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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Sasha Levin31c9afa2014-10-09 15:28:37 -07002/*
3 * mm/debug.c
4 *
5 * mm/ specific debug routines.
6 *
7 */
8
Sasha Levin82742a32014-10-09 15:28:34 -07009#include <linux/kernel.h>
10#include <linux/mm.h>
Steven Rostedt (Red Hat)af658dc2015-04-29 14:36:05 -040011#include <linux/trace_events.h>
Sasha Levin82742a32014-10-09 15:28:34 -070012#include <linux/memcontrol.h>
Vlastimil Babka420adbe92016-03-15 14:55:52 -070013#include <trace/events/mmflags.h>
Vlastimil Babka7cd12b42016-03-15 14:56:18 -070014#include <linux/migrate.h>
Vlastimil Babka4e462112016-03-15 14:56:21 -070015#include <linux/page_owner.h>
Sasha Levin82742a32014-10-09 15:28:34 -070016
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070017#include "internal.h"
18
Vlastimil Babka7cd12b42016-03-15 14:56:18 -070019char *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
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070029const struct trace_print_flags pageflag_names[] = {
30 __def_pageflag_names,
31 {0, NULL}
Vlastimil Babka420adbe92016-03-15 14:55:52 -070032};
33
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070034const struct trace_print_flags gfpflag_names[] = {
35 __def_gfpflag_names,
36 {0, NULL}
37};
38
39const struct trace_print_flags vmaflag_names[] = {
40 __def_vmaflag_names,
41 {0, NULL}
Sasha Levin82742a32014-10-09 15:28:34 -070042};
43
Vlastimil Babkaff8e8112016-03-15 14:56:24 -070044void __dump_page(struct page *page, const char *reason)
Sasha Levin82742a32014-10-09 15:28:34 -070045{
Pavel Tatashinfc36def2018-07-03 17:02:53 -070046 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
Kirill A. Shutemov9996f052016-10-07 17:01:40 -070059 /*
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 */
Pavel Tatashinfc36def2018-07-03 17:02:53 -070064 mapcount = PageSlab(page) ? 0 : page_mapcount(page);
Kirill A. Shutemov4d354272016-09-19 14:44:07 -070065
Matthew Wilcox152a2d12018-01-04 16:17:59 -080066 pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
Kirill A. Shutemov4d354272016-09-19 14:44:07 -070067 page, page_ref_count(page), mapcount,
68 page->mapping, page_to_pgoff(page));
Kirill A. Shutemov53f92632016-01-15 16:53:42 -080069 if (PageCompound(page))
70 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
71 pr_cont("\n");
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070072 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
Vlastimil Babkaff8e8112016-03-15 14:56:24 -070073
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -070074 pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
75
Pavel Tatashinfc36def2018-07-03 17:02:53 -070076hex_only:
Vlastimil Babka46e8a3a2016-12-12 16:44:35 -080077 print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
78 sizeof(unsigned long), page,
79 sizeof(struct page), false);
80
Sasha Levin82742a32014-10-09 15:28:34 -070081 if (reason)
82 pr_alert("page dumped because: %s\n", reason);
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -070083
Johannes Weiner9edad6e2014-12-10 15:44:58 -080084#ifdef CONFIG_MEMCG
Pavel Tatashinfc36def2018-07-03 17:02:53 -070085 if (!page_poisoned && page->mem_cgroup)
Matthew Wilcox152a2d12018-01-04 16:17:59 -080086 pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
Johannes Weiner9edad6e2014-12-10 15:44:58 -080087#endif
Sasha Levin82742a32014-10-09 15:28:34 -070088}
89
90void dump_page(struct page *page, const char *reason)
91{
Vlastimil Babkaff8e8112016-03-15 14:56:24 -070092 __dump_page(page, reason);
Vlastimil Babka4e462112016-03-15 14:56:21 -070093 dump_page_owner(page);
Sasha Levin82742a32014-10-09 15:28:34 -070094}
95EXPORT_SYMBOL(dump_page);
96
97#ifdef CONFIG_DEBUG_VM
98
Sasha Levin82742a32014-10-09 15:28:34 -070099void dump_vma(const struct vm_area_struct *vma)
100{
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800101 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"
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700105 "flags: %#lx(%pGv)\n",
Sasha Levin82742a32014-10-09 15:28:34 -0700106 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,
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700110 vma->vm_file, vma->vm_private_data,
111 vma->vm_flags, &vma->vm_flags);
Sasha Levin82742a32014-10-09 15:28:34 -0700112}
113EXPORT_SYMBOL(dump_vma);
114
Sasha Levin31c9afa2014-10-09 15:28:37 -0700115void dump_mm(const struct mm_struct *mm)
116{
Linus Torvalds7a9cdeb2018-09-12 23:57:48 -1000117 pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700118#ifdef CONFIG_MMU
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800119 "get_unmapped_area %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700120#endif
121 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800122 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700123 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
Konstantin Khlebnikov84638332016-01-14 15:22:07 -0800124 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700125 "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"
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800128 "binfmt %px flags %lx core_state %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700129#ifdef CONFIG_AIO
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800130 "ioctx_table %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700131#endif
132#ifdef CONFIG_MEMCG
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800133 "owner %px "
Sasha Levin31c9afa2014-10-09 15:28:37 -0700134#endif
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800135 "exe_file %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700136#ifdef CONFIG_MMU_NOTIFIER
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800137 "mmu_notifier_mm %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700138#endif
139#ifdef CONFIG_NUMA_BALANCING
140 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
141#endif
Sasha Levin31c9afa2014-10-09 15:28:37 -0700142 "tlb_flush_pending %d\n"
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700143 "def_flags: %#lx(%pGv)\n",
Sasha Levin31c9afa2014-10-09 15:28:37 -0700144
Linus Torvalds7a9cdeb2018-09-12 23:57:48 -1000145 mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
Sasha Levin31c9afa2014-10-09 15:28:37 -0700146#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),
Kirill A. Shutemovaf5b0f62017-11-15 17:35:40 -0800152 mm_pgtables_bytes(mm),
Sasha Levin31c9afa2014-10-09 15:28:37 -0700153 mm->map_count,
154 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
Konstantin Khlebnikov84638332016-01-14 15:22:07 -0800155 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
Sasha Levin31c9afa2014-10-09 15:28:37 -0700156 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
Nadav Amit16af97d2017-08-10 15:23:56 -0700173 atomic_read(&mm->tlb_flush_pending),
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700174 mm->def_flags, &mm->def_flags
175 );
Sasha Levin31c9afa2014-10-09 15:28:37 -0700176}
177
Sasha Levin82742a32014-10-09 15:28:34 -0700178#endif /* CONFIG_DEBUG_VM */