linux-kernel - Re: [PATCH V4 3/4] block: queue work on unbound wq

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Message-ID: <20130423202429.GK12543@htj.dyndns.org>
Date:	Tue, 23 Apr 2013 13:24:29 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
Cc:	linaro-kernel@...ts.linaro.org, patches@...aro.org,
	robin.randhawa@....com, Steve.Bannister@....com,
	Liviu.Dudau@....com, charles.garcia-tobin@....com,
	arvind.chauhan@....com, davem@...emloft.net, airlied@...hat.com,
	axboe@...nel.dk, tglx@...utronix.de, peterz@...radead.org,
	mingo@...hat.com, rostedt@...dmis.org,
	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 3/4] block: queue work on unbound wq

Hello, Viresh.

On Mon, Apr 22, 2013 at 11:50:04AM +0530, Viresh Kumar wrote:
> On 10 April 2013 00:00, Tejun Heo <tj@...nel.org> wrote:
> > On Tue, Apr 09, 2013 at 01:00:59PM +0530, Viresh Kumar wrote:
> 
> >> +#ifdef CONFIG_WQ_POWER_EFFICIENT
> >> +static bool wq_power_efficient = 0;
> >> +module_param_named(power_efficient, wq_power_efficient, bool, 0444);
> >> +#endif
> >
> > I don't think we need to make the whole thing configurable.  Turning
> > it off isn't gonna save much - my gut tells me it's gonna be four
> > instructions. :)
> >
> > What I meant was that the default value for the parameter would
> > probably be need to be configurable so that mobile people don't have
> > to include the kernel param all the time or patch the kernel
> > themselves.
> 
> I didn't get it completely.. Are you asking to set the default value
> to 1 instead
> to keep it enabled by default if config option is selected?

Oh, sorry about that.  I meant something like this.

  #ifdef CONFIG_WQ_POWER_EFFICIENT_BY_DEFAULT // or something prettier
  static bool wq_power_efficient = true;
  #else
  static bool wq_power_efficient = false;
  #endif

  module_param....

And its Kconfig entry

  config WQ_POWER_EFFICIENT_BY_DEFAULT
	bool "Blah Blah Viresh is awesome"
	default n

Thanks!

-- 
tejun
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