Re: [patch 15/16] sched: return unused runtime on voluntary sleep

From: Peter Zijlstra
Date: Thu Jun 23 2011 - 11:27:21 EST

On Tue, 2011-06-21 at 00:17 -0700, Paul Turner wrote:
> plain text document attachment (sched-bwc-simple_return_quota.patch)
> When a local cfs_rq blocks we return the majority of its remaining quota to the
> global bandwidth pool for use by other runqueues.

OK, I saw return_cfs_rq_runtime() do that.

> We do this only when the quota is current and there is more than
> min_cfs_rq_quota [1ms by default] of runtime remaining on the rq.


> In the case where there are throttled runqueues and we have sufficient
> bandwidth to meter out a slice, a second timer is kicked off to handle this
> delivery, unthrottling where appropriate.

I'm having trouble there, what's the purpose of the timer, you could
redistribute immediately. None of this is well explained.
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