linux-kernel - Re: [PATCH v3 6/8] mm/page_owner: keep track of page owners

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Message-ID: <20141204065622.GB12141@js1304-P5Q-DELUXE>
Date:	Thu, 4 Dec 2014 15:56:22 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Chintan Pandya <cpandya@...eaurora.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>, Dave Hansen <dave@...1.net>,
	Michal Nazarewicz <mina86@...a86.com>,
	Jungsoo Son <jungsoo.son@....com>,
	Ingo Molnar <mingo@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 6/8] mm/page_owner: keep track of page owners

On Wed, Dec 03, 2014 at 06:54:08PM +0530, Chintan Pandya wrote:
> Hi Kim,

Hello, Chintan.

> 
> This is really useful stuff that you are doing. And the runtime
> allocation for storing page owner stack is a good call.
> 
> Along with that, we also use extended version of the original
> page_owner patch. The extension is, to store stack trace at the time
> of freeing the page. That will indeed eat up space like anything
> (just double of original page_owner) but it helps in debugging some
> crucial issues. Like, illegitimate free, finding leaked pages (if we

Sound really interesting. I hope to see it.

> store their time stamps) etc. The same has been useful in finding
> double-free cases in drivers. But we have never got a chance to
> upstream that. Now that these patches are being discussed again, do
> you think it would be good idea to integrate in the same league of
> patches ?

Good to hear. I think that you can upstream it separately. If you send
the patch, I will review it and help to merge it.

Thanks.
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