linux-kernel - Re: sched: Avoid SMT siblings in select_idle

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Message-ID: <1329806234.7333.16.camel@marge.simpson.net>
Date:	Tue, 21 Feb 2012 07:37:14 +0100
From:	Mike Galbraith <efault@....de>
To:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

On Tue, 2012-02-21 at 05:36 +0530, Srivatsa Vaddagiri wrote:

> fwiw the patch I had sent does a wakeup balance within prev_cpu's
> cache_domain (and not outside).

Yeah, the testing I did was turn on the flag, and measure.  With single
domain scans, maybe select_idle_sibling() could just go away.  It ain't
free either.

-Mike

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