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Date:	Tue, 17 Jun 2014 14:09:38 +0200
From:	Peter Zijlstra <>
To:	Tim Chen <>
Cc:	Ingo Molnar <>, Andi Kleen <>,
	Michel Lespinasse <>,
	Rik van Riel <>,
	Peter Hurley <>,
	Jason Low <>,
	Davidlohr Bueson <>,
Subject: Re: [PATCH] sched: Fast idling of CPU when system is partially loaded

On Mon, Jun 16, 2014 at 08:50:07AM -0700, Tim Chen wrote:
> > The worry I have is that this update is 'slow'. We could have grown many
> > tasks since the last update.
> The update to turn on the indicator is immediate and triggered in
> add_nr_running. So if there are more than one tasks on any cpu, 
> we start load balancing again right away.  It is only the 
> clearing of the indicator in update_sd_lb_stats that takes time.
> That does no harm as the cleared indicator is for the skipping of load
> balance, which can be delayed.

Oh right, shows me I shouldn't be reading patches on sunday or similarly
daft times ;)

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