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

[Linus Torvalds]

On Mon, Aug 5, 2013 at 12:04 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> Steven Rostedt <rostedt@xxxxxxxxxxx> writes:
>
> Can't you just use -freorder-blocks-and-partition?
>
> This should already partition unlikely blocks into a
> different section. Just a single one of course.

That's horrible. Not because of dwarf problems, but exactly because
unlikely code isn't necessarily *that* unlikely, and normal unlikely
code is reached with a small branch. Making it a whole different
section breaks both of those.

Maybe some "really_unlikely()" would make it ok.

                  Linus
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