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Commit | Line | Data |
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48c96a36 JK |
1 | #include <linux/debugfs.h> |
2 | #include <linux/mm.h> | |
3 | #include <linux/slab.h> | |
4 | #include <linux/uaccess.h> | |
5 | #include <linux/bootmem.h> | |
6 | #include <linux/stacktrace.h> | |
7 | #include <linux/page_owner.h> | |
7dd80b8a | 8 | #include <linux/jump_label.h> |
7cd12b4a | 9 | #include <linux/migrate.h> |
f2ca0b55 | 10 | #include <linux/stackdepot.h> |
e2f612e6 | 11 | #include <linux/seq_file.h> |
f2ca0b55 | 12 | |
48c96a36 JK |
13 | #include "internal.h" |
14 | ||
f2ca0b55 JK |
15 | /* |
16 | * TODO: teach PAGE_OWNER_STACK_DEPTH (__dump_page_owner and save_stack) | |
17 | * to use off stack temporal storage | |
18 | */ | |
19 | #define PAGE_OWNER_STACK_DEPTH (16) | |
20 | ||
48c96a36 | 21 | static bool page_owner_disabled = true; |
7dd80b8a | 22 | DEFINE_STATIC_KEY_FALSE(page_owner_inited); |
48c96a36 | 23 | |
f2ca0b55 JK |
24 | static depot_stack_handle_t dummy_handle; |
25 | static depot_stack_handle_t failure_handle; | |
26 | ||
61cf5feb JK |
27 | static void init_early_allocated_pages(void); |
28 | ||
48c96a36 JK |
29 | static int early_page_owner_param(char *buf) |
30 | { | |
31 | if (!buf) | |
32 | return -EINVAL; | |
33 | ||
34 | if (strcmp(buf, "on") == 0) | |
35 | page_owner_disabled = false; | |
36 | ||
37 | return 0; | |
38 | } | |
39 | early_param("page_owner", early_page_owner_param); | |
40 | ||
41 | static bool need_page_owner(void) | |
42 | { | |
43 | if (page_owner_disabled) | |
44 | return false; | |
45 | ||
46 | return true; | |
47 | } | |
48 | ||
f2ca0b55 JK |
49 | static noinline void register_dummy_stack(void) |
50 | { | |
51 | unsigned long entries[4]; | |
52 | struct stack_trace dummy; | |
53 | ||
54 | dummy.nr_entries = 0; | |
55 | dummy.max_entries = ARRAY_SIZE(entries); | |
56 | dummy.entries = &entries[0]; | |
57 | dummy.skip = 0; | |
58 | ||
59 | save_stack_trace(&dummy); | |
60 | dummy_handle = depot_save_stack(&dummy, GFP_KERNEL); | |
61 | } | |
62 | ||
63 | static noinline void register_failure_stack(void) | |
64 | { | |
65 | unsigned long entries[4]; | |
66 | struct stack_trace failure; | |
67 | ||
68 | failure.nr_entries = 0; | |
69 | failure.max_entries = ARRAY_SIZE(entries); | |
70 | failure.entries = &entries[0]; | |
71 | failure.skip = 0; | |
72 | ||
73 | save_stack_trace(&failure); | |
74 | failure_handle = depot_save_stack(&failure, GFP_KERNEL); | |
75 | } | |
76 | ||
48c96a36 JK |
77 | static void init_page_owner(void) |
78 | { | |
79 | if (page_owner_disabled) | |
80 | return; | |
81 | ||
f2ca0b55 JK |
82 | register_dummy_stack(); |
83 | register_failure_stack(); | |
7dd80b8a | 84 | static_branch_enable(&page_owner_inited); |
61cf5feb | 85 | init_early_allocated_pages(); |
48c96a36 JK |
86 | } |
87 | ||
88 | struct page_ext_operations page_owner_ops = { | |
89 | .need = need_page_owner, | |
90 | .init = init_page_owner, | |
91 | }; | |
92 | ||
93 | void __reset_page_owner(struct page *page, unsigned int order) | |
94 | { | |
95 | int i; | |
96 | struct page_ext *page_ext; | |
97 | ||
98 | for (i = 0; i < (1 << order); i++) { | |
99 | page_ext = lookup_page_ext(page + i); | |
f86e4271 YS |
100 | if (unlikely(!page_ext)) |
101 | continue; | |
48c96a36 JK |
102 | __clear_bit(PAGE_EXT_OWNER, &page_ext->flags); |
103 | } | |
104 | } | |
105 | ||
f2ca0b55 JK |
106 | static inline bool check_recursive_alloc(struct stack_trace *trace, |
107 | unsigned long ip) | |
48c96a36 | 108 | { |
f2ca0b55 JK |
109 | int i, count; |
110 | ||
111 | if (!trace->nr_entries) | |
112 | return false; | |
113 | ||
114 | for (i = 0, count = 0; i < trace->nr_entries; i++) { | |
115 | if (trace->entries[i] == ip && ++count == 2) | |
116 | return true; | |
117 | } | |
f86e4271 | 118 | |
f2ca0b55 JK |
119 | return false; |
120 | } | |
121 | ||
122 | static noinline depot_stack_handle_t save_stack(gfp_t flags) | |
123 | { | |
124 | unsigned long entries[PAGE_OWNER_STACK_DEPTH]; | |
94f759d6 SR |
125 | struct stack_trace trace = { |
126 | .nr_entries = 0, | |
f2ca0b55 JK |
127 | .entries = entries, |
128 | .max_entries = PAGE_OWNER_STACK_DEPTH, | |
129 | .skip = 0 | |
94f759d6 | 130 | }; |
f2ca0b55 JK |
131 | depot_stack_handle_t handle; |
132 | ||
133 | save_stack_trace(&trace); | |
134 | if (trace.nr_entries != 0 && | |
135 | trace.entries[trace.nr_entries-1] == ULONG_MAX) | |
136 | trace.nr_entries--; | |
137 | ||
138 | /* | |
139 | * We need to check recursion here because our request to stackdepot | |
140 | * could trigger memory allocation to save new entry. New memory | |
141 | * allocation would reach here and call depot_save_stack() again | |
142 | * if we don't catch it. There is still not enough memory in stackdepot | |
143 | * so it would try to allocate memory again and loop forever. | |
144 | */ | |
145 | if (check_recursive_alloc(&trace, _RET_IP_)) | |
146 | return dummy_handle; | |
147 | ||
148 | handle = depot_save_stack(&trace, flags); | |
149 | if (!handle) | |
150 | handle = failure_handle; | |
151 | ||
152 | return handle; | |
153 | } | |
154 | ||
155 | noinline void __set_page_owner(struct page *page, unsigned int order, | |
156 | gfp_t gfp_mask) | |
157 | { | |
158 | struct page_ext *page_ext = lookup_page_ext(page); | |
48c96a36 | 159 | |
f86e4271 YS |
160 | if (unlikely(!page_ext)) |
161 | return; | |
162 | ||
f2ca0b55 | 163 | page_ext->handle = save_stack(gfp_mask); |
48c96a36 JK |
164 | page_ext->order = order; |
165 | page_ext->gfp_mask = gfp_mask; | |
7cd12b4a | 166 | page_ext->last_migrate_reason = -1; |
48c96a36 JK |
167 | |
168 | __set_bit(PAGE_EXT_OWNER, &page_ext->flags); | |
169 | } | |
170 | ||
7cd12b4a VB |
171 | void __set_page_owner_migrate_reason(struct page *page, int reason) |
172 | { | |
173 | struct page_ext *page_ext = lookup_page_ext(page); | |
f86e4271 YS |
174 | if (unlikely(!page_ext)) |
175 | return; | |
7cd12b4a VB |
176 | |
177 | page_ext->last_migrate_reason = reason; | |
178 | } | |
179 | ||
a9627bc5 | 180 | void __split_page_owner(struct page *page, unsigned int order) |
e2cfc911 | 181 | { |
a9627bc5 | 182 | int i; |
e2cfc911 | 183 | struct page_ext *page_ext = lookup_page_ext(page); |
a9627bc5 | 184 | |
f86e4271 | 185 | if (unlikely(!page_ext)) |
a9627bc5 | 186 | return; |
e2cfc911 | 187 | |
a9627bc5 JK |
188 | page_ext->order = 0; |
189 | for (i = 1; i < (1 << order); i++) | |
190 | __copy_page_owner(page, page + i); | |
e2cfc911 JK |
191 | } |
192 | ||
d435edca VB |
193 | void __copy_page_owner(struct page *oldpage, struct page *newpage) |
194 | { | |
195 | struct page_ext *old_ext = lookup_page_ext(oldpage); | |
196 | struct page_ext *new_ext = lookup_page_ext(newpage); | |
d435edca | 197 | |
f86e4271 YS |
198 | if (unlikely(!old_ext || !new_ext)) |
199 | return; | |
200 | ||
d435edca VB |
201 | new_ext->order = old_ext->order; |
202 | new_ext->gfp_mask = old_ext->gfp_mask; | |
a8efe1c9 | 203 | new_ext->last_migrate_reason = old_ext->last_migrate_reason; |
f2ca0b55 | 204 | new_ext->handle = old_ext->handle; |
d435edca VB |
205 | |
206 | /* | |
207 | * We don't clear the bit on the oldpage as it's going to be freed | |
208 | * after migration. Until then, the info can be useful in case of | |
209 | * a bug, and the overal stats will be off a bit only temporarily. | |
210 | * Also, migrate_misplaced_transhuge_page() can still fail the | |
211 | * migration and then we want the oldpage to retain the info. But | |
212 | * in that case we also don't need to explicitly clear the info from | |
213 | * the new page, which will be freed. | |
214 | */ | |
215 | __set_bit(PAGE_EXT_OWNER, &new_ext->flags); | |
216 | } | |
217 | ||
e2f612e6 JK |
218 | void pagetypeinfo_showmixedcount_print(struct seq_file *m, |
219 | pg_data_t *pgdat, struct zone *zone) | |
220 | { | |
221 | struct page *page; | |
222 | struct page_ext *page_ext; | |
223 | unsigned long pfn = zone->zone_start_pfn, block_end_pfn; | |
224 | unsigned long end_pfn = pfn + zone->spanned_pages; | |
225 | unsigned long count[MIGRATE_TYPES] = { 0, }; | |
226 | int pageblock_mt, page_mt; | |
227 | int i; | |
228 | ||
229 | /* Scan block by block. First and last block may be incomplete */ | |
230 | pfn = zone->zone_start_pfn; | |
231 | ||
232 | /* | |
233 | * Walk the zone in pageblock_nr_pages steps. If a page block spans | |
234 | * a zone boundary, it will be double counted between zones. This does | |
235 | * not matter as the mixed block count will still be correct | |
236 | */ | |
237 | for (; pfn < end_pfn; ) { | |
238 | if (!pfn_valid(pfn)) { | |
239 | pfn = ALIGN(pfn + 1, MAX_ORDER_NR_PAGES); | |
240 | continue; | |
241 | } | |
242 | ||
243 | block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); | |
244 | block_end_pfn = min(block_end_pfn, end_pfn); | |
245 | ||
246 | page = pfn_to_page(pfn); | |
247 | pageblock_mt = get_pageblock_migratetype(page); | |
248 | ||
249 | for (; pfn < block_end_pfn; pfn++) { | |
250 | if (!pfn_valid_within(pfn)) | |
251 | continue; | |
252 | ||
253 | page = pfn_to_page(pfn); | |
254 | ||
255 | if (page_zone(page) != zone) | |
256 | continue; | |
257 | ||
258 | if (PageBuddy(page)) { | |
259 | pfn += (1UL << page_order(page)) - 1; | |
260 | continue; | |
261 | } | |
262 | ||
263 | if (PageReserved(page)) | |
264 | continue; | |
265 | ||
266 | page_ext = lookup_page_ext(page); | |
267 | if (unlikely(!page_ext)) | |
268 | continue; | |
269 | ||
270 | if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) | |
271 | continue; | |
272 | ||
273 | page_mt = gfpflags_to_migratetype(page_ext->gfp_mask); | |
274 | if (pageblock_mt != page_mt) { | |
275 | if (is_migrate_cma(pageblock_mt)) | |
276 | count[MIGRATE_MOVABLE]++; | |
277 | else | |
278 | count[pageblock_mt]++; | |
279 | ||
280 | pfn = block_end_pfn; | |
281 | break; | |
282 | } | |
283 | pfn += (1UL << page_ext->order) - 1; | |
284 | } | |
285 | } | |
286 | ||
287 | /* Print counts */ | |
288 | seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name); | |
289 | for (i = 0; i < MIGRATE_TYPES; i++) | |
290 | seq_printf(m, "%12lu ", count[i]); | |
291 | seq_putc(m, '\n'); | |
292 | } | |
293 | ||
48c96a36 JK |
294 | static ssize_t |
295 | print_page_owner(char __user *buf, size_t count, unsigned long pfn, | |
f2ca0b55 JK |
296 | struct page *page, struct page_ext *page_ext, |
297 | depot_stack_handle_t handle) | |
48c96a36 JK |
298 | { |
299 | int ret; | |
300 | int pageblock_mt, page_mt; | |
301 | char *kbuf; | |
f2ca0b55 | 302 | unsigned long entries[PAGE_OWNER_STACK_DEPTH]; |
94f759d6 | 303 | struct stack_trace trace = { |
f2ca0b55 JK |
304 | .nr_entries = 0, |
305 | .entries = entries, | |
306 | .max_entries = PAGE_OWNER_STACK_DEPTH, | |
307 | .skip = 0 | |
94f759d6 | 308 | }; |
48c96a36 JK |
309 | |
310 | kbuf = kmalloc(count, GFP_KERNEL); | |
311 | if (!kbuf) | |
312 | return -ENOMEM; | |
313 | ||
314 | ret = snprintf(kbuf, count, | |
60f30350 VB |
315 | "Page allocated via order %u, mask %#x(%pGg)\n", |
316 | page_ext->order, page_ext->gfp_mask, | |
317 | &page_ext->gfp_mask); | |
48c96a36 JK |
318 | |
319 | if (ret >= count) | |
320 | goto err; | |
321 | ||
322 | /* Print information relevant to grouping pages by mobility */ | |
0b423ca2 | 323 | pageblock_mt = get_pageblock_migratetype(page); |
48c96a36 JK |
324 | page_mt = gfpflags_to_migratetype(page_ext->gfp_mask); |
325 | ret += snprintf(kbuf + ret, count - ret, | |
60f30350 | 326 | "PFN %lu type %s Block %lu type %s Flags %#lx(%pGp)\n", |
48c96a36 | 327 | pfn, |
60f30350 | 328 | migratetype_names[page_mt], |
48c96a36 | 329 | pfn >> pageblock_order, |
60f30350 VB |
330 | migratetype_names[pageblock_mt], |
331 | page->flags, &page->flags); | |
48c96a36 JK |
332 | |
333 | if (ret >= count) | |
334 | goto err; | |
335 | ||
f2ca0b55 | 336 | depot_fetch_stack(handle, &trace); |
94f759d6 | 337 | ret += snprint_stack_trace(kbuf + ret, count - ret, &trace, 0); |
48c96a36 JK |
338 | if (ret >= count) |
339 | goto err; | |
340 | ||
7cd12b4a VB |
341 | if (page_ext->last_migrate_reason != -1) { |
342 | ret += snprintf(kbuf + ret, count - ret, | |
343 | "Page has been migrated, last migrate reason: %s\n", | |
344 | migrate_reason_names[page_ext->last_migrate_reason]); | |
345 | if (ret >= count) | |
346 | goto err; | |
347 | } | |
348 | ||
48c96a36 JK |
349 | ret += snprintf(kbuf + ret, count - ret, "\n"); |
350 | if (ret >= count) | |
351 | goto err; | |
352 | ||
353 | if (copy_to_user(buf, kbuf, ret)) | |
354 | ret = -EFAULT; | |
355 | ||
356 | kfree(kbuf); | |
357 | return ret; | |
358 | ||
359 | err: | |
360 | kfree(kbuf); | |
361 | return -ENOMEM; | |
362 | } | |
363 | ||
4e462112 VB |
364 | void __dump_page_owner(struct page *page) |
365 | { | |
366 | struct page_ext *page_ext = lookup_page_ext(page); | |
f2ca0b55 | 367 | unsigned long entries[PAGE_OWNER_STACK_DEPTH]; |
4e462112 | 368 | struct stack_trace trace = { |
f2ca0b55 JK |
369 | .nr_entries = 0, |
370 | .entries = entries, | |
371 | .max_entries = PAGE_OWNER_STACK_DEPTH, | |
372 | .skip = 0 | |
4e462112 | 373 | }; |
f2ca0b55 | 374 | depot_stack_handle_t handle; |
8285027f SM |
375 | gfp_t gfp_mask; |
376 | int mt; | |
4e462112 | 377 | |
f86e4271 YS |
378 | if (unlikely(!page_ext)) { |
379 | pr_alert("There is not page extension available.\n"); | |
380 | return; | |
381 | } | |
8285027f SM |
382 | gfp_mask = page_ext->gfp_mask; |
383 | mt = gfpflags_to_migratetype(gfp_mask); | |
f86e4271 | 384 | |
4e462112 VB |
385 | if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) { |
386 | pr_alert("page_owner info is not active (free page?)\n"); | |
387 | return; | |
388 | } | |
389 | ||
f2ca0b55 JK |
390 | handle = READ_ONCE(page_ext->handle); |
391 | if (!handle) { | |
392 | pr_alert("page_owner info is not active (free page?)\n"); | |
393 | return; | |
394 | } | |
395 | ||
396 | depot_fetch_stack(handle, &trace); | |
756a025f JP |
397 | pr_alert("page allocated via order %u, migratetype %s, gfp_mask %#x(%pGg)\n", |
398 | page_ext->order, migratetype_names[mt], gfp_mask, &gfp_mask); | |
4e462112 VB |
399 | print_stack_trace(&trace, 0); |
400 | ||
401 | if (page_ext->last_migrate_reason != -1) | |
402 | pr_alert("page has been migrated, last migrate reason: %s\n", | |
403 | migrate_reason_names[page_ext->last_migrate_reason]); | |
404 | } | |
405 | ||
48c96a36 JK |
406 | static ssize_t |
407 | read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
408 | { | |
409 | unsigned long pfn; | |
410 | struct page *page; | |
411 | struct page_ext *page_ext; | |
f2ca0b55 | 412 | depot_stack_handle_t handle; |
48c96a36 | 413 | |
7dd80b8a | 414 | if (!static_branch_unlikely(&page_owner_inited)) |
48c96a36 JK |
415 | return -EINVAL; |
416 | ||
417 | page = NULL; | |
418 | pfn = min_low_pfn + *ppos; | |
419 | ||
420 | /* Find a valid PFN or the start of a MAX_ORDER_NR_PAGES area */ | |
421 | while (!pfn_valid(pfn) && (pfn & (MAX_ORDER_NR_PAGES - 1)) != 0) | |
422 | pfn++; | |
423 | ||
424 | drain_all_pages(NULL); | |
425 | ||
426 | /* Find an allocated page */ | |
427 | for (; pfn < max_pfn; pfn++) { | |
428 | /* | |
429 | * If the new page is in a new MAX_ORDER_NR_PAGES area, | |
430 | * validate the area as existing, skip it if not | |
431 | */ | |
432 | if ((pfn & (MAX_ORDER_NR_PAGES - 1)) == 0 && !pfn_valid(pfn)) { | |
433 | pfn += MAX_ORDER_NR_PAGES - 1; | |
434 | continue; | |
435 | } | |
436 | ||
437 | /* Check for holes within a MAX_ORDER area */ | |
438 | if (!pfn_valid_within(pfn)) | |
439 | continue; | |
440 | ||
441 | page = pfn_to_page(pfn); | |
442 | if (PageBuddy(page)) { | |
443 | unsigned long freepage_order = page_order_unsafe(page); | |
444 | ||
445 | if (freepage_order < MAX_ORDER) | |
446 | pfn += (1UL << freepage_order) - 1; | |
447 | continue; | |
448 | } | |
449 | ||
450 | page_ext = lookup_page_ext(page); | |
f86e4271 YS |
451 | if (unlikely(!page_ext)) |
452 | continue; | |
48c96a36 JK |
453 | |
454 | /* | |
61cf5feb JK |
455 | * Some pages could be missed by concurrent allocation or free, |
456 | * because we don't hold the zone lock. | |
48c96a36 JK |
457 | */ |
458 | if (!test_bit(PAGE_EXT_OWNER, &page_ext->flags)) | |
459 | continue; | |
460 | ||
f2ca0b55 JK |
461 | /* |
462 | * Access to page_ext->handle isn't synchronous so we should | |
463 | * be careful to access it. | |
464 | */ | |
465 | handle = READ_ONCE(page_ext->handle); | |
466 | if (!handle) | |
467 | continue; | |
468 | ||
48c96a36 JK |
469 | /* Record the next PFN to read in the file offset */ |
470 | *ppos = (pfn - min_low_pfn) + 1; | |
471 | ||
f2ca0b55 JK |
472 | return print_page_owner(buf, count, pfn, page, |
473 | page_ext, handle); | |
48c96a36 JK |
474 | } |
475 | ||
476 | return 0; | |
477 | } | |
478 | ||
61cf5feb JK |
479 | static void init_pages_in_zone(pg_data_t *pgdat, struct zone *zone) |
480 | { | |
481 | struct page *page; | |
482 | struct page_ext *page_ext; | |
483 | unsigned long pfn = zone->zone_start_pfn, block_end_pfn; | |
484 | unsigned long end_pfn = pfn + zone->spanned_pages; | |
485 | unsigned long count = 0; | |
486 | ||
487 | /* Scan block by block. First and last block may be incomplete */ | |
488 | pfn = zone->zone_start_pfn; | |
489 | ||
490 | /* | |
491 | * Walk the zone in pageblock_nr_pages steps. If a page block spans | |
492 | * a zone boundary, it will be double counted between zones. This does | |
493 | * not matter as the mixed block count will still be correct | |
494 | */ | |
495 | for (; pfn < end_pfn; ) { | |
496 | if (!pfn_valid(pfn)) { | |
497 | pfn = ALIGN(pfn + 1, MAX_ORDER_NR_PAGES); | |
498 | continue; | |
499 | } | |
500 | ||
501 | block_end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); | |
502 | block_end_pfn = min(block_end_pfn, end_pfn); | |
503 | ||
504 | page = pfn_to_page(pfn); | |
505 | ||
506 | for (; pfn < block_end_pfn; pfn++) { | |
507 | if (!pfn_valid_within(pfn)) | |
508 | continue; | |
509 | ||
510 | page = pfn_to_page(pfn); | |
511 | ||
9d43f5ae JK |
512 | if (page_zone(page) != zone) |
513 | continue; | |
514 | ||
61cf5feb JK |
515 | /* |
516 | * We are safe to check buddy flag and order, because | |
517 | * this is init stage and only single thread runs. | |
518 | */ | |
519 | if (PageBuddy(page)) { | |
520 | pfn += (1UL << page_order(page)) - 1; | |
521 | continue; | |
522 | } | |
523 | ||
524 | if (PageReserved(page)) | |
525 | continue; | |
526 | ||
527 | page_ext = lookup_page_ext(page); | |
f86e4271 YS |
528 | if (unlikely(!page_ext)) |
529 | continue; | |
61cf5feb JK |
530 | |
531 | /* Maybe overraping zone */ | |
532 | if (test_bit(PAGE_EXT_OWNER, &page_ext->flags)) | |
533 | continue; | |
534 | ||
535 | /* Found early allocated page */ | |
536 | set_page_owner(page, 0, 0); | |
537 | count++; | |
538 | } | |
539 | } | |
540 | ||
541 | pr_info("Node %d, zone %8s: page owner found early allocated %lu pages\n", | |
542 | pgdat->node_id, zone->name, count); | |
543 | } | |
544 | ||
545 | static void init_zones_in_node(pg_data_t *pgdat) | |
546 | { | |
547 | struct zone *zone; | |
548 | struct zone *node_zones = pgdat->node_zones; | |
549 | unsigned long flags; | |
550 | ||
551 | for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) { | |
552 | if (!populated_zone(zone)) | |
553 | continue; | |
554 | ||
555 | spin_lock_irqsave(&zone->lock, flags); | |
556 | init_pages_in_zone(pgdat, zone); | |
557 | spin_unlock_irqrestore(&zone->lock, flags); | |
558 | } | |
559 | } | |
560 | ||
561 | static void init_early_allocated_pages(void) | |
562 | { | |
563 | pg_data_t *pgdat; | |
564 | ||
565 | drain_all_pages(NULL); | |
566 | for_each_online_pgdat(pgdat) | |
567 | init_zones_in_node(pgdat); | |
568 | } | |
569 | ||
48c96a36 JK |
570 | static const struct file_operations proc_page_owner_operations = { |
571 | .read = read_page_owner, | |
572 | }; | |
573 | ||
574 | static int __init pageowner_init(void) | |
575 | { | |
576 | struct dentry *dentry; | |
577 | ||
7dd80b8a | 578 | if (!static_branch_unlikely(&page_owner_inited)) { |
48c96a36 JK |
579 | pr_info("page_owner is disabled\n"); |
580 | return 0; | |
581 | } | |
582 | ||
583 | dentry = debugfs_create_file("page_owner", S_IRUSR, NULL, | |
584 | NULL, &proc_page_owner_operations); | |
585 | if (IS_ERR(dentry)) | |
586 | return PTR_ERR(dentry); | |
587 | ||
588 | return 0; | |
589 | } | |
44c5af96 | 590 | late_initcall(pageowner_init) |