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

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Message-ID: <alpine.DEB.1.10.0911051003060.25718@V090114053VZO-1>
Date:	Thu, 5 Nov 2009 10:04:01 -0500 (EST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	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, 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.

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