linux-kernel - Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked

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Message-ID: <1407253377.2487.11.camel@j-VirtualBox>
Date:	Tue, 05 Aug 2014 08:42:57 -0700
From:	Jason Low <jason.low2@...com>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Ben Segall <bsegall@...gle.com>,
	Waiman Long <Waiman.Long@...com>, Mel Gorman <mgorman@...e.de>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Chegu Vinod <chegu_vinod@...com>,
	Scott J Norton <scott.norton@...com>
Subject: Re: [PATCH] sched: Reduce contention in update_cfs_rq_blocked_load

On Tue, 2014-08-05 at 03:15 +0800, Yuyang Du wrote:
> Hi Jason,
> 
> I am not sure whether you noticed my latest work: rewriting per entity load average
> 
> http://article.gmane.org/gmane.linux.kernel/1760754
> http://article.gmane.org/gmane.linux.kernel/1760755
> http://article.gmane.org/gmane.linux.kernel/1760757
> http://article.gmane.org/gmane.linux.kernel/1760756
> 
> which simply does not track blocked load average at all. Are you interested in
> testing the patchset with the workload you have?

Hi Yuyang, yes I can also test your latest patchset with some of the
AIM7 workloads. Not needing extra overhead for the blocked load should
also address this contention in update_cfs_rq_blocked_load().

>  The comparison can also help
> us understand the rewrite. Overall, per our tests, the overhead should be less,
> and perf should be better.


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