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