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cpuidle: Add decaying history logic to menu idle predictor 

Add decaying history of predicted idle time, instead of using the last early
wakeup. This logic helps menu governor do better job of predicting idle time.

With this change, we also measured noticable (~8%) power savings on
a DP server system with CPUs supporting deep C states, when system
was lightly loaded. There was no change to power or perf on other load
conditions.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Pallipadi, Venkatesh 2008-12-30 14:46:02 -08:00 committed by Len Brown
parent 4a6908a3a0
commit 816bb611e4
1 changed files with 9 additions and 1 deletions
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10
drivers/cpuidle/governors/menu.c
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@ -15,12 +15,14 @@
#include <linux/tick.h>
#define BREAK_FUZZ 4 /* 4 us */
#define PRED_HISTORY_PCT 50
struct menu_device {
int last_state_idx;
unsigned int expected_us;
unsigned int predicted_us;
unsigned int current_predicted_us;
unsigned int last_measured_us;
unsigned int elapsed_us;
};
@ -47,6 +49,12 @@ static int menu_select(struct cpuidle_device *dev)
data->expected_us =
(u32) ktime_to_ns(tick_nohz_get_sleep_length()) / 1000;
/* Recalculate predicted_us based on prediction_history_pct */
data->predicted_us *= PRED_HISTORY_PCT;
data->predicted_us += (100 - PRED_HISTORY_PCT) *
data->current_predicted_us;
data->predicted_us /= 100;
/* find the deepest idle state that satisfies our constraints */
for (i = CPUIDLE_DRIVER_STATE_START + 1; i < dev->state_count; i++) {
struct cpuidle_state *s = &dev->states[i];
@ -97,7 +105,7 @@ static void menu_reflect(struct cpuidle_device *dev)
measured_us = -1;
/* Predict time until next break event */
data->predicted_us = max(measured_us, data->last_measured_us);
data->current_predicted_us = max(measured_us, data->last_measured_us);
if (last_idle_us + BREAK_FUZZ <
data->expected_us - target->exit_latency) {