blob: 7d13941a72f90c0e5a04c37d26f3ddc349507bb8 [file] [log] [blame]
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>
Alexander Duyckf682a972018-10-26 15:07:45 -070016#include <linux/ctype.h>
Sasha Levin82742a32014-10-09 15:28:34 -070017
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070018#include "internal.h"
19
Alexey Dobriyan9a2f45f2018-12-28 00:35:59 -080020const char *migrate_reason_names[MR_TYPES] = {
Vlastimil Babka7cd12b42016-03-15 14:56:18 -070021 "compaction",
22 "memory_failure",
23 "memory_hotplug",
24 "syscall_or_cpuset",
25 "mempolicy_mbind",
26 "numa_misplaced",
27 "cma",
28};
29
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070030const struct trace_print_flags pageflag_names[] = {
31 __def_pageflag_names,
32 {0, NULL}
Vlastimil Babka420adbe92016-03-15 14:55:52 -070033};
34
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070035const struct trace_print_flags gfpflag_names[] = {
36 __def_gfpflag_names,
37 {0, NULL}
38};
39
40const struct trace_print_flags vmaflag_names[] = {
41 __def_vmaflag_names,
42 {0, NULL}
Sasha Levin82742a32014-10-09 15:28:34 -070043};
44
Vlastimil Babkaff8e8112016-03-15 14:56:24 -070045void __dump_page(struct page *page, const char *reason)
Sasha Levin82742a32014-10-09 15:28:34 -070046{
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080047 struct address_space *mapping = page_mapping(page);
Pavel Tatashinfc36def2018-07-03 17:02:53 -070048 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) {
Michal Hockoe0392cf2018-12-28 00:33:42 -080057 pr_warn("page:%px is uninitialized and poisoned", page);
Pavel Tatashinfc36def2018-07-03 17:02:53 -070058 goto hex_only;
59 }
60
Kirill A. Shutemov9996f052016-10-07 17:01:40 -070061 /*
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 */
Pavel Tatashinfc36def2018-07-03 17:02:53 -070066 mapcount = PageSlab(page) ? 0 : page_mapcount(page);
Kirill A. Shutemov4d354272016-09-19 14:44:07 -070067
Michal Hockoe0392cf2018-12-28 00:33:42 -080068 pr_warn("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
Kirill A. Shutemov4d354272016-09-19 14:44:07 -070069 page, page_ref_count(page), mapcount,
70 page->mapping, page_to_pgoff(page));
Kirill A. Shutemov53f92632016-01-15 16:53:42 -080071 if (PageCompound(page))
72 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
73 pr_cont("\n");
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080074 if (PageAnon(page))
Michal Hockoe0392cf2018-12-28 00:33:42 -080075 pr_warn("anon ");
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080076 else if (PageKsm(page))
Michal Hockoe0392cf2018-12-28 00:33:42 -080077 pr_warn("ksm ");
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080078 else if (mapping) {
Michal Hockoe0392cf2018-12-28 00:33:42 -080079 pr_warn("%ps ", mapping->a_ops);
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080080 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);
Michal Hockoe0392cf2018-12-28 00:33:42 -080083 pr_warn("name:\"%pd\" ", dentry);
Michal Hocko1c6fb1d2018-12-28 00:33:38 -080084 }
85 }
Vlastimil Babkaedf14cd2016-03-15 14:55:56 -070086 BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
Vlastimil Babkaff8e8112016-03-15 14:56:24 -070087
Michal Hockoe0392cf2018-12-28 00:33:42 -080088 pr_warn("flags: %#lx(%pGp)\n", page->flags, &page->flags);
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -070089
Pavel Tatashinfc36def2018-07-03 17:02:53 -070090hex_only:
Michal Hockoe0392cf2018-12-28 00:33:42 -080091 print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
Vlastimil Babka46e8a3a2016-12-12 16:44:35 -080092 sizeof(unsigned long), page,
93 sizeof(struct page), false);
94
Sasha Levin82742a32014-10-09 15:28:34 -070095 if (reason)
Michal Hockoe0392cf2018-12-28 00:33:42 -080096 pr_warn("page dumped because: %s\n", reason);
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -070097
Johannes Weiner9edad6e2014-12-10 15:44:58 -080098#ifdef CONFIG_MEMCG
Pavel Tatashinfc36def2018-07-03 17:02:53 -070099 if (!page_poisoned && page->mem_cgroup)
Michal Hockoe0392cf2018-12-28 00:33:42 -0800100 pr_warn("page->mem_cgroup:%px\n", page->mem_cgroup);
Johannes Weiner9edad6e2014-12-10 15:44:58 -0800101#endif
Sasha Levin82742a32014-10-09 15:28:34 -0700102}
103
104void dump_page(struct page *page, const char *reason)
105{
Vlastimil Babkaff8e8112016-03-15 14:56:24 -0700106 __dump_page(page, reason);
Vlastimil Babka4e462112016-03-15 14:56:21 -0700107 dump_page_owner(page);
Sasha Levin82742a32014-10-09 15:28:34 -0700108}
109EXPORT_SYMBOL(dump_page);
110
111#ifdef CONFIG_DEBUG_VM
112
Sasha Levin82742a32014-10-09 15:28:34 -0700113void dump_vma(const struct vm_area_struct *vma)
114{
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800115 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"
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700119 "flags: %#lx(%pGv)\n",
Sasha Levin82742a32014-10-09 15:28:34 -0700120 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,
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700124 vma->vm_file, vma->vm_private_data,
125 vma->vm_flags, &vma->vm_flags);
Sasha Levin82742a32014-10-09 15:28:34 -0700126}
127EXPORT_SYMBOL(dump_vma);
128
Sasha Levin31c9afa2014-10-09 15:28:37 -0700129void dump_mm(const struct mm_struct *mm)
130{
Linus Torvalds7a9cdeb2018-09-12 23:57:48 -1000131 pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700132#ifdef CONFIG_MMU
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800133 "get_unmapped_area %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700134#endif
135 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800136 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700137 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
Davidlohr Bueso70f8a3c2019-02-06 09:59:15 -0800138 "pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700139 "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"
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800142 "binfmt %px flags %lx core_state %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700143#ifdef CONFIG_AIO
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800144 "ioctx_table %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700145#endif
146#ifdef CONFIG_MEMCG
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800147 "owner %px "
Sasha Levin31c9afa2014-10-09 15:28:37 -0700148#endif
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800149 "exe_file %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700150#ifdef CONFIG_MMU_NOTIFIER
Matthew Wilcox152a2d12018-01-04 16:17:59 -0800151 "mmu_notifier_mm %px\n"
Sasha Levin31c9afa2014-10-09 15:28:37 -0700152#endif
153#ifdef CONFIG_NUMA_BALANCING
154 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
155#endif
Sasha Levin31c9afa2014-10-09 15:28:37 -0700156 "tlb_flush_pending %d\n"
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700157 "def_flags: %#lx(%pGv)\n",
Sasha Levin31c9afa2014-10-09 15:28:37 -0700158
Linus Torvalds7a9cdeb2018-09-12 23:57:48 -1000159 mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
Sasha Levin31c9afa2014-10-09 15:28:37 -0700160#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),
Kirill A. Shutemovaf5b0f62017-11-15 17:35:40 -0800166 mm_pgtables_bytes(mm),
Sasha Levin31c9afa2014-10-09 15:28:37 -0700167 mm->map_count,
168 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
Davidlohr Bueso70f8a3c2019-02-06 09:59:15 -0800169 atomic64_read(&mm->pinned_vm),
170 mm->data_vm, mm->exec_vm, mm->stack_vm,
Sasha Levin31c9afa2014-10-09 15:28:37 -0700171 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
172 mm->start_brk, mm->brk, mm->start_stack,
173 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
174 mm->binfmt, mm->flags, mm->core_state,
175#ifdef CONFIG_AIO
176 mm->ioctx_table,
177#endif
178#ifdef CONFIG_MEMCG
179 mm->owner,
180#endif
181 mm->exe_file,
182#ifdef CONFIG_MMU_NOTIFIER
183 mm->mmu_notifier_mm,
184#endif
185#ifdef CONFIG_NUMA_BALANCING
186 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
187#endif
Nadav Amit16af97d2017-08-10 15:23:56 -0700188 atomic_read(&mm->tlb_flush_pending),
Vlastimil Babkab8eceeb2016-03-15 14:55:59 -0700189 mm->def_flags, &mm->def_flags
190 );
Sasha Levin31c9afa2014-10-09 15:28:37 -0700191}
192
Alexander Duyckf682a972018-10-26 15:07:45 -0700193static bool page_init_poisoning __read_mostly = true;
194
195static int __init setup_vm_debug(char *str)
196{
197 bool __page_init_poisoning = true;
198
199 /*
200 * Calling vm_debug with no arguments is equivalent to requesting
201 * to enable all debugging options we can control.
202 */
203 if (*str++ != '=' || !*str)
204 goto out;
205
206 __page_init_poisoning = false;
207 if (*str == '-')
208 goto out;
209
210 while (*str) {
211 switch (tolower(*str)) {
212 case'p':
213 __page_init_poisoning = true;
214 break;
215 default:
216 pr_err("vm_debug option '%c' unknown. skipped\n",
217 *str);
218 }
219
220 str++;
221 }
222out:
223 if (page_init_poisoning && !__page_init_poisoning)
224 pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
225
226 page_init_poisoning = __page_init_poisoning;
227
228 return 1;
229}
230__setup("vm_debug", setup_vm_debug);
231
232void page_init_poison(struct page *page, size_t size)
233{
234 if (page_init_poisoning)
235 memset(page, PAGE_POISON_PATTERN, size);
236}
237EXPORT_SYMBOL_GPL(page_init_poison);
Sasha Levin82742a32014-10-09 15:28:34 -0700238#endif /* CONFIG_DEBUG_VM */