linux-kernel - Re: [PATCH 5/7] x86/jump labels: Use etiher 5 byte or 2 byte jumps

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Date:	Mon, 12 Mar 2012 14:03:51 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 5/7] x86/jump labels: Use etiher 5 byte or 2 byte jumps

On Mon, Mar 12, 2012 at 01:27:07PM -0400, Steven Rostedt wrote:
> Here's my numbers from the latest changes. They are not as big, perhaps
> I had debug enabled too. I took a debian 3.0 config, enabled jump labels
> and some tracing, did a make localyesconfig (something broke it as the
> config still had modules that I had to manual convert to =y). Here's the
> results:
> 
> 
> gcc 4.6.0
> 
>    text	   data	    bss	    dec	    hex	filename
> 14355064	1810272	5722112	21887448	14df9d8	vmlinux
> 14354490	1810400	5722112	21887002	14df81a	vmlinux-patched
> 
> It's only a 574 byte savings. That's not much. I wish I had the config I
> used the first time. I may have had debug on that gave it a bigger
> impact.
> 
> Attached is the config:
> 
> -- Steve
> 

At least you got a decrease! Using your .config I got the same 574 byte
savings:

14310698        1810160 5722112 21842970        14d4c1a vmlinux-orig
14310124        1810288 5722112 21842524        14d4a5c vmlinux-new

I'm attaching my .config which is basically a defconfig with a few extra
configs for my h/w + kvm + ext4.

Thanks,

-Jason

Download attachment "jasons-config.bz2" of type "application/x-bzip2" (16491 bytes)