linux-kernel - Re: [PATCH v2] sched: Fast idling of CPU when system is partially loaded

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Message-ID: <20140623162234.GP5714@two.firstfloor.org>
Date:	Mon, 23 Jun 2014 18:22:34 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Tim Chen <tim.c.chen@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>,
	Andi Kleen <andi@...stfloor.org>,
	Michel Lespinasse <walken@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Jason Low <jason.low2@...com>,
	Davidlohr Bueson <davidlohr@...com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched: Fast idling of CPU when system is partially
 loaded

> So I don't get why we can't do the below; I think Jason tried to ask the
> same...

The important part for performance is to minimize the cache line transfers. Your
unconditional variant would cause more dirty cache lines than Tim's,
right?

-Andi
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