linux-kernel - Re: [RFC PATCH 0/2] sched: simplify the select_task_rq

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Message-ID: <1359023666.5833.105.camel@marge.simpson.net>
Date:	Thu, 24 Jan 2013 11:34:26 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	peterz@...radead.org, mingo@...nel.org, a.p.zijlstra@...llo.nl
Subject: Re: [RFC PATCH 0/2] sched: simplify the select_task_rq_fair()

On Thu, 2013-01-24 at 17:26 +0800, Michael Wang wrote: 
> On 01/24/2013 05:07 PM, Mike Galbraith wrote:
> > On Thu, 2013-01-24 at 16:14 +0800, Michael Wang wrote:
> > 
> >> Now it's time to work on v3 I think, let's see what we could get this time.
> > 
> > Maybe v3 can try to not waste so much ram on affine map?
> 
> Yeah, that has been a question in my mind at very beginning, but how...

Allocate at domain build time the max we can acquire via hotplug?
> > Even better would be if it could just go away, along with relic of the
> > bad old days wake_affine(), and we make the balance path so damn light
> > but clever that select_idle_sibling() can go away too... and a pony ;-)
> 
> Hmm...may be, I need some consideration here, a totally balance path,
> interesting...

Unification is the right target, hitting it might not be so easy though.

> But I think we still need the clean code which sbm bring to us, do we?

Sure, if it makes things perform better.

-Mike

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