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authorYouquan Song <youquan.song@intel.com>2012-10-26 12:26:59 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:34:20 +0100
commitd73d68dc49e09143e8e3bef10670a021c26ec4a5 (patch)
tree1efde05ffcfcbe38ac3cb6900c8f01b70d0ec066 /drivers/cpuidle
parente11538d1f03914eb92af5a1a378375c05ae8520c (diff)
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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: 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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index f4b8fc50c0f2..ce4cac706dd1 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -144,6 +144,10 @@ 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;
}