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

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Message-ID: <alpine.DEB.2.00.0912101203320.5481@router.home>
Date:	Thu, 10 Dec 2009 12:04:45 -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:

>
> * Christoph Lameter <cl@...ux-foundation.org> wrote:
>
> > On Thu, 10 Dec 2009, Ingo Molnar wrote:
> >
> > >
> > > 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.
> >
> > vital MM stats are exposed via /proc/<pid> interfaces. Performance
> > monitoring is something optional MM VM stats are used for VM decision
> > on memory and process handling.
>
> You list a few facts here but what is your point?

The stats are exposed already in a well defined way. Exposing via perf is
outside of the scope of his work.

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