mm: introduce dump_page() and print symbolic flag names

[safe/jmp/linux-2.6] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 78ce90d..d03c946 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -50,6 +50,7 @@
 #include <linux/kmemleak.h>
 #include <linux/memory.h>
 #include <trace/events/kmem.h>
+#include <linux/ftrace_event.h>
 
 #include <asm/tlbflush.h>
 #include <asm/div64.h>
@@ -288,10 +289,7 @@ static void bad_page(struct page *page)
 
        printk(KERN_ALERT "BUG: Bad page state in process %s  pfn:%05lx\n",
                current->comm, page_to_pfn(page));
-       printk(KERN_ALERT
-               "page:%p flags:%p count:%d mapcount:%d mapping:%p index:%lx\n",
-               page, (void *)page->flags, page_count(page),
-               page_mapcount(page), page->mapping, page->index);
+       dump_page(page);
 
        dump_stack();
 out:
@@ -5183,3 +5181,80 @@ bool is_free_buddy_page(struct page *page)
        return order < MAX_ORDER;
 }
 #endif
+
+static struct trace_print_flags pageflag_names[] = {
+       {1UL << PG_locked,              "locked"        },
+       {1UL << PG_error,               "error"         },
+       {1UL << PG_referenced,          "referenced"    },
+       {1UL << PG_uptodate,            "uptodate"      },
+       {1UL << PG_dirty,               "dirty"         },
+       {1UL << PG_lru,                 "lru"           },
+       {1UL << PG_active,              "active"        },
+       {1UL << PG_slab,                "slab"          },
+       {1UL << PG_owner_priv_1,        "owner_priv_1"  },
+       {1UL << PG_arch_1,              "arch_1"        },
+       {1UL << PG_reserved,            "reserved"      },
+       {1UL << PG_private,             "private"       },
+       {1UL << PG_private_2,           "private_2"     },
+       {1UL << PG_writeback,           "writeback"     },
+#ifdef CONFIG_PAGEFLAGS_EXTENDED
+       {1UL << PG_head,                "head"          },
+       {1UL << PG_tail,                "tail"          },
+#else
+       {1UL << PG_compound,            "compound"      },
+#endif
+       {1UL << PG_swapcache,           "swapcache"     },
+       {1UL << PG_mappedtodisk,        "mappedtodisk"  },
+       {1UL << PG_reclaim,             "reclaim"       },
+       {1UL << PG_buddy,               "buddy"         },
+       {1UL << PG_swapbacked,          "swapbacked"    },
+       {1UL << PG_unevictable,         "unevictable"   },
+#ifdef CONFIG_MMU
+       {1UL << PG_mlocked,             "mlocked"       },
+#endif
+#ifdef CONFIG_ARCH_USES_PG_UNCACHED
+       {1UL << PG_uncached,            "uncached"      },
+#endif
+#ifdef CONFIG_MEMORY_FAILURE
+       {1UL << PG_hwpoison,            "hwpoison"      },
+#endif
+       {-1UL,                          NULL            },
+};
+
+static void dump_page_flags(unsigned long flags)
+{
+       const char *delim = "";
+       unsigned long mask;
+       int i;
+
+       printk(KERN_ALERT "page flags: %#lx(", flags);
+
+       /* remove zone id */
+       flags &= (1UL << NR_PAGEFLAGS) - 1;
+
+       for (i = 0; pageflag_names[i].name && flags; i++) {
+
+               mask = pageflag_names[i].mask;
+               if ((flags & mask) != mask)
+                       continue;
+
+               flags &= ~mask;
+               printk("%s%s", delim, pageflag_names[i].name);
+               delim = "|";
+       }
+
+       /* check for left over flags */
+       if (flags)
+               printk("%s%#lx", delim, flags);
+
+       printk(")\n");
+}
+
+void dump_page(struct page *page)
+{
+       printk(KERN_ALERT
+              "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
+               page, page_count(page), page_mapcount(page),
+               page->mapping, page->index);
+       dump_page_flags(page->flags);
+}