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sched: EAS: Avoid causing spikes to max-freq unnecessarily

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During scheduler tick handling, the frequency was being set to
max-freq if the current frequency is less than the current
utilization. Change to just request "right" frequency instead
of max.

BUG: 29871410
Change-Id: I6fe65b14413da44b1520ba116f72320083eb92f8
This commit is contained in:
Todd Kjos
2016-06-29 11:30:07 -07:00
committed by John Stultz
parent dfc1151b46
commit 782c9d64a1
1 changed files with 8 additions and 5 deletions
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13
kernel/sched/core.c
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@@ -2940,7 +2940,7 @@ static unsigned long sum_capacity_reqs(unsigned long cfs_cap,
static void sched_freq_tick(int cpu)
{
struct sched_capacity_reqs *scr;
unsigned long capacity_orig, capacity_curr;
unsigned long capacity_orig, capacity_curr, capacity_sum;
if (!sched_freq())
return;
@@ -2953,12 +2953,15 @@ static void sched_freq_tick(int cpu)
/*
* To make free room for a task that is building up its "real"
* utilization and to harm its performance the least, request
* a jump to max OPP as soon as the margin of free capacity is
* impacted (specified by capacity_margin).
* a jump to a higher OPP as soon as the margin of free capacity
* is impacted (specified by capacity_margin).
*/
scr = &per_cpu(cpu_sched_capacity_reqs, cpu);
if (capacity_curr < sum_capacity_reqs(cpu_util(cpu), scr))
set_cfs_cpu_capacity(cpu, true, capacity_max);
capacity_sum = sum_capacity_reqs(cpu_util(cpu), scr);
if (capacity_curr < capacity_sum) {
set_cfs_cpu_capacity(cpu, true, capacity_sum);
}
}
#else
static inline void sched_freq_tick(int cpu) { }