linux-kernel - [PATCH] sched_fair: add schedule equal check condition

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Message-ID: <1267786990.2576.6.camel@myhost>
Date:	Fri, 05 Mar 2010 19:03:10 +0800
From:	"Figo.zhang" <figo1802@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	lkml <linux-kernel@...r.kernel.org>
Subject: [PATCH] sched_fair: add schedule equal check condition

 
in check_preempt_tick() function, the check schedule condition,the reality increasing runtime 
"delta_exec", vruntion increasing runtime "delta" and reality ideal time "ideal_runtime":
	if (delta_exec > ideal_runtime)
and
	if (delta > ideal_runtime)
if equal, it had better be schedule.

Signed-off-by: Figo.zhang <figo1802@...il.com>
---
kernel/sched_fair.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 8fe7ee8..65fd43e 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -859,7 +859,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
 
 	ideal_runtime = sched_slice(cfs_rq, curr);
 	delta_exec = curr->sum_exec_runtime - curr->prev_sum_exec_runtime;
-	if (delta_exec > ideal_runtime) {
+	if (delta_exec >= ideal_runtime) {
 		resched_task(rq_of(cfs_rq)->curr);
 		/*
 		 * The current task ran long enough, ensure it doesn't get
@@ -884,7 +884,7 @@ check_preempt_tick(struct cfs_rq *cfs_rq, struct sched_entity *curr)
 		struct sched_entity *se = __pick_next_entity(cfs_rq);
 		s64 delta = curr->vruntime - se->vruntime;
 
-		if (delta > ideal_runtime)
+		if (delta >= ideal_runtime)
 			resched_task(rq_of(cfs_rq)->curr);
 	}
 }


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