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

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Message-ID: <alpine.DEB.2.00.0912101131200.5481@router.home>
Date:	Thu, 10 Dec 2009 11:34:03 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	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>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	minchan.kim@...il.com
Subject: Re: [RFC mm][PATCH 2/5] percpu cached mm counter

On Thu, 10 Dec 2009, Ingo Molnar wrote:

> I.e. why not expose these stats via perf events and counts as well,
> beyond the current (rather minimal) set of MM stats perf supports
> currently?

Certainly one can write perf events that do a simular thing but that is
beyond the scope of the work here. This is the result of a test program.
The point here is to avoid fault regressions while introducing new process
specific counters that are then used by other VM code to make decisions
about a process.


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