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Subject[PATCH 11/14] sched: filter task pull request
Date
Only CPUs that participates to the packing effort can pull tasks on a busiest
group.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
kernel/sched/fair.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 28f8ea7..6f63fb9 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3494,6 +3494,12 @@ static bool is_buddy_full(int cpu)
return (sum * 1024 >= period * 1000);
}

+static bool is_my_buddy(int cpu, int buddy)
+{
+ int my_buddy = per_cpu(sd_pack_buddy, cpu);
+ return (my_buddy == -1) || (buddy == my_buddy);
+}
+
static bool is_light_task(struct task_struct *p)
{
/* A light task runs less than 20% in average */
@@ -4688,8 +4694,8 @@ static inline void update_sg_lb_stats(struct lb_env *env,

/* Bias balancing toward cpus of our domain */
if (local_group) {
- if (idle_cpu(i) && !first_idle_cpu &&
- cpumask_test_cpu(i, sched_group_mask(group))) {
+ if (is_my_buddy(i, i) && idle_cpu(i) && !first_idle_cpu
+ && cpumask_test_cpu(i, sched_group_mask(group))) {
first_idle_cpu = 1;
balance_cpu = i;
}
@@ -4817,6 +4823,10 @@ static void update_plb_buddy(int cpu, int *balance, struct sd_lb_stats *sds,

/* Get my new buddy */
buddy = per_cpu(sd_pack_buddy, cpu);
+
+ /* This CPU doesn't act for agressive packing */
+ if (buddy != cpu)
+ sds->busiest = 0;
}

/**
--
1.7.9.5


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