youquan.song at intel
May 10, 2012, 8:20 PM
Post #1 of 1
(33 views)
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[PATCH 3/3] x86,idle: Set residency to 0 if target Cstate not really 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: Youquan Song <youquan.song [at] intel>
---
drivers/cpuidle/cpuidle.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 2f0083a..7992417 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -136,6 +136,10 @@ int cpuidle_idle_call(void)
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(drv, dev);
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();
return 0;
}
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