linux-kernel - Re: [PATCH V5 1/5] workqueues: Introduce new flag WQ_POWER

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Date:	Thu, 25 Apr 2013 16:45:23 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Amit Kucheria <amit.kucheria@...aro.org>
Cc:	Tejun Heo <tj@...nel.org>, davem@...emloft.net,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robin Randhawa <robin.randhawa@....com>,
	Charles Garcia-Tobin <charles.garcia-tobin@....com>,
	Steve Bannister <Steve.Bannister@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arvind Chauhan <arvind.chauhan@....com>,
	Patch Tracking <patches@...aro.org>, airlied@...hat.com,
	mingo@...hat.com, Jens Axboe <axboe@...nel.dk>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>
Subject: Re: [PATCH V5 1/5] workqueues: Introduce new flag WQ_POWER_EFFICIENT
 for power oriented workqueues

On 25 April 2013 16:43, Amit Kucheria <amit.kucheria@...aro.org> wrote:
> On Thu, Apr 25, 2013 at 9:13 AM, Viresh Kumar <viresh.kumar@...aro.org> wrote:
>> On 25 April 2013 09:00, Amit Kucheria <amit.kucheria@...aro.org> wrote:
>>> Yes. That was my intention - preventing a prompt on existing defconfigs and
>>> there by maintaining current behavior.
>>
>> Hmm... Following is the version after fixing all problems you reported.
>> @Tejun: I have attached it too as gmail's copy-paste may break it. Please
>> consider applying this series if it looks fine to you.
>>
>>
>> ---------------x----------------x---------------------
>>
>> From: Viresh Kumar <viresh.kumar@...aro.org>
>> Date: Mon, 8 Apr 2013 16:45:40 +0530
>> Subject: [PATCH V5 1/5] workqueues: Introduce new flag WQ_POWER_EFFICIENT for
>>  power oriented workqueues
>>
>> Workqueues can be performance or power-oriented. Currently, most workqueues are
>> bound to the CPU they were created on. This gives good performance (due to cache
>> effects) at the cost of potentially waking up otherwise idle cores just to
>> process some work. To save power, we can allow the work to be rescheduled on a
>> core that is already awake.
>>
>> Workqueues created with the WQ_UNBOUND flag will allow some power savings.
>> However, we don't change the default behaviour of the system.  To enable
>> power-saving behaviour, a new config option CONFIG_WQ_POWER_EFFICIENT needs to
>> be turned on. This option can also be overridden by the
>> workqueue.power_efficient boot parameter.
>>
>> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
>
> For the series, you can add my:
>
> Reviewed-by: Amit Kucheria <amit.kucheria@...aro.org>

Thanks.
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