linux-kernel - Re: [RFC mm][PATCH 2/5] percpu cached mm counter

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Date:	Thu, 10 Dec 2009 09:33:10 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	cl@...ux-foundation.org,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	minchan.kim@...il.com
Subject: Re: [RFC mm][PATCH 2/5] percpu cached mm counter


* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> I'm sorry If I miss your point...are you saying remove all mm_counter 
> completely and remake them under perf ? If so, some proc file 
> (/proc/<pid>/statm etc) will be corrupted ?

No, i'm not suggesting that - i'm just suggesting that right now MM 
stats are not very well suited to be exposed via perf. If we wanted to 
measure/sample the information in /proc/<pid>/statm it just wouldnt be 
possible. We have a few events like pagefaults and a few tracepoints as 
well - but more would be possible IMO.

	Ingo
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