linux-kernel - Re: [PATCH] sched: wakeup buddy

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Message-ID: <1363082932.14933.19.camel@laptop>
Date:	Tue, 12 Mar 2013 11:08:52 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...nel.org>,
	Alex Shi <alex.shi@...el.com>, Paul Turner <pjt@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH] sched: wakeup buddy

Does something simple like a per-task throttle of wake_affine() gain
similar benefits? Say something like only do wake_affine() once every
10 ms or so (counting on the wakee, not waker).

The rationale being that wake_affine() relies on load-balance
statistics that aren't updated that much faster, so calling it more
often than that seems pointless.

Something like that should take a lot less lines to implement.

Just wondering..

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