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

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Message-ID: <CAAkRFZLXLgqn8yE-07K=KM6YyZt3aLrvvjGL=u_=nK9S5HQ9rg@mail.gmail.com>
Date:	Mon, 5 Aug 2013 12:30:47 -0700
From:	Xinliang David Li <davidxl@...gle.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Andi Kleen <andi@...stfloor.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>,
	"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>,
	Rong Xu <xur@...gle.com>, Teresa Johnson <tejohnson@...gle.com>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Mon, Aug 5, 2013 at 12:16 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> 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 option works best with FDO.   FDOed linux kernel rocks :)

>>
>> 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 ;-)
>

There were lots of problems with this option -- recently cleaned
up/fixed by Teresa in GCC trunk.

thanks,

David

>
> 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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