Re: [PATCH V5 1/5] workqueues: Introduce new flag WQ_POWER_EFFICIENTfor power oriented workqueues

From: Viresh Kumar
Date: Thu Apr 25 2013 - 07:15:30 EST

On 25 April 2013 16:43, Amit Kucheria <amit.kucheria@xxxxxxxxxx> wrote:
> On Thu, Apr 25, 2013 at 9:13 AM, Viresh Kumar <viresh.kumar@xxxxxxxxxx> wrote:
>> On 25 April 2013 09:00, Amit Kucheria <amit.kucheria@xxxxxxxxxx> 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@xxxxxxxxxx>
>> 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@xxxxxxxxxx>
> For the series, you can add my:
> Reviewed-by: Amit Kucheria <amit.kucheria@xxxxxxxxxx>

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