1/*
  2 * mm/debug.c
  3 *
  4 * mm/ specific debug routines.
  5 *
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/mm.h>
 10#include <linux/trace_events.h>
 11#include <linux/memcontrol.h>
 12#include <trace/events/mmflags.h>
 13#include <linux/migrate.h>
 14#include <linux/page_owner.h>
 15
 16#include "internal.h"
 17
 18char *migrate_reason_names[MR_TYPES] = {
 19	"compaction",
 20	"memory_failure",
 21	"memory_hotplug",
 22	"syscall_or_cpuset",
 23	"mempolicy_mbind",
 24	"numa_misplaced",
 25	"cma",
 26};
 27
 28const struct trace_print_flags pageflag_names[] = {
 29	__def_pageflag_names,
 30	{0, NULL}
 31};
 32
 33const struct trace_print_flags gfpflag_names[] = {
 34	__def_gfpflag_names,
 35	{0, NULL}
 36};
 37
 38const struct trace_print_flags vmaflag_names[] = {
 39	__def_vmaflag_names,
 40	{0, NULL}
 41};
 42
 43void __dump_page(struct page *page, const char *reason)
 44{
 45	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
 46		  page, page_ref_count(page), page_mapcount(page),
 47		  page->mapping, page->index);
 48	if (PageCompound(page))
 49		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
 50	pr_cont("\n");
 51	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
 52
 53	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
 54
 55	if (reason)
 56		pr_alert("page dumped because: %s\n", reason);
 57
 58#ifdef CONFIG_MEMCG
 59	if (page->mem_cgroup)
 60		pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
 61#endif
 62}
 63
 64void dump_page(struct page *page, const char *reason)
 65{
 66	__dump_page(page, reason);
 67	dump_page_owner(page);
 68}
 69EXPORT_SYMBOL(dump_page);
 70
 71#ifdef CONFIG_DEBUG_VM
 72
 73void dump_vma(const struct vm_area_struct *vma)
 74{
 75	pr_emerg("vma %p start %p end %p\n"
 76		"next %p prev %p mm %p\n"
 77		"prot %lx anon_vma %p vm_ops %p\n"
 78		"pgoff %lx file %p private_data %p\n"
 79		"flags: %#lx(%pGv)\n",
 80		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 81		vma->vm_prev, vma->vm_mm,
 82		(unsigned long)pgprot_val(vma->vm_page_prot),
 83		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 84		vma->vm_file, vma->vm_private_data,
 85		vma->vm_flags, &vma->vm_flags);
 86}
 87EXPORT_SYMBOL(dump_vma);
 88
 89void dump_mm(const struct mm_struct *mm)
 90{
 91	pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
 92#ifdef CONFIG_MMU
 93		"get_unmapped_area %p\n"
 94#endif
 95		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 96		"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 97		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 98		"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 99		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
100		"start_brk %lx brk %lx start_stack %lx\n"
101		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
102		"binfmt %p flags %lx core_state %p\n"
103#ifdef CONFIG_AIO
104		"ioctx_table %p\n"
105#endif
106#ifdef CONFIG_MEMCG
107		"owner %p "
108#endif
109		"exe_file %p\n"
110#ifdef CONFIG_MMU_NOTIFIER
111		"mmu_notifier_mm %p\n"
112#endif
113#ifdef CONFIG_NUMA_BALANCING
114		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
115#endif
116#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
117		"tlb_flush_pending %d\n"
118#endif
119		"def_flags: %#lx(%pGv)\n",
120
121		mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
122#ifdef CONFIG_MMU
123		mm->get_unmapped_area,
124#endif
125		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
126		mm->pgd, atomic_read(&mm->mm_users),
127		atomic_read(&mm->mm_count),
128		atomic_long_read((atomic_long_t *)&mm->nr_ptes),
129		mm_nr_pmds((struct mm_struct *)mm),
130		mm->map_count,
131		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
132		mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
133		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
134		mm->start_brk, mm->brk, mm->start_stack,
135		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
136		mm->binfmt, mm->flags, mm->core_state,
137#ifdef CONFIG_AIO
138		mm->ioctx_table,
139#endif
140#ifdef CONFIG_MEMCG
141		mm->owner,
142#endif
143		mm->exe_file,
144#ifdef CONFIG_MMU_NOTIFIER
145		mm->mmu_notifier_mm,
146#endif
147#ifdef CONFIG_NUMA_BALANCING
148		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
149#endif
150#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
151		mm->tlb_flush_pending,
152#endif
153		mm->def_flags, &mm->def_flags
154	);
155}
156
157#endif		/* CONFIG_DEBUG_VM */