diff options
| author | Tuukka Tikkanen <tuukka.tikkanen@linaro.org> | 2013-08-14 18:02:35 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-08-23 00:24:15 +0200 |
| commit | 017099e25fb7e482a249d36a654556d32f601f71 (patch) | |
| tree | 95b96aff280b3e55cbd8b93e445925d25974366b /drivers/cpuidle | |
| parent | cpuidle: Ignore interval prediction result when timer is shorter (diff) | |
| download | linux-017099e25fb7e482a249d36a654556d32f601f71.tar.xz linux-017099e25fb7e482a249d36a654556d32f601f71.zip | |
cpuidle: Rearrange code and comments in get_typical_interval()
This patch rearranges a if-return-elsif-goto-fi-return sequence into
if-return-fi-if-return-fi-goto sequence. The functionality remains the
same. Also, a lengthy comment that did not describe the functionality
in the order it occurs is split into half and top half is moved closer
to actual implementation it describes.
Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/governors/menu.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index 351697305fe7..f1fadbecfa1b 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -228,14 +228,6 @@ again: do_div(stddev, divisor); stddev = int_sqrt(stddev); /* - * 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. * @@ -246,12 +238,22 @@ again: if (data->expected_us > avg) data->predicted_us = avg; return; - - } else if ((divisor * 4) > INTERVALS * 3) { - /* Exclude the max interval */ - thresh = max - 1; - goto again; } + + /* + * 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. + */ + if ((divisor * 4) <= INTERVALS * 3) + return; + + thresh = max - 1; + goto again; } /** |