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sched: ems: service: Fix service CPU selection algorithm

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1. Consider boosted task utilization when choosing/considering
maximum spare capacity
2. Take advantage of CPU cstates
3. Account of task utilization to avoid overutilizing a CPU

Signed-off-by: Diep Quynh <remilia.1505@gmail.com>
This commit is contained in:
Diep Quynh 2020-07-05 23:58:19 +07:00 • committed by Mustafa Gökmen
parent 18a9c42851
commit 8a2aace408
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GPG key ID: 3204D8100CFF21ED
1 changed files with 13 additions and 7 deletions
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20
kernel/sched/ems/service.c
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@ -106,6 +106,7 @@ select_prefer_cpu(struct task_struct *p, int coregroup_count, struct cpumask *pr
struct cpumask mask;
int coregroup, cpu;
unsigned long max_spare_cap = 0;
unsigned long min_idle_util = ULONG_MAX;
int best_perf_cstate = INT_MAX;
int best_perf_cpu = -1;
int backup_cpu = -1;
@ -118,28 +119,33 @@ select_prefer_cpu(struct task_struct *p, int coregroup_count, struct cpumask *pr
continue;
for_each_cpu_and(cpu, &p->cpus_allowed, &mask) {
unsigned long capacity_orig;
unsigned long wake_util;
unsigned long capacity_orig = capacity_orig_of(cpu);
unsigned long new_util = cpu_util_wake(cpu, p) + task_util_est(p);
new_util = max(new_util, boosted_task_util(p));
if (new_util > capacity_orig)
continue;
if (idle_cpu(cpu)) {
int idle_idx = idle_get_state_idx(cpu_rq(cpu));
/* find shallowest idle state cpu */
if (idle_idx >= best_perf_cstate)
if (idle_idx > best_perf_cstate ||
(idle_idx == best_perf_cstate &&
new_util >= min_idle_util))
continue;
/* Keep track of best idle CPU */
min_idle_util = new_util;
best_perf_cstate = idle_idx;
best_perf_cpu = cpu;
continue;
}
capacity_orig = capacity_orig_of(cpu);
wake_util = cpu_util_wake(cpu, p);
if ((capacity_orig - wake_util) < max_spare_cap)
if ((capacity_orig - new_util) < max_spare_cap)
continue;
max_spare_cap = capacity_orig - wake_util;
max_spare_cap = capacity_orig - new_util;
backup_cpu = cpu;
}