diff options
Diffstat (limited to 'meta-eas/recipes-kernel/linux/linux-renesas/0022-sched-Enable-idle-balance-to-pull-single-task-toward.patch')
| -rw-r--r-- | meta-eas/recipes-kernel/linux/linux-renesas/0022-sched-Enable-idle-balance-to-pull-single-task-toward.patch | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/meta-eas/recipes-kernel/linux/linux-renesas/0022-sched-Enable-idle-balance-to-pull-single-task-toward.patch b/meta-eas/recipes-kernel/linux/linux-renesas/0022-sched-Enable-idle-balance-to-pull-single-task-toward.patch new file mode 100644 index 0000000..d8d1877 --- /dev/null +++ b/meta-eas/recipes-kernel/linux/linux-renesas/0022-sched-Enable-idle-balance-to-pull-single-task-toward.patch @@ -0,0 +1,55 @@ +From 23326036926c9495301467238107ab942286aa54 Mon Sep 17 00:00:00 2001 +From: Dietmar Eggemann <dietmar.eggemann@arm.com> +Date: Mon, 26 Jan 2015 19:47:28 +0000 +Subject: [PATCH 22/92] sched: Enable idle balance to pull single task towards + cpu with higher capacity + +We do not want to miss out on the ability to pull a single remaining +task from a potential source cpu towards an idle destination cpu. Add an +extra criteria to need_active_balance() to kick off active load balance +if the source cpu is over-utilized and has lower capacity than the +destination cpu. + +cc: Ingo Molnar <mingo@redhat.com> +cc: Peter Zijlstra <peterz@infradead.org> +Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com> +Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com> +(cherry picked from commit 006d246f483211175d75b8a2b90000c36c486b7d) +Signed-off-by: Gaku Inami <gaku.inami.xw@bp.renesas.com> +--- + kernel/sched/fair.c | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c +index 341fccd..cb283ca 100644 +--- a/kernel/sched/fair.c ++++ b/kernel/sched/fair.c +@@ -5859,6 +5859,11 @@ static int wake_cap(struct task_struct *p, int cpu, int prev_cpu) + return min_cap * 1024 < task_util(p) * capacity_margin; + } + ++static bool cpu_overutilized(int cpu) ++{ ++ return (capacity_of(cpu) * 1024) < (cpu_util(cpu) * capacity_margin); ++} ++ + /* + * select_task_rq_fair: Select target runqueue for the waking task in domains + * that have the 'sd_flag' flag set. In practice, this is SD_BALANCE_WAKE, +@@ -7924,6 +7929,13 @@ static int need_active_balance(struct lb_env *env) + return 1; + } + ++ if ((capacity_of(env->src_cpu) < capacity_of(env->dst_cpu)) && ++ env->src_rq->cfs.h_nr_running == 1 && ++ cpu_overutilized(env->src_cpu) && ++ !cpu_overutilized(env->dst_cpu)) { ++ return 1; ++ } ++ + return unlikely(sd->nr_balance_failed > sd->cache_nice_tries+2); + } + +-- +1.9.1 + |