linux-kernel - Re: race condition in schedule_on_each

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Date:	Fri, 07 Jun 2013 09:34:34 +0800
From:	"weiqi@...inos.com.cn" <weiqi@...inos.com.cn>
To:	Tejun Heo <tj@...nel.org>
CC:	韦奇 <weiqi@...inos.com.cn>,
	torvalds <torvalds@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: race condition in schedule_on_each_cpu()

it's preemption mode related ,

on the 3.0.30-rt50, only   config kernel  with highest preemption level 
(Fully Preemptible Kernel (RT)) in cpu preemption model
will cause problem

and even i use the "Preemptible Kernel" or "Preemptible Kernel 
(Low-Latency Desktop)"  the problem would not happen..


 > I looked through the logs but the only worker depletion related 
patches which pop up are around CPU hotplugs, so I don't think they 
apply here. If the problem is relatively easy to reproduce && you can't 
move onto a newer kernel, I'm afraid bisection probably is the best 
option. Thanks!
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