Message-ID: <1329806234.7333.16.camel@marge.simpson.net>
Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible
From: Mike Galbraith <efault@gmx.de>
To: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@elte.hu>, Paul Turner <pjt@google.com>
Date: Tue, 21 Feb 2012 07:37:14 +0100
In-Reply-To: <20120221000622.GH2350@linux.vnet.ibm.com>
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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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