linux-kernel - Re: 2.6.20-rc6-mm3

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Message-ID: <20070206205231.GA25430@elte.hu>
Date:	Tue, 6 Feb 2007 21:52:31 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.20-rc6-mm3


* Daniel Walker <dwalker@...sta.com> wrote:

> On Tue, 2007-02-06 at 21:20 +0100, Thomas Gleixner wrote:
> > On Tue, 2007-02-06 at 11:55 -0800, Daniel Walker wrote:
> > > > What kind of artificial problem are you creating here ?
> > >
> > > I'm not trying to create anything .. However, as I said before
> > > the /proc/interrupts "timer" entry doesn't work the same as it has in
> > > other kernels.
> > 
> > Yes, it is different. Why are you insisting, that something is a problem
> > just because it is different ?
> 
> In this case "different" goes into userspace .. So different could 
> mean userspace regression, which is something that we don't want. I 
> have no idea if any apps use /proc/interrupts , but it's possible 
> since it's been around for a long time.

Well, if you enable dynticks you should expect the number of timer irqs 
to go down. There's no problem here.

> The reason that I'm bringing it up at all is because people have ask 
> me "Why isn't my timer ticking??"

it's quite easy to explain: because of the new dynticks feature. Both 
'timer' and 'LOC' counts go way down.

> It might be nicer to list all the registered clock event sources in 
> /proc/interrupts, with more descriptive names ..

they are already listed in /proc/interrupts, depending on how they use 
interrupts. For a more complete list of in-use clockevent drivers see 
/proc/timer_info. But it would be wrong to touch /proc/interrupts to 
create some special-case for clockevents.

	Ingo
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