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

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Message-ID: <20090403141743.GF8875@elte.hu>
Date:	Fri, 3 Apr 2009 16:17:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>
Cc:	Pekka Enberg <penberg@...helsinki.fi>, 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


* 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.

	Ingo
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