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 #include "internal.h"
  15
  16 const struct trace_print_flags pageflag_names[] = {
  17         __def_pageflag_names,
  18         {0, NULL}
  19 };
  20
  21 const struct trace_print_flags gfpflag_names[] = {
  22         __def_gfpflag_names,
  23         {0, NULL}
  24 };
  25
  26 const struct trace_print_flags vmaflag_names[] = {
  27         __def_vmaflag_names,
  28         {0, NULL}
  29 };
  30
  31 static void dump_flags(unsigned long flags,
  32                         const struct trace_print_flags *names, int count)
  33 {
  34         const char *delim = "";
  35         unsigned long mask;
  36         int i;
  37
  38         pr_emerg("flags: %#lx(", flags);
  39
  40         /* remove zone id */
  41         flags &= (1UL << NR_PAGEFLAGS) - 1;
  42
  43         for (i = 0; i < count && flags; i++) {
  44
  45                 mask = names[i].mask;
  46                 if ((flags & mask) != mask)
  47                         continue;
  48
  49                 flags &= ~mask;
  50                 pr_cont("%s%s", delim, names[i].name);
  51                 delim = "|";
  52         }
  53
  54         /* check for left over flags */
  55         if (flags)
  56                 pr_cont("%s%#lx", delim, flags);
  57
  58         pr_cont(")\n");
  59 }
  60
  61 void dump_page_badflags(struct page *page, const char *reason,
  62                 unsigned long badflags)
  63 {
  64         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
  65                   page, atomic_read(&page->_count), page_mapcount(page),
  66                   page->mapping, page->index);
  67         if (PageCompound(page))
  68                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  69         pr_cont("\n");
  70         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
  71         dump_flags(page->flags, pageflag_names,
  72                                         ARRAY_SIZE(pageflag_names) - 1);
  73         if (reason)
  74                 pr_alert("page dumped because: %s\n", reason);
  75         if (page->flags & badflags) {
  76                 pr_alert("bad because of flags:\n");
  77                 dump_flags(page->flags & badflags, pageflag_names,
  78                                         ARRAY_SIZE(pageflag_names) - 1);
  79         }
  80 #ifdef CONFIG_MEMCG
  81         if (page->mem_cgroup)
  82                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
  83 #endif
  84 }
  85
  86 void dump_page(struct page *page, const char *reason)
  87 {
  88         dump_page_badflags(page, reason, 0);
  89 }
  90 EXPORT_SYMBOL(dump_page);
  91
  92 #ifdef CONFIG_DEBUG_VM
  93
  94 void dump_vma(const struct vm_area_struct *vma)
  95 {
  96         pr_emerg("vma %p start %p end %p\n"
  97                 "next %p prev %p mm %p\n"
  98                 "prot %lx anon_vma %p vm_ops %p\n"
  99                 "pgoff %lx file %p private_data %p\n",
 100                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 101                 vma->vm_prev, vma->vm_mm,
 102                 (unsigned long)pgprot_val(vma->vm_page_prot),
 103                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 104                 vma->vm_file, vma->vm_private_data);
 105         dump_flags(vma->vm_flags, vmaflag_names, ARRAY_SIZE(vmaflag_names) - 1);
 106 }
 107 EXPORT_SYMBOL(dump_vma);
 108
 109 void dump_mm(const struct mm_struct *mm)
 110 {
 111         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
 112 #ifdef CONFIG_MMU
 113                 "get_unmapped_area %p\n"
 114 #endif
 115                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 116                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 117                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 118                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 119                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 120                 "start_brk %lx brk %lx start_stack %lx\n"
 121                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 122                 "binfmt %p flags %lx core_state %p\n"
 123 #ifdef CONFIG_AIO
 124                 "ioctx_table %p\n"
 125 #endif
 126 #ifdef CONFIG_MEMCG
 127                 "owner %p "
 128 #endif
 129                 "exe_file %p\n"
 130 #ifdef CONFIG_MMU_NOTIFIER
 131                 "mmu_notifier_mm %p\n"
 132 #endif
 133 #ifdef CONFIG_NUMA_BALANCING
 134                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 135 #endif
 136 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 137                 "tlb_flush_pending %d\n"
 138 #endif
 139                 "%s",   /* This is here to hold the comma */
 140
 141                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 142 #ifdef CONFIG_MMU
 143                 mm->get_unmapped_area,
 144 #endif
 145                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 146                 mm->pgd, atomic_read(&mm->mm_users),
 147                 atomic_read(&mm->mm_count),
 148                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 149                 mm_nr_pmds((struct mm_struct *)mm),
 150                 mm->map_count,
 151                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 152                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 153                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 154                 mm->start_brk, mm->brk, mm->start_stack,
 155                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 156                 mm->binfmt, mm->flags, mm->core_state,
 157 #ifdef CONFIG_AIO
 158                 mm->ioctx_table,
 159 #endif
 160 #ifdef CONFIG_MEMCG
 161                 mm->owner,
 162 #endif
 163                 mm->exe_file,
 164 #ifdef CONFIG_MMU_NOTIFIER
 165                 mm->mmu_notifier_mm,
 166 #endif
 167 #ifdef CONFIG_NUMA_BALANCING
 168                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 169 #endif
 170 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 171                 mm->tlb_flush_pending,
 172 #endif
 173                 ""              /* This is here to not have a comma! */
 174                 );
 175
 176                 dump_flags(mm->def_flags, vmaflag_names,
 177                                 ARRAY_SIZE(vmaflag_names) - 1);
 178 }
 179
 180 #endif          /* CONFIG_DEBUG_VM */