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From: Wanpeng Li <wanpeng.li@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>, Juri Lelli <juri.lelli@arm.com>
Cc: Kirill Tkhai <ktkhai@parallels.com>,
	Ingo Molnar <mingo@redhat.com>,
	linux-kernel@vger.kernel.org,
	Wanpeng Li <wanpeng.li@linux.intel.com>
Subject: Re: [PATCH v5] sched/deadline: support dl task migration during cpu hotplug
Date: Thu, 20 Nov 2014 16:49:32 +0800	[thread overview]
Message-ID: <20141120084932.GA3818@kernel> (raw)
In-Reply-To: <1415874091.15631.44.camel@tkhai>

Hi Peterz, Juri,
On Thu, Nov 13, 2014 at 01:21:31PM +0300, Kirill Tkhai wrote:
>> > Also, we should think about the following situation.
>> >
>> > DL task is left on dead rq. In your scheme it will be moved by the timer.
>> > But what will be if somebody changes the class of the task (before timer)?
>> 
>> I think timer will be cancelled in switched_from_dl().
>
>Yeah, but nobody will move this task to alive rq.
>
>> > In this case the task still remains on dead rq.
>> >
>> > We should handle this situation in some way.

I think pang's patch handle the exclusive cpusets rd->span issue, the concern 
which Kirill mentioned above maybe the last one block the patch merged, is 
there any idea or proposal from you experts?

Regards,
Wanpeng Li 

>> >
>> > Kirill
>> >
>> >
>> > --
>> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>> > the body of a message to majordomo@vger.kernel.org
>> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
>> > Please read the FAQ at  http://www.tux.org/lkml/
>> 
>

      parent reply	other threads:[~2014-11-20  9:10 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-12  1:06 [PATCH v5] sched/deadline: support dl task migration during cpu hotplug Wanpeng Li
2014-11-12 15:08 ` Juri Lelli
2014-11-12 15:39   ` Peter Zijlstra
2014-11-12 23:02     ` Wanpeng Li
2015-01-05 14:52     ` Peter Zijlstra
2015-01-06  2:14       ` Wanpeng Li
2014-11-12 23:22   ` Wanpeng Li
2014-11-18 23:18   ` Wanpeng Li
2014-11-19 10:13     ` Juri Lelli
2014-11-19 12:30       ` Wanpeng Li
2014-11-19 13:49         ` Juri Lelli
2014-11-19 23:08           ` Wanpeng Li
2014-11-12 16:27 ` Kirill Tkhai
2014-11-12 22:56   ` Wanpeng Li
2014-11-13 10:10     ` Kirill Tkhai
2014-11-13 10:19       ` Wanpeng Li
2014-11-13 10:21         ` Kirill Tkhai
2014-11-16 22:59           ` Wanpeng Li
2014-11-20  8:49           ` Wanpeng Li [this message]

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