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Date: Thu, 25 Apr 2013 16:45:23 +0530
Message-ID: <CAKohpokU6bkHrWN3ZYQs1SRkyjZwM-hZLzxd-4Ea93gYKZ+u7w@mail.gmail.com>
Subject: Re: [PATCH V5 1/5] workqueues: Introduce new flag WQ_POWER_EFFICIENT
 for power oriented workqueues
From: Viresh Kumar <viresh.kumar@linaro.org>
To: Amit Kucheria <amit.kucheria@linaro.org>
Cc: Tejun Heo <tj@kernel.org>, davem@davemloft.net,
        linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org,
        Robin Randhawa <robin.randhawa@arm.com>,
        Charles Garcia-Tobin <charles.garcia-tobin@arm.com>,
        Steve Bannister <Steve.Bannister@arm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Arvind Chauhan <arvind.chauhan@arm.com>,
        Patch Tracking <patches@linaro.org>, airlied@redhat.com,
        mingo@redhat.com, Jens Axboe <axboe@kernel.dk>,
        Liviu Dudau <Liviu.Dudau@arm.com>,
        Lists linaro-kernel <linaro-kernel@lists.linaro.org>
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On 25 April 2013 16:43, Amit Kucheria <amit.kucheria@linaro.org> wrote:
> On Thu, Apr 25, 2013 at 9:13 AM, Viresh Kumar <viresh.kumar@linaro.org> wrote:
>> On 25 April 2013 09:00, Amit Kucheria <amit.kucheria@linaro.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@linaro.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@linaro.org>
>
> For the series, you can add my:
>
> Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>

Thanks.
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