linux-kernel - Re: [PATCH 18/21] cpuidle: don't call poll_idle

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Date:	Thu, 03 Oct 2013 13:46:33 +0200
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>
CC:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Lists linaro-kernel <linaro-kernel@...ts.linaro.org>,
	Patch Tracking <patches@...aro.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 18/21] cpuidle: don't call poll_idle_init() for every
 cpu

On 10/03/2013 12:33 PM, Viresh Kumar wrote:
> On 26 September 2013 13:58, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>> Yes, certainly and that will impact also the menu select governor function:
>>
>>   ...
>>
>>          /*
>>           * We want to default to C1 (hlt), not to busy polling
>>           * unless the timer is happening really really soon.
>>           */
>>          if (data->expected_us > 5 &&
>>              !drv->states[CPUIDLE_DRIVER_STATE_START].disabled &&
>>                  dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
>>                  data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
>>
>>          /*
>>           * Find the idle state with the lowest power while satisfying
>>           * our constraints.
>>           */
>>          for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
>>                  struct cpuidle_state *s = &drv->states[i];
>>                  struct cpuidle_state_usage *su = &dev->states_usage[i];
>>
>>                  if (s->disabled || su->disable)
>>                          continue;
>>                  if (s->target_residency > data->predicted_us)
>>                          continue;
>>                  if (s->exit_latency > latency_req)
>>                          continue;
>>                  if (s->exit_latency * multiplier > data->predicted_us)
>>                          continue;
>>
>>                  data->last_state_idx = i;
>>                  data->exit_us = s->exit_latency;
>>          }
>
> Hmm.. For now I will repost this patch as is and then you can go ahead
> for this bigger change.. I wouldn't be able to do this change now, as I
> would be rushing for my 2 weeks vacations :)
>
> If this patch looked okay to you, can you please Ack it ?

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>


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