linux-kernel - [PATCH] sched/core: Remove wakeup_gran with single call calc_delta

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Date:	Mon,  6 Apr 2015 21:43:43 +0300
From:	Abel Vesa <abelvesa@...il.com>
To:	mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, Abel Vesa <abelvesa@...il.com>
Subject: [PATCH] sched/core: Remove wakeup_gran with single call calc_delta_fair

This patch removes function wakeup_gran and its call by calling directly
calc_delta_fair function with sysctl_sched_wakeup_granularity and se as arguments.

Signed-off-by: Abel Vesa <abelvesa@...il.com>
---
 kernel/sched/fair.c | 38 ++++++++++++++++----------------------
 1 file changed, 16 insertions(+), 22 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 46855d0..63a4051 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4927,27 +4927,6 @@ migrate_task_rq_fair(struct task_struct *p, int next_cpu)
 }
 #endif /* CONFIG_SMP */
 
-static unsigned long
-wakeup_gran(struct sched_entity *curr, struct sched_entity *se)
-{
-	unsigned long gran = sysctl_sched_wakeup_granularity;
-
-	/*
-	 * Since its curr running now, convert the gran from real-time
-	 * to virtual-time in his units.
-	 *
-	 * By using 'se' instead of 'curr' we penalize light tasks, so
-	 * they get preempted easier. That is, if 'se' < 'curr' then
-	 * the resulting gran will be larger, therefore penalizing the
-	 * lighter, if otoh 'se' > 'curr' then the resulting gran will
-	 * be smaller, again penalizing the lighter task.
-	 *
-	 * This is especially important for buddies when the leftmost
-	 * task is higher priority than the buddy.
-	 */
-	return calc_delta_fair(gran, se);
-}
-
 /*
  * Should 'se' preempt 'curr'.
  *
@@ -4970,7 +4949,22 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
 	if (vdiff <= 0)
 		return -1;
 
-	gran = wakeup_gran(curr, se);
+	/*
+	 * Since its curr running now, convert the gran from real-time
+	 * to virtual-time in his units.
+	 *
+	 * By using 'se' instead of 'curr' we penalize light tasks, so
+	 * they get preempted easier. That is, if 'se' < 'curr' then
+	 * the resulting gran will be larger, therefore penalizing the
+	 * lighter, if otoh 'se' > 'curr' then the resulting gran will
+	 * be smaller, again penalizing the lighter task.
+	 *
+	 * This is especially important for buddies when the leftmost
+	 * task is higher priority than the buddy.
+	 */
+
+	gran = calc_delta_fair(sysctl_sched_wakeup_granularity, se);
+
 	if (vdiff > gran)
 		return 1;
 
-- 
1.9.1

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