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

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Message-ID: <20100512193910.GP3296@balbir.in.ibm.com>
Date:	Thu, 13 May 2010 01:09:10 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	Dhaval Giani <dhaval.giani@...il.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

* menage@...gle.com <menage@...gle.com> [2010-05-12 12:36:57]:

> On Wed, May 12, 2010 at 12:29 PM, Dhaval Giani <dhaval.giani@...il.com> wrote:
> >> 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.
> >>
> >
> > But would this not fail otherwise?
> >
> 
> Assuming that mems_for_a and mems_for_b were disjoint, it would be
> fine currently.
>

Yep, that does seem like breakage. 

-- 
	Three Cheers,
	Balbir
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