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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 VB |
18 | #include "internal.h" |
19 | ||
7cd12b4a VB |
20 | char *migrate_reason_names[MR_TYPES] = { |
21 | "compaction", | |
22 | "memory_failure", | |
23 | "memory_hotplug", | |
24 | "syscall_or_cpuset", | |
25 | "mempolicy_mbind", | |
26 | "numa_misplaced", | |
27 | "cma", | |
28 | }; | |
29 | ||
edf14cdb VB |
30 | const struct trace_print_flags pageflag_names[] = { |
31 | __def_pageflag_names, | |
32 | {0, NULL} | |
33 | }; | |
34 | ||
35 | const struct trace_print_flags gfpflag_names[] = { | |
36 | __def_gfpflag_names, | |
37 | {0, NULL} | |
420adbe9 VB |
38 | }; |
39 | ||
edf14cdb VB |
40 | const struct trace_print_flags vmaflag_names[] = { |
41 | __def_vmaflag_names, | |
42 | {0, NULL} | |
82742a3a SL |
43 | }; |
44 | ||
ff8e8116 | 45 | void __dump_page(struct page *page, const char *reason) |
82742a3a | 46 | { |
1c6fb1d8 | 47 | struct address_space *mapping = page_mapping(page); |
fc36def9 PT |
48 | bool page_poisoned = PagePoisoned(page); |
49 | int mapcount; | |
50 | ||
51 | /* | |
52 | * If struct page is poisoned don't access Page*() functions as that | |
53 | * leads to recursive loop. Page*() check for poisoned pages, and calls | |
54 | * dump_page() when detected. | |
55 | */ | |
56 | if (page_poisoned) { | |
e0392cf7 | 57 | pr_warn("page:%px is uninitialized and poisoned", page); |
fc36def9 PT |
58 | goto hex_only; |
59 | } | |
60 | ||
9996f05e KS |
61 | /* |
62 | * Avoid VM_BUG_ON() in page_mapcount(). | |
63 | * page->_mapcount space in struct page is used by sl[aou]b pages to | |
64 | * encode own info. | |
65 | */ | |
fc36def9 | 66 | mapcount = PageSlab(page) ? 0 : page_mapcount(page); |
4d35427a | 67 | |
e0392cf7 | 68 | pr_warn("page:%px count:%d mapcount:%d mapping:%px index:%#lx", |
4d35427a KS |
69 | page, page_ref_count(page), mapcount, |
70 | page->mapping, page_to_pgoff(page)); | |
53f9263b KS |
71 | if (PageCompound(page)) |
72 | pr_cont(" compound_mapcount: %d", compound_mapcount(page)); | |
73 | pr_cont("\n"); | |
1c6fb1d8 | 74 | if (PageAnon(page)) |
e0392cf7 | 75 | pr_warn("anon "); |
1c6fb1d8 | 76 | else if (PageKsm(page)) |
e0392cf7 | 77 | pr_warn("ksm "); |
1c6fb1d8 | 78 | else if (mapping) { |
e0392cf7 | 79 | pr_warn("%ps ", mapping->a_ops); |
1c6fb1d8 MH |
80 | if (mapping->host->i_dentry.first) { |
81 | struct dentry *dentry; | |
82 | dentry = container_of(mapping->host->i_dentry.first, struct dentry, d_u.d_alias); | |
e0392cf7 | 83 | pr_warn("name:\"%pd\" ", dentry); |
1c6fb1d8 MH |
84 | } |
85 | } | |
edf14cdb | 86 | BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1); |
ff8e8116 | 87 | |
e0392cf7 | 88 | pr_warn("flags: %#lx(%pGp)\n", page->flags, &page->flags); |
b8eceeb9 | 89 | |
fc36def9 | 90 | hex_only: |
e0392cf7 | 91 | print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32, |
46e8a3a0 VB |
92 | sizeof(unsigned long), page, |
93 | sizeof(struct page), false); | |
94 | ||
82742a3a | 95 | if (reason) |
e0392cf7 | 96 | pr_warn("page dumped because: %s\n", reason); |
b8eceeb9 | 97 | |
9edad6ea | 98 | #ifdef CONFIG_MEMCG |
fc36def9 | 99 | if (!page_poisoned && page->mem_cgroup) |
e0392cf7 | 100 | pr_warn("page->mem_cgroup:%px\n", page->mem_cgroup); |
9edad6ea | 101 | #endif |
82742a3a SL |
102 | } |
103 | ||
104 | void dump_page(struct page *page, const char *reason) | |
105 | { | |
ff8e8116 | 106 | __dump_page(page, reason); |
4e462112 | 107 | dump_page_owner(page); |
82742a3a SL |
108 | } |
109 | EXPORT_SYMBOL(dump_page); | |
110 | ||
111 | #ifdef CONFIG_DEBUG_VM | |
112 | ||
82742a3a SL |
113 | void dump_vma(const struct vm_area_struct *vma) |
114 | { | |
152a2d19 MW |
115 | pr_emerg("vma %px start %px end %px\n" |
116 | "next %px prev %px mm %px\n" | |
117 | "prot %lx anon_vma %px vm_ops %px\n" | |
118 | "pgoff %lx file %px private_data %px\n" | |
b8eceeb9 | 119 | "flags: %#lx(%pGv)\n", |
82742a3a SL |
120 | vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next, |
121 | vma->vm_prev, vma->vm_mm, | |
122 | (unsigned long)pgprot_val(vma->vm_page_prot), | |
123 | vma->anon_vma, vma->vm_ops, vma->vm_pgoff, | |
b8eceeb9 VB |
124 | vma->vm_file, vma->vm_private_data, |
125 | vma->vm_flags, &vma->vm_flags); | |
82742a3a SL |
126 | } |
127 | EXPORT_SYMBOL(dump_vma); | |
128 | ||
31c9afa6 SL |
129 | void dump_mm(const struct mm_struct *mm) |
130 | { | |
7a9cdebd | 131 | pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n" |
31c9afa6 | 132 | #ifdef CONFIG_MMU |
152a2d19 | 133 | "get_unmapped_area %px\n" |
31c9afa6 SL |
134 | #endif |
135 | "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n" | |
152a2d19 | 136 | "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n" |
31c9afa6 | 137 | "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n" |
84638335 | 138 | "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n" |
31c9afa6 SL |
139 | "start_code %lx end_code %lx start_data %lx end_data %lx\n" |
140 | "start_brk %lx brk %lx start_stack %lx\n" | |
141 | "arg_start %lx arg_end %lx env_start %lx env_end %lx\n" | |
152a2d19 | 142 | "binfmt %px flags %lx core_state %px\n" |
31c9afa6 | 143 | #ifdef CONFIG_AIO |
152a2d19 | 144 | "ioctx_table %px\n" |
31c9afa6 SL |
145 | #endif |
146 | #ifdef CONFIG_MEMCG | |
152a2d19 | 147 | "owner %px " |
31c9afa6 | 148 | #endif |
152a2d19 | 149 | "exe_file %px\n" |
31c9afa6 | 150 | #ifdef CONFIG_MMU_NOTIFIER |
152a2d19 | 151 | "mmu_notifier_mm %px\n" |
31c9afa6 SL |
152 | #endif |
153 | #ifdef CONFIG_NUMA_BALANCING | |
154 | "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n" | |
155 | #endif | |
31c9afa6 | 156 | "tlb_flush_pending %d\n" |
b8eceeb9 | 157 | "def_flags: %#lx(%pGv)\n", |
31c9afa6 | 158 | |
7a9cdebd | 159 | mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size, |
31c9afa6 SL |
160 | #ifdef CONFIG_MMU |
161 | mm->get_unmapped_area, | |
162 | #endif | |
163 | mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end, | |
164 | mm->pgd, atomic_read(&mm->mm_users), | |
165 | atomic_read(&mm->mm_count), | |
af5b0f6a | 166 | mm_pgtables_bytes(mm), |
31c9afa6 SL |
167 | mm->map_count, |
168 | mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm, | |
84638335 | 169 | mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm, |
31c9afa6 SL |
170 | mm->start_code, mm->end_code, mm->start_data, mm->end_data, |
171 | mm->start_brk, mm->brk, mm->start_stack, | |
172 | mm->arg_start, mm->arg_end, mm->env_start, mm->env_end, | |
173 | mm->binfmt, mm->flags, mm->core_state, | |
174 | #ifdef CONFIG_AIO | |
175 | mm->ioctx_table, | |
176 | #endif | |
177 | #ifdef CONFIG_MEMCG | |
178 | mm->owner, | |
179 | #endif | |
180 | mm->exe_file, | |
181 | #ifdef CONFIG_MMU_NOTIFIER | |
182 | mm->mmu_notifier_mm, | |
183 | #endif | |
184 | #ifdef CONFIG_NUMA_BALANCING | |
185 | mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq, | |
186 | #endif | |
16af97dc | 187 | atomic_read(&mm->tlb_flush_pending), |
b8eceeb9 VB |
188 | mm->def_flags, &mm->def_flags |
189 | ); | |
31c9afa6 SL |
190 | } |
191 | ||
f682a97a AD |
192 | static bool page_init_poisoning __read_mostly = true; |
193 | ||
194 | static int __init setup_vm_debug(char *str) | |
195 | { | |
196 | bool __page_init_poisoning = true; | |
197 | ||
198 | /* | |
199 | * Calling vm_debug with no arguments is equivalent to requesting | |
200 | * to enable all debugging options we can control. | |
201 | */ | |
202 | if (*str++ != '=' || !*str) | |
203 | goto out; | |
204 | ||
205 | __page_init_poisoning = false; | |
206 | if (*str == '-') | |
207 | goto out; | |
208 | ||
209 | while (*str) { | |
210 | switch (tolower(*str)) { | |
211 | case'p': | |
212 | __page_init_poisoning = true; | |
213 | break; | |
214 | default: | |
215 | pr_err("vm_debug option '%c' unknown. skipped\n", | |
216 | *str); | |
217 | } | |
218 | ||
219 | str++; | |
220 | } | |
221 | out: | |
222 | if (page_init_poisoning && !__page_init_poisoning) | |
223 | pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n"); | |
224 | ||
225 | page_init_poisoning = __page_init_poisoning; | |
226 | ||
227 | return 1; | |
228 | } | |
229 | __setup("vm_debug", setup_vm_debug); | |
230 | ||
231 | void page_init_poison(struct page *page, size_t size) | |
232 | { | |
233 | if (page_init_poisoning) | |
234 | memset(page, PAGE_POISON_PATTERN, size); | |
235 | } | |
236 | EXPORT_SYMBOL_GPL(page_init_poison); | |
82742a3a | 237 | #endif /* CONFIG_DEBUG_VM */ |