linux-kernel - Re: [PATCH v8 03/10] sched: move cfs task on a CPU with higher capacity

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Date:	Tue, 04 Nov 2014 20:07:44 +0800
From:	"Hillf Danton" <hillf.zj@...baba-inc.com>
To:	"'Vincent Guittot'" <vincent.guittot@...aro.org>
Cc:	"'Wanpeng Li'" <kernellwp@...il.com>,
	"'Peter Zijlstra'" <peterz@...radead.org>,
	"'Ingo Molnar'" <mingo@...nel.org>,
	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	"'Preeti U Murthy'" <preeti@...ux.vnet.ibm.com>,
	"'Morten Rasmussen'" <Morten.Rasmussen@....com>,
	"'Kamalesh Babulal'" <kamalesh@...ux.vnet.ibm.com>
Subject: Re: [PATCH v8 03/10] sched: move cfs task on a CPU with higher capacity

> >>   +     /*
> >> +        * The dst_cpu is idle and the src_cpu CPU has only 1 CFS task.
> >
> >
> > Why specify one task instead of not less than one?
> 
> if cfs.h_nr_running = 0 (which should not occurs at that point), we
> don't need to do more test to check if it's worth moving the task
> because there is no task to move.
> 
I wonder if you can please shed light on the case that 
the dst_cpu is newly idle.

Thanks
Hillf

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