On Wed, Nov 02, 2005 at 12:48:52PM -0500, Dave Jones wrote:
> On Wed, Nov 02, 2005 at 07:54:04AM -0800, Linus Torvalds wrote:
>
> > > For your last suggestion, maybe someone can automate running Andi's
> > > bloat-o-meter? I think the hard part is maintaining comparable configs.
> >
> > Yes. And we should probably make -Os the default. Apparently Fedora
> > already does that by just forcibly hacking the Kconfig files.
>
> (excuse any typos, this wireless connection is god-awful)
> We do. We rip out the dependancyon CONFIG_EMBEDDED, and build
> with OPTIMISE_FOR_SIZE set. At least we usually do.
> Once every so often, we hit something which throws a spanner
> in the works, like the "x86-64 doesn't boot any more" problem
> that was fixed by the patch that Alexandre posted earlier
> this week.
>
> Most of the time now, when we hit bugs with -Os, it seems to be due
> to broken asm constraints in the kernel rather than actual
> gcc bugs, but of course, they also occur from time to time,
> whereas the same code works just fine with -O2.
> I think part of th reason for this is exactly because it
> doesn't get a great deal of testing.
Is the usage of -Os in Fedora based on actual measurements?
> Dave
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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