From: Michael Wang <wangyun@linux.vnet.ibm.com>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Paul Turner <pjt@google.com>, Dhaval Giani <dhaval.giani@gmail.com>
Subject: [RFC PATCH 1/4] linsched: remove "process_all_softirqs" in main loop for accuracy
Date: Mon, 16 Apr 2012 11:37:47 +0800 [thread overview]
Message-ID: <4F8B940B.40608@linux.vnet.ibm.com> (raw)
From: Michael Wang <wangyun@linux.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@linux.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
next reply other threads:[~2012-04-16 3:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-16 3:37 Michael Wang [this message]
2012-09-03 3:58 [RFC PATCH 1/4] linsched: remove process_all_softirqs() in main loop for accuracy Michael Wang
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