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Merge "sched/walt: Improve the scheduler"

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qctecmdr 2021-01-26 01:04:10 -08:00 • committed by Gerrit - the friendly Code Review server
commit 58fb72eeee
1 changed files with 56 additions and 0 deletions
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56
kernel/sched/rt.c
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@ -1652,6 +1652,55 @@ static void check_preempt_equal_prio(struct rq *rq, struct task_struct *p)
resched_curr(rq);
}
#ifdef CONFIG_SCHED_WALT
#define WALT_RT_PULL_THRESHOLD_NS 250000
static struct task_struct *pick_highest_pushable_task(struct rq *rq, int cpu);
static void try_pull_rt_task(struct rq *this_rq)
{
int i, this_cpu = this_rq->cpu, src_cpu = this_cpu;
struct rq *src_rq;
struct task_struct *p;
if (sched_rt_runnable(this_rq))
return;
for_each_possible_cpu(i) {
struct rq *rq = cpu_rq(i);
if (!has_pushable_tasks(rq))
continue;
src_cpu = i;
break;
}
if (src_cpu == this_cpu)
return;
src_rq = cpu_rq(src_cpu);
double_lock_balance(this_rq, src_rq);
/* lock is dropped, so check again */
if (sched_rt_runnable(this_rq))
goto unlock;
p = pick_highest_pushable_task(src_rq, this_cpu);
if (!p)
goto unlock;
if (sched_ktime_clock() - p->wts.last_wake_ts <
WALT_RT_PULL_THRESHOLD_NS)
goto unlock;
deactivate_task(src_rq, p, 0);
set_task_cpu(p, this_cpu);
activate_task(this_rq, p, 0);
unlock:
double_unlock_balance(this_rq, src_rq);
}
#endif
static int balance_rt(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
{
if (!on_rt_rq(&p->rt) && need_pull_rt_task(rq, p)) {
@ -1662,7 +1711,14 @@ static int balance_rt(struct rq *rq, struct task_struct *p, struct rq_flags *rf)
* not yet started the picking loop.
*/
rq_unpin_lock(rq, rf);
#ifndef CONFIG_SCHED_WALT
pull_rt_task(rq);
#else
if (rt_overloaded(rq))
pull_rt_task(rq);
else
try_pull_rt_task(rq);
#endif
rq_repin_lock(rq, rf);
}