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Date: Fri, 18 Nov 2011 16:26:10 +0100 From: Mike Galbraith <efault@....de> To: Peter Zijlstra <peterz@...radead.org> Cc: 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 Fri, 2011-11-18 at 16:12 +0100, Peter Zijlstra wrote: > On Thu, 2011-11-17 at 11:08 -0800, Suresh Siddha wrote: > > > > From: Suresh Siddha <suresh.b.siddha@...el.com> > > Subject: sched: cleanup domain traversal in select_idle_sibling > > > > Instead of going through the scheduler domain hierarchy multiple times > > (for giving priority to an idle core over an idle SMT sibling in a busy > > core), start with the highest scheduler domain with the SD_SHARE_PKG_RESOURCES > > flag and traverse the domain hierarchy down till we find an idle group. > > > > This cleanup also addresses an issue reported by Mike where the recent > > changes returned the busy thread even in the presence of an idle SMT > > sibling in single socket platforms. > > > > Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com> > > Cc: Mike Galbraith <efault@....de> > > Thanks Suresh! Tested-by: Mike Galbraith <efault@....de> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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