linux-kernel - Re: [patch00/05]: Containers(V2)- Introduction

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Date:	Wed, 20 Sep 2006 20:27:04 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	rohitseth@...gle.com
Cc:	Christoph Lameter <clameter@....com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	CKRM-Tech <ckrm-tech@...ts.sourceforge.net>, devel@...nvz.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: Re: [patch00/05]: Containers(V2)- Introduction

On Wed, 2006-09-20 at 11:14 -0700, Rohit Seth wrote:
> On Wed, 2006-09-20 at 20:06 +0200, Peter Zijlstra wrote:
> > On Wed, 2006-09-20 at 10:52 -0700, Christoph Lameter wrote:
> > > On Wed, 20 Sep 2006, Rohit Seth wrote:
> > > 
> > > > Right now the memory handler in this container subsystem is written in
> > > > such a way that when existing kernel reclaimer kicks in, it will first
> > > > operate on those (container with pages over the limit) pages first.  But
> > > > in general I like the notion of containerizing the whole reclaim code.
> > > 
> > > Which comes naturally with cpusets.
> > 
> > How are shared mappings dealt with, are pages charged to the set that
> > first faults them in?
> > 
> 
> For anonymous pages (simpler case), they get charged to the faulting
> task's container.
> 
> For filesystem pages (could be shared across tasks running different
> containers): Every time a new file mapping is created, it is bound to a
> container of the process creating that mapping.  All subsequent pages
> belonging to this mapping will belong to this container, irrespective of
> different tasks running in different containers accessing these pages.
> Currently, I've not implemented a mechanism to allow a file to be
> specifically moved into or out of container. But when that gets
> implemented then all pages belonging to a mapping will also move out of
> container (or into a new container).

Yes, I read that in your patches, I was wondering how the cpuset
approach would handle this.

Neither are really satisfactory for shared mappings.

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