linux-kernel - Re: [PATCH V2 2/3] sched: Fix race in idle

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Message-ID: <52FC7835.1090509@linaro.org>
Date:	Thu, 13 Feb 2014 15:45:57 +0800
From:	Alex Shi <alex.shi@...aro.org>
To:	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Preeti Murthy <preeti.lkml@...il.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	mingo@...nel.org, LKML <linux-kernel@...r.kernel.org>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Subject: Re: [PATCH V2 2/3] sched: Fix race in idle_balance()

On 02/11/2014 07:11 PM, Daniel Lezcano wrote:
> On 02/10/2014 10:24 AM, Preeti Murthy wrote:
>> HI Daniel,
>>
>> Isn't the only scenario where another cpu can put an idle task on
>> our runqueue,
> 
> Well, I am not sure to understand what you meant, but I assume you are
> asking if it is possible to have a task to be pulled when we are idle,
> right ?
> 
> This patch fixes the race when the current cpu is *about* to enter idle
> when calling schedule().

Preeti said the she didn't see a possible to insert a task on the cpu.

I also did a quick check, maybe task come from wakeup path?

-- 
Thanks
    Alex
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