linux-kernel - Re: [PATCH/RFC] Have sane default values for cpusets

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Message-ID: <h2z6599ad831005121220h7956eb62yeea13626093b4a6e@mail.gmail.com>
Date:	Wed, 12 May 2010 12:20:33 -0700
From:	Paul Menage <menage@...gle.com>
To:	Dhaval Giani <dhaval.giani@...il.com>
Cc:	balbir@...ux.vnet.ibm.com, peterz@...radead.org,
	lennart@...ttering.net, jsafrane@...hat.com, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH/RFC] Have sane default values for cpusets

On Wed, May 12, 2010 at 12:10 PM, Dhaval Giani <dhaval.giani@...il.com> wrote:
> On Wed, May 12, 2010 at 9:01 PM, Paul Menage <menage@...gle.com> wrote:
>> What about the case where some subset of the parent's mems/cpus are
>> given to a child with the exclusive flag set?
>>
>
> As I mentioned in the TODO, it is still to be handled.

Oops, sorry, just read the patch :-)

> But it should
> simply exclude those mems/cpus which are exclusive. It was a bit more
> involved than the effort I wanted to put in before gauging the
> reactions.

I think the idea is reasonable - the only way that I could see it
breaking someone would be code that currently does something like:

mkdir A
mkdir B
echo 1 > A/mem_exclusive
echo 1 > B/mem_exclusive
echo $mems_for_a > A/mems
echo $mems_for_b > B/mems

The attempts to set the mem_exclusive flags would fail, since A and B
would both have all of the parent's mems.

Paul
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