From a81d32264721fcb29e54d981fe17519cef600d78 Mon Sep 17 00:00:00 2001 From: Joel Fernandes Date: Mon, 11 Sep 2017 17:10:37 -0700 Subject: ANDROID: sched/rt: schedtune: Add boost retention to RT Boosted RT tasks can be deboosted quickly, this makes boost usless for RT tasks and causes lots of glitching. Use timers to prevent de-boost too soon and wait for long enough such that next enqueue happens after a threshold. While this can be solved in the governor, there are following advantages: - The approach used is governor-independent - Reduces boost group lock contention for frequently sleepers/wakers Note: Fixed build breakage due to schedfreq dependency which isn't used for RT anymore. Bug: 30210506 Change-Id: I428a2695cac06cc3458cdde0dea72315e4e66c00 Signed-off-by: Joel Fernandes --- include/linux/sched.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux') diff --git a/include/linux/sched.h b/include/linux/sched.h index 4645017c6a24..d3dd0d516957 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1434,6 +1434,10 @@ struct sched_rt_entity { unsigned long watchdog_stamp; unsigned int time_slice; + /* Accesses for these must be guarded by rq->lock of the task's rq */ + bool schedtune_enqueued; + struct hrtimer schedtune_timer; + struct sched_rt_entity *back; #ifdef CONFIG_RT_GROUP_SCHED struct sched_rt_entity *parent; -- cgit v1.2.3