Commit d73d68dc authored by Youquan Song's avatar Youquan Song Committed by Rafael J. Wysocki

cpuidle: Set residency to 0 if target Cstate not enter

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: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarYouquan Song <youquan.song@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e11538d1
...@@ -144,6 +144,10 @@ int cpuidle_idle_call(void) ...@@ -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;
} }
......
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