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
  13 static const struct trace_print_flags pageflag_names[] = {
  14         {1UL << PG_locked,              "locked"        },
  15         {1UL << PG_error,               "error"         },
  16         {1UL << PG_referenced,          "referenced"    },
  17         {1UL << PG_uptodate,            "uptodate"      },
  18         {1UL << PG_dirty,               "dirty"         },
  19         {1UL << PG_lru,                 "lru"           },
  20         {1UL << PG_active,              "active"        },
  21         {1UL << PG_slab,                "slab"          },
  22         {1UL << PG_owner_priv_1,        "owner_priv_1"  },
  23         {1UL << PG_arch_1,              "arch_1"        },
  24         {1UL << PG_reserved,            "reserved"      },
  25         {1UL << PG_private,             "private"       },
  26         {1UL << PG_private_2,           "private_2"     },
  27         {1UL << PG_writeback,           "writeback"     },
  28         {1UL << PG_head,                "head"          },
  29         {1UL << PG_swapcache,           "swapcache"     },
  30         {1UL << PG_mappedtodisk,        "mappedtodisk"  },
  31         {1UL << PG_reclaim,             "reclaim"       },
  32         {1UL << PG_swapbacked,          "swapbacked"    },
  33         {1UL << PG_unevictable,         "unevictable"   },
  34 #ifdef CONFIG_MMU
  35         {1UL << PG_mlocked,             "mlocked"       },
  36 #endif
  37 #ifdef CONFIG_ARCH_USES_PG_UNCACHED
  38         {1UL << PG_uncached,            "uncached"      },
  39 #endif
  40 #ifdef CONFIG_MEMORY_FAILURE
  41         {1UL << PG_hwpoison,            "hwpoison"      },
  42 #endif
  43 #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
  44         {1UL << PG_young,               "young"         },
  45         {1UL << PG_idle,                "idle"          },
  46 #endif
  47 };
  48
  49 static void dump_flags(unsigned long flags,
  50                         const struct trace_print_flags *names, int count)
  51 {
  52         const char *delim = "";
  53         unsigned long mask;
  54         int i;
  55
  56         pr_emerg("flags: %#lx(", flags);
  57
  58         /* remove zone id */
  59         flags &= (1UL << NR_PAGEFLAGS) - 1;
  60
  61         for (i = 0; i < count && flags; i++) {
  62
  63                 mask = names[i].mask;
  64                 if ((flags & mask) != mask)
  65                         continue;
  66
  67                 flags &= ~mask;
  68                 pr_cont("%s%s", delim, names[i].name);
  69                 delim = "|";
  70         }
  71
  72         /* check for left over flags */
  73         if (flags)
  74                 pr_cont("%s%#lx", delim, flags);
  75
  76         pr_cont(")\n");
  77 }
  78
  79 void dump_page_badflags(struct page *page, const char *reason,
  80                 unsigned long badflags)
  81 {
  82         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx",
  83                   page, atomic_read(&page->_count), page_mapcount(page),
  84                   page->mapping, page->index);
  85         if (PageCompound(page))
  86                 pr_cont(" compound_mapcount: %d", compound_mapcount(page));
  87         pr_cont("\n");
  88         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
  89         dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
  90         if (reason)
  91                 pr_alert("page dumped because: %s\n", reason);
  92         if (page->flags & badflags) {
  93                 pr_alert("bad because of flags:\n");
  94                 dump_flags(page->flags & badflags,
  95                                 pageflag_names, ARRAY_SIZE(pageflag_names));
  96         }
  97 #ifdef CONFIG_MEMCG
  98         if (page->mem_cgroup)
  99                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
 100 #endif
 101 }
 102
 103 void dump_page(struct page *page, const char *reason)
 104 {
 105         dump_page_badflags(page, reason, 0);
 106 }
 107 EXPORT_SYMBOL(dump_page);
 108
 109 #ifdef CONFIG_DEBUG_VM
 110
 111 static const struct trace_print_flags vmaflags_names[] = {
 112         {VM_READ,                       "read"          },
 113         {VM_WRITE,                      "write"         },
 114         {VM_EXEC,                       "exec"          },
 115         {VM_SHARED,                     "shared"        },
 116         {VM_MAYREAD,                    "mayread"       },
 117         {VM_MAYWRITE,                   "maywrite"      },
 118         {VM_MAYEXEC,                    "mayexec"       },
 119         {VM_MAYSHARE,                   "mayshare"      },
 120         {VM_GROWSDOWN,                  "growsdown"     },
 121         {VM_PFNMAP,                     "pfnmap"        },
 122         {VM_DENYWRITE,                  "denywrite"     },
 123         {VM_LOCKONFAULT,                "lockonfault"   },
 124         {VM_LOCKED,                     "locked"        },
 125         {VM_IO,                         "io"            },
 126         {VM_SEQ_READ,                   "seqread"       },
 127         {VM_RAND_READ,                  "randread"      },
 128         {VM_DONTCOPY,                   "dontcopy"      },
 129         {VM_DONTEXPAND,                 "dontexpand"    },
 130         {VM_ACCOUNT,                    "account"       },
 131         {VM_NORESERVE,                  "noreserve"     },
 132         {VM_HUGETLB,                    "hugetlb"       },
 133 #if defined(CONFIG_X86)
 134         {VM_PAT,                        "pat"           },
 135 #elif defined(CONFIG_PPC)
 136         {VM_SAO,                        "sao"           },
 137 #elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
 138         {VM_GROWSUP,                    "growsup"       },
 139 #elif !defined(CONFIG_MMU)
 140         {VM_MAPPED_COPY,                "mappedcopy"    },
 141 #else
 142         {VM_ARCH_1,                     "arch_1"        },
 143 #endif
 144         {VM_DONTDUMP,                   "dontdump"      },
 145 #ifdef CONFIG_MEM_SOFT_DIRTY
 146         {VM_SOFTDIRTY,                  "softdirty"     },
 147 #endif
 148         {VM_MIXEDMAP,                   "mixedmap"      },
 149         {VM_HUGEPAGE,                   "hugepage"      },
 150         {VM_NOHUGEPAGE,                 "nohugepage"    },
 151         {VM_MERGEABLE,                  "mergeable"     },
 152 };
 153
 154 void dump_vma(const struct vm_area_struct *vma)
 155 {
 156         pr_emerg("vma %p start %p end %p\n"
 157                 "next %p prev %p mm %p\n"
 158                 "prot %lx anon_vma %p vm_ops %p\n"
 159                 "pgoff %lx file %p private_data %p\n",
 160                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 161                 vma->vm_prev, vma->vm_mm,
 162                 (unsigned long)pgprot_val(vma->vm_page_prot),
 163                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 164                 vma->vm_file, vma->vm_private_data);
 165         dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
 166 }
 167 EXPORT_SYMBOL(dump_vma);
 168
 169 void dump_mm(const struct mm_struct *mm)
 170 {
 171         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
 172 #ifdef CONFIG_MMU
 173                 "get_unmapped_area %p\n"
 174 #endif
 175                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 176                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 177                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 178                 "pinned_vm %lx data_vm %lx exec_vm %lx stack_vm %lx\n"
 179                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 180                 "start_brk %lx brk %lx start_stack %lx\n"
 181                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 182                 "binfmt %p flags %lx core_state %p\n"
 183 #ifdef CONFIG_AIO
 184                 "ioctx_table %p\n"
 185 #endif
 186 #ifdef CONFIG_MEMCG
 187                 "owner %p "
 188 #endif
 189                 "exe_file %p\n"
 190 #ifdef CONFIG_MMU_NOTIFIER
 191                 "mmu_notifier_mm %p\n"
 192 #endif
 193 #ifdef CONFIG_NUMA_BALANCING
 194                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 195 #endif
 196 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 197                 "tlb_flush_pending %d\n"
 198 #endif
 199                 "%s",   /* This is here to hold the comma */
 200
 201                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 202 #ifdef CONFIG_MMU
 203                 mm->get_unmapped_area,
 204 #endif
 205                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 206                 mm->pgd, atomic_read(&mm->mm_users),
 207                 atomic_read(&mm->mm_count),
 208                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 209                 mm_nr_pmds((struct mm_struct *)mm),
 210                 mm->map_count,
 211                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 212                 mm->pinned_vm, mm->data_vm, mm->exec_vm, mm->stack_vm,
 213                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 214                 mm->start_brk, mm->brk, mm->start_stack,
 215                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 216                 mm->binfmt, mm->flags, mm->core_state,
 217 #ifdef CONFIG_AIO
 218                 mm->ioctx_table,
 219 #endif
 220 #ifdef CONFIG_MEMCG
 221                 mm->owner,
 222 #endif
 223                 mm->exe_file,
 224 #ifdef CONFIG_MMU_NOTIFIER
 225                 mm->mmu_notifier_mm,
 226 #endif
 227 #ifdef CONFIG_NUMA_BALANCING
 228                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 229 #endif
 230 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 231                 mm->tlb_flush_pending,
 232 #endif
 233                 ""              /* This is here to not have a comma! */
 234                 );
 235
 236                 dump_flags(mm->def_flags, vmaflags_names,
 237                                 ARRAY_SIZE(vmaflags_names));
 238 }
 239
 240 #endif          /* CONFIG_DEBUG_VM */