linux-kernel - Re: + i386-time-avoid-pit-smp-lockups.patch added to -mm tree

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Message-Id: <1161269432.11264.18.camel@c-67-180-230-165.hsd1.ca.comcast.net>
Date:	Thu, 19 Oct 2006 07:50:32 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, johnstul@...ibm.com, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: + i386-time-avoid-pit-smp-lockups.patch added to -mm tree

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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