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sched: EAS/WALT: take into account of waking task's load

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WALT's function cpu_util(cpu) reports CPU's load without taking into
account of waking task's load.  Thus currently cpu_overutilized()
underestimates load on the previous CPU of waking task.

Take into account of task's load to determine whether previous CPU is
overutilzed to bail out early without running energy_diff() which is
expensive.

Change-Id: I30f146984a880ad2cc1b8a4ce35bd239a8c9a607
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>
(minor rebase conflicts)
Signed-off-by: Chris Redpath <chris.redpath@arm.com>
(cherry picked from commit 94e5c96507)
[trivial cherry-pick issues]
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
This commit is contained in:
Joonwoo Park
2017-01-25 17:45:56 -08:00
committed by Todd Kjos
parent 4f0693ad08
commit b41e1ca689
1 changed files with 14 additions and 2 deletions
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16
kernel/sched/fair.c
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@@ -4786,6 +4786,7 @@ static inline void hrtick_update(struct rq *rq)
#endif
#ifdef CONFIG_SMP
static bool __cpu_overutilized(int cpu, int delta);
static bool cpu_overutilized(int cpu);
unsigned long boosted_cpu_util(int cpu);
#else
@@ -6025,9 +6026,14 @@ static inline bool task_fits_max(struct task_struct *p, int cpu)
return __task_fits(p, cpu, 0);
}
static bool __cpu_overutilized(int cpu, int delta)
{
return (capacity_of(cpu) * 1024) < ((cpu_util(cpu) + delta) * capacity_margin);
}
static bool cpu_overutilized(int cpu)
{
return (capacity_of(cpu) * 1024) < (cpu_util(cpu) * capacity_margin);
return __cpu_overutilized(cpu, 0);
}
#ifdef CONFIG_SCHED_TUNE
@@ -7032,6 +7038,7 @@ static int select_energy_cpu_brute(struct task_struct *p, int prev_cpu, int sync
}
if (target_cpu != prev_cpu) {
int delta = 0;
struct energy_env eenv = {
.util_delta = task_util(p),
.src_cpu = prev_cpu,
@@ -7040,8 +7047,13 @@ static int select_energy_cpu_brute(struct task_struct *p, int prev_cpu, int sync
.trg_cpu = target_cpu,
};
#ifdef CONFIG_SCHED_WALT
if (!walt_disabled && sysctl_sched_use_walt_cpu_util)
delta = task_util(p);
#endif
/* Not enough spare capacity on previous cpu */
if (cpu_overutilized(prev_cpu)) {
if (__cpu_overutilized(prev_cpu, delta)) {
schedstat_inc(p->se.statistics.nr_wakeups_secb_insuff_cap);
schedstat_inc(this_rq()->eas_stats.secb_insuff_cap);
goto unlock;