diff options
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0062-sched-Consider-a-not-over-utilized-energy-aware-syst.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0062-sched-Consider-a-not-over-utilized-energy-aware-syst.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0062-sched-Consider-a-not-over-utilized-energy-aware-syst.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0062-sched-Consider-a-not-over-utilized-energy-aware-syst.patch new file mode 100644 index 0000000..70ac245 --- /dev/null +++ b/meta-eas/recipes-kernel/linux/linux-renesas/0062-sched-Consider-a-not-over-utilized-energy-aware-syst.patch @@ -0,0 +1,49 @@ +From f02fa9f5a150721451b41d9677f9c5f5710c09a9 Mon Sep 17 00:00:00 2001 +From: Dietmar Eggemann <dietmar.eggemann@arm.com> +Date: Sun, 10 May 2015 15:17:32 +0100 +Subject: [PATCH 62/92] sched: Consider a not over-utilized energy-aware system + as balanced + +In case the system operates below the tipping point indicator, +introduced in ("sched: Add over-utilization/tipping point +indicator"), bail out in find_busiest_group after the dst and src +group statistics have been checked. + +There is simply no need to move usage around because all involved +cpus still have spare cycles available. + +For an energy-aware system below its tipping point, we rely on the +task placement of the wakeup path. This works well for short running +tasks. + +The existence of long running tasks on one of the involved cpus lets +the system operate over its tipping point. To be able to move such +a task (whose load can't be used to average the load among the cpus) +from a src cpu with lower capacity than the dst_cpu, an additional +rule has to be implemented in need_active_balance. + +Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> +(cherry picked from commit e604c981fa91a5e5522cd4a5a057880ab54d374c) +Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> +--- + kernel/sched/fair.c | 4 ++++ + 1 file changed, 4 insertions(+) + +diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c +index 3c193f5..360e922 100644 +--- a/kernel/sched/fair.c ++++ b/kernel/sched/fair.c +@@ -8103,6 +8103,10 @@ static struct sched_group *find_busiest_group(struct lb_env *env) + * this level. + */ + update_sd_lb_stats(env, &sds); ++ ++ if (energy_aware() && !env->dst_rq->rd->overutilized) ++ goto out_balanced; ++ + local = &sds.local_stat; + busiest = &sds.busiest_stat; + +-- +1.9.1 + |