linux-kernel - [tip:sched/core] sched: Split WAKEUP

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Date:	Wed, 16 Sep 2009 10:19:18 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Split WAKEUP_OVERLAP

Commit-ID:  e6b1b2c9c0461c4e0971ed905ce3cda6512ee82a
Gitweb:     http://git.kernel.org/tip/e6b1b2c9c0461c4e0971ed905ce3cda6512ee82a
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Fri, 11 Sep 2009 11:59:22 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 15 Sep 2009 16:01:02 +0200

sched: Split WAKEUP_OVERLAP

It consists of two conditions, split them out in separate toggles
so we can test them independently.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/sched_fair.c     |    7 ++++---
 kernel/sched_features.h |    1 +
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index aa7f841..cea5b82 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1526,9 +1526,10 @@ static void check_preempt_wakeup(struct rq *rq, struct task_struct *p, int sync)
 	if (!sched_feat(WAKEUP_PREEMPT))
 		return;
 
-	if (sched_feat(WAKEUP_OVERLAP) && (sync ||
-			(se->avg_overlap < sysctl_sched_migration_cost &&
-			 pse->avg_overlap < sysctl_sched_migration_cost))) {
+	if ((sched_feat(WAKEUP_SYNC) && sync) ||
+	    (sched_feat(WAKEUP_OVERLAP) &&
+	     (se->avg_overlap < sysctl_sched_migration_cost &&
+	      pse->avg_overlap < sysctl_sched_migration_cost))) {
 		resched_task(curr);
 		return;
 	}
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index e2dc63a..07c8250 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -12,6 +12,7 @@ SCHED_FEAT(ASYM_GRAN, 1)
 SCHED_FEAT(LB_BIAS, 1)
 SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
 SCHED_FEAT(ASYM_EFF_LOAD, 1)
+SCHED_FEAT(WAKEUP_SYNC, 0)
 SCHED_FEAT(WAKEUP_OVERLAP, 0)
 SCHED_FEAT(LAST_BUDDY, 1)
 SCHED_FEAT(OWNER_SPIN, 1)
--
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