LXR linux/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
  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 */
 169