linux-kernel - Re: [RFC PATCH 0/5] enable runnable load avg in load balance

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Message-ID: <xm26ehjg5gra.fsf@sword-of-the-dawn.mtv.corp.google.com>
Date:	Mon, 26 Nov 2012 11:03:05 -0800
From:	Benjamin Segall <bsegall@...gle.com>
To:	Alex Shi <alex.shi@...el.com>
Cc:	mingo@...hat.com, peterz@...radead.org, pjt@...gle.com,
	preeti@...ux.vnet.ibm.com, vincent.guittot@...aro.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 0/5] enable runnable load avg in load balance

So, I've been trying out using the runnable averages for load balance in
a few ways, but haven't actually gotten any improvement on the
benchmarks I've run. I'll post my patches once I have the numbers down,
but it's generally been about half a percent to 1% worse on the tests
I've tried.

The basic idea is to use (cfs_rq->runnable_load_avg +
cfs_rq->blocked_load_avg) (which should be equivalent to doing
load_avg_contrib on the rq) for cfs_rqs and possibly the rq, and
p->se.load.weight * p->se.avg.runnable_avg_sum / period for tasks.

I have not yet tried including wake_affine, so this has just involved
h_load (task_load_down and task_h_load), as that makes everything
(besides wake_affine) be based on either the new averages or the
rq->cpu_load averages.
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