mm/debug.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * mm/debug.c
   4  *
   5  * mm/ specific debug routines.
   6  *
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <linux/trace_events.h>
  12 #include <linux/memcontrol.h>
  13 #include <trace/events/mmflags.h>
  14 #include <linux/migrate.h>
  15 #include <linux/page_owner.h>
  16
  17 #include "internal.h"
  18
  19 char *migrate_reason_names[MR_TYPES] = {
  20         "compaction",
  21         "memory_failure",
  22         "memory_hotplug",
  23         "syscall_or_cpuset",
  24         "mempolicy_mbind",
  25         "numa_misplaced",
  26         "cma",
  27 };
  28
  29 const struct trace_print_flags pageflag_names[] = {
  30         __def_pageflag_names,
  31         {0, NULL}
  32 };
  33
  34 const struct trace_print_flags gfpflag_names[] = {
  35         __def_gfpflag_names,
  36         {0, NULL}
  37 };
  38
  39 const struct trace_print_flags vmaflag_names[] = {
  40         __def_vmaflag_names,
  41         {0, NULL}
  42 };
  43
  44 void __dump_page(struct page *page, const char *reason)
  45 {
  46         bool page_poisoned = PagePoisoned(page);
  47         int mapcount;
  48
  49         /*
  50          * If struct page is poisoned don't access Page*() functions as that
  51          * leads to recursive loop. Page*() check for poisoned pages, and calls
  52          * dump_page() when detected.
  53          */
  54         if (page_poisoned) {
  55                 pr_emerg("page:%px is uninitialized and poisoned", page);
  56                 goto hex_only;
  57         }
  58
  59         /*
  60          * Avoid VM_BUG_ON() in page_mapcount().
  61          * page->_mapcount space in struct page is used by sl[aou]b pages to
  62          * encode own info.
  63          */
  64         mapcount = PageSlab(page) ? 0 : page_mapcount(page);
  65
  66         pr_emerg("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
  67                   page, page_ref_count(page), mapcount,
  68                   page->mapping, page_to_pgoff(page));
  69         if (PageCompound(page))
  70                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  71         pr_cont("\n");
  72         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
  73
  74         pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
  75
  76 hex_only:
  77         print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
  78                         sizeof(unsigned long), page,
  79                         sizeof(struct page), false);
  80
  81         if (reason)
  82                 pr_alert("page dumped because: %s\n", reason);
  83
  84 #ifdef CONFIG_MEMCG
  85         if (!page_poisoned && page->mem_cgroup)
  86                 pr_alert("page->mem_cgroup:%px\n", page->mem_cgroup);
  87 #endif
  88 }
  89
  90 void dump_page(struct page *page, const char *reason)
  91 {
  92         __dump_page(page, reason);
  93         dump_page_owner(page);
  94 }
  95 EXPORT_SYMBOL(dump_page);
  96
  97 #ifdef CONFIG_DEBUG_VM
  98
  99 void dump_vma(const struct vm_area_struct *vma)
 100 {
 101         pr_emerg("vma %px start %px end %px\n"
 102                 "next %px prev %px mm %px\n"
 103                 "prot %lx anon_vma %px vm_ops %px\n"
 104                 "pgoff %lx file %px private_data %px\n"
 105                 "flags: %#lx(%pGv)\n",
 106                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 107                 vma->vm_prev, vma->vm_mm,
 108                 (unsigned long)pgprot_val(vma->vm_page_prot),
 109                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 110                 vma->vm_file, vma->vm_private_data,
 111                 vma->vm_flags, &vma->vm_flags);
 112 }
 113 EXPORT_SYMBOL(dump_vma);
 114
 115 void dump_mm(const struct mm_struct *mm)
 116 {
 117         pr_emerg("mm %px mmap %px seqnum %llu task_size %lu\n"
 118 #ifdef CONFIG_MMU
 119                 "get_unmapped_area %px\n"
 120 #endif
 121                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 122                 "pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
 123                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 124                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 125                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 126                 "start_brk %lx brk %lx start_stack %lx\n"
 127                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 128                 "binfmt %px flags %lx core_state %px\n"
 129 #ifdef CONFIG_AIO
 130                 "ioctx_table %px\n"
 131 #endif
 132 #ifdef CONFIG_MEMCG
 133                 "owner %px "
 134 #endif
 135                 "exe_file %px\n"
 136 #ifdef CONFIG_MMU_NOTIFIER
 137                 "mmu_notifier_mm %px\n"
 138 #endif
 139 #ifdef CONFIG_NUMA_BALANCING
 140                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 141 #endif
 142                 "tlb_flush_pending %d\n"
 143                 "def_flags: %#lx(%pGv)\n",
 144
 145                 mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
 146 #ifdef CONFIG_MMU
 147                 mm->get_unmapped_area,
 148 #endif
 149                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 150                 mm->pgd, atomic_read(&mm->mm_users),
 151                 atomic_read(&mm->mm_count),
 152                 mm_pgtables_bytes(mm),
 153                 mm->map_count,
 154                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 155                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 156                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 157                 mm->start_brk, mm->brk, mm->start_stack,
 158                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 159                 mm->binfmt, mm->flags, mm->core_state,
 160 #ifdef CONFIG_AIO
 161                 mm->ioctx_table,
 162 #endif
 163 #ifdef CONFIG_MEMCG
 164                 mm->owner,
 165 #endif
 166                 mm->exe_file,
 167 #ifdef CONFIG_MMU_NOTIFIER
 168                 mm->mmu_notifier_mm,
 169 #endif
 170 #ifdef CONFIG_NUMA_BALANCING
 171                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 172 #endif
 173                 atomic_read(&mm->tlb_flush_pending),
 174                 mm->def_flags, &mm->def_flags
 175         );
 176 }
 177
 178 #endif          /* CONFIG_DEBUG_VM */