linux-kernel - Re: [PATCH 4/6] RTC: Ratelimit "lost interrupts" message

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Message-Id: <1180040212.12570.279.camel@cunning>
Date:	Thu, 24 May 2007 16:56:52 -0400
From:	Ben Collins <ben.collins@...ntu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] RTC: Ratelimit "lost interrupts" message

On Thu, 2007-05-24 at 13:48 -0700, Andrew Morton wrote:
> On Wed, 23 May 2007 18:23:06 -0400
> Ben Collins <bcollins@...ntu.com> wrote:
> 
> > Signed-off-by: Ben Collins <bcollins@...ntu.com>
> > ---
> >  drivers/char/rtc.c |    3 ++-
> >  1 files changed, 2 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
> > index 20380a2..22cf7aa 100644
> > --- a/drivers/char/rtc.c
> > +++ b/drivers/char/rtc.c
> > @@ -1159,7 +1159,8 @@ static void rtc_dropped_irq(unsigned long data)
> >  
> >  	spin_unlock_irq(&rtc_lock);
> >  
> > -	printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);
> > +	if (printk_ratelimit())
> > +		printk(KERN_WARNING "rtc: lost some interrupts at %ldHz.\n", freq);
> >  
> 
> Presumably someone is getting a lot of these messages.
> 
> Do we know why?  Is there something which needs fixing here?

I got it a lot when using any sort of virtualization on my Core2Duo
(kvm, vmware, qemu). Just a big spew. Honestly, I was getting this with
2.6.20, and haven't tested again with latest kernel.

-- 
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