Re: [PATCH 1/8] PM: Add suspend block api.

From: Tejun Heo
Date: Thu May 20 2010 - 04:32:25 EST


(sorry about late reply)

On 04/30/2010 07:26 PM, Oleg Nesterov wrote:
> Currently _cpu_down() can't flush and/or stop the frozen cwq->thread.
> IIRC this is fixable, but needs the nasty complications. We should
> thaw + stop the frozen cwq->thread, then move the pending works to
> another CPU.

Oh, this isn't an issue w/ cmwq. While frozen all new works are
collected into per-cpu delayed worklist and while frozen trustee in
charge of the cpu will keep waiting. Once thawed, trustee will
execute all works including the delayed ones unbound to any cpu.


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