linux-kernel - [RFC PATCH 1/4] linsched: remove "process_all

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Message-ID: <4F8B940B.40608@linux.vnet.ibm.com>
Date:	Mon, 16 Apr 2012 11:37:47 +0800
From:	Michael Wang <wangyun@...ux.vnet.ibm.com>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Paul Turner <pjt@...gle.com>, Dhaval Giani <dhaval.giani@...il.com>
Subject: [RFC PATCH 1/4] linsched: remove "process_all_softirqs" in main loop
 for accuracy

From: Michael Wang <wangyun@...ux.vnet.ibm.com>

"process_all_softirqs" will simulate an extra interrupt which will
cause cpu do extra load balance work.

This will make some cpu more active then others, the unfair will
cause inaccuracy.

Signed-off-by: Michael Wang <wangyun@...ux.vnet.ibm.com>
---
 tools/linsched/hrtimer.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/tools/linsched/hrtimer.c b/tools/linsched/hrtimer.c
index 26be1d8..de88b25 100644
--- a/tools/linsched/hrtimer.c
+++ b/tools/linsched/hrtimer.c
@@ -206,7 +206,6 @@ void linsched_run_sim(int sim_ticks)
 			/* a handler should never leave this state changed */
 			BUG_ON(smp_processor_id() != active_cpu);

-			process_all_softirqs();
 			linsched_rcu_invoke();

 			BUG_ON(irqs_disabled());
-- 
1.7.1

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