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cpuidle: Set residency to 0 if target Cstate not enter

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When cpuidle governor choose a C-state to enter for idle CPU, but it notice that
there is tasks request to be executed. So the idle CPU will not really enter
the target C-state and go to run task.

In this situation, it will use the residency of previous really entered target
C-states. Obviously, it is not reasonable.

So, this patch fix it by set the target C-state residency to 0.

Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Youquan Song <youquan.song@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Youquan Song 2012-10-26 12:26:59 +02:00 • committed by Rafael J. Wysocki
parent e11538d1f0
commit d73d68dc49
1 changed files with 4 additions and 0 deletions
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4
drivers/cpuidle/cpuidle.c
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@ -144,6 +144,10 @@ int cpuidle_idle_call(void)
/* ask the governor for the next state */ /* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(drv, dev); next_state = cpuidle_curr_governor->select(drv, dev);
if (need_resched()) { if (need_resched()) {
dev->last_residency = 0;
/* give the governor an opportunity to reflect on the outcome */
if (cpuidle_curr_governor->reflect)
cpuidle_curr_governor->reflect(dev, next_state);
local_irq_enable(); local_irq_enable();
return 0; return 0;
} }