Re: [PATCH 3.15 33/37] Fix gcc-4.9.0 miscompilation of load_balance() in scheduler

Frank Ch. Eigler
2014-08-05T21:07:28Z

Hi -

> >>. I don't disagree it should be
> >> disabled by default, but making it unconditional is going to force the
> >> distributions that care about perf, systemtap, and debuggers to
> >> manually revert this.
> >
> > Bah. I bet I use 'perf' more than most, and it doesn't care about
> > debug info.

Actually, "perf probe" does (via HAVE_DWARF_SUPPORT), to place probes
and to extract variables at those probes, much as systemtap does.
Without var-tracking, probes placed at most interior points of
functions will make variables inaccessible.

Do you need a fully worked out example to see this?

- FChE