linux-kernel - Re: [RFC] gcc feature request: Moving blocks into sections

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Message-ID: <1375836304.25420.76.camel@gandalf.local.home>
Date:	Tue, 06 Aug 2013 20:45:04 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Tue, 2013-08-06 at 16:43 -0400, Steven Rostedt wrote:
> On Tue, 2013-08-06 at 16:33 -0400, Mathieu Desnoyers wrote:
> 
> > Steve, perhaps you could add a mode to your binary rewriting program
> > that counts the number of 2-byte vs 5-byte jumps found, and if possible
> > get a breakdown of those per subsystem ?
> 
> I actually started doing that, as I was curious to how many were being
> changed as well.

I didn't add it to the update program as that runs on each individual
object (needs to handle modules). But I put in the start up code a
counter to see what types were converted:

[    3.387362] short jumps: 106
[    3.390277]  long jumps: 330

Thus, approximately 25%. Not bad.

-- Steve


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