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

From: Steven Rostedt <rostedt@goodmis.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: LKML <linux-kernel@vger.kernel.org>, gcc <gcc@gcc.gnu.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	"H. Peter Anvin" <hpa@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	David Daney <ddaney.cavm@gmail.com>,
	Behan Webster <behanw@converseincode.com>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections
Date: Mon, 05 Aug 2013 15:16:39 -0400	[thread overview]
Message-ID: <1375730199.22073.135.camel@gandalf.local.home> (raw)
In-Reply-To: <87siyo3qna.fsf@tassilo.jf.intel.com>

On Mon, 2013-08-05 at 12:04 -0700, Andi Kleen wrote:
> Steven Rostedt <rostedt@goodmis.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