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

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Message-ID: <1375730199.22073.135.camel@gandalf.local.home>
Date:	Mon, 05 Aug 2013 15:16:39 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"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>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Mon, 2013-08-05 at 12:04 -0700, Andi Kleen wrote:
> Steven Rostedt <rostedt@...dmis.org> writes:
> 
> Can't you just use -freorder-blocks-and-partition?

Yeah, I'm familiar with this option.

> 
> This should already partition unlikely blocks into a
> different section. Just a single one of course.
> 
> FWIW the disadvantage is that multiple code sections tends
> to break various older dwarf unwinders, as it needs
> dwarf3 latest'n'greatest.

If the option was so good, I would expect everyone would be using it ;-)


I'm mainly only concerned with the tracepoints. I'm asking to be able to
do this with just the tracepoint code, and affect nobody else.

-- Steve


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