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
 19char *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
 29const struct trace_print_flags pageflag_names[] = {
 30	__def_pageflag_names,
 31	{0, NULL}
 32};
 33
 34const 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}
 42};
 43
 44void __dump_page(struct page *page, const char *reason)
 45{
 46	/*
 47	 * Avoid VM_BUG_ON() in page_mapcount().
 48	 * page->_mapcount space in struct page is used by sl[aou]b pages to
 49	 * encode own info.
 50	 */
 51	int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
 52
 53	pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
 54		  page, page_ref_count(page), mapcount,
 55		  page->mapping, page_to_pgoff(page));
 56	if (PageCompound(page))
 57		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
 58	pr_cont("\n");
 59	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
 60
 61	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
 62
 63	print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
 64			sizeof(unsigned long), page,
 65			sizeof(struct page), false);
 66
 67	if (reason)
 68		pr_alert("page dumped because: %s\n", reason);
 69
 70#ifdef CONFIG_MEMCG
 71	if (page->mem_cgroup)
 72		pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
 73#endif
 74}
 75
 76void dump_page(struct page *page, const char *reason)
 77{
 78	__dump_page(page, reason);
 79	dump_page_owner(page);
 80}
 81EXPORT_SYMBOL(dump_page);
 82
 83#ifdef CONFIG_DEBUG_VM
 84
 85void dump_vma(const struct vm_area_struct *vma)
 86{
 87	pr_emerg("vma %px start %px end %px\n"
 88		"next %px prev %px mm %px\n"
 89		"prot %lx anon_vma %px vm_ops %px\n"
 90		"pgoff %lx file %px private_data %px\n"
 91		"flags: %#lx(%pGv)\n",
 92		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 93		vma->vm_prev, vma->vm_mm,
 94		(unsigned long)pgprot_val(vma->vm_page_prot),
 95		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 96		vma->vm_file, vma->vm_private_data,
 97		vma->vm_flags, &vma->vm_flags);
 98}
 99EXPORT_SYMBOL(dump_vma);
100
101void dump_mm(const struct mm_struct *mm)
102{
103	pr_emerg("mm %px mmap %px seqnum %d task_size %lu\n"
104#ifdef CONFIG_MMU
105		"get_unmapped_area %px\n"
106#endif
107		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
108		"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
109		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
110		"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
111		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
112		"start_brk %lx brk %lx start_stack %lx\n"
113		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
114		"binfmt %px flags %lx core_state %px\n"
115#ifdef CONFIG_AIO
116		"ioctx_table %px\n"
117#endif
118#ifdef CONFIG_MEMCG
119		"owner %px "
120#endif
121		"exe_file %px\n"
122#ifdef CONFIG_MMU_NOTIFIER
123		"mmu_notifier_mm %px\n"
124#endif
125#ifdef CONFIG_NUMA_BALANCING
126		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
127#endif
128		"tlb_flush_pending %d\n"
129		"def_flags: %#lx(%pGv)\n",
130
131		mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
132#ifdef CONFIG_MMU
133		mm->get_unmapped_area,
134#endif
135		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
136		mm->pgd, atomic_read(&mm->mm_users),
137		atomic_read(&mm->mm_count),
138		mm_pgtables_bytes(mm),
139		mm->map_count,
140		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
141		mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
142		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
143		mm->start_brk, mm->brk, mm->start_stack,
144		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
145		mm->binfmt, mm->flags, mm->core_state,
146#ifdef CONFIG_AIO
147		mm->ioctx_table,
148#endif
149#ifdef CONFIG_MEMCG
150		mm->owner,
151#endif
152		mm->exe_file,
153#ifdef CONFIG_MMU_NOTIFIER
154		mm->mmu_notifier_mm,
155#endif
156#ifdef CONFIG_NUMA_BALANCING
157		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
158#endif
159		atomic_read(&mm->tlb_flush_pending),
160		mm->def_flags, &mm->def_flags
161	);
162}
163
164#endif		/* CONFIG_DEBUG_VM */