linux-kernel - [RFC 1/2] sched/fair: Rename select_idle_mask to iterator

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Message-Id: <20190708045432.18774-2-parth@linux.ibm.com>
Date:   Mon,  8 Jul 2019 10:24:31 +0530
From:   Parth Shah <parth@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org,
        subhra.mazumdar@...cle.com
Subject: [RFC 1/2] sched/fair: Rename select_idle_mask to iterator_mask

Per cpu variable 'select_idle_mask' serves the only purpose of an iterator
inside select_idle_core method. Also there is an opportunity to optimize
the search for an idle CPU for which this mask is required in the
subsequent patch. Hence renaming this per_cpu variable to iterator mask
which can be used locally for CPU iteration.

Subsequent patch uses the select_idle_mask to keep track of the idle CPUs
which can be shared across function calls.


Signed-off-by: Parth Shah <parth@...ux.ibm.com>
---
 kernel/sched/core.c | 4 ++--
 kernel/sched/fair.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 4778c48a7fda..d5a6bdc956c8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5950,7 +5950,7 @@ static struct kmem_cache *task_group_cache __read_mostly;
 #endif
 
 DECLARE_PER_CPU(cpumask_var_t, load_balance_mask);
-DECLARE_PER_CPU(cpumask_var_t, select_idle_mask);
+DECLARE_PER_CPU(cpumask_var_t, iterator_mask);
 
 void __init sched_init(void)
 {
@@ -5989,7 +5989,7 @@ void __init sched_init(void)
 	for_each_possible_cpu(i) {
 		per_cpu(load_balance_mask, i) = (cpumask_var_t)kzalloc_node(
 			cpumask_size(), GFP_KERNEL, cpu_to_node(i));
-		per_cpu(select_idle_mask, i) = (cpumask_var_t)kzalloc_node(
+		per_cpu(iterator_mask, i) = (cpumask_var_t)kzalloc_node(
 			cpumask_size(), GFP_KERNEL, cpu_to_node(i));
 	}
 #endif /* CONFIG_CPUMASK_OFFSTACK */
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index fdab7eb6f351..20affe03379d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5294,7 +5294,7 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 
 /* Working cpumask for: load_balance, load_balance_newidle. */
 DEFINE_PER_CPU(cpumask_var_t, load_balance_mask);
-DEFINE_PER_CPU(cpumask_var_t, select_idle_mask);
+DEFINE_PER_CPU(cpumask_var_t, iterator_mask);
 
 #ifdef CONFIG_NO_HZ_COMMON
 /*
@@ -6083,7 +6083,7 @@ void __update_idle_core(struct rq *rq)
  */
 static int select_idle_core(struct task_struct *p, struct sched_domain *sd, int target)
 {
-	struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
+	struct cpumask *cpus = this_cpu_cpumask_var_ptr(iterator_mask);
 	int core, cpu;
 
 	if (!static_branch_likely(&sched_smt_present))
-- 
2.17.1