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

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Date:	Mon, 28 Oct 2013 13:22:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Paul Turner <pjt@...gle.com>, 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>,
	Greg Kroah-Hartman <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" <rafael.j.wysocki@...el.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Clark Williams <clark.williams@...il.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Kees Cook <keescook@...omium.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>
Subject: Re: [Resend patch v8 0/13] use runnable load in schedule balance

On Mon, Oct 28, 2013 at 11:25:34AM +0100, Frederic Weisbecker wrote:
> 2013/6/28 Peter Zijlstra <peterz@...radead.org>:
> > 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.
> 
> Hi guys,
> 
> Is there any updates on the status of this work? I'm getting back on
> fixing the cpu_load for full dynticks and this patchset was apparently
> taking care of that.

I talked to PJT about this last week, he said Ben was looking (or going
to look into) this sometime 'soon' iirc.
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