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Merge "sched/fair: Improve the scheduler"

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qctecmdr 2020-07-29 22:49:09 -07:00 committed by Gerrit - the friendly Code Review server
commit 759dd5e50c
1 changed files with 21 additions and 2 deletions
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23
kernel/sched/fair.c
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@ -11768,6 +11768,21 @@ static inline bool nohz_idle_balance(struct rq *this_rq, enum cpu_idle_type idle
static inline void nohz_newidle_balance(struct rq *this_rq) { }
#endif /* CONFIG_NO_HZ_COMMON */
static bool silver_has_big_tasks(void)
{
int cpu;
for_each_possible_cpu(cpu) {
if (!is_min_capacity_cpu(cpu))
break;
if (walt_big_tasks(cpu))
return true;
}
return false;
}
/*
* idle_balance is called by schedule() if this_cpu is about to become
* idle. Attempts to pull tasks from other CPUs.
@ -11781,6 +11796,10 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf)
u64 curr_cost = 0;
u64 avg_idle = this_rq->avg_idle;
bool prefer_spread = prefer_spread_on_idle(this_cpu);
bool force_lb = (!is_min_capacity_cpu(this_cpu) &&
silver_has_big_tasks() &&
(atomic_read(&this_rq->nr_iowait) == 0));
if (cpu_isolated(this_cpu))
return 0;
@ -11797,7 +11816,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf)
if (!cpu_active(this_cpu))
return 0;
if (prefer_spread)
if (force_lb || prefer_spread)
avg_idle = ULLONG_MAX;
/*
* This is OK, because current is on_cpu, which avoids it being picked
@ -11832,7 +11851,7 @@ static int idle_balance(struct rq *this_rq, struct rq_flags *rf)
if (!(sd->flags & SD_LOAD_BALANCE))
continue;
if (prefer_spread &&
if (prefer_spread && !force_lb &&
(sd->flags & SD_ASYM_CPUCAPACITY) &&
!is_asym_cap_cpu(this_cpu))
avg_idle = this_rq->avg_idle;