mm/debug.c

   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
  18 char *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
  28 const struct trace_print_flags pageflag_names[] = {
  29         __def_pageflag_names,
  30         {0, NULL}
  31 };
  32
  33 const struct trace_print_flags gfpflag_names[] = {
  34         __def_gfpflag_names,
  35         {0, NULL}
  36 };
  37
  38 const struct trace_print_flags vmaflag_names[] = {
  39         __def_vmaflag_names,
  40         {0, NULL}
  41 };
  42
  43 void __dump_page(struct page *page, const char *reason)
  44 {
  45         int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
  46
  47         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
  48                   page, page_ref_count(page), mapcount,
  49                   page->mapping, page_to_pgoff(page));
  50         if (PageCompound(page))
  51                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  52         pr_cont("\n");
  53         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
  54
  55         pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
  56
  57         if (reason)
  58                 pr_alert("page dumped because: %s\n", reason);
  59
  60 #ifdef CONFIG_MEMCG
  61         if (page->mem_cgroup)
  62                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
  63 #endif
  64 }
  65
  66 void dump_page(struct page *page, const char *reason)
  67 {
  68         __dump_page(page, reason);
  69         dump_page_owner(page);
  70 }
  71 EXPORT_SYMBOL(dump_page);
  72
  73 #ifdef CONFIG_DEBUG_VM
  74
  75 void dump_vma(const struct vm_area_struct *vma)
  76 {
  77         pr_emerg("vma %p start %p end %p\n"
  78                 "next %p prev %p mm %p\n"
  79                 "prot %lx anon_vma %p vm_ops %p\n"
  80                 "pgoff %lx file %p private_data %p\n"
  81                 "flags: %#lx(%pGv)\n",
  82                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
  83                 vma->vm_prev, vma->vm_mm,
  84                 (unsigned long)pgprot_val(vma->vm_page_prot),
  85                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
  86                 vma->vm_file, vma->vm_private_data,
  87                 vma->vm_flags, &vma->vm_flags);
  88 }
  89 EXPORT_SYMBOL(dump_vma);
  90
  91 void dump_mm(const struct mm_struct *mm)
  92 {
  93         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
  94 #ifdef CONFIG_MMU
  95                 "get_unmapped_area %p\n"
  96 #endif
  97                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
  98                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
  99                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 100                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 101                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 102                 "start_brk %lx brk %lx start_stack %lx\n"
 103                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 104                 "binfmt %p flags %lx core_state %p\n"
 105 #ifdef CONFIG_AIO
 106                 "ioctx_table %p\n"
 107 #endif
 108 #ifdef CONFIG_MEMCG
 109                 "owner %p "
 110 #endif
 111                 "exe_file %p\n"
 112 #ifdef CONFIG_MMU_NOTIFIER
 113                 "mmu_notifier_mm %p\n"
 114 #endif
 115 #ifdef CONFIG_NUMA_BALANCING
 116                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 117 #endif
 118 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 119                 "tlb_flush_pending %d\n"
 120 #endif
 121                 "def_flags: %#lx(%pGv)\n",
 122
 123                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 124 #ifdef CONFIG_MMU
 125                 mm->get_unmapped_area,
 126 #endif
 127                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 128                 mm->pgd, atomic_read(&mm->mm_users),
 129                 atomic_read(&mm->mm_count),
 130                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 131                 mm_nr_pmds((struct mm_struct *)mm),
 132                 mm->map_count,
 133                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 134                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 135                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 136                 mm->start_brk, mm->brk, mm->start_stack,
 137                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 138                 mm->binfmt, mm->flags, mm->core_state,
 139 #ifdef CONFIG_AIO
 140                 mm->ioctx_table,
 141 #endif
 142 #ifdef CONFIG_MEMCG
 143                 mm->owner,
 144 #endif
 145                 mm->exe_file,
 146 #ifdef CONFIG_MMU_NOTIFIER
 147                 mm->mmu_notifier_mm,
 148 #endif
 149 #ifdef CONFIG_NUMA_BALANCING
 150                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 151 #endif
 152 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 153                 mm->tlb_flush_pending,
 154 #endif
 155                 mm->def_flags, &mm->def_flags
 156         );
 157 }
 158
 159 #endif          /* CONFIG_DEBUG_VM */