Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
31c9afa6 SL |
2 | /* |
3 | * mm/debug.c | |
4 | * | |
5 | * mm/ specific debug routines. | |
6 | * | |
7 | */ | |
8 | ||
82742a3a SL |
9 | #include <linux/kernel.h> |
10 | #include <linux/mm.h> | |
af658dca | 11 | #include <linux/trace_events.h> |
82742a3a | 12 | #include <linux/memcontrol.h> |
420adbe9 | 13 | #include <trace/events/mmflags.h> |
7cd12b4a | 14 | #include <linux/migrate.h> |
4e462112 | 15 | #include <linux/page_owner.h> |
f682a97a | 16 | #include <linux/ctype.h> |
82742a3a | 17 | |
edf14cdb | 18 | #include "internal.h" |
8eb42bea JH |
19 | #include <trace/events/migrate.h> |
20 | ||
21 | /* | |
22 | * Define EM() and EMe() so that MIGRATE_REASON from trace/events/migrate.h can | |
23 | * be used to populate migrate_reason_names[]. | |
24 | */ | |
25 | #undef EM | |
26 | #undef EMe | |
27 | #define EM(a, b) b, | |
28 | #define EMe(a, b) b | |
edf14cdb | 29 | |
9a2f45ff | 30 | const char *migrate_reason_names[MR_TYPES] = { |
8eb42bea | 31 | MIGRATE_REASON |
7cd12b4a VB |
32 | }; |
33 | ||
edf14cdb VB |
34 | const struct trace_print_flags pageflag_names[] = { |
35 | __def_pageflag_names, | |
36 | {0, NULL} | |
37 | }; | |
38 | ||
4c85c0be HY |
39 | const struct trace_print_flags pagetype_names[] = { |
40 | __def_pagetype_names, | |
41 | {0, NULL} | |
42 | }; | |
43 | ||
edf14cdb VB |
44 | const struct trace_print_flags gfpflag_names[] = { |
45 | __def_gfpflag_names, | |
46 | {0, NULL} | |
420adbe9 VB |
47 | }; |
48 | ||
edf14cdb VB |
49 | const struct trace_print_flags vmaflag_names[] = { |
50 | __def_vmaflag_names, | |
51 | {0, NULL} | |
82742a3a SL |
52 | }; |
53 | ||
fae7d834 MWO |
54 | static void __dump_folio(struct folio *folio, struct page *page, |
55 | unsigned long pfn, unsigned long idx) | |
82742a3a | 56 | { |
fae7d834 | 57 | struct address_space *mapping = folio_mapping(folio); |
7441d349 | 58 | int mapcount = atomic_read(&page->_mapcount); |
5b57b8f2 | 59 | char *type = ""; |
fc36def9 | 60 | |
7441d349 | 61 | mapcount = page_type_has_type(mapcount) ? 0 : mapcount + 1; |
fae7d834 MWO |
62 | pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n", |
63 | folio_ref_count(folio), mapcount, mapping, | |
64 | folio->index + idx, pfn); | |
65 | if (folio_test_large(folio)) { | |
05c5323b | 66 | pr_warn("head: order:%u mapcount:%d entire_mapcount:%d nr_pages_mapped:%d pincount:%d\n", |
fae7d834 | 67 | folio_order(folio), |
05c5323b | 68 | folio_mapcount(folio), |
91ec7f28 | 69 | folio_entire_mapcount(folio), |
eec20426 | 70 | folio_nr_pages_mapped(folio), |
94688e8e | 71 | atomic_read(&folio->_pincount)); |
452b557c | 72 | } |
91f5345a MWO |
73 | |
74 | #ifdef CONFIG_MEMCG | |
fae7d834 MWO |
75 | if (folio->memcg_data) |
76 | pr_warn("memcg:%lx\n", folio->memcg_data); | |
91f5345a | 77 | #endif |
fae7d834 | 78 | if (folio_test_ksm(folio)) |
5b57b8f2 | 79 | type = "ksm "; |
fae7d834 | 80 | else if (folio_test_anon(folio)) |
5b57b8f2 | 81 | type = "anon "; |
3e9d80a8 MWO |
82 | else if (mapping) |
83 | dump_mapping(mapping); | |
edf14cdb | 84 | BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); |
ff8e8116 | 85 | |
fae7d834 MWO |
86 | /* |
87 | * Accessing the pageblock without the zone lock. It could change to | |
88 | * "isolate" again in the meantime, but since we are just dumping the | |
89 | * state for debugging, it should be fine to accept a bit of | |
90 | * inaccuracy here due to racing. | |
91 | */ | |
92 | pr_warn("%sflags: %pGp%s\n", type, &folio->flags, | |
93 | is_migrate_cma_folio(folio, pfn) ? " CMA" : ""); | |
8f790d0c MWO |
94 | if (page_has_type(&folio->page)) |
95 | pr_warn("page_type: %pGt\n", &folio->page.page_type); | |
f2421a16 | 96 | |
e0392cf7 | 97 | print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32, |
46e8a3a0 VB |
98 | sizeof(unsigned long), page, |
99 | sizeof(struct page), false); | |
fae7d834 | 100 | if (folio_test_large(folio)) |
6197ab98 | 101 | print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32, |
fae7d834 MWO |
102 | sizeof(unsigned long), folio, |
103 | 2 * sizeof(struct page), false); | |
104 | } | |
105 | ||
106 | static void __dump_page(const struct page *page) | |
107 | { | |
108 | struct folio *foliop, folio; | |
109 | struct page precise; | |
110 | unsigned long pfn = page_to_pfn(page); | |
111 | unsigned long idx, nr_pages = 1; | |
112 | int loops = 5; | |
113 | ||
114 | again: | |
115 | memcpy(&precise, page, sizeof(*page)); | |
116 | foliop = page_folio(&precise); | |
117 | if (foliop == (struct folio *)&precise) { | |
118 | idx = 0; | |
119 | if (!folio_test_large(foliop)) | |
120 | goto dump; | |
121 | foliop = (struct folio *)page; | |
122 | } else { | |
123 | idx = folio_page_idx(foliop, page); | |
124 | } | |
125 | ||
126 | if (idx < MAX_FOLIO_NR_PAGES) { | |
127 | memcpy(&folio, foliop, 2 * sizeof(struct page)); | |
128 | nr_pages = folio_nr_pages(&folio); | |
129 | foliop = &folio; | |
130 | } | |
131 | ||
132 | if (idx > nr_pages) { | |
133 | if (loops-- > 0) | |
134 | goto again; | |
135 | pr_warn("page does not match folio\n"); | |
136 | precise.compound_head &= ~1UL; | |
137 | foliop = (struct folio *)&precise; | |
138 | idx = 0; | |
139 | } | |
140 | ||
141 | dump: | |
142 | __dump_folio(foliop, &precise, pfn, idx); | |
82742a3a SL |
143 | } |
144 | ||
b3a32033 | 145 | void dump_page(const struct page *page, const char *reason) |
82742a3a | 146 | { |
be7c701f MWO |
147 | if (PagePoisoned(page)) |
148 | pr_warn("page:%p is uninitialized and poisoned", page); | |
149 | else | |
150 | __dump_page(page); | |
151 | if (reason) | |
152 | pr_warn("page dumped because: %s\n", reason); | |
4e462112 | 153 | dump_page_owner(page); |
82742a3a SL |
154 | } |
155 | EXPORT_SYMBOL(dump_page); | |
156 | ||
157 | #ifdef CONFIG_DEBUG_VM | |
158 | ||
82742a3a SL |
159 | void dump_vma(const struct vm_area_struct *vma) |
160 | { | |
763ecb03 | 161 | pr_emerg("vma %px start %px end %px mm %px\n" |
152a2d19 MW |
162 | "prot %lx anon_vma %px vm_ops %px\n" |
163 | "pgoff %lx file %px private_data %px\n" | |
b8eceeb9 | 164 | "flags: %#lx(%pGv)\n", |
763ecb03 | 165 | vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm, |
82742a3a SL |
166 | (unsigned long)pgprot_val(vma->vm_page_prot), |
167 | vma->anon_vma, vma->vm_ops, vma->vm_pgoff, | |
b8eceeb9 VB |
168 | vma->vm_file, vma->vm_private_data, |
169 | vma->vm_flags, &vma->vm_flags); | |
82742a3a SL |
170 | } |
171 | EXPORT_SYMBOL(dump_vma); | |
172 | ||
31c9afa6 SL |
173 | void dump_mm(const struct mm_struct *mm) |
174 | { | |
763ecb03 | 175 | pr_emerg("mm %px task_size %lu\n" |
763ecb03 | 176 | "mmap_base %lu mmap_legacy_base %lu\n" |
152a2d19 | 177 | "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n" |
31c9afa6 | 178 | "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" |
70f8a3ca | 179 | "pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n" |
31c9afa6 SL |
180 | "start_code %lx end_code %lx start_data %lx end_data %lx\n" |
181 | "start_brk %lx brk %lx start_stack %lx\n" | |
182 | "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" | |
0258b5fd | 183 | "binfmt %px flags %lx\n" |
31c9afa6 | 184 | #ifdef CONFIG_AIO |
152a2d19 | 185 | "ioctx_table %px\n" |
31c9afa6 SL |
186 | #endif |
187 | #ifdef CONFIG_MEMCG | |
152a2d19 | 188 | "owner %px " |
31c9afa6 | 189 | #endif |
152a2d19 | 190 | "exe_file %px\n" |
31c9afa6 | 191 | #ifdef CONFIG_MMU_NOTIFIER |
984cfe4e | 192 | "notifier_subscriptions %px\n" |
31c9afa6 SL |
193 | #endif |
194 | #ifdef CONFIG_NUMA_BALANCING | |
195 | "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" | |
196 | #endif | |
31c9afa6 | 197 | "tlb_flush_pending %d\n" |
b8eceeb9 | 198 | "def_flags: %#lx(%pGv)\n", |
31c9afa6 | 199 | |
763ecb03 | 200 | mm, mm->task_size, |
763ecb03 | 201 | mm->mmap_base, mm->mmap_legacy_base, |
31c9afa6 SL |
202 | mm->pgd, atomic_read(&mm->mm_users), |
203 | atomic_read(&mm->mm_count), | |
af5b0f6a | 204 | mm_pgtables_bytes(mm), |
31c9afa6 SL |
205 | mm->map_count, |
206 | mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm, | |
44dc1b1f | 207 | (u64)atomic64_read(&mm->pinned_vm), |
70f8a3ca | 208 | mm->data_vm, mm->exec_vm, mm->stack_vm, |
31c9afa6 SL |
209 | mm->start_code, mm->end_code, mm->start_data, mm->end_data, |
210 | mm->start_brk, mm->brk, mm->start_stack, | |
211 | mm->arg_start, mm->arg_end, mm->env_start, mm->env_end, | |
0258b5fd | 212 | mm->binfmt, mm->flags, |
31c9afa6 SL |
213 | #ifdef CONFIG_AIO |
214 | mm->ioctx_table, | |
215 | #endif | |
216 | #ifdef CONFIG_MEMCG | |
217 | mm->owner, | |
218 | #endif | |
219 | mm->exe_file, | |
220 | #ifdef CONFIG_MMU_NOTIFIER | |
984cfe4e | 221 | mm->notifier_subscriptions, |
31c9afa6 SL |
222 | #endif |
223 | #ifdef CONFIG_NUMA_BALANCING | |
224 | mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq, | |
225 | #endif | |
16af97dc | 226 | atomic_read(&mm->tlb_flush_pending), |
b8eceeb9 VB |
227 | mm->def_flags, &mm->def_flags |
228 | ); | |
31c9afa6 | 229 | } |
c2fdc235 | 230 | EXPORT_SYMBOL(dump_mm); |
31c9afa6 | 231 | |
f682a97a AD |
232 | static bool page_init_poisoning __read_mostly = true; |
233 | ||
234 | static int __init setup_vm_debug(char *str) | |
235 | { | |
236 | bool __page_init_poisoning = true; | |
237 | ||
238 | /* | |
239 | * Calling vm_debug with no arguments is equivalent to requesting | |
240 | * to enable all debugging options we can control. | |
241 | */ | |
242 | if (*str++ != '=' || !*str) | |
243 | goto out; | |
244 | ||
245 | __page_init_poisoning = false; | |
246 | if (*str == '-') | |
247 | goto out; | |
248 | ||
249 | while (*str) { | |
250 | switch (tolower(*str)) { | |
251 | case'p': | |
252 | __page_init_poisoning = true; | |
253 | break; | |
254 | default: | |
255 | pr_err("vm_debug option '%c' unknown. skipped\n", | |
256 | *str); | |
257 | } | |
258 | ||
259 | str++; | |
260 | } | |
261 | out: | |
262 | if (page_init_poisoning && !__page_init_poisoning) | |
263 | pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n"); | |
264 | ||
265 | page_init_poisoning = __page_init_poisoning; | |
266 | ||
267 | return 1; | |
268 | } | |
269 | __setup("vm_debug", setup_vm_debug); | |
270 | ||
271 | void page_init_poison(struct page *page, size_t size) | |
272 | { | |
273 | if (page_init_poisoning) | |
274 | memset(page, PAGE_POISON_PATTERN, size); | |
275 | } | |
b50e195f LH |
276 | |
277 | void vma_iter_dump_tree(const struct vma_iterator *vmi) | |
278 | { | |
279 | #if defined(CONFIG_DEBUG_VM_MAPLE_TREE) | |
280 | mas_dump(&vmi->mas); | |
281 | mt_dump(vmi->mas.tree, mt_dump_hex); | |
282 | #endif /* CONFIG_DEBUG_VM_MAPLE_TREE */ | |
283 | } | |
284 | ||
82742a3a | 285 | #endif /* CONFIG_DEBUG_VM */ |