linux-kernel - [PATCH] sched: Remove unnecessary numa dequeue update from non-SMP kernel

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Message-ID: <1454366879.21738.29.camel@schen9-desk2.jf.intel.com>
Date:	Mon, 01 Feb 2016 14:47:59 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] sched: Remove unnecessary numa dequeue update from non-SMP
 kernel


In account_entity_enqueue, we do not do account_numa_enqueue
as NUMA balancing is not needed for non-SMP configured kernel.

Hence, we should remove account_numa_dequeue from
account_entity_dequeue for the non-SMP kernel.

Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 56b7d4b..6cbe2fb 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2405,10 +2405,12 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
 	update_load_sub(&cfs_rq->load, se->load.weight);
 	if (!parent_entity(se))
 		update_load_sub(&rq_of(cfs_rq)->load, se->load.weight);
+#ifdef CONFIG_SMP
 	if (entity_is_task(se)) {
 		account_numa_dequeue(rq_of(cfs_rq), task_of(se));
 		list_del_init(&se->group_node);
 	}
+#endif
 	cfs_rq->nr_running--;
 }
 
-- 
1.8.3.1