linux-kernel - [PATCH 1/4] sched/numa: remove unused code from update_numa

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Message-Id: <1535548752-4434-2-git-send-email-vincent.guittot@linaro.org>
Date:   Wed, 29 Aug 2018 15:19:09 +0200
From:   Vincent Guittot <vincent.guittot@...aro.org>
To:     peterz@...radead.org, mingo@...hat.com,
        linux-kernel@...r.kernel.org
Cc:     Vincent Guittot <vincent.guittot@...aro.org>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Rik van Riel <riel@...riel.com>
Subject: [PATCH 1/4] sched/numa: remove unused code from update_numa_stats()

With :
  commit 2d4056fafa19 ("sched/numa: Remove numa_has_capacity()")

the local variables smt, cpus and capacity and their results are not used
anymore in numa_has_capacity()

Remove this unused code

Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Rik van Riel <riel@...riel.com>
Cc: linux-kernel@...r.kernel.org (open list)
Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 kernel/sched/fair.c | 21 +--------------------
 1 file changed, 1 insertion(+), 20 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 309c93f..c2b8bf4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -1463,8 +1463,7 @@ struct numa_stats {
  */
 static void update_numa_stats(struct numa_stats *ns, int nid)
 {
-	int smt, cpu, cpus = 0;
-	unsigned long capacity;
+	int cpu;
 
 	memset(ns, 0, sizeof(*ns));
 	for_each_cpu(cpu, cpumask_of_node(nid)) {
@@ -1473,26 +1472,8 @@ static void update_numa_stats(struct numa_stats *ns, int nid)
 		ns->nr_running += rq->nr_running;
 		ns->load += weighted_cpuload(rq);
 		ns->compute_capacity += capacity_of(cpu);
-
-		cpus++;
 	}
 
-	/*
-	 * If we raced with hotplug and there are no CPUs left in our mask
-	 * the @ns structure is NULL'ed and task_numa_compare() will
-	 * not find this node attractive.
-	 *
-	 * We'll detect a huge imbalance and bail there.
-	 */
-	if (!cpus)
-		return;
-
-	/* smt := ceil(cpus / capacity), assumes: 1 < smt_power < 2 */
-	smt = DIV_ROUND_UP(SCHED_CAPACITY_SCALE * cpus, ns->compute_capacity);
-	capacity = cpus / smt; /* cores */
-
-	capacity = min_t(unsigned, capacity,
-		DIV_ROUND_CLOSEST(ns->compute_capacity, SCHED_CAPACITY_SCALE));
 }
 
 struct task_numa_env {
-- 
2.7.4