linux-kernel - Re: [RFC] print symbolic page flag names in bad

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Date:	Mon, 7 Dec 2009 10:02:22 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
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>,
	Ingo Molnar <mingo@...e.hu>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC] print symbolic page flag names in bad_page()

On Mon, Dec 07, 2009 at 07:00:16AM +0800, Andi Kleen wrote:
> > So how about this patch?
> 
> I like it. Decoding the flags by hand is always a very unpleasant experience.
> Bonus: dump_page can be called from kgdb too.

Thank you.  And I'd like to elaborate a bit more on the rational.

Making the page-types tool depend on .config is fragile and dangerous.
It would seem to work but silently return wrong results for a newbie
user or a careless hacker.

And it's troublesome even for home made kernels by a kernel developer.

For example, typically I run many kernel trees with different versions and
kconfigs (both of which change frequently) concurrently.  This means I
would have to judge to run "this" page-types or "that" page-types, and
to check if this page-types is uptodate, and if the .config is in sync
with the running kernel image..

An in-kernel dump_page() makes life easier.

Thanks,
Fengguang
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