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