linux-kernel - Re: [PATCH v3 4/6] add a new scheduler hook for context switch

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Message-ID: <4FC60D9D.8080705@parallels.com>
Date:	Wed, 30 May 2012 16:07:57 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>,
	<devel@...nvz.org>, Paul Turner <pjt@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	<handai.szj@...il.com>, <Andrew.Phillips@...x.com>,
	Serge Hallyn <serge.hallyn@...onical.com>
Subject: Re: [PATCH v3 4/6] add a new scheduler hook for context switch

On 05/30/2012 03:20 PM, Peter Zijlstra wrote:
> /me cries a little.. I was hoping to fix put_prev_task.. see:
>
>    https://lkml.org/lkml/2012/2/16/487
>
> (I've actually got a 4 patch split out of that if anybody cares)
>
> Its just one of those things stuck behind the -ENOTIME tree :/
>
> The plan is to 'merge' put_prev_task and pick_next_task into one and
> avoid a lot of the up-down walking.
>
> You just added a constraint for always having to walk the entire thing
> up -- cgroups is too damn expensive already, we should be trimming this
> nonsense not bloating it.

if they are merged, then I don't need a new hook.

Do you have plans to do it? I'd be happy to continue the work if you 
lack the time, since I am directly interested in the functionality.


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