linux-kernel - Re: [PATCH] mm: introduce dump_page() and print symbolic flag names

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Message-ID: <20091216123310.GA17522@localhost>
Date:	Wed, 16 Dec 2009 20:33:10 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	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>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH] mm: introduce dump_page() and print symbolic flag names

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?

> [  157.525570] page flags: 100000000100068(uptodate|lru|active|swapbacked)
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