1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * mm/debug.c
4 *
5 * mm/ specific debug routines.
6 *
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/trace_events.h>
12 #include <linux/memcontrol.h>
13 #include <trace/events/mmflags.h>
14 #include <linux/migrate.h>
15 #include <linux/page_owner.h>
16 #include <linux/ctype.h>
17
18 #include "internal.h"
19 #include <trace/events/migrate.h>
20
21 /*
22 * Define EM() and EMe() so that MIGRATE_REASO
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
29
30 const char *migrate_reason_names[MR_TYPES] = {
31 MIGRATE_REASON
32 };
33
34 const struct trace_print_flags pageflag_names[
35 __def_pageflag_names,
36 {0, NULL}
37 };
38
39 const struct trace_print_flags gfpflag_names[]
40 __def_gfpflag_names,
41 {0, NULL}
42 };
43
44 const struct trace_print_flags vmaflag_names[]
45 __def_vmaflag_names,
46 {0, NULL}
47 };
48
49 #define DEF_PAGETYPE_NAME(_name) [PGTY_##_name
50
51 static const char *page_type_names[] = {
52 DEF_PAGETYPE_NAME(slab),
53 DEF_PAGETYPE_NAME(hugetlb),
54 DEF_PAGETYPE_NAME(offline),
55 DEF_PAGETYPE_NAME(guard),
56 DEF_PAGETYPE_NAME(table),
57 DEF_PAGETYPE_NAME(buddy),
58 DEF_PAGETYPE_NAME(unaccepted),
59 };
60
61 static const char *page_type_name(unsigned int
62 {
63 unsigned i = (page_type >> 24) - 0xf0;
64
65 if (i >= ARRAY_SIZE(page_type_names))
66 return "unknown";
67 return page_type_names[i];
68 }
69
70 static void __dump_folio(struct folio *folio,
71 unsigned long pfn, unsigned lo
72 {
73 struct address_space *mapping = folio_
74 int mapcount = atomic_read(&page->_map
75 char *type = "";
76
77 mapcount = page_mapcount_is_type(mapco
78 pr_warn("page: refcount:%d mapcount:%d
79 folio_ref_count(folio)
80 folio->index + idx, pf
81 if (folio_test_large(folio)) {
82 pr_warn("head: order:%u mapcou
83 folio_order(fo
84 folio_mapcount
85 folio_entire_m
86 folio_nr_pages
87 atomic_read(&f
88 }
89
90 #ifdef CONFIG_MEMCG
91 if (folio->memcg_data)
92 pr_warn("memcg:%lx\n", folio->
93 #endif
94 if (folio_test_ksm(folio))
95 type = "ksm ";
96 else if (folio_test_anon(folio))
97 type = "anon ";
98 else if (mapping)
99 dump_mapping(mapping);
100 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names
101
102 /*
103 * Accessing the pageblock without the
104 * "isolate" again in the meantime, bu
105 * state for debugging, it should be f
106 * inaccuracy here due to racing.
107 */
108 pr_warn("%sflags: %pGp%s\n", type, &fo
109 is_migrate_cma_folio(folio, pf
110 if (page_has_type(&folio->page))
111 pr_warn("page_type: %x(%s)\n",
112 page_type_name
113
114 print_hex_dump(KERN_WARNING, "raw: ",
115 sizeof(unsigned long),
116 sizeof(struct page), f
117 if (folio_test_large(folio))
118 print_hex_dump(KERN_WARNING, "
119 sizeof(unsigned long),
120 2 * sizeof(struct page
121 }
122
123 static void __dump_page(const struct page *pag
124 {
125 struct folio *foliop, folio;
126 struct page precise;
127 unsigned long pfn = page_to_pfn(page);
128 unsigned long idx, nr_pages = 1;
129 int loops = 5;
130
131 again:
132 memcpy(&precise, page, sizeof(*page));
133 foliop = page_folio(&precise);
134 if (foliop == (struct folio *)&precise
135 idx = 0;
136 if (!folio_test_large(foliop))
137 goto dump;
138 foliop = (struct folio *)page;
139 } else {
140 idx = folio_page_idx(foliop, p
141 }
142
143 if (idx < MAX_FOLIO_NR_PAGES) {
144 memcpy(&folio, foliop, 2 * siz
145 nr_pages = folio_nr_pages(&fol
146 foliop = &folio;
147 }
148
149 if (idx > nr_pages) {
150 if (loops-- > 0)
151 goto again;
152 pr_warn("page does not match f
153 precise.compound_head &= ~1UL;
154 foliop = (struct folio *)&prec
155 idx = 0;
156 }
157
158 dump:
159 __dump_folio(foliop, &precise, pfn, id
160 }
161
162 void dump_page(const struct page *page, const
163 {
164 if (PagePoisoned(page))
165 pr_warn("page:%p is uninitiali
166 else
167 __dump_page(page);
168 if (reason)
169 pr_warn("page dumped because:
170 dump_page_owner(page);
171 }
172 EXPORT_SYMBOL(dump_page);
173
174 #ifdef CONFIG_DEBUG_VM
175
176 void dump_vma(const struct vm_area_struct *vma
177 {
178 pr_emerg("vma %px start %px end %px mm
179 "prot %lx anon_vma %px vm_ops
180 "pgoff %lx file %px private_da
181 "flags: %#lx(%pGv)\n",
182 vma, (void *)vma->vm_start, (v
183 (unsigned long)pgprot_val(vma-
184 vma->anon_vma, vma->vm_ops, vm
185 vma->vm_file, vma->vm_private_
186 vma->vm_flags, &vma->vm_flags)
187 }
188 EXPORT_SYMBOL(dump_vma);
189
190 void dump_mm(const struct mm_struct *mm)
191 {
192 pr_emerg("mm %px task_size %lu\n"
193 "mmap_base %lu mmap_legacy_bas
194 "pgd %px mm_users %d mm_count
195 "hiwater_rss %lx hiwater_vm %l
196 "pinned_vm %llx data_vm %lx ex
197 "start_code %lx end_code %lx s
198 "start_brk %lx brk %lx start_s
199 "arg_start %lx arg_end %lx env
200 "binfmt %px flags %lx\n"
201 #ifdef CONFIG_AIO
202 "ioctx_table %px\n"
203 #endif
204 #ifdef CONFIG_MEMCG
205 "owner %px "
206 #endif
207 "exe_file %px\n"
208 #ifdef CONFIG_MMU_NOTIFIER
209 "notifier_subscriptions %px\n"
210 #endif
211 #ifdef CONFIG_NUMA_BALANCING
212 "numa_next_scan %lu numa_scan_
213 #endif
214 "tlb_flush_pending %d\n"
215 "def_flags: %#lx(%pGv)\n",
216
217 mm, mm->task_size,
218 mm->mmap_base, mm->mmap_legacy
219 mm->pgd, atomic_read(&mm->mm_u
220 atomic_read(&mm->mm_count),
221 mm_pgtables_bytes(mm),
222 mm->map_count,
223 mm->hiwater_rss, mm->hiwater_v
224 (u64)atomic64_read(&mm->pinned
225 mm->data_vm, mm->exec_vm, mm->
226 mm->start_code, mm->end_code,
227 mm->start_brk, mm->brk, mm->st
228 mm->arg_start, mm->arg_end, mm
229 mm->binfmt, mm->flags,
230 #ifdef CONFIG_AIO
231 mm->ioctx_table,
232 #endif
233 #ifdef CONFIG_MEMCG
234 mm->owner,
235 #endif
236 mm->exe_file,
237 #ifdef CONFIG_MMU_NOTIFIER
238 mm->notifier_subscriptions,
239 #endif
240 #ifdef CONFIG_NUMA_BALANCING
241 mm->numa_next_scan, mm->numa_s
242 #endif
243 atomic_read(&mm->tlb_flush_pen
244 mm->def_flags, &mm->def_flags
245 );
246 }
247 EXPORT_SYMBOL(dump_mm);
248
249 static bool page_init_poisoning __read_mostly
250
251 static int __init setup_vm_debug(char *str)
252 {
253 bool __page_init_poisoning = true;
254
255 /*
256 * Calling vm_debug with no arguments
257 * to enable all debugging options we
258 */
259 if (*str++ != '=' || !*str)
260 goto out;
261
262 __page_init_poisoning = false;
263 if (*str == '-')
264 goto out;
265
266 while (*str) {
267 switch (tolower(*str)) {
268 case'p':
269 __page_init_poisoning
270 break;
271 default:
272 pr_err("vm_debug optio
273 *str);
274 }
275
276 str++;
277 }
278 out:
279 if (page_init_poisoning && !__page_ini
280 pr_warn("Page struct poisoning
281
282 page_init_poisoning = __page_init_pois
283
284 return 1;
285 }
286 __setup("vm_debug", setup_vm_debug);
287
288 void page_init_poison(struct page *page, size_
289 {
290 if (page_init_poisoning)
291 memset(page, PAGE_POISON_PATTE
292 }
293
294 void vma_iter_dump_tree(const struct vma_itera
295 {
296 #if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
297 mas_dump(&vmi->mas);
298 mt_dump(vmi->mas.tree, mt_dump_hex);
299 #endif /* CONFIG_DEBUG_VM_MAPLE_TREE */
300 }
301
302 #endif /* CONFIG_DEBUG_VM */
303
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