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sched/fair: Don't allow boosted tasks to be migrated to small cores

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We want boosted tasks to run on big cores. But CAF's load balancer
changes do not account for SchedTune boosting, so this allows for
boosted tasks to be migrated to a suboptimal core. Let's mitigate
this by setting the LBF_IGNORE_STUNE_BOOSTED_TASKS for tasks
migrating from a larger capacity core to a min capacity one and
that have a schedtune boost > 10. If both are true, do
not migrate this task. If the next time the load balancer runs,
the same task is selected, we clear the
LBF_IGNORE_STUNE_BOOSTED_TASKS flag.

Change-Id: Ibd9f6616b482d446d5acce2a93418bfda4c35ffb
Signed-off-by: Zachariah Kennedy <zkennedy87@gmail.com>
Signed-off-by: Richard Raya <rdxzv.dev@gmail.com>
This commit is contained in:
Zachariah Kennedy 2019-11-14 18:54:26 +00:00 committed by Richard Raya
parent 2ef5980a4d
commit d5afaaf78f
1 changed files with 13 additions and 2 deletions
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15
kernel/sched/fair.c
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@ -9170,6 +9170,7 @@ enum group_type {
#define LBF_SOME_PINNED 0x08
#define LBF_IGNORE_BIG_TASKS 0x100
#define LBF_IGNORE_PREFERRED_CLUSTER_TASKS 0x200
#define LBF_IGNORE_STUNE_BOOSTED_TASKS 0x400
struct lb_env {
struct sched_domain *sd;
@ -9369,6 +9370,11 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env)
!task_fits_max(p, env->dst_cpu))
return 0;
/* Don't allow boosted tasks to be pulled to small cores */
if (env->flags & LBF_IGNORE_STUNE_BOOSTED_TASKS &&
(schedtune_task_boost(p) > 10))
return 0;
if (task_running(env->src_rq, p)) {
schedstat_inc(p->se.statistics.nr_failed_migrations_running);
return 0;
@ -9490,6 +9496,9 @@ static int detach_tasks(struct lb_env *env)
if (cpu_capacity(env->dst_cpu) < cpu_capacity(env->src_cpu))
env->flags |= LBF_IGNORE_BIG_TASKS;
if (is_min_capacity_cpu(env->dst_cpu) && !is_min_capacity_cpu(env->src_cpu))
env->flags |= LBF_IGNORE_STUNE_BOOSTED_TASKS;
redo:
while (!list_empty(tasks)) {
/*
@ -9574,10 +9583,12 @@ next:
}
if (env->flags & (LBF_IGNORE_BIG_TASKS |
LBF_IGNORE_PREFERRED_CLUSTER_TASKS) && !detached) {
LBF_IGNORE_PREFERRED_CLUSTER_TASKS |
LBF_IGNORE_STUNE_BOOSTED_TASKS) && !detached) {
tasks = &env->src_rq->cfs_tasks;
env->flags &= ~(LBF_IGNORE_BIG_TASKS |
LBF_IGNORE_PREFERRED_CLUSTER_TASKS);
LBF_IGNORE_PREFERRED_CLUSTER_TASKS |
LBF_IGNORE_STUNE_BOOSTED_TASKS);
env->loop = orig_loop;
goto redo;
}