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sched/walt: remove task from mvp list if task in yield

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When a task yields, it relinquishes the cpu and scheduler
is tasked to find another task.
However he MVP implementation could return the same task
leading to a loop where the yielded task gets to run back.
To fix this, drop the MVP status of tasks that yield
themselves. The MVP status is restored the next time they
actually get enqueued - -likely because of a wakeup from
sleep or task migration.

Change-Id: Ia2a2074f18c4de56e0695ee2c5f1daf8a4eb5980
Signed-off-by: Tengfei Fan <tengfeif@codeaurora.org>
Signed-off-by: Sai Harshini Nimmala <quic_snimmala@quicinc.com>
This commit is contained in:
Tengfei Fan 2021-11-11 09:38:18 +08:00 committed by Rishabh Bhatnagar
parent e2bc168ffb
commit ffce2634bc
1 changed files with 12 additions and 0 deletions
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12
kernel/sched/walt/walt_cfs.c
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@ -1100,6 +1100,16 @@ static void walt_cfs_account_mvp_runtime(struct rq *rq, struct task_struct *curr
walt_cfs_insert_mvp_task(wrq, wts, false);
}
static void walt_cfs_mvp_do_sched_yield(void *unused, struct rq *rq)
{
struct task_struct *curr = rq->curr;
int mvp_prio = walt_get_mvp_task_prio(curr);
lockdep_assert_held(&rq->__lock);
if (mvp_prio != WALT_NOT_MVP)
walt_cfs_deactivate_mvp_task(curr);
}
void walt_cfs_enqueue_task(struct rq *rq, struct task_struct *p)
{
struct walt_rq *wrq = (struct walt_rq *) rq->android_vendor_data1;
@ -1282,4 +1292,6 @@ void walt_cfs_init(void)
register_trace_android_rvh_check_preempt_wakeup(walt_cfs_check_preempt_wakeup, NULL);
register_trace_android_rvh_replace_next_task_fair(walt_cfs_replace_next_task_fair, NULL);
register_trace_android_rvh_do_sched_yield(walt_cfs_mvp_do_sched_yield, NULL);
}