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authorYouquan Song <youquan.song@intel.com>2012-10-26 12:27:07 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2012-11-15 00:34:20 +0100
commitc96ca4fb76b711279be063da083f09b8d65af5c5 (patch)
tree391f775fd069d79bd8aa1586c6b5ed848b7f5ee5 /drivers/cpuidle
parentd73d68dc49e09143e8e3bef10670a021c26ec4a5 (diff)
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cpuidle: Get typical recent sleep interval
The function detect_repeating_patterns was not very useful for workloads with alternating long and short pauses, for example virtual machines handling network requests for each other (say a web and database server). Instead, try to find a recent sleep interval that is somewhere between the median and the mode sleep time, by discarding outliers to the up side and recalculating the average and standard deviation until that is no longer required. This should do something sane with a sleep interval series like: 200 180 210 10000 30 1000 170 200 The current code would simply discard such a series, while the new code will guess a typical sleep interval just shy of 200. The original patch come from Rik van Riel <riel@redhat.com>. 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/governors/menu.c69
1 files changed, 46 insertions, 23 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c
index 43a54fd6bfa..2efee27714a 100644
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -245,36 +245,59 @@ static enum hrtimer_restart menu_hrtimer_notify(struct hrtimer *hrtimer)
* of points is below a threshold. If it is... then use the
* average of these 8 points as the estimated value.
*/
-static int detect_repeating_patterns(struct menu_device *data)
+static u32 get_typical_interval(struct menu_device *data)
{
- int i;
- uint64_t avg = 0;
- uint64_t stddev = 0; /* contains the square of the std deviation */
- int ret = 0;
-
- /* first calculate average and standard deviation of the past */
- for (i = 0; i < INTERVALS; i++)
- avg += data->intervals[i];
- avg = avg / INTERVALS;
+ int i = 0, divisor = 0;
+ uint64_t max = 0, avg = 0, stddev = 0;
+ int64_t thresh = LLONG_MAX; /* Discard outliers above this value. */
+ unsigned int ret = 0;
- /* if the avg is beyond the known next tick, it's worthless */
- if (avg > data->expected_us)
- return 0;
-
- for (i = 0; i < INTERVALS; i++)
- stddev += (data->intervals[i] - avg) *
- (data->intervals[i] - avg);
+again:
- stddev = stddev / INTERVALS;
+ /* first calculate average and standard deviation of the past */
+ max = avg = divisor = stddev = 0;
+ for (i = 0; i < INTERVALS; i++) {
+ int64_t value = data->intervals[i];
+ if (value <= thresh) {
+ avg += value;
+ divisor++;
+ if (value > max)
+ max = value;
+ }
+ }
+ do_div(avg, divisor);
+ for (i = 0; i < INTERVALS; i++) {
+ int64_t value = data->intervals[i];
+ if (value <= thresh) {
+ int64_t diff = value - avg;
+ stddev += diff * diff;
+ }
+ }
+ do_div(stddev, divisor);
+ stddev = int_sqrt(stddev);
/*
- * now.. if stddev is small.. then assume we have a
- * repeating pattern and predict we keep doing this.
+ * If we have outliers to the upside in our distribution, discard
+ * those by setting the threshold to exclude these outliers, then
+ * calculate the average and standard deviation again. Once we get
+ * down to the bottom 3/4 of our samples, stop excluding samples.
+ *
+ * This can deal with workloads that have long pauses interspersed
+ * with sporadic activity with a bunch of short pauses.
+ *
+ * The typical interval is obtained when standard deviation is small
+ * or standard deviation is small compared to the average interval.
*/
-
- if (avg && stddev < STDDEV_THRESH) {
+ if (((avg > stddev * 6) && (divisor * 4 >= INTERVALS * 3))
+ || stddev <= 20) {
data->predicted_us = avg;
ret = 1;
+ return ret;
+
+ } else if ((divisor * 4) > INTERVALS * 3) {
+ /* Exclude the max interval */
+ thresh = max - 1;
+ goto again;
}
return ret;
@@ -330,7 +353,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
data->predicted_us = div_round64(data->expected_us * data->correction_factor[data->bucket],
RESOLUTION * DECAY);
- repeat = detect_repeating_patterns(data);
+ repeat = get_typical_interval(data);
/*
* We want to default to C1 (hlt), not to busy polling