linux-kernel - [PATCH 1/1] sched: make update_min

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Date:	Sun,  5 Jul 2015 18:33:48 +0900
From:	byungchul.park@....com
To:	mingo@...nel.org, peterz@...radead.org
Cc:	minchan.kim@....com, linux-kernel@...r.kernel.org,
	Byungchul Park <byungchul.park@....com>
Subject: [PATCH 1/1] sched: make update_min_vruntime() more readable

From: Byungchul Park <byungchul.park@....com>

update_min_vruntime() condition flow can be simpler

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 kernel/sched/fair.c |   17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3d57cc0..59de964 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -463,20 +463,17 @@ static void update_min_vruntime(struct cfs_rq *cfs_rq)
 {
 	u64 vruntime = cfs_rq->min_vruntime;
 
-	if (cfs_rq->curr)
-		vruntime = cfs_rq->curr->vruntime;
-
 	if (cfs_rq->rb_leftmost) {
 		struct sched_entity *se = rb_entry(cfs_rq->rb_leftmost,
 						   struct sched_entity,
 						   run_node);
 
-		if (!cfs_rq->curr)
-			vruntime = se->vruntime;
-		else
-			vruntime = min_vruntime(vruntime, se->vruntime);
+		vruntime = se->vruntime;
 	}
 
+	if (cfs_rq->curr)
+		vruntime = min_vruntime(vruntime, cfs_rq->curr->vruntime);
+
 	/* ensure we never gain time by being placed backwards. */
 	cfs_rq->min_vruntime = max_vruntime(cfs_rq->min_vruntime, vruntime);
 #ifndef CONFIG_64BIT
@@ -5552,7 +5549,7 @@ static bool yield_to_task_fair(struct rq *rq, struct task_struct *p, bool preemp
  *
  * The adjacency matrix of the resulting graph is given by:
  *
- *             log_2 n     
+ *             log_2 n
  *   A_i,j = \Union     (i % 2^k == 0) && i / 2^(k+1) == j / 2^(k+1)  (6)
  *             k = 0
  *
@@ -5598,7 +5595,7 @@ static bool yield_to_task_fair(struct rq *rq, struct task_struct *p, bool preemp
  *
  * [XXX write more on how we solve this.. _after_ merging pjt's patches that
  *      rewrite all of this once again.]
- */ 
+ */
 
 static unsigned long __read_mostly max_load_balance_interval = HZ/10;
 
@@ -6337,7 +6334,7 @@ void update_group_capacity(struct sched_domain *sd, int cpu)
 		/*
 		 * !SD_OVERLAP domains can assume that child groups
 		 * span the current group.
-		 */ 
+		 */
 
 		group = child->groups;
 		do {
-- 
1.7.9.5

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