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sched/fair: prefer exclusive mid cluster cpu for top-app task

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For a top-app task, if it fits in mid cluster, then prefer the first
cpu in this cluster whenever possible, which happens to be the top-app
exclusive cpu in our cpuset design.

Bug: 128477368
Bug: 144961676
Test: top-app tasks assigned as expected
Change-Id: Ifdd0614f6c8c03edde4ed674c4193f4ba31aac16
Signed-off-by: Rick Yiu <rickyiu@google.com>
Signed-off-by: Jimmy Shiu <jimmyshiu@google.com>
This commit is contained in:
Rick Yiu 2019-04-19 20:33:57 +08:00 committed by spakkkk
parent ca35ac869e
commit 1de73888bd
1 changed files with 18 additions and 6 deletions
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24
kernel/sched/fair.c
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@ -7044,6 +7044,7 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus,
int isolated_candidate = -1;
unsigned int target_nr_rtg_high_prio = UINT_MAX;
bool rtg_high_prio_task = task_rtg_high_prio(p);
int mid_cap_orig_cpu = cpu_rq(smp_processor_id())->rd->mid_cap_orig_cpu;
/*
* In most cases, target_capacity tracks capacity_orig of the most
@ -7196,11 +7197,16 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus,
/*
* Case A.1: IDLE CPU
* Return the best IDLE CPU we find:
* - for boosted tasks: the CPU with the highest
* performance (i.e. biggest capacity_orig)
* - for boosted tasks: if the task fits in mid
* cluster, prefer the first mid cluster cpu
* due to cpuset design, then other mid cluster
* cpus. Otherwise, choose max cluster cpu.
* - for !boosted tasks: the most energy
* efficient CPU (i.e. smallest capacity_orig)
*/
if (boosted && mid_cap_orig_cpu != -1 &&
best_idle_cpu == mid_cap_orig_cpu)
break;
if (idle_cpu(i)) {
if (boosted &&
capacity_orig < target_capacity)
@ -7251,11 +7257,11 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus,
/*
* If utilization is the same between CPUs,
* break the ties with WALT's cumulative
* demand
* break the ties with cumulative demand,
* also prefer lower order cpu.
*/
if (new_util == best_active_util &&
new_util_cuml > best_active_cuml_util)
new_util_cuml >= best_active_cuml_util)
continue;
min_wake_util = wake_util;
best_active_util = new_util;
@ -7410,7 +7416,13 @@ static void find_best_target(struct sched_domain *sd, cpumask_t *cpus,
(boosted && (best_idle_cpu != -1 || target_cpu != -1 ||
(fbt_env->strict_max && most_spare_cap_cpu != -1)))) {
if (boosted) {
if (!next_group_higher_cap)
/*
* For boosted task, stop searching when an idle
* cpu is found in mid cluster.
*/
if ((mid_cap_orig_cpu != -1 &&
best_idle_cpu >= mid_cap_orig_cpu) ||
!next_group_higher_cap)
break;
} else {
if (next_group_higher_cap)