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

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Message-ID: <1331573227.25686.650.camel@gandalf.stny.rr.com>
Date:	Mon, 12 Mar 2012 13:27:07 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
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

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

Download attachment "config.gz" of type "application/x-gzip" (23035 bytes)