linux-kernel - Re: [RFC] Track mlock()ed pages

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Message-Id: <20070127032133.4368e2cb.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Sat, 27 Jan 2007 03:21:33 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	clameter@....com, nickpiggin@...oo.com.au, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Track mlock()ed pages

On Fri, 26 Jan 2007 10:10:27 -0800
Andrew Morton <akpm@...l.org> wrote:

> On Fri, 26 Jan 2007 07:44:42 -0800 (PST)
> Christoph Lameter <clameter@....com> wrote:
> 
> > On Fri, 26 Jan 2007, Andrew Morton wrote:
> > 
> > > > > > Track mlocked pages via a ZVC
> > > 
> > > Why?
> > 
> > Large amounts of mlocked pages may be a problem for 
> > 
> > 1. Reclaim behavior.
> > 
> > 2. Defragmentation
> > 
> 
> We know that.  What has that to do with this patch?
> 
3. just counting mlocked pages....

I have an experience that I was asked by the user to calculate "free" pages
on the system where several big 'mlockall' process runs, which shared amounts of
pages...when I answered the user cannot trust the result of "/bin/free" 
if you use mlock processes.

It was very fun :P

-Kame

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