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path: root/drivers/cpuidle/governors/menu.c
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Diffstat (limited to 'drivers/cpuidle/governors/menu.c')
-rw-r--r--drivers/cpuidle/governors/menu.c27
1 files changed, 16 insertions, 11 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 22e4463d1..0742b3296 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -294,8 +294,6 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
data->needs_update = 0;
}
- data->last_state_idx = CPUIDLE_DRIVER_STATE_START - 1;
-
/* Special case when user has set very strict latency requirement */
if (unlikely(latency_req == 0))
return 0;
@@ -326,20 +324,25 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
if (latency_req > interactivity_req)
latency_req = interactivity_req;
- /*
- * We want to default to C1 (hlt), not to busy polling
- * unless the timer is happening really really soon.
- */
- if (data->next_timer_us > 5 &&
- !drv->states[CPUIDLE_DRIVER_STATE_START].disabled &&
- dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
+ if (CPUIDLE_DRIVER_STATE_START > 0) {
+ data->last_state_idx = CPUIDLE_DRIVER_STATE_START - 1;
+ /*
+ * We want to default to C1 (hlt), not to busy polling
+ * unless the timer is happening really really soon.
+ */
+ if (interactivity_req > 20 &&
+ !drv->states[CPUIDLE_DRIVER_STATE_START].disabled &&
+ dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0)
+ data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
+ } else {
data->last_state_idx = CPUIDLE_DRIVER_STATE_START;
+ }
/*
* Find the idle state with the lowest power while satisfying
* our constraints.
*/
- for (i = CPUIDLE_DRIVER_STATE_START; i < drv->state_count; i++) {
+ for (i = data->last_state_idx + 1; i < drv->state_count; i++) {
struct cpuidle_state *s = &drv->states[i];
struct cpuidle_state_usage *su = &dev->states_usage[i];
@@ -404,8 +407,10 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev)
measured_us = cpuidle_get_last_residency(dev);
/* Deduct exit latency */
- if (measured_us > target->exit_latency)
+ if (measured_us > 2 * target->exit_latency)
measured_us -= target->exit_latency;
+ else
+ measured_us /= 2;
/* Make sure our coefficients do not exceed unity */
if (measured_us > data->next_timer_us)