Re: sched: Avoid SMT siblings in select_idle_sibling() if possible

[Mike Galbraith]

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@xxxxxxxxx>
> > 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@xxxxxxxxx>
> > Cc: Mike Galbraith <efault@xxxxxx> 
> 
> Thanks Suresh!

Tested-by: Mike Galbraith <efault@xxxxxx>


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