linux-kernel - [RESEND PATCH v2 1/1] scheduler: minor improvement to pick_next_highest_task

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Message-ID: <2EF88150C0EF2C43A218742ED384C1BC0FC8439E@IRVEXCHMB08.corp.ad.broadcom.com>
Date:	Wed, 21 Mar 2012 07:52:57 +0000
From:	"Michael J. Wang" <mjwang@...adcom.com>
To:	"mingo@...e.hu" <mingo@...e.hu>,
	"peterz@...radead.org" <peterz@...radead.org>
cc:	"Yong Zhang" <yong.zhang0@...il.com>,
	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Michael J. Wang" <mjwang@...adcom.com>
Subject: [RESEND PATCH v2 1/1] scheduler: minor improvement to
 pick_next_highest_task_rt in linux-3.3

From: Michael J Wang <mjwang@...adcom.com>

Avoid extra work by skipping rt_rq's whose max prio is equal to next->prio

Signed-off-by: Michael J Wang <mjwang@...adcom.com>

--- 

--- linux-3.3/kernel/sched/rt.c.orig	2012-03-18 16:15:34.000000000 -0700
+++ linux-3.3/kernel/sched/rt.c	2012-03-19 14:52:54.585391702 -0700
@@ -1403,7 +1403,7 @@
 next_idx:
 		if (idx >= MAX_RT_PRIO)
 			continue;
-		if (next && next->prio < idx)
+		if (next && next->prio <= idx)
 			continue;
 		list_for_each_entry(rt_se, array->queue + idx, run_list) {
 			struct task_struct *p;


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