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
  14 static const struct trace_print_flags pageflag_names[] = {
  15         __def_pageflag_names
  16 };
  17
  18 static const struct trace_print_flags gfpflag_names[] = {
  19         __def_gfpflag_names
  20 };
  21
  22 static void dump_flags(unsigned long flags,
  23                         const struct trace_print_flags *names, int count)
  24 {
  25         const char *delim = "";
  26         unsigned long mask;
  27         int i;
  28
  29         pr_emerg("flags: %#lx(", flags);
  30
  31         /* remove zone id */
  32         flags &= (1UL << NR_PAGEFLAGS) - 1;
  33
  34         for (i = 0; i < count && flags; i++) {
  35
  36                 mask = names[i].mask;
  37                 if ((flags & mask) != mask)
  38                         continue;
  39
  40                 flags &= ~mask;
  41                 pr_cont("%s%s", delim, names[i].name);
  42                 delim = "|";
  43         }
  44
  45         /* check for left over flags */
  46         if (flags)
  47                 pr_cont("%s%#lx", delim, flags);
  48
  49         pr_cont(")\n");
  50 }
  51
  52 void dump_page_badflags(struct page *page, const char *reason,
  53                 unsigned long badflags)
  54 {
  55         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
  56                   page, atomic_read(&page->_count), page_mapcount(page),
  57                   page->mapping, page->index);
  58         if (PageCompound(page))
  59                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  60         pr_cont("\n");
  61         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
  62         dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
  63         if (reason)
  64                 pr_alert("page dumped because: %s\n", reason);
  65         if (page->flags & badflags) {
  66                 pr_alert("bad because of flags:\n");
  67                 dump_flags(page->flags & badflags,
  68                                 pageflag_names, ARRAY_SIZE(pageflag_names));
  69         }
  70 #ifdef CONFIG_MEMCG
  71         if (page->mem_cgroup)
  72                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
  73 #endif
  74 }
  75
  76 void dump_page(struct page *page, const char *reason)
  77 {
  78         dump_page_badflags(page, reason, 0);
  79 }
  80 EXPORT_SYMBOL(dump_page);
  81
  82 #ifdef CONFIG_DEBUG_VM
  83
  84 static const struct trace_print_flags vmaflag_names[] = {
  85         __def_vmaflag_names
  86 };
  87
  88 void dump_vma(const struct vm_area_struct *vma)
  89 {
  90         pr_emerg("vma %p start %p end %p\n"
  91                 "next %p prev %p mm %p\n"
  92                 "prot %lx anon_vma %p vm_ops %p\n"
  93                 "pgoff %lx file %p private_data %p\n",
  94                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
  95                 vma->vm_prev, vma->vm_mm,
  96                 (unsigned long)pgprot_val(vma->vm_page_prot),
  97                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
  98                 vma->vm_file, vma->vm_private_data);
  99         dump_flags(vma->vm_flags, vmaflag_names, ARRAY_SIZE(vmaflag_names));
 100 }
 101 EXPORT_SYMBOL(dump_vma);
 102
 103 void dump_mm(const struct mm_struct *mm)
 104 {
 105         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
 106 #ifdef CONFIG_MMU
 107                 "get_unmapped_area %p\n"
 108 #endif
 109                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 110                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 111                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 112                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 113                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 114                 "start_brk %lx brk %lx start_stack %lx\n"
 115                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 116                 "binfmt %p flags %lx core_state %p\n"
 117 #ifdef CONFIG_AIO
 118                 "ioctx_table %p\n"
 119 #endif
 120 #ifdef CONFIG_MEMCG
 121                 "owner %p "
 122 #endif
 123                 "exe_file %p\n"
 124 #ifdef CONFIG_MMU_NOTIFIER
 125                 "mmu_notifier_mm %p\n"
 126 #endif
 127 #ifdef CONFIG_NUMA_BALANCING
 128                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 129 #endif
 130 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 131                 "tlb_flush_pending %d\n"
 132 #endif
 133                 "%s",   /* This is here to hold the comma */
 134
 135                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 136 #ifdef CONFIG_MMU
 137                 mm->get_unmapped_area,
 138 #endif
 139                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 140                 mm->pgd, atomic_read(&mm->mm_users),
 141                 atomic_read(&mm->mm_count),
 142                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 143                 mm_nr_pmds((struct mm_struct *)mm),
 144                 mm->map_count,
 145                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 146                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 147                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 148                 mm->start_brk, mm->brk, mm->start_stack,
 149                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 150                 mm->binfmt, mm->flags, mm->core_state,
 151 #ifdef CONFIG_AIO
 152                 mm->ioctx_table,
 153 #endif
 154 #ifdef CONFIG_MEMCG
 155                 mm->owner,
 156 #endif
 157                 mm->exe_file,
 158 #ifdef CONFIG_MMU_NOTIFIER
 159                 mm->mmu_notifier_mm,
 160 #endif
 161 #ifdef CONFIG_NUMA_BALANCING
 162                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 163 #endif
 164 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 165                 mm->tlb_flush_pending,
 166 #endif
 167                 ""              /* This is here to not have a comma! */
 168                 );
 169
 170                 dump_flags(mm->def_flags, vmaflag_names,
 171                                 ARRAY_SIZE(vmaflag_names));
 172 }
 173
 174 #endif          /* CONFIG_DEBUG_VM */