Subject: Re: + i386-time-avoid-pit-smp-lockups.patch added to -mm tree
From: Daniel Walker <dwalker@mvista.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, johnstul@us.ibm.com, mingo@elte.hu,
       tglx@linutronix.de
In-Reply-To: <200610191605.39933.ak@suse.de>
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Date: Thu, 19 Oct 2006 07:50:32 -0700
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On Thu, 2006-10-19 at 16:05 +0200, Andi Kleen wrote:
> > You just mean the if statement above though? I was talking more about
> > the structure above this called "clocksource_pit" which isn't used on
> > SMP systems due to this code addition. AFAIK init_pit_clocksource()
> > could disappear along with the clocksource structure ..
> 
> It will end up as a int f() { return 0; }. Not very much overhead. 
> 
> -Andi

Here's what I found .. 

-rwxr-xr-x  1 dwalker engr 48252535 Oct 19 07:47 vmlinux
-rwxr-xr-x  1 dwalker engr 48249958 Oct 19 07:47 vmlinux.ifdef

So we're talking about ~2.5k of code including the pit_read and
clocksource structure.

Daniel

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