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	/*
 46	 * Avoid VM_BUG_ON() in page_mapcount().
 47	 * page->_mapcount space in struct page is used by sl[aou]b pages to
 48	 * encode own info.
 49	 */
 50	int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
 51
 52	pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
 53		  page, page_ref_count(page), mapcount,
 54		  page->mapping, page_to_pgoff(page));
 55	if (PageCompound(page))
 56		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
 57	pr_cont("\n");
 58	BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
 59
 60	pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
 61
 62	print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
 63			sizeof(unsigned long), page,
 64			sizeof(struct page), false);
 65
 66	if (reason)
 67		pr_alert("page dumped because: %s\n", reason);
 68
 69#ifdef CONFIG_MEMCG
 70	if (page->mem_cgroup)
 71		pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
 72#endif
 73}
 74
 75void dump_page(struct page *page, const char *reason)
 76{
 77	__dump_page(page, reason);
 78	dump_page_owner(page);
 79}
 80EXPORT_SYMBOL(dump_page);
 81
 82#ifdef CONFIG_DEBUG_VM
 83
 84void dump_vma(const struct vm_area_struct *vma)
 85{
 86	pr_emerg("vma %p start %p end %p\n"
 87		"next %p prev %p mm %p\n"
 88		"prot %lx anon_vma %p vm_ops %p\n"
 89		"pgoff %lx file %p private_data %p\n"
 90		"flags: %#lx(%pGv)\n",
 91		vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 92		vma->vm_prev, vma->vm_mm,
 93		(unsigned long)pgprot_val(vma->vm_page_prot),
 94		vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 95		vma->vm_file, vma->vm_private_data,
 96		vma->vm_flags, &vma->vm_flags);
 97}
 98EXPORT_SYMBOL(dump_vma);
 99
100void dump_mm(const struct mm_struct *mm)
101{
102	pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
103#ifdef CONFIG_MMU
104		"get_unmapped_area %p\n"
105#endif
106		"mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
107		"pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
108		"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
109		"pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
110		"start_code %lx end_code %lx start_data %lx end_data %lx\n"
111		"start_brk %lx brk %lx start_stack %lx\n"
112		"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
113		"binfmt %p flags %lx core_state %p\n"
114#ifdef CONFIG_AIO
115		"ioctx_table %p\n"
116#endif
117#ifdef CONFIG_MEMCG
118		"owner %p "
119#endif
120		"exe_file %p\n"
121#ifdef CONFIG_MMU_NOTIFIER
122		"mmu_notifier_mm %p\n"
123#endif
124#ifdef CONFIG_NUMA_BALANCING
125		"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
126#endif
127#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
128		"tlb_flush_pending %d\n"
129#endif
130		"def_flags: %#lx(%pGv)\n",
131
132		mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
133#ifdef CONFIG_MMU
134		mm->get_unmapped_area,
135#endif
136		mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
137		mm->pgd, atomic_read(&mm->mm_users),
138		atomic_read(&mm->mm_count),
139		atomic_long_read((atomic_long_t *)&mm->nr_ptes),
140		mm_nr_pmds((struct mm_struct *)mm),
141		mm->map_count,
142		mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
143		mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
144		mm->start_code, mm->end_code, mm->start_data, mm->end_data,
145		mm->start_brk, mm->brk, mm->start_stack,
146		mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
147		mm->binfmt, mm->flags, mm->core_state,
148#ifdef CONFIG_AIO
149		mm->ioctx_table,
150#endif
151#ifdef CONFIG_MEMCG
152		mm->owner,
153#endif
154		mm->exe_file,
155#ifdef CONFIG_MMU_NOTIFIER
156		mm->mmu_notifier_mm,
157#endif
158#ifdef CONFIG_NUMA_BALANCING
159		mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
160#endif
161#if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
162		mm->tlb_flush_pending,
163#endif
164		mm->def_flags, &mm->def_flags
165	);
166}
167
168#endif		/* CONFIG_DEBUG_VM */