Re: FORTIFY_SOURCE for the kernel

["Mike A. Harris" <mharris mharris ca>]

Ralf Corsepius wrote:
> On Mon, 2006-01-23 at 12:31 -0500, Mike A. Harris wrote:
>
> > Ralf Corsepius wrote:
> >
> > > On Mon, 2006-01-23 at 07:53 -0600, Josh Boyer wrote:
> > >
> > >
> > > > > On Mon, 2006-01-23 at 11:30 +0900, Warren Togami wrote:
> > >
> > >
> > > > > Going off at a tangent....what would people think of the idea of
> > > > > switching to -Os in $RPM_OPT_FLAGS _after_ FC5 is released?
> > > >
> > > > If it results in some form of improvement in performance, I'm all for it.
> > >
> > >
> > > The "s" in -Os stands for "size", not for "speed". So if -Os compiled
> > > code-execution is faster than the default CFLAGS, something must be
> > > broken elsewhere.
> >
> > Not necessarily.  The reduced size of the executable makes more
> > efficient use of CPU cache, which can have a net result of increased
> > speed as well.
>
> I guess you have benchmarking code to prove this claim to upstream? ;)

Not personally, however other people at Red Hat do.

--
Mike A. Harris  *  Open Source Advocate  *  http://mharris.ca
                      Proud Canadian.