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