From: Wang Qing <wangqing@vivo.com>

Util_avg is greater than util_est means there is a sudden increase in
tasks at this time, we should give it an increment to make load balancing
faster.

Signed-off-by: Wang Qing <wangqing@vivo.com>
---
v2:
- modify the return value if UTIL_EST_BOOST is false
---
 kernel/sched/fair.c     | 8 +++++++-
 kernel/sched/features.h | 1 +
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 265bf7a75a37..2fcda7972057 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4036,7 +4036,13 @@ static inline unsigned long _task_util_est(struct task_struct *p)
 
 static inline unsigned long task_util_est(struct task_struct *p)
 {
-	return max(task_util(p), _task_util_est(p));
+	unsigned long util_avg = task_util(p);
+	unsigned long util_est = _task_util_est(p);
+
+	if (sched_feat(UTIL_EST_BOOST) && util_est && util_avg > util_est)
+		return util_avg + (util_avg - util_est)/2;
+	else
+		return max(util_avg, util_est);
 }
 
 #ifdef CONFIG_UCLAMP_TASK
diff --git a/kernel/sched/features.h b/kernel/sched/features.h
index 1cf435bbcd9c..c73a898e7e38 100644
--- a/kernel/sched/features.h
+++ b/kernel/sched/features.h
@@ -95,6 +95,7 @@ SCHED_FEAT(WA_BIAS, true)
  */
 SCHED_FEAT(UTIL_EST, true)
 SCHED_FEAT(UTIL_EST_FASTUP, true)
+SCHED_FEAT(UTIL_EST_BOOST, false)
 
 SCHED_FEAT(LATENCY_WARN, false)
 
-- 
2.27.0.windows.1

This patch is the simple implementation part of
"Improving responsiveness of interactive CFS tasks using util_est" by
Vincent. 

I would like to ask for your comments.

Thanks,
Qing


>From: Wang Qing <wangqing@vivo.com>
>
>Util_avg is greater than util_est means there is a sudden increase in
>tasks at this time, we should give it an increment to make load balancing
>faster.
>
>Signed-off-by: Wang Qing <wangqing@vivo.com>
>---
>v2:
>- modify the return value if UTIL_EST_BOOST is false
>---
> kernel/sched/fair.c     | 8 +++++++-
> kernel/sched/features.h | 1 +
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
>diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>index 265bf7a75a37..2fcda7972057 100644
>--- a/kernel/sched/fair.c
>+++ b/kernel/sched/fair.c
>@@ -4036,7 +4036,13 @@ static inline unsigned long _task_util_est(struct task_struct *p)
> 
> static inline unsigned long task_util_est(struct task_struct *p)
> {
>-       return max(task_util(p), _task_util_est(p));
>+       unsigned long util_avg = task_util(p);
>+       unsigned long util_est = _task_util_est(p);
>+
>+       if (sched_feat(UTIL_EST_BOOST) && util_est && util_avg > util_est)
>+               return util_avg + (util_avg - util_est)/2;
>+       else
>+               return max(util_avg, util_est);
> }
> 
> #ifdef CONFIG_UCLAMP_TASK
>diff --git a/kernel/sched/features.h b/kernel/sched/features.h
>index 1cf435bbcd9c..c73a898e7e38 100644
>--- a/kernel/sched/features.h
>+++ b/kernel/sched/features.h
>@@ -95,6 +95,7 @@ SCHED_FEAT(WA_BIAS, true)
>  */
> SCHED_FEAT(UTIL_EST, true)
> SCHED_FEAT(UTIL_EST_FASTUP, true)
>+SCHED_FEAT(UTIL_EST_BOOST, false)
> 
> SCHED_FEAT(LATENCY_WARN, false)
> 
>-- 
>2.7.4