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EAS: sched/fair: Re-integrate 'honor sync wakeups' into wakeup path

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This patch re-integrates the part which was initially provided by
3b9d7554aeec ("EAS: sched/fair: tunable to honor sync wakeups") into
energy_aware_wake_cpu() into select_energy_cpu_brute().

Change-Id: I748fde3ecdeb44651179bce0a5bb8dd82d1903f6
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
(cherry picked from commit b75b7286cb068d5761621ea134c23dd131db953f)
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
This commit is contained in:
Dietmar Eggemann 2016-12-05 14:15:54 +00:00 • committed by Amit Pundir
commit e89e4bb2be
1 changed files with 10 additions and 2 deletions
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12
kernel/sched/fair.c
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@ -5889,13 +5889,21 @@ static int wake_cap(struct task_struct *p, int cpu, int prev_cpu)
return min_cap * 1024 < task_util(p) * capacity_margin;
}
static int select_energy_cpu_brute(struct task_struct *p, int prev_cpu)
static int select_energy_cpu_brute(struct task_struct *p, int prev_cpu, int sync)
{
int i;
int min_diff = 0, energy_cpu = prev_cpu, spare_cpu = prev_cpu;
unsigned long max_spare = 0;
struct sched_domain *sd;
if (sysctl_sched_sync_hint_enable && sync) {
int cpu = smp_processor_id();
cpumask_t search_cpus;
cpumask_and(&search_cpus, tsk_cpus_allowed(p), cpu_online_mask);
if (cpumask_test_cpu(cpu, &search_cpus))
return cpu;
}
rcu_read_lock();
sd = rcu_dereference(per_cpu(sd_ea, prev_cpu));
@ -5970,7 +5978,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
&& cpumask_test_cpu(cpu, tsk_cpus_allowed(p));
if (energy_aware() && !(cpu_rq(prev_cpu)->rd->overutilized))
return select_energy_cpu_brute(p, prev_cpu);
return select_energy_cpu_brute(p, prev_cpu, sync);
rcu_read_lock();
for_each_domain(cpu, tmp) {