diff mbox

[3/5] x86,idle: Reset correction factor

Message ID 1350435880-19143-4-git-send-email-youquan.song@intel.com (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Youquan Song Oct. 17, 2012, 1:04 a.m. UTC 
In general case, the expected residency is much larger than deepest C-state
target residency, but prediction logic still predicts the small predicted
residency, so the prediction history is totally broken. In this situation,
reset the correction factor is the only choice.

Signed-off-by: Youquan Song <youquan.song@intel.com>
Signed-off-by: Rik van Riel <riel@redhat.com>
---
 drivers/cpuidle/governors/menu.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
diff mbox

Patch

diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index b34bf11..7dbac97 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -221,6 +221,10 @@  EXPORT_SYMBOL_GPL(menu_hrtimer_cancel);
 static enum hrtimer_restart menu_hrtimer_notify(struct hrtimer *hrtimer)
 {
 	int cpu = smp_processor_id();
+	struct menu_device *data = &per_cpu(menu_devices, cpu);
+
+	if (per_cpu(hrtimer_started, cpu) == 2)
+		data->correction_factor[data->bucket] = RESOLUTION * DECAY;
 
 	per_cpu(hrtimer_started, cpu) = 0;
 
@@ -386,7 +390,7 @@  static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
 			hrtimer_start(hrtmr, ns_to_ktime(1000 * timer_us),
 				HRTIMER_MODE_REL_PINNED);
 			/* menu hrtimer is started */
-			per_cpu(hrtimer_started, cpu) = 1;
+			per_cpu(hrtimer_started, cpu) = 2;
 		}
 
 	}