diff options
| author | Sai Gurrappadi <sgurrappadi@nvidia.com> | 2014-01-21 16:41:37 -0800 |
|---|---|---|
| committer | Diwakar Tundlam <dtundlam@nvidia.com> | 2014-03-03 19:38:54 -0800 |
| commit | 3bfdbefc2cf0ecf2933250813c356b3d147e59e0 (patch) | |
| tree | de830b9368a6ac8b3788fbb47054b7633771c8a0 /kernel/sched/sched.h | |
| parent | 33db1f7eb8e2d9eaad2dce65152cd5b2a4a27fae (diff) | |
sched: Force sleep on consecutive sched_yields
If a task sched_yields to itself continuously, force the task to
sleep in sched_yield. This will lower the CPU load of this task
thereby lowering the cpu frequency and improving power.
Added a stat variable to track how many times we sleep due these
consecutive sched_yields. Also added sysctl knobs to control the number
of consecutive sched_yields before which the sleep kicks in and the
duration fo the sleep in us.
Bug 1424617
Change-Id: Ie92412b8b900365816e17237fcbd0aac6e9c94ce
Signed-off-by: Sai Gurrappadi <sgurrappadi@nvidia.com>
Reviewed-on: http://git-master/r/358455
Reviewed-by: Wen Yi <wyi@nvidia.com>
Reviewed-by: Peter Zu <pzu@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Diwakar Tundlam <dtundlam@nvidia.com>
Diffstat (limited to 'kernel/sched/sched.h')
| -rw-r--r-- | kernel/sched/sched.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 35bd8b7f3a87..0fc275c70d7d 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -511,6 +511,7 @@ struct rq { /* sys_sched_yield() stats */ unsigned int yld_count; + unsigned int yield_sleep_count; /* schedule() stats */ unsigned int sched_count; @@ -1143,6 +1144,8 @@ extern void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags); extern const_debug unsigned int sysctl_sched_time_avg; extern const_debug unsigned int sysctl_sched_nr_migrate; extern const_debug unsigned int sysctl_sched_migration_cost; +extern const_debug unsigned int sysctl_sched_yield_sleep_duration; +extern const_debug int sysctl_sched_yield_sleep_threshold; static inline u64 sched_avg_period(void) { |