linux-kernel - Re: [PATCH] cpuidle: governor: menu: move repeated correction factor check to init

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Message-ID: <2942005.cg9fS5oSJO@vostro.rjw.lan>
Date:	Tue, 22 Apr 2014 13:24:21 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Chander Kashyap <chander.kashyap@...aro.org>
Cc:	Tuukka Tikkanen <tuukka.tikkanen@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rafael.j.wysocki@...el.com,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org
Subject: Re: [PATCH] cpuidle: governor: menu: move repeated correction factor check to init

On Tuesday, April 22, 2014 03:24:21 PM Chander Kashyap wrote:
> +cc
> linux-pm@...r.kernel.org.

And can you please resend the patch?  So that it shows up in Patchwork,
for example?


> On 22 April 2014 15:33, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> > On Tuesday, April 22, 2014 08:27:53 AM Chander Kashyap wrote:
> >> ping
> >
> > Please CC cpuidle patches to linux-pm@...r.kernel.org.
> 
> +cc to linux-pm@...r.kernel.org.
> Thanks Rafael
> 
> >
> > Thanks!
> >
> >> On 10 April 2014 19:57, Tuukka Tikkanen <tuukka.tikkanen@...aro.org> wrote:
> >> > On 10 April 2014 16:43, Chander Kashyap <chander.kashyap@...aro.org> wrote:
> >> >> In menu_select function we check for correction factor every time.
> >> >> If it is zero we are initializing to unity. Hence move it to init function
> >> >> and initialise by unity, hence avoid repeated comparisons.
> >> >>
> >> >> Signed-off-by: Chander Kashyap <chander.kashyap@...aro.org>
> >> >> ---
> >> >>  drivers/cpuidle/governors/menu.c |   15 ++++++++-------
> >> >>  1 file changed, 8 insertions(+), 7 deletions(-)
> >> >>
> >> >> diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
> >> >> index cf7f2f0..048f6d9 100644
> >> >> --- a/drivers/cpuidle/governors/menu.c
> >> >> +++ b/drivers/cpuidle/governors/menu.c
> >> >> @@ -315,13 +315,6 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
> >> >>         multiplier = performance_multiplier();
> >> >>
> >> >>         /*
> >> >> -        * if the correction factor is 0 (eg first time init or cpu hotplug
> >> >> -        * etc), we actually want to start out with a unity factor.
> >> >> -        */
> >> >> -       if (data->correction_factor[data->bucket] == 0)
> >> >> -               data->correction_factor[data->bucket] = RESOLUTION * DECAY;
> >> >> -
> >> >> -       /*
> >> >>          * Force the result of multiplication to be 64 bits even if both
> >> >>          * operands are 32 bits.
> >> >>          * Make sure to round up for half microseconds.
> >> >> @@ -453,9 +446,17 @@ static int menu_enable_device(struct cpuidle_driver *drv,
> >> >>                                 struct cpuidle_device *dev)
> >> >>  {
> >> >>         struct menu_device *data = &per_cpu(menu_devices, dev->cpu);
> >> >> +       int i;
> >> >>
> >> >>         memset(data, 0, sizeof(struct menu_device));
> >> >>
> >> >> +       /*
> >> >> +        * if the correction factor is 0 (eg first time init or cpu hotplug
> >> >> +        * etc), we actually want to start out with a unity factor.
> >> >> +        */
> >> >> +       for(i = 0; i < BUCKETS; i++)
> >> >> +               data->correction_factor[i] = RESOLUTION * DECAY;
> >> >> +
> >> >>         return 0;
> >> >>  }
> >> >>
> >> >> --
> >> >> 1.7.9.5
> >> >>
> >> >
> >> > Reviewed-by: Tuukka Tikkanen <tuukka.tikkanen@...aro.org>
> >>
> >>
> >>
> >>
> >
> > --
> > I speak only for myself.
> > Rafael J. Wysocki, Intel Open Source Technology Center.
> 
> 
> 
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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