linux-kernel - Re: [bisected] Strange slowdowns timerfd related

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Message-ID: <alpine.LFD.2.02.1105252309040.3078@ionos>
Date:	Wed, 25 May 2011 23:10:53 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Markus Trippelsdorf <markus@...ppelsdorf.de>
cc:	linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Subject: Re: [bisected] Strange slowdowns timerfd related

On Wed, 25 May 2011, Markus Trippelsdorf wrote:

> I've tested the latest git-kernel today and did experience long delays
> in Firefox. Just opening a new tab would take a few seconds and after
> typing a few characters into the "awesome bar" I would have to wait ages
> before the results were shown.
> 
> This is the bisection result:
> 
>  commit 9ec2690758a5467f24beb301cca5098078073bba
>  Author: Thomas Gleixner <tglx@...utronix.de>
>  Date:   Fri May 20 16:18:50 2011 +0200
> 
>      timerfd: Manage cancelable timers in timerfd
> 
> Reverting the commit above fixes the problem.

Yes, Linus came to the same result. Fix below.

Thanks,

	tglx_hidden_under_a_brown_paperbag

------->
	
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index c541ee5..a9205e3 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -748,7 +748,7 @@ static inline void retrigger_next_event(void *arg) { }
  */
 void clock_was_set(void)
 {
-#ifdef CONFIG_HIGHRES_TIMERS
+#ifdef CONFIG_HIGH_RES_TIMERS
 	/* Retrigger the CPU local events everywhere */
 	on_each_cpu(retrigger_next_event, NULL, 1);
 #endif
--
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