From: Alex Shi <alex.shi@linaro.org>
To: Peter Zijlstra <peterz@infradead.org>, daniel.lezcano@linaro.org
Cc: mingo@redhat.com, tglx@linutronix.de, vincent.guittot@linaro.org,
morten.rasmussen@arm.com, linux-kernel@vger.kernel.org,
akpm@linux-foundation.org, fengguang.wu@intel.com,
linaro-kernel@lists.linaro.org
Subject: Re: [RFC PATCH] sched: find the latest idle cpu
Date: Wed, 15 Jan 2014 22:37:56 +0800 [thread overview]
Message-ID: <52D69D44.4090504@linaro.org> (raw)
In-Reply-To: <20140115073533.GU31570@twins.programming.kicks-ass.net>
On 01/15/2014 03:35 PM, Peter Zijlstra wrote:
> On Wed, Jan 15, 2014 at 12:07:59PM +0800, Alex Shi wrote:
>> Currently we just try to find least load cpu. If some cpus idled,
>> we just pick the first cpu in cpu mask.
>>
>> In fact we can get the interrupted idle cpu or the latest idled cpu,
>> then we may get the benefit from both latency and power.
>> The selected cpu maybe not the best, since other cpu may be interrupted
>> during our selecting. But be captious costs too much.
>
> No, we should not do anything like this without first integrating
> cpuidle.
>
> At which point we have a sane view of the idle states and can make a
> sane choice between them.
>
Daniel,
Any comments to make it better?
--
Thanks
Alex
next prev parent reply other threads:[~2014-01-15 14:38 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 4:07 [RFC PATCH] sched: find the latest idle cpu Alex Shi
2014-01-15 4:31 ` Michael wang
2014-01-15 4:48 ` Alex Shi
2014-01-15 4:53 ` Alex Shi
2014-01-15 5:06 ` Alex Shi
2014-01-15 5:33 ` Michael wang
2014-01-15 6:45 ` Alex Shi
2014-01-15 8:05 ` Michael wang
2014-01-15 14:28 ` Alex Shi
2014-01-15 7:35 ` Peter Zijlstra
2014-01-15 14:37 ` Alex Shi [this message]
2014-01-16 11:03 ` Daniel Lezcano
2014-01-16 11:38 ` Peter Zijlstra
2014-01-16 12:16 ` Daniel Lezcano
2014-01-17 2:40 ` Nicolas Pitre
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