diff options
| author | Joseph Lo <josephl@nvidia.com> | 2013-04-22 14:39:18 +0800 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2016-08-10 15:01:22 -0700 |
| commit | 3a400abdc57e047786d0b35d39617a794e2bb97e (patch) | |
| tree | cec02b562a3a17e89ff6e2d1f6b75dbbc7462e17 /include/linux | |
| parent | fed95d9ef1b2674c4a2cda8b2445ca7ef3f6ca59 (diff) | |
CHROMIUM: sched: update the average of nr_running
Doing a Exponential moving average per nr_running++/-- does not
guarantee a fixed sample rate which induces errors if there are lots of
threads being enqueued/dequeued from the rq (Linpack mt). Instead of
keeping track of the avg, the scheduler now keeps track of the integral
of nr_running and allows the readers to perform filtering on top.
Original-author: Sai Charan Gurrappadi <sgurrappadi@nvidia.com>
Change-Id: Id946654f32fa8be0eaf9d8fa7c9a8039b5ef9fab
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/174694
Reviewed-on: https://chromium-review.googlesource.com/272853
[jstultz: fwdported to 4.4]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index b9b11b2dbabd..ee59abcab30d 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -173,6 +173,9 @@ extern bool single_task_running(void); extern unsigned long nr_iowait(void); extern unsigned long nr_iowait_cpu(int cpu); extern void get_iowait_load(unsigned long *nr_waiters, unsigned long *load); +#ifdef CONFIG_CPU_QUIET +extern u64 nr_running_integral(unsigned int cpu); +#endif extern void calc_global_load(unsigned long ticks); |