1 // SPDX-License-Identifier: GPL-2.0
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
17 #include "internal.h"
18
19 char *migrate_reason_names[MR_TYPES] = {
20 "compaction",
21 "memory_failure",
22 "memory_hotplug",
23 "syscall_or_cpuset",
24 "mempolicy_mbind",
25 "numa_misplaced",
26 "cma",
27 };
28
29 const struct trace_print_flags pageflag_names[] = {
30 __def_pageflag_names,
31 {0, NULL}
32 };
33
34 const struct trace_print_flags gfpflag_names[] = {
35 __def_gfpflag_names,
36 {0, NULL}
37 };
38
39 const struct trace_print_flags vmaflag_names[] = {
40 __def_vmaflag_names,
41 {0, NULL}
42 };
43
__dump_page(struct page * page,const char * reason)44 void __dump_page(struct page *page, const char *reason)
45 {
46 bool page_poisoned = PagePoisoned(page);
47 int mapcount;
48
49 /*
50 * If struct page is poisoned don't access Page*() functions as that
51 * leads to recursive loop. Page*() check for poisoned pages, and calls
52 * dump_page() when detected.
53 */
54 if (page_poisoned) {
55 pr_emerg("page:%px is uninitialized and poisoned", page);
56 goto hex_only;
57 }
58
59 /*
60 * Avoid VM_BUG_ON() in page_mapcount().
61 * page->_mapcount space in struct page is used by sl[aou]b pages to
62 * encode own info.
63 */
64 mapcount = PageSlab(page) ? 0 : page_mapcount(page);
65
66 pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
67 page, page_ref_count(page), mapcount,
68 page->mapping, page_to_pgoff(page));
69 if (PageCompound(page))
70 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
71 pr_cont("\n");
72 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
73
74 pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
75
76 hex_only:
77 print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
78 sizeof(unsigned long), page,
79 sizeof(struct page), false);
80
81 if (reason)
82 pr_alert("page dumped because: %s\n", reason);
83
84 #ifdef CONFIG_MEMCG
85 if (!page_poisoned && page->mem_cgroup)
86 pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
87 #endif
88 }
89
dump_page(struct page * page,const char * reason)90 void dump_page(struct page *page, const char *reason)
91 {
92 __dump_page(page, reason);
93 dump_page_owner(page);
94 }
95 EXPORT_SYMBOL(dump_page);
96
97 #ifdef CONFIG_DEBUG_VM
98
dump_vma(const struct vm_area_struct * vma)99 void dump_vma(const struct vm_area_struct *vma)
100 {
101 pr_emerg("vma %px start %px end %px\n"
102 "next %px prev %px mm %px\n"
103 "prot %lx anon_vma %px vm_ops %px\n"
104 "pgoff %lx file %px private_data %px\n"
105 "flags: %#lx(%pGv)\n",
106 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
107 vma->vm_prev, vma->vm_mm,
108 (unsigned long)pgprot_val(vma->vm_page_prot),
109 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
110 vma->vm_file, vma->vm_private_data,
111 vma->vm_flags, &vma->vm_flags);
112 }
113 EXPORT_SYMBOL(dump_vma);
114
dump_mm(const struct mm_struct * mm)115 void dump_mm(const struct mm_struct *mm)
116 {
117 pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
118 #ifdef CONFIG_MMU
119 "get_unmapped_area %px\n"
120 #endif
121 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
122 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
123 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
124 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
125 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
126 "start_brk %lx brk %lx start_stack %lx\n"
127 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
128 "binfmt %px flags %lx core_state %px\n"
129 #ifdef CONFIG_AIO
130 "ioctx_table %px\n"
131 #endif
132 #ifdef CONFIG_MEMCG
133 "owner %px "
134 #endif
135 "exe_file %px\n"
136 #ifdef CONFIG_MMU_NOTIFIER
137 "mmu_notifier_mm %px\n"
138 #endif
139 #ifdef CONFIG_NUMA_BALANCING
140 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
141 #endif
142 "tlb_flush_pending %d\n"
143 "def_flags: %#lx(%pGv)\n",
144
145 mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
146 #ifdef CONFIG_MMU
147 mm->get_unmapped_area,
148 #endif
149 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
150 mm->pgd, atomic_read(&mm->mm_users),
151 atomic_read(&mm->mm_count),
152 mm_pgtables_bytes(mm),
153 mm->map_count,
154 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
155 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
156 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
157 mm->start_brk, mm->brk, mm->start_stack,
158 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
159 mm->binfmt, mm->flags, mm->core_state,
160 #ifdef CONFIG_AIO
161 mm->ioctx_table,
162 #endif
163 #ifdef CONFIG_MEMCG
164 mm->owner,
165 #endif
166 mm->exe_file,
167 #ifdef CONFIG_MMU_NOTIFIER
168 mm->mmu_notifier_mm,
169 #endif
170 #ifdef CONFIG_NUMA_BALANCING
171 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
172 #endif
173 atomic_read(&mm->tlb_flush_pending),
174 mm->def_flags, &mm->def_flags
175 );
176 }
177
178 #endif /* CONFIG_DEBUG_VM */
179
