linux-kernel - Re: [PATCH] sched: Enable arch-specific asym packing option in sched domain

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Message-ID: <5722.1336171918@neuling.org>
Date:	Sat, 05 May 2012 08:51:58 +1000
From:	Michael Neuling <mikey@...ling.org>
To:	Diwakar Tundlam <dtundlam@...dia.com>
cc:	'Peter Zijlstra' <a.p.zijlstra@...llo.nl>,
	'Ingo Molnar' <mingo@...nel.org>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Christoph Lameter' <cl@...two.org>,
	'Stephen Rothwell' <sfr@...b.auug.org.au>,
	'Benjamin Herrenschmidt' <benh@...nel.crashing.org>,
	'David Rientjes' <rientjes@...gle.com>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	Peter De Schrijver <pdeschrijver@...dia.com>
Subject: Re: [PATCH] sched: Enable arch-specific asym packing option in sched domain

> We need this for Tegra's slight asymmetry with core0.

This would seem to be to be a different problem.  I don't think the
packing mechanism is what you want.

Shouldn't you be increasing the CPU power of this core, so that all
tasks get a fair go on this core?  Otherwise you're breaking the
fundamental concept of a completely fair scheduler.

Using this packing mechanism you won't get this.  Any task that lands on
core 0 will get an unfair amount of computation power, compared to tasks
that landed on core 1.

Mikey
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