linux-kernel - Re: [PATCH] show per-process swap usage via procfs

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Message-ID: <20091108170453.GA1372@ucw.cz>
Date:	Sun, 8 Nov 2009 18:04:53 +0100
From:	Pavel Machek <pavel@....cz>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] show per-process swap usage via procfs

On Thu 2009-11-05 10:04:01, Christoph Lameter wrote:
> On Thu, 5 Nov 2009, KOSAKI Motohiro wrote:
> 
> > > On Wed, 4 Nov 2009, KAMEZAWA Hiroyuki wrote:
> > >
> > > > Now, anon_rss and file_rss is counted as RSS and exported via /proc.
> > > > RSS usage is important information but one more information which
> > > > is often asked by users is "usage of swap".(user support team said.)
> > >
> > > Hmmm... Could we do some rework of the counters first so that they are per
> > > cpu?
> >
> > per-cpu swap counter?
> > It seems overkill effort....
> 
> The other alternative is to use atomic ops which are significantly slower
> and have an impact on critical sections.

...but compared to disk i/o, overhead should be almost zero, right?
Keep it simple...

								Pavel

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