Date: Fri, 28 Jun 2013 13:07:30 +0200
From: Peter Zijlstra <peterz@infradead.org>
To: Paul Turner <pjt@google.com>
Cc: Alex Shi <alex.shi@intel.com>, Ingo Molnar <mingo@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Borislav Petkov <bp@alien8.de>, Namhyung Kim <namhyung@kernel.org>,
        Mike Galbraith <efault@gmx.de>,
        Morten Rasmussen <morten.rasmussen@arm.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        gregkh@linuxfoundation.org,
        Preeti U Murthy <preeti@linux.vnet.ibm.com>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>, Len Brown <len.brown@intel.com>,
        rafael.j.wysocki@intel.com, jkosina@suse.cz,
        Clark Williams <clark.williams@gmail.com>,
        "tony.luck@intel.com" <tony.luck@intel.com>, keescook@chromium.org,
        Mel Gorman <mgorman@suse.de>, Rik van Riel <riel@redhat.com>,
        fweisbec@gmail.com
Subject: Re: [Resend patch v8 0/13] use runnable load in schedule balance
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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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