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sched/fair: Honor sync only if CPU is about to goto idle

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sync is causing excessive latencies during binder replies as its causing
migration of important tasks to busy CPU. Incase the CPU has a lot of
tasks running, prevent sync from happening

Based on: 3944217bbb

Change-Id: I2077bf11dccc9ae1f68ac1363b06a5d200e385da
Signed-off-by: Zachariah Kennedy <zkennedy87@gmail.com>
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
Signed-off-by: Yaroslav Furman <yaro330@gmail.com>
Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
This commit is contained in:
Zachariah Kennedy 2019-10-14 14:02:22 +00:00 committed by Richard Raya
parent d34e463b5b
commit 4b4d128ca8
1 changed files with 2 additions and 1 deletions
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3
kernel/sched/fair.c
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@ -8377,6 +8377,7 @@ static int find_energy_efficient_cpu(struct sched_domain *sd,
u64 start_t = 0;
int next_cpu = -1, backup_cpu = -1;
int boosted = (schedtune_task_boost(p) > 0 || per_task_boost(p) > 0);
bool about_to_idle = (cpu_rq(cpu)->nr_running < 2);
fbt_env.fastpath = 0;
fbt_env.need_idle = 0;
@ -8387,7 +8388,7 @@ static int find_energy_efficient_cpu(struct sched_domain *sd,
if (need_idle)
sync = 0;
if (sysctl_sched_sync_hint_enable && sync &&
if (sysctl_sched_sync_hint_enable && sync && about_to_idle &&
bias_to_this_cpu(p, cpu, rtg_target)) {
target_cpu = cpu;
fbt_env.fastpath = SYNC_WAKEUP;