linux-kernel - Re: + page-owner-tracking.patch added to -mm tree

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Date:	Fri, 03 Apr 2009 17:36:57 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	Mel Gorman <mel@....ul.ie>, Jason Baron <jbaron@...hat.com>,
	linux-kernel@...r.kernel.org, mm-commits@...r.kernel.org,
	alexn@....su.se, akpm@...ux-foundation.org, alexn@...ia.com,
	apw@...dowen.org, cl@...ux-foundation.org, haveblue@...ibm.com,
	kamezawa.hiroyu@...fujitu.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	"Fr?d?ric Weisbecker" <fweisbec@...il.com>
Subject: Re: + page-owner-tracking.patch added to -mm tree

Ingo Molnar wrote:
> * Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro> wrote:
> 
>> One thing I'm not sure about this patch is whether it manages to 
>> record an allocation only once, i.e. does it log a single event 
>> when/if the slab allocator requests pages? Some time ago I sent a 
>> patch adding GFP_NOTRACE to gfp.h, but was rejected. Maybe this 
>> could be a way out of the mess.
>>
>> (GFP_NOTRACE would also allow us to log "backend" allocations 
>> easily and treat them separately, for the record, or simply filter 
>> them out.)
> 
> makes a lot of sense IMO to annotate these via a GFP flag.

Yup, make sense. I think I rejected the patch (did I?) because I wanted 
to fix the slub/slab mess differently but here it makes perfect sense.

			Pekka
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