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Subject[RFC PATCH 7/9 v4] Implement Workload Consolidation in idle_balance
Date
1) Skip pulling task to the idle non-consolidated CPUs.

2) In addition, for consolidated Idle CPU, we aggressively pull tasks from
non-consolidated CPUs.

Signed-off-by: Yuyang Du <yuyang.du@intel.com>
---
kernel/sched/fair.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 008cbc9..bf65fde 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2608,6 +2608,9 @@ static inline void dequeue_entity_load_avg(struct cfs_rq *cfs_rq,
static inline void update_cpu_concurrency(struct rq *rq);
static struct sched_group *wc_find_group(struct sched_domain *sd,
struct task_struct *p, int this_cpu);
+static void wc_unload(struct cpumask *nonshielded, struct sched_domain *sd);
+static void wc_nonshielded_mask(int cpu, struct sched_domain *sd,
+ struct cpumask *mask);
static int cpu_cc_capable(int cpu);

/*
@@ -6808,6 +6811,22 @@ static int idle_balance(struct rq *this_rq)

update_blocked_averages(this_cpu);
rcu_read_lock();
+
+ sd = per_cpu(sd_wc, this_cpu);
+ if (sd) {
+ struct cpumask *nonshielded_cpus = __get_cpu_var(load_balance_mask);
+
+ cpumask_copy(nonshielded_cpus, cpu_active_mask);
+
+ /*
+ * if we encounter shielded cpus here, don't do balance on them
+ */
+ wc_nonshielded_mask(this_cpu, sd, nonshielded_cpus);
+ if (!cpumask_test_cpu(this_cpu, nonshielded_cpus))
+ goto unlock;
+ wc_unload(nonshielded_cpus, sd);
+ }
+
for_each_domain(this_cpu, sd) {
int continue_balancing = 1;
u64 t0, domain_cost;
@@ -6843,6 +6862,7 @@ static int idle_balance(struct rq *this_rq)
if (pulled_task || this_rq->nr_running > 0)
break;
}
+unlock:
rcu_read_unlock();

raw_spin_lock(&this_rq->lock);
--
1.7.9.5


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