linux-kernel - Re: [Resend patch v8 0/13] use runnable load in schedule balance

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Message-ID: <20130628110730.GA6626@twins.programming.kicks-ass.net>
Date:	Fri, 28 Jun 2013 13:07:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	Alex Shi <alex.shi@...el.com>, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Morten Rasmussen <morten.rasmussen@....com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	gregkh@...uxfoundation.org,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, rafael.j.wysocki@...el.com,
	jkosina@...e.cz, Clark Williams <clark.williams@...il.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>, keescook@...omium.org,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	fweisbec@...il.com
Subject: Re: [Resend patch v8 0/13] use runnable load in schedule balance

On Fri, Jun 28, 2013 at 03:56:25AM -0700, Paul Turner wrote:

> So this is actually an interesting idea, but don't think of it as
> overweight.  What "cfs_rq->blocked_load_avg / 2" means is actually
> blocked_load_avg one period from now.  This is interesting because it
> makes the (reasonable) supposition that blocked load is not about to
> immediately wake, but will continue to decay.
> 
> Could you try testing the gvr_lb_tip branch at
> git://git.kernel.org/pub/scm/linux/kernel/git/pjt/sched-tip.git ?
> 
> It's an extension to your series that tries to improve some of the
> cpu_load interactions in an alternate way to the above.
> 
> It seems a little better on one and two-socket machines; but we
> couldn't reproduce/compare to your best performance results since they
> were taken on larger machines.

Oh nice.. it does away with the entire cpu_load[] array thing. Just what
Frederic needs for his NOHZ stuff as well -- he's currently abusing
LB_BIAS for that.
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