Re: [PATCH v2] sched: Fast idling of CPU when system is partially loaded

[Peter Zijlstra]

On Mon, Jun 23, 2014 at 06:22:34PM +0200, Andi Kleen wrote:
> > So I don't get why we can't do the below; I think Jason tried to ask the
> > same...
> 
> The important part for performance is to minimize the cache line transfers. Your
> unconditional variant would cause more dirty cache lines than Tim's,
> right?

Don't think so. We already have the overloaded thing on stack and dirty,
and the only thing it needs is rq->nr_running and we already
unconditionally load that.
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