linux-kernel - [tip:sched/core] sched: Make set_*_buddy() work on non-task entities

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Message-ID: <tip-69c80f3e9d3c569f8a3cee94ba1a324b5a7fa6b9@git.kernel.org>
Date:	Tue, 19 Apr 2011 12:05:15 GMT
From:	tip-bot for Venkatesh Pallipadi <venki@...gle.com>
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,
	venki@...gle.com
Subject: [tip:sched/core] sched: Make set_*_buddy() work on non-task entities

Commit-ID:  69c80f3e9d3c569f8a3cee94ba1a324b5a7fa6b9
Gitweb:     http://git.kernel.org/tip/69c80f3e9d3c569f8a3cee94ba1a324b5a7fa6b9
Author:     Venkatesh Pallipadi <venki@...gle.com>
AuthorDate: Wed, 13 Apr 2011 18:21:09 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 19 Apr 2011 10:08:37 +0200

sched: Make set_*_buddy() work on non-task entities

Make set_*_buddy() work on non-task sched_entity, to facilitate the
use of next_buddy to cache a group entity in cases where one of the
tasks within that entity sleeps or gets preempted.

set_skip_buddy() was incorrectly comparing the policy of task that is
yielding to be not equal to SCHED_IDLE. Yielding should happen even
when task yielding is SCHED_IDLE. This change removes the policy check
on the yielding task.

Signed-off-by: Venkatesh Pallipadi <venki@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1302744070-30079-2-git-send-email-venki@google.com
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |   24 ++++++++++++------------
 1 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8744593..501ab63 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1846,26 +1846,26 @@ wakeup_preempt_entity(struct sched_entity *curr, struct sched_entity *se)
 
 static void set_last_buddy(struct sched_entity *se)
 {
-	if (likely(task_of(se)->policy != SCHED_IDLE)) {
-		for_each_sched_entity(se)
-			cfs_rq_of(se)->last = se;
-	}
+	if (entity_is_task(se) && unlikely(task_of(se)->policy == SCHED_IDLE))
+		return;
+
+	for_each_sched_entity(se)
+		cfs_rq_of(se)->last = se;
 }
 
 static void set_next_buddy(struct sched_entity *se)
 {
-	if (likely(task_of(se)->policy != SCHED_IDLE)) {
-		for_each_sched_entity(se)
-			cfs_rq_of(se)->next = se;
-	}
+	if (entity_is_task(se) && unlikely(task_of(se)->policy == SCHED_IDLE))
+		return;
+
+	for_each_sched_entity(se)
+		cfs_rq_of(se)->next = se;
 }
 
 static void set_skip_buddy(struct sched_entity *se)
 {
-	if (likely(task_of(se)->policy != SCHED_IDLE)) {
-		for_each_sched_entity(se)
-			cfs_rq_of(se)->skip = se;
-	}
+	for_each_sched_entity(se)
+		cfs_rq_of(se)->skip = se;
 }
 
 /*
--
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