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ANDROID: sched/fair: unlink misfit from cpu overutilized

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Partially applies patch from Vincent Guittot

	e5ed0550c0: ("sched/fair: unlink misfit task from cpu overutilized")

The full patch improves the search logic under thermal pressure, but
it's a bit intrusive to fully backport. We are interested in the part
that unlinks misfit from overutilized only.

Bug: 283975667
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: I2ae21499b846d13d3889f8cacdb70652817b066f
This commit is contained in:
Qais Yousef
2023-02-08 18:17:04 +00:00
committed by Todd Kjos
parent a393cfd70d
commit 858f6f1541
1 changed files with 12 additions and 11 deletions
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23
kernel/sched/fair.c
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@@ -9963,6 +9963,16 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
*/
update_sd_lb_stats(env, &sds);
/* There is no busy sibling group to pull tasks from */
if (!sds.busiest)
goto out_balanced;
busiest = &sds.busiest_stat;
/* Misfit tasks should be dealt with regardless of the avg load */
if (busiest->group_type == group_misfit_task)
goto force_balance;
if (sched_energy_enabled()) {
struct root_domain *rd = env->dst_rq->rd;
int out_balance = 1;
@@ -9974,17 +9984,6 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
goto out_balanced;
}
local = &sds.local_stat;
busiest = &sds.busiest_stat;
/* There is no busy sibling group to pull tasks from */
if (!sds.busiest)
goto out_balanced;
/* Misfit tasks should be dealt with regardless of the avg load */
if (busiest->group_type == group_misfit_task)
goto force_balance;
/* ASYM feature bypasses nice load balance check */
if (busiest->group_type == group_asym_packing)
goto force_balance;
@@ -9997,6 +9996,8 @@ static struct sched_group *find_busiest_group(struct lb_env *env)
if (busiest->group_type == group_imbalanced)
goto force_balance;
local = &sds.local_stat;
/*
* If the local group is busier than the selected busiest group
* don't try and pull any tasks.