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         /*
  47          * Avoid VM_BUG_ON() in page_mapcount().
  48          * page->_mapcount space in struct page is used by sl[aou]b pages to
  49          * encode own info.
  50          */
  51         int mapcount = PageSlab(page) ? 0 : page_mapcount(page);
  52
  53         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
  54                   page, page_ref_count(page), mapcount,
  55                   page->mapping, page_to_pgoff(page));
  56         if (PageCompound(page))
  57                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  58         pr_cont("\n");
  59         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
  60
  61         pr_emerg("flags: %#lx(%pGp)\n", page->flags, &page->flags);
  62
  63         print_hex_dump(KERN_ALERT, "raw: ", DUMP_PREFIX_NONE, 32,
  64                         sizeof(unsigned long), page,
  65                         sizeof(struct page), false);
  66
  67         if (reason)
  68                 pr_alert("page dumped because: %s\n", reason);
  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(page, reason);
  79         dump_page_owner(page);
  80 }
  81 EXPORT_SYMBOL(dump_page);
  82
  83 #ifdef CONFIG_DEBUG_VM
  84
  85 void dump_vma(const struct vm_area_struct *vma)
  86 {
  87         pr_emerg("vma %p start %p end %p\n"
  88                 "next %p prev %p mm %p\n"
  89                 "prot %lx anon_vma %p vm_ops %p\n"
  90                 "pgoff %lx file %p private_data %p\n"
  91                 "flags: %#lx(%pGv)\n",
  92                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
  93                 vma->vm_prev, vma->vm_mm,
  94                 (unsigned long)pgprot_val(vma->vm_page_prot),
  95                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
  96                 vma->vm_file, vma->vm_private_data,
  97                 vma->vm_flags, &vma->vm_flags);
  98 }
  99 EXPORT_SYMBOL(dump_vma);
 100
 101 void dump_mm(const struct mm_struct *mm)
 102 {
 103         pr_emerg("mm %p mmap %p seqnum %llu task_size %lu\n"
 104 #ifdef CONFIG_MMU
 105                 "get_unmapped_area %p\n"
 106 #endif
 107                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 108                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 109                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 110                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 111                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 112                 "start_brk %lx brk %lx start_stack %lx\n"
 113                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 114                 "binfmt %p flags %lx core_state %p\n"
 115 #ifdef CONFIG_AIO
 116                 "ioctx_table %p\n"
 117 #endif
 118 #ifdef CONFIG_MEMCG
 119                 "owner %p "
 120 #endif
 121                 "exe_file %p\n"
 122 #ifdef CONFIG_MMU_NOTIFIER
 123                 "mmu_notifier_mm %p\n"
 124 #endif
 125 #ifdef CONFIG_NUMA_BALANCING
 126                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 127 #endif
 128                 "tlb_flush_pending %d\n"
 129                 "def_flags: %#lx(%pGv)\n",
 130
 131                 mm, mm->mmap, (long long) mm->vmacache_seqnum, mm->task_size,
 132 #ifdef CONFIG_MMU
 133                 mm->get_unmapped_area,
 134 #endif
 135                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 136                 mm->pgd, atomic_read(&mm->mm_users),
 137                 atomic_read(&mm->mm_count),
 138                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 139                 mm_nr_pmds((struct mm_struct *)mm),
 140                 mm->map_count,
 141                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 142                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 143                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 144                 mm->start_brk, mm->brk, mm->start_stack,
 145                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 146                 mm->binfmt, mm->flags, mm->core_state,
 147 #ifdef CONFIG_AIO
 148                 mm->ioctx_table,
 149 #endif
 150 #ifdef CONFIG_MEMCG
 151                 mm->owner,
 152 #endif
 153                 mm->exe_file,
 154 #ifdef CONFIG_MMU_NOTIFIER
 155                 mm->mmu_notifier_mm,
 156 #endif
 157 #ifdef CONFIG_NUMA_BALANCING
 158                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 159 #endif
 160                 atomic_read(&mm->tlb_flush_pending),
 161                 mm->def_flags, &mm->def_flags
 162         );
 163 }
 164
 165 #endif          /* CONFIG_DEBUG_VM */