evie/android_kernel_oneplus_msm8998
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sched: Only do EA migration when CPU throttling is imminent

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We do not want to migrate tasks unnecessary to avoid cache hit and other
migration latencies that could affect the performance of the system. Add
a check to only try EA migration when CPU frequency throttling is
imminent.

CRs-Fixed: 764788
Change-Id: I92e86e62da10ce15f1e76a980df3545e93d76348
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
[rameezmustafa@codeaurora.org]: Port to msm-3.18]
Signed-off-by: Syed Rameez Mustafa <rameezmustafa@codeaurora.org
This commit is contained in:
Olav Haugan 2014-11-24 16:27:20 -08:00 • committed by David Keitel
parent 29a412dffa
commit 72fa561b0d
1 changed files with 20 additions and 1 deletions
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21
kernel/sched/fair.c
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@ -3623,6 +3623,8 @@ static int lower_power_cpu_available(struct task_struct *p, int cpu)
return (lowest_power_cpu != task_cpu(p));
}
static inline int is_cpu_throttling_imminent(int cpu);
/*
* Check if a task is on the "wrong" cpu (i.e its current cpu is not the ideal
* cpu as per its demand or priority)
@ -3655,6 +3657,7 @@ static inline int migration_needed(struct rq *rq, struct task_struct *p)
return MOVE_TO_BIG_CPU;
if (sched_enable_power_aware &&
is_cpu_throttling_imminent(cpu_of(rq)) &&
lower_power_cpu_available(p, cpu_of(rq)))
return MOVE_TO_POWER_EFFICIENT_CPU;
@ -3718,6 +3721,16 @@ static inline int nr_big_tasks(struct rq *rq)
return rq->nr_big_tasks;
}
static inline int is_cpu_throttling_imminent(int cpu)
{
int throttling = 0;
struct cpu_pwr_stats *per_cpu_info = get_cpu_pwr_stats();
if (per_cpu_info)
throttling = per_cpu_info[cpu].throttling;
return throttling;
}
#else /* CONFIG_SCHED_HMP */
#define sched_enable_power_aware 0
@ -3774,6 +3787,11 @@ static inline int nr_big_tasks(struct rq *rq)
return 0;
}
static inline int is_cpu_throttling_imminent(int cpu)
{
return 0;
}
#endif /* CONFIG_SCHED_HMP */
#ifdef CONFIG_SCHED_HMP
@ -7745,7 +7763,8 @@ group_type group_classify(struct sched_group *group,
if ((capacity(env->dst_rq) == group_rq_capacity(group)) &&
sgs->sum_nr_running && (env->idle != CPU_NOT_IDLE) &&
power_cost_at_freq(env->dst_cpu, 0) <
power_cost_at_freq(cpumask_first(sched_group_cpus(group)), 0)) {
power_cost_at_freq(cpumask_first(sched_group_cpus(group)), 0) &&
is_cpu_throttling_imminent(cpumask_first(sched_group_cpus(group)))) {
env->flags |= LBF_PWR_ACTIVE_BALANCE;
return group_ea;
}