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

Ondřej Bílka
2013-08-07T05:13:06Z

On Tue, Aug 06, 2013 at 08:56:00PM -0400, Steven Rostedt wrote:
> On Tue, 2013-08-06 at 20:45 -0400, Steven Rostedt wrote:
>
> > [ 3.387362] short jumps: 106
> > [ 3.390277] long jumps: 330
> >
> > Thus, approximately 25%. Not bad.
>
> Also, where these happen to be is probably even more important than how
> many. If all the short jumps happen in slow paths, it's rather
> pointless. But they seem to be in some rather hot paths. I had it print
> out where it placed the short jumps too:
>

> The kmem_cache_* and the try_to_wake_up* are the hot paths that caught
> my eye.
>
> But still, is this worth it?
>
Add short_counter,long_counter and before increment counter before each
jump. That way we will know how many short/long jumps were taken.
> -- Steve
>