From: Ingo Molnar <mingo@elte.hu>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
minchan.kim@gmail.com
Subject: Re: [RFC mm][PATCH 2/5] percpu cached mm counter
Date: Thu, 10 Dec 2009 18:38:19 +0100 [thread overview]
Message-ID: <20091210173819.GA5256@elte.hu> (raw)
In-Reply-To: <alpine.DEB.2.00.0912101134220.5481@router.home>
* Christoph Lameter <cl@linux-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?
Ingo
WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@elte.hu>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
minchan.kim@gmail.com
Subject: Re: [RFC mm][PATCH 2/5] percpu cached mm counter
Date: Thu, 10 Dec 2009 18:38:19 +0100 [thread overview]
Message-ID: <20091210173819.GA5256@elte.hu> (raw)
In-Reply-To: <alpine.DEB.2.00.0912101134220.5481@router.home>
* Christoph Lameter <cl@linux-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?
Ingo
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next prev parent reply other threads:[~2009-12-10 17:38 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-10 7:31 [RFC mm][PATCH 0/5] per mm counter updates KAMEZAWA Hiroyuki
2009-12-10 7:31 ` KAMEZAWA Hiroyuki
2009-12-10 7:33 ` [RFC mm][PATCH 1/5] mm counter cleanup KAMEZAWA Hiroyuki
2009-12-10 7:33 ` KAMEZAWA Hiroyuki
2009-12-10 17:30 ` Christoph Lameter
2009-12-10 17:30 ` Christoph Lameter
2009-12-10 23:42 ` KAMEZAWA Hiroyuki
2009-12-10 23:42 ` KAMEZAWA Hiroyuki
2009-12-11 0:07 ` Minchan Kim
2009-12-11 0:07 ` Minchan Kim
2009-12-10 7:34 ` [RFC mm][PATCH 2/5] percpu cached mm counter KAMEZAWA Hiroyuki
2009-12-10 7:34 ` KAMEZAWA Hiroyuki
2009-12-10 7:54 ` Ingo Molnar
2009-12-10 7:54 ` Ingo Molnar
2009-12-10 8:20 ` KAMEZAWA Hiroyuki
2009-12-10 8:20 ` KAMEZAWA Hiroyuki
2009-12-10 8:33 ` Ingo Molnar
2009-12-10 8:33 ` Ingo Molnar
2009-12-10 8:42 ` KAMEZAWA Hiroyuki
2009-12-10 8:42 ` KAMEZAWA Hiroyuki
2009-12-10 17:35 ` Christoph Lameter
2009-12-10 17:35 ` Christoph Lameter
2009-12-10 17:38 ` Ingo Molnar [this message]
2009-12-10 17:38 ` Ingo Molnar
2009-12-10 18:04 ` Christoph Lameter
2009-12-10 18:04 ` Christoph Lameter
2009-12-10 18:54 ` Ingo Molnar
2009-12-10 18:54 ` Ingo Molnar
2009-12-11 0:11 ` KAMEZAWA Hiroyuki
2009-12-11 0:11 ` KAMEZAWA Hiroyuki
2009-12-10 17:34 ` Christoph Lameter
2009-12-10 17:34 ` Christoph Lameter
2009-12-10 17:51 ` Christoph Lameter
2009-12-10 17:51 ` Christoph Lameter
2009-12-11 0:30 ` KAMEZAWA Hiroyuki
2009-12-11 0:30 ` KAMEZAWA Hiroyuki
2009-12-11 0:40 ` Minchan Kim
2009-12-11 0:40 ` Minchan Kim
2009-12-11 0:51 ` KAMEZAWA Hiroyuki
2009-12-11 0:51 ` KAMEZAWA Hiroyuki
2009-12-11 1:25 ` Minchan Kim
2009-12-11 1:25 ` Minchan Kim
2009-12-11 1:26 ` KAMEZAWA Hiroyuki
2009-12-11 1:26 ` KAMEZAWA Hiroyuki
2009-12-10 7:59 ` [RFC mm][PATCH 3/5] counting swap ents per mm KAMEZAWA Hiroyuki
2009-12-10 7:59 ` KAMEZAWA Hiroyuki
2009-12-10 17:55 ` Christoph Lameter
2009-12-10 17:55 ` Christoph Lameter
2009-12-11 0:33 ` KAMEZAWA Hiroyuki
2009-12-11 0:33 ` KAMEZAWA Hiroyuki
2009-12-11 1:07 ` Minchan Kim
2009-12-11 1:07 ` Minchan Kim
2009-12-10 8:00 ` [RFC mm][PATCH 4/5] add a lowmem check function KAMEZAWA Hiroyuki
2009-12-10 8:00 ` KAMEZAWA Hiroyuki
2009-12-10 17:59 ` Christoph Lameter
2009-12-10 17:59 ` Christoph Lameter
2009-12-11 0:39 ` KAMEZAWA Hiroyuki
2009-12-11 0:39 ` KAMEZAWA Hiroyuki
2009-12-11 13:35 ` Christoph Lameter
2009-12-11 13:35 ` Christoph Lameter
2009-12-11 1:09 ` Minchan Kim
2009-12-11 1:09 ` Minchan Kim
2009-12-10 8:01 ` [RFC mm][PATCH 5/5] counting lowmem rss per mm KAMEZAWA Hiroyuki
2009-12-10 8:01 ` KAMEZAWA Hiroyuki
2009-12-11 1:12 ` Minchan Kim
2009-12-11 1:12 ` Minchan Kim
2009-12-10 8:03 ` [RFC mm][PATCH 0/5] per mm counter updates KAMEZAWA Hiroyuki
2009-12-10 8:03 ` KAMEZAWA Hiroyuki
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