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

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Message-ID: <20130812161137.GU3008@twins.programming.kicks-ass.net>
Date:	Mon, 12 Aug 2013 18:11:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Mon, Aug 12, 2013 at 09:02:02AM -0700, Andi Kleen wrote:
> "H. Peter Anvin" <hpa@...ux.intel.com> writes:
> 
> > However, I would really like to
> > understand what the value is.
> 
> Probably very little. When I last looked at it, the main overhead in
> perf currently seems to be backtraces and the ring buffer, not this
> code.

backtraces do indeed blow and make pretty much everything else
irrelevant, but when not using them the branch forest was significant
when I last looked at it.
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