diff options
| author | Youquan Song <youquan.song@intel.com> | 2012-10-26 12:26:59 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2012-11-15 00:34:20 +0100 |
| commit | d73d68dc49e09143e8e3bef10670a021c26ec4a5 (patch) | |
| tree | 1efde05ffcfcbe38ac3cb6900c8f01b70d0ec066 /drivers/cpuidle | |
| parent | cpuidle: Quickly notice prediction failure in general case (diff) | |
| download | linux-d73d68dc49e09143e8e3bef10670a021c26ec4a5.tar.xz linux-d73d68dc49e09143e8e3bef10670a021c26ec4a5.zip | |
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.c | 4 |
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; } |