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

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Message-ID: <520005D8.9080108@akamai.com>
Date:	Mon, 05 Aug 2013 16:06:48 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.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>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On 08/05/2013 02:39 PM, Steven Rostedt wrote:
> On Mon, 2013-08-05 at 11:20 -0700, Linus Torvalds wrote:
>
>> Of course, it would be good to optimize static_key_false() itself -
>> right now those static key jumps are always five bytes, and while they
>> get nopped out, it would still be nice if there was some way to have
>> just a two-byte nop (turning into a short branch) *if* we can reach
>> another jump that way..For small functions that would be lovely. Oh
>> well.
> I had patches that did exactly this:
>
>   https://lkml.org/lkml/2012/3/8/461
>
> But it got dropped for some reason. I don't remember why. Maybe because
> of the complexity?
>
> -- Steve

Hi Steve,

I recall testing your patches and the text size increased unexpectedly. 
I believe I correctly accounted for changes to the text size *outside* 
of branch points. If you do re-visit the series that is one thing I'd 
like to double check/understand.

Thanks,

-Jason
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