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

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Message-ID: <6599ad830609201852k12cee6eey9086247c9bdec8b@mail.google.com>
Date:	Wed, 20 Sep 2006 18:52:30 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	sekharan@...ibm.com
Cc:	"Paul Jackson" <pj@....com>, npiggin@...e.de,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	rohitseth@...gle.com, devel@...nvz.org, clameter@....com
Subject: Re: [ckrm-tech] [patch00/05]: Containers(V2)- Introduction

On 9/20/06, Chandra Seetharaman <sekharan@...ibm.com> wrote:
>
> Interesting. So you could set up the fake node with "guarantee" and let
> it grow till "limit" ?

Sure - that works great. (Theoretically you could do this all in
userspace - start by assigning  "guarantee" nodes to a
container/cpuset and when it gets close to its memory limit assign
more nodes to it. But in practice userspace can't keep up with rapid
memory allocators.

>
> BTW, can you do these with fake nodes:
>  - dynamic creation
>  - dynamic removal
>  - dynamic change of size

The current fake numa support requires you to choose your node layout
at boot time - I've been working with 64 fake nodes of 128M each,
which gives a reasonable granularity for dividing a machine between
multiple different sized jobs.

>
> Also, How could we account when a process moves from one node to
> another ?

If you want to do that (the systems I'm working on don't really) you
could probably do it with the migrate_pages() syscall. It might not be
that efficient though.

Paul
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