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Date: Mon, 28 Oct 2013 11:25:34 +0100
Message-ID: <CAFTL4hxSfWOb_DVryjGY4hgsaoBFi7zfbKuJC6eMk4+4nQOf-Q@mail.gmail.com>
Subject: Re: [Resend patch v8 0/13] use runnable load in schedule balance
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>, 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>,
        Greg Kroah-Hartman <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" <rafael.j.wysocki@intel.com>,
        Jiri Kosina <jkosina@suse.cz>,
        Clark Williams <clark.williams@gmail.com>,
        "tony.luck@intel.com" <tony.luck@intel.com>,
        Kees Cook <keescook@chromium.org>, Mel Gorman <mgorman@suse.de>,
        Rik van Riel <riel@redhat.com>
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2013/6/28 Peter Zijlstra <peterz@infradead.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.

Thanks.
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