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Date: Fri, 18 Dec 2009 10:11:45 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Americo Wang <xiyou.wangcong@...il.com>,
Mel Gorman <mel@....ul.ie>, Alex Chiang <achiang@...com>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
"Li, Haicheng" <haicheng.li@...el.com>,
Randy Dunlap <randy.dunlap@...cle.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
Christoph Lameter <cl@...ux-foundation.org>,
Rik van Riel <riel@...hat.com>
Subject: [PATCH v3] mm: introduce dump_page() and print symbolic flag names
On Fri, Dec 18, 2009 at 09:35:59AM +0800, KOSAKI Motohiro wrote:
> > On Wed, Dec 16, 2009 at 11:35:13PM +0800, Américo Wang wrote:
> > > On Wed, Dec 16, 2009 at 08:33:10PM +0800, Wu Fengguang wrote:
> > > >On Wed, Dec 16, 2009 at 08:26:40PM +0800, Wu Fengguang wrote:
> > > >> - introduce dump_page() to print the page info for debugging some error condition.
> > > >> - convert three mm users: bad_page(), print_bad_pte() and memory offline failure.
> > > >> - print an extra field: the symbolic names of page->flags
> > > >>
> > > >> Example dump_page() output:
> > > >>
> > > >> [ 157.521694] page:ffffea0000a7cba8 count:2 mapcount:1
> > > >> mapping:ffff88001c901791 index:147
> > > > ~~~ this is in fact 0x147
> > > >
> > > >The index value may sometimes be misread as decimal number, shall this
> > > >be fixed by adding a "0x" prefix?
> > >
> > >
> > > Using '%#x' will do.
> >
> > + printk(KERN_ALERT "page flags: %lx(", flags);
>
> nit.
> Now, you append 0x prefix to index. why don't you appent 0x prefix to this?
> I mean we have to keep consist prefix printing rule in the same printk.
Good suggestion, thanks!
---
mm: introduce dump_page()
- introduce dump_page() to print the page info for debugging some error condition.
- convert three mm users: bad_page(), print_bad_pte() and memory offline failure.
- print an extra field: the symbolic names of page->flags
Example dump_page() output:
[ 157.521694] page:ffffea0000a7cba8 count:2 mapcount:1 mapping:ffff88001c901791 index:0x147
[ 157.525570] page flags: 0x100000000100068(uptodate|lru|active|swapbacked)
CC: Ingo Molnar <mingo@...e.hu>
CC: Alex Chiang <achiang@...com>
CC: Rik van Riel <riel@...hat.com>
CC: Andi Kleen <andi@...stfloor.org>
CC: Mel Gorman <mel@...ux.vnet.ibm.com>
CC: Christoph Lameter <cl@...ux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
include/linux/mm.h | 2 +
mm/memory.c | 8 +---
mm/memory_hotplug.c | 6 +--
mm/page_alloc.c | 83 +++++++++++++++++++++++++++++++++++++++---
4 files changed, 86 insertions(+), 13 deletions(-)
--- linux-mm.orig/mm/page_alloc.c 2009-12-11 10:01:25.000000000 +0800
+++ linux-mm/mm/page_alloc.c 2009-12-18 10:08:24.000000000 +0800
@@ -49,6 +49,7 @@
#include <linux/debugobjects.h>
#include <linux/kmemleak.h>
#include <trace/events/kmem.h>
+#include <linux/ftrace_event.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -262,10 +263,7 @@ 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:
@@ -5106,3 +5104,80 @@ bool is_free_buddy_page(struct page *pag
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);
+}
--- linux-mm.orig/mm/memory.c 2009-12-11 10:01:25.000000000 +0800
+++ linux-mm/mm/memory.c 2009-12-14 19:21:22.000000000 +0800
@@ -430,12 +430,8 @@ static void print_bad_pte(struct vm_area
"BUG: Bad page map in process %s pte:%08llx pmd:%08llx\n",
current->comm,
(long long)pte_val(pte), (long long)pmd_val(*pmd));
- if (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);
- }
+ if (page)
+ dump_page(page);
printk(KERN_ALERT
"addr:%p vm_flags:%08lx anon_vma:%p mapping:%p index:%lx\n",
(void *)addr, vma->vm_flags, vma->anon_vma, mapping, index);
--- linux-mm.orig/mm/memory_hotplug.c 2009-12-11 10:01:25.000000000 +0800
+++ linux-mm/mm/memory_hotplug.c 2009-12-14 19:21:22.000000000 +0800
@@ -678,9 +678,9 @@ do_migrate_range(unsigned long start_pfn
if (page_count(page))
not_managed++;
#ifdef CONFIG_DEBUG_VM
- printk(KERN_INFO "removing from LRU failed"
- " %lx/%d/%lx\n",
- pfn, page_count(page), page->flags);
+ printk(KERN_ALERT "removing pfn %lx from LRU failed\n",
+ pfn);
+ dump_page(page);
#endif
}
}
--- linux-mm.orig/include/linux/mm.h 2009-12-11 10:01:25.000000000 +0800
+++ linux-mm/include/linux/mm.h 2009-12-14 19:21:22.000000000 +0800
@@ -1328,5 +1328,7 @@ extern void shake_page(struct page *p, i
extern atomic_long_t mce_bad_pages;
extern int soft_offline_page(struct page *page, int flags);
+extern void dump_page(struct page *page);
+
#endif /* __KERNEL__ */
#endif /* _LINUX_MM_H */
--
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