linux-kernel - [PATCH 4/4] sched: make task_hot() once again use sd->cache_hot

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Message-ID: <20080904135034.26109.79306.stgit@dev.haskins.net>
Date:	Thu, 04 Sep 2008 09:50:34 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	peterz@...radead.org, Lin Ming <ming.m.lin@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	yanmin_zhang@...ux.intel.com, mingo@...e.hu
Subject: [PATCH 4/4] sched: make task_hot() once again use sd->cache_hot_time

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index fd28b64..b5f8640 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1778,6 +1778,7 @@ static int
 task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 {
 	s64 delta;
+	s64 migration_cost = (s64)(sd ? sd->cache_hot_time : sysctl_sched_migration_cost);
 
 	/*
 	 * Buddy candidates are cache hot:
@@ -1788,14 +1789,9 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
 	if (p->sched_class != &fair_sched_class)
 		return 0;
 
-	if (sysctl_sched_migration_cost == -1)
-		return 1;
-	if (sysctl_sched_migration_cost == 0)
-		return 0;
-
 	delta = now - p->se.exec_start;
 
-	return delta < (s64)sysctl_sched_migration_cost;
+	return delta < migration_cost;
 }
 
 

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