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

Jason Baron
2013-08-05T20:06:51Z

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