 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
5d7e0d2b AM |
1491 | start_vaddr = end_vaddr; |
1492 | ||
1493 | /* | |
1494 | * The odds are that this will stop walking way | |
1495 | * before end_vaddr, because the length of the | |
1496 | * user buffer is tracked in "pm", and the walk | |
1497 | * will stop when we hit the end of the buffer. | |
1498 | */ | |
d82ef020 KH |
1499 | ret = 0; |
1500 | while (count && (start_vaddr < end_vaddr)) { | |
1501 | int len; | |
1502 | unsigned long end; | |
1503 | ||
1504 | pm.pos = 0; | |
ea251c1d | 1505 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
d82ef020 KH |
1506 | /* overflow ? */ |
1507 | if (end < start_vaddr || end > end_vaddr) | |
1508 | end = end_vaddr; | |
1509 | down_read(&mm->mmap_sem); | |
1510 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); | |
1511 | up_read(&mm->mmap_sem); | |
1512 | start_vaddr = end; | |
1513 | ||
1514 | len = min(count, PM_ENTRY_BYTES * pm.pos); | |
309361e0 | 1515 | if (copy_to_user(buf, pm.buffer, len)) { |
d82ef020 | 1516 | ret = -EFAULT; |
a06db751 | 1517 | goto out_free; |
d82ef020 KH |
1518 | } |
1519 | copied += len; | |
1520 | buf += len; | |
1521 | count -= len; | |
85863e47 | 1522 | } |
d82ef020 KH |
1523 | *ppos += copied; |
1524 | if (!ret || ret == PM_END_OF_BUFFER) | |
1525 | ret = copied; | |
1526 | ||
98bc93e5 KM |
1527 | out_free: |
1528 | kfree(pm.buffer); | |
a06db751 KK |
1529 | out_mm: |
1530 | mmput(mm); | |
85863e47 MM |
1531 | out: |
1532 | return ret; | |
1533 | } | |
1534 | ||
541c237c PE |
1535 | static int pagemap_open(struct inode *inode, struct file *file) |
1536 | { | |
a06db751 KK |
1537 | struct mm_struct *mm; |
1538 | ||
a06db751 KK |
1539 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
1540 | if (IS_ERR(mm)) | |
1541 | return PTR_ERR(mm); | |
1542 | file->private_data = mm; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int pagemap_release(struct inode *inode, struct file *file) | |
1547 | { | |
1548 | struct mm_struct *mm = file->private_data; | |
1549 | ||
1550 | if (mm) | |
1551 | mmdrop(mm); | |
541c237c PE |
1552 | return 0; |
1553 | } | |
1554 | ||
85863e47 MM |
1555 | const struct file_operations proc_pagemap_operations = { |
1556 | .llseek = mem_lseek, /* borrow this */ | |
1557 | .read = pagemap_read, | |
541c237c | 1558 | .open = pagemap_open, |
a06db751 | 1559 | .release = pagemap_release, |
85863e47 | 1560 | }; |
1e883281 | 1561 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
85863e47 | 1562 | |
6e21c8f1 | 1563 | #ifdef CONFIG_NUMA |
6e21c8f1 | 1564 | |
f69ff943 | 1565 | struct numa_maps { |
f69ff943 SW |
1566 | unsigned long pages; |
1567 | unsigned long anon; | |
1568 | unsigned long active; | |
1569 | unsigned long writeback; | |
1570 | unsigned long mapcount_max; | |
1571 | unsigned long dirty; | |
1572 | unsigned long swapcache; | |
1573 | unsigned long node[MAX_NUMNODES]; | |
1574 | }; | |
1575 | ||
5b52fc89 SW |
1576 | struct numa_maps_private { |
1577 | struct proc_maps_private proc_maps; | |
1578 | struct numa_maps md; | |
1579 | }; | |
1580 | ||
eb4866d0 DH |
1581 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
1582 | unsigned long nr_pages) | |
f69ff943 SW |
1583 | { |
1584 | int count = page_mapcount(page); | |
1585 | ||
eb4866d0 | 1586 | md->pages += nr_pages; |
f69ff943 | 1587 | if (pte_dirty || PageDirty(page)) |
eb4866d0 | 1588 | md->dirty += nr_pages; |
f69ff943 SW |
1589 | |
1590 | if (PageSwapCache(page)) | |
eb4866d0 | 1591 | md->swapcache += nr_pages; |
f69ff943 SW |
1592 | |
1593 | if (PageActive(page) || PageUnevictable(page)) | |
eb4866d0 | 1594 | md->active += nr_pages; |
f69ff943 SW |
1595 | |
1596 | if (PageWriteback(page)) | |
eb4866d0 | 1597 | md->writeback += nr_pages; |
f69ff943 SW |
1598 | |
1599 | if (PageAnon(page)) | |
eb4866d0 | 1600 | md->anon += nr_pages; |
f69ff943 SW |
1601 | |
1602 | if (count > md->mapcount_max) | |
1603 | md->mapcount_max = count; | |
1604 | ||
eb4866d0 | 1605 | md->node[page_to_nid(page)] += nr_pages; |
f69ff943 SW |
1606 | } |
1607 | ||
3200a8aa DH |
1608 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
1609 | unsigned long addr) | |
1610 | { | |
1611 | struct page *page; | |
1612 | int nid; | |
1613 | ||
1614 | if (!pte_present(pte)) | |
1615 | return NULL; | |
1616 | ||
1617 | page = vm_normal_page(vma, addr, pte); | |
1618 | if (!page) | |
1619 | return NULL; | |
1620 | ||
1621 | if (PageReserved(page)) | |
1622 | return NULL; | |
1623 | ||
1624 | nid = page_to_nid(page); | |
4ff1b2c2 | 1625 | if (!node_isset(nid, node_states[N_MEMORY])) |
3200a8aa DH |
1626 | return NULL; |
1627 | ||
1628 | return page; | |
1629 | } | |
1630 | ||
28093f9f GS |
1631 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
1632 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, | |
1633 | struct vm_area_struct *vma, | |
1634 | unsigned long addr) | |
1635 | { | |
1636 | struct page *page; | |
1637 | int nid; | |
1638 | ||
1639 | if (!pmd_present(pmd)) | |
1640 | return NULL; | |
1641 | ||
1642 | page = vm_normal_page_pmd(vma, addr, pmd); | |
1643 | if (!page) | |
1644 | return NULL; | |
1645 | ||
1646 | if (PageReserved(page)) | |
1647 | return NULL; | |
1648 | ||
1649 | nid = page_to_nid(page); | |
1650 | if (!node_isset(nid, node_states[N_MEMORY])) | |
1651 | return NULL; | |
1652 | ||
1653 | return page; | |
1654 | } | |
1655 | #endif | |
1656 | ||
f69ff943 SW |
1657 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
1658 | unsigned long end, struct mm_walk *walk) | |
1659 | { | |
d85f4d6d NH |
1660 | struct numa_maps *md = walk->private; |
1661 | struct vm_area_struct *vma = walk->vma; | |
f69ff943 SW |
1662 | spinlock_t *ptl; |
1663 | pte_t *orig_pte; | |
1664 | pte_t *pte; | |
1665 | ||
28093f9f | 1666 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
b6ec57f4 KS |
1667 | ptl = pmd_trans_huge_lock(pmd, vma); |
1668 | if (ptl) { | |
025c5b24 NH |
1669 | struct page *page; |
1670 | ||
28093f9f | 1671 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
025c5b24 | 1672 | if (page) |
28093f9f | 1673 | gather_stats(page, md, pmd_dirty(*pmd), |
025c5b24 | 1674 | HPAGE_PMD_SIZE/PAGE_SIZE); |
bf929152 | 1675 | spin_unlock(ptl); |
025c5b24 | 1676 | return 0; |
32ef4384 DH |
1677 | } |
1678 | ||
1a5a9906 AA |
1679 | if (pmd_trans_unstable(pmd)) |
1680 | return 0; | |
28093f9f | 1681 | #endif |
f69ff943 SW |
1682 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
1683 | do { | |
d85f4d6d | 1684 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
f69ff943 SW |
1685 | if (!page) |
1686 | continue; | |
eb4866d0 | 1687 | gather_stats(page, md, pte_dirty(*pte), 1); |
f69ff943 SW |
1688 | |
1689 | } while (pte++, addr += PAGE_SIZE, addr != end); | |
1690 | pte_unmap_unlock(orig_pte, ptl); | |
a66c0410 | 1691 | cond_resched(); |
f69ff943 SW |
1692 | return 0; |
1693 | } | |
1694 | #ifdef CONFIG_HUGETLB_PAGE | |
632fd60f | 1695 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1696 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1697 | { | |
5c2ff95e | 1698 | pte_t huge_pte = huge_ptep_get(pte); |
f69ff943 SW |
1699 | struct numa_maps *md; |
1700 | struct page *page; | |
1701 | ||
5c2ff95e | 1702 | if (!pte_present(huge_pte)) |
f69ff943 SW |
1703 | return 0; |
1704 | ||
5c2ff95e | 1705 | page = pte_page(huge_pte); |
f69ff943 SW |
1706 | if (!page) |
1707 | return 0; | |
1708 | ||
1709 | md = walk->private; | |
5c2ff95e | 1710 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
f69ff943 SW |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | #else | |
632fd60f | 1715 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
f69ff943 SW |
1716 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
1717 | { | |
1718 | return 0; | |
1719 | } | |
1720 | #endif | |
1721 | ||
1722 | /* | |
1723 | * Display pages allocated per node and memory policy via /proc. | |
1724 | */ | |
b7643757 | 1725 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
f69ff943 | 1726 | { |
5b52fc89 SW |
1727 | struct numa_maps_private *numa_priv = m->private; |
1728 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; | |
f69ff943 | 1729 | struct vm_area_struct *vma = v; |
5b52fc89 | 1730 | struct numa_maps *md = &numa_priv->md; |
f69ff943 SW |
1731 | struct file *file = vma->vm_file; |
1732 | struct mm_struct *mm = vma->vm_mm; | |
d85f4d6d NH |
1733 | struct mm_walk walk = { |
1734 | .hugetlb_entry = gather_hugetlb_stats, | |
1735 | .pmd_entry = gather_pte_stats, | |
1736 | .private = md, | |
1737 | .mm = mm, | |
1738 | }; | |
f69ff943 | 1739 | struct mempolicy *pol; |
948927ee DR |
1740 | char buffer[64]; |
1741 | int nid; | |
f69ff943 SW |
1742 | |
1743 | if (!mm) | |
1744 | return 0; | |
1745 | ||
5b52fc89 SW |
1746 | /* Ensure we start with an empty set of numa_maps statistics. */ |
1747 | memset(md, 0, sizeof(*md)); | |
f69ff943 | 1748 | |
498f2371 ON |
1749 | pol = __get_vma_policy(vma, vma->vm_start); |
1750 | if (pol) { | |
1751 | mpol_to_str(buffer, sizeof(buffer), pol); | |
1752 | mpol_cond_put(pol); | |
1753 | } else { | |
1754 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); | |
1755 | } | |
f69ff943 SW |
1756 | |
1757 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); | |
1758 | ||
1759 | if (file) { | |
17c2b4ee | 1760 | seq_puts(m, " file="); |
2726d566 | 1761 | seq_file_path(m, file, "\n\t= "); |
f69ff943 | 1762 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
17c2b4ee | 1763 | seq_puts(m, " heap"); |
b18cb64e | 1764 | } else if (is_stack(proc_priv, vma)) { |
65376df5 | 1765 | seq_puts(m, " stack"); |
f69ff943 SW |
1766 | } |
1767 | ||
fc360bd9 | 1768 | if (is_vm_hugetlb_page(vma)) |
17c2b4ee | 1769 | seq_puts(m, " huge"); |
fc360bd9 | 1770 | |
d85f4d6d NH |
1771 | /* mmap_sem is held by m_start */ |
1772 | walk_page_vma(vma, &walk); | |
f69ff943 SW |
1773 | |
1774 | if (!md->pages) | |
1775 | goto out; | |
1776 | ||
1777 | if (md->anon) | |
1778 | seq_printf(m, " anon=%lu", md->anon); | |
1779 | ||
1780 | if (md->dirty) | |
1781 | seq_printf(m, " dirty=%lu", md->dirty); | |
1782 | ||
1783 | if (md->pages != md->anon && md->pages != md->dirty) | |
1784 | seq_printf(m, " mapped=%lu", md->pages); | |
1785 | ||
1786 | if (md->mapcount_max > 1) | |
1787 | seq_printf(m, " mapmax=%lu", md->mapcount_max); | |
1788 | ||
1789 | if (md->swapcache) | |
1790 | seq_printf(m, " swapcache=%lu", md->swapcache); | |
1791 | ||
1792 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) | |
1793 | seq_printf(m, " active=%lu", md->active); | |
1794 | ||
1795 | if (md->writeback) | |
1796 | seq_printf(m, " writeback=%lu", md->writeback); | |
1797 | ||
948927ee DR |
1798 | for_each_node_state(nid, N_MEMORY) |
1799 | if (md->node[nid]) | |
1800 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); | |
198d1597 RA |
1801 | |
1802 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); | |
f69ff943 SW |
1803 | out: |
1804 | seq_putc(m, '\n'); | |
b8c20a9b | 1805 | m_cache_vma(m, vma); |
f69ff943 SW |
1806 | return 0; |
1807 | } | |
5b52fc89 | 1808 | |
b7643757 SP |
1809 | static int show_pid_numa_map(struct seq_file *m, void *v) |
1810 | { | |
1811 | return show_numa_map(m, v, 1); | |
1812 | } | |
1813 | ||
1814 | static int show_tid_numa_map(struct seq_file *m, void *v) | |
1815 | { | |
1816 | return show_numa_map(m, v, 0); | |
1817 | } | |
1818 | ||
03a44825 | 1819 | static const struct seq_operations proc_pid_numa_maps_op = { |
b7643757 SP |
1820 | .start = m_start, |
1821 | .next = m_next, | |
1822 | .stop = m_stop, | |
1823 | .show = show_pid_numa_map, | |
6e21c8f1 | 1824 | }; |
662795de | 1825 | |
b7643757 SP |
1826 | static const struct seq_operations proc_tid_numa_maps_op = { |
1827 | .start = m_start, | |
1828 | .next = m_next, | |
1829 | .stop = m_stop, | |
1830 | .show = show_tid_numa_map, | |
1831 | }; | |
1832 | ||
1833 | static int numa_maps_open(struct inode *inode, struct file *file, | |
1834 | const struct seq_operations *ops) | |
662795de | 1835 | { |
4db7d0ee ON |
1836 | return proc_maps_open(inode, file, ops, |
1837 | sizeof(struct numa_maps_private)); | |
662795de EB |
1838 | } |
1839 | ||
b7643757 SP |
1840 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
1841 | { | |
1842 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); | |
1843 | } | |
1844 | ||
1845 | static int tid_numa_maps_open(struct inode *inode, struct file *file) | |
1846 | { | |
1847 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); | |
1848 | } | |
1849 | ||
1850 | const struct file_operations proc_pid_numa_maps_operations = { | |
1851 | .open = pid_numa_maps_open, | |
1852 | .read = seq_read, | |
1853 | .llseek = seq_lseek, | |
29a40ace | 1854 | .release = proc_map_release, |
b7643757 SP |
1855 | }; |
1856 | ||
1857 | const struct file_operations proc_tid_numa_maps_operations = { | |
1858 | .open = tid_numa_maps_open, | |
662795de EB |
1859 | .read = seq_read, |
1860 | .llseek = seq_lseek, | |
29a40ace | 1861 | .release = proc_map_release, |
662795de | 1862 | }; |
f69ff943 | 1863 | #endif /* CONFIG_NUMA */ |