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 #ifdef CONFIG_PAGEFLAGS_EXTENDED
  29         {1UL << PG_head,                "head"          },
  30         {1UL << PG_tail,                "tail"          },
  31 #else
  32         {1UL << PG_compound,            "compound"      },
  33 #endif
  34         {1UL << PG_swapcache,           "swapcache"     },
  35         {1UL << PG_mappedtodisk,        "mappedtodisk"  },
  36         {1UL << PG_reclaim,             "reclaim"       },
  37         {1UL << PG_swapbacked,          "swapbacked"    },
  38         {1UL << PG_unevictable,         "unevictable"   },
  39 #ifdef CONFIG_MMU
  40         {1UL << PG_mlocked,             "mlocked"       },
  41 #endif
  42 #ifdef CONFIG_ARCH_USES_PG_UNCACHED
  43         {1UL << PG_uncached,            "uncached"      },
  44 #endif
  45 #ifdef CONFIG_MEMORY_FAILURE
  46         {1UL << PG_hwpoison,            "hwpoison"      },
  47 #endif
  48 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  49         {1UL << PG_compound_lock,       "compound_lock" },
  50 #endif
  51 #if defined(CONFIG_IDLE_PAGE_TRACKING) && defined(CONFIG_64BIT)
  52         {1UL << PG_young,               "young"         },
  53         {1UL << PG_idle,                "idle"          },
  54 #endif
  55 };
  56
  57 static void dump_flags(unsigned long flags,
  58                         const struct trace_print_flags *names, int count)
  59 {
  60         const char *delim = "";
  61         unsigned long mask;
  62         int i;
  63
  64         pr_emerg("flags: %#lx(", flags);
  65
  66         /* remove zone id */
  67         flags &= (1UL << NR_PAGEFLAGS) - 1;
  68
  69         for (i = 0; i < count && flags; i++) {
  70
  71                 mask = names[i].mask;
  72                 if ((flags & mask) != mask)
  73                         continue;
  74
  75                 flags &= ~mask;
  76                 pr_cont("%s%s", delim, names[i].name);
  77                 delim = "|";
  78         }
  79
  80         /* check for left over flags */
  81         if (flags)
  82                 pr_cont("%s%#lx", delim, flags);
  83
  84         pr_cont(")\n");
  85 }
  86
  87 void dump_page_badflags(struct page *page, const char *reason,
  88                 unsigned long badflags)
  89 {
  90         pr_emerg("page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
  91                   page, atomic_read(&page->_count), page_mapcount(page),
  92                   page->mapping, page->index);
  93         BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS);
  94         dump_flags(page->flags, pageflag_names, ARRAY_SIZE(pageflag_names));
  95         if (reason)
  96                 pr_alert("page dumped because: %s\n", reason);
  97         if (page->flags & badflags) {
  98                 pr_alert("bad because of flags:\n");
  99                 dump_flags(page->flags & badflags,
 100                                 pageflag_names, ARRAY_SIZE(pageflag_names));
 101         }
 102 #ifdef CONFIG_MEMCG
 103         if (page->mem_cgroup)
 104                 pr_alert("page->mem_cgroup:%p\n", page->mem_cgroup);
 105 #endif
 106 }
 107
 108 void dump_page(struct page *page, const char *reason)
 109 {
 110         dump_page_badflags(page, reason, 0);
 111 }
 112 EXPORT_SYMBOL(dump_page);
 113
 114 #ifdef CONFIG_DEBUG_VM
 115
 116 static const struct trace_print_flags vmaflags_names[] = {
 117         {VM_READ,                       "read"          },
 118         {VM_WRITE,                      "write"         },
 119         {VM_EXEC,                       "exec"          },
 120         {VM_SHARED,                     "shared"        },
 121         {VM_MAYREAD,                    "mayread"       },
 122         {VM_MAYWRITE,                   "maywrite"      },
 123         {VM_MAYEXEC,                    "mayexec"       },
 124         {VM_MAYSHARE,                   "mayshare"      },
 125         {VM_GROWSDOWN,                  "growsdown"     },
 126         {VM_PFNMAP,                     "pfnmap"        },
 127         {VM_DENYWRITE,                  "denywrite"     },
 128         {VM_LOCKONFAULT,                "lockonfault"   },
 129         {VM_LOCKED,                     "locked"        },
 130         {VM_IO,                         "io"            },
 131         {VM_SEQ_READ,                   "seqread"       },
 132         {VM_RAND_READ,                  "randread"      },
 133         {VM_DONTCOPY,                   "dontcopy"      },
 134         {VM_DONTEXPAND,                 "dontexpand"    },
 135         {VM_ACCOUNT,                    "account"       },
 136         {VM_NORESERVE,                  "noreserve"     },
 137         {VM_HUGETLB,                    "hugetlb"       },
 138 #if defined(CONFIG_X86)
 139         {VM_PAT,                        "pat"           },
 140 #elif defined(CONFIG_PPC)
 141         {VM_SAO,                        "sao"           },
 142 #elif defined(CONFIG_PARISC) || defined(CONFIG_METAG) || defined(CONFIG_IA64)
 143         {VM_GROWSUP,                    "growsup"       },
 144 #elif !defined(CONFIG_MMU)
 145         {VM_MAPPED_COPY,                "mappedcopy"    },
 146 #else
 147         {VM_ARCH_1,                     "arch_1"        },
 148 #endif
 149         {VM_DONTDUMP,                   "dontdump"      },
 150 #ifdef CONFIG_MEM_SOFT_DIRTY
 151         {VM_SOFTDIRTY,                  "softdirty"     },
 152 #endif
 153         {VM_MIXEDMAP,                   "mixedmap"      },
 154         {VM_HUGEPAGE,                   "hugepage"      },
 155         {VM_NOHUGEPAGE,                 "nohugepage"    },
 156         {VM_MERGEABLE,                  "mergeable"     },
 157 };
 158
 159 void dump_vma(const struct vm_area_struct *vma)
 160 {
 161         pr_emerg("vma %p start %p end %p\n"
 162                 "next %p prev %p mm %p\n"
 163                 "prot %lx anon_vma %p vm_ops %p\n"
 164                 "pgoff %lx file %p private_data %p\n",
 165                 vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_next,
 166                 vma->vm_prev, vma->vm_mm,
 167                 (unsigned long)pgprot_val(vma->vm_page_prot),
 168                 vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
 169                 vma->vm_file, vma->vm_private_data);
 170         dump_flags(vma->vm_flags, vmaflags_names, ARRAY_SIZE(vmaflags_names));
 171 }
 172 EXPORT_SYMBOL(dump_vma);
 173
 174 void dump_mm(const struct mm_struct *mm)
 175 {
 176         pr_emerg("mm %p mmap %p seqnum %d task_size %lu\n"
 177 #ifdef CONFIG_MMU
 178                 "get_unmapped_area %p\n"
 179 #endif
 180                 "mmap_base %lu mmap_legacy_base %lu highest_vm_end %lu\n"
 181                 "pgd %p mm_users %d mm_count %d nr_ptes %lu nr_pmds %lu map_count %d\n"
 182                 "hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
 183                 "pinned_vm %lx shared_vm %lx exec_vm %lx stack_vm %lx\n"
 184                 "start_code %lx end_code %lx start_data %lx end_data %lx\n"
 185                 "start_brk %lx brk %lx start_stack %lx\n"
 186                 "arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
 187                 "binfmt %p flags %lx core_state %p\n"
 188 #ifdef CONFIG_AIO
 189                 "ioctx_table %p\n"
 190 #endif
 191 #ifdef CONFIG_MEMCG
 192                 "owner %p "
 193 #endif
 194                 "exe_file %p\n"
 195 #ifdef CONFIG_MMU_NOTIFIER
 196                 "mmu_notifier_mm %p\n"
 197 #endif
 198 #ifdef CONFIG_NUMA_BALANCING
 199                 "numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
 200 #endif
 201 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 202                 "tlb_flush_pending %d\n"
 203 #endif
 204                 "%s",   /* This is here to hold the comma */
 205
 206                 mm, mm->mmap, mm->vmacache_seqnum, mm->task_size,
 207 #ifdef CONFIG_MMU
 208                 mm->get_unmapped_area,
 209 #endif
 210                 mm->mmap_base, mm->mmap_legacy_base, mm->highest_vm_end,
 211                 mm->pgd, atomic_read(&mm->mm_users),
 212                 atomic_read(&mm->mm_count),
 213                 atomic_long_read((atomic_long_t *)&mm->nr_ptes),
 214                 mm_nr_pmds((struct mm_struct *)mm),
 215                 mm->map_count,
 216                 mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
 217                 mm->pinned_vm, mm->shared_vm, mm->exec_vm, mm->stack_vm,
 218                 mm->start_code, mm->end_code, mm->start_data, mm->end_data,
 219                 mm->start_brk, mm->brk, mm->start_stack,
 220                 mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
 221                 mm->binfmt, mm->flags, mm->core_state,
 222 #ifdef CONFIG_AIO
 223                 mm->ioctx_table,
 224 #endif
 225 #ifdef CONFIG_MEMCG
 226                 mm->owner,
 227 #endif
 228                 mm->exe_file,
 229 #ifdef CONFIG_MMU_NOTIFIER
 230                 mm->mmu_notifier_mm,
 231 #endif
 232 #ifdef CONFIG_NUMA_BALANCING
 233                 mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
 234 #endif
 235 #if defined(CONFIG_NUMA_BALANCING) || defined(CONFIG_COMPACTION)
 236                 mm->tlb_flush_pending,
 237 #endif
 238                 ""              /* This is here to not have a comma! */
 239                 );
 240
 241                 dump_flags(mm->def_flags, vmaflags_names,
 242                                 ARRAY_SIZE(vmaflags_names));
 243 }
 244
 245 #endif          /* CONFIG_DEBUG_VM */