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SubjectRe: frame unwinder patches
On Fri, Sep 05, 2008 at 11:24:16AM +0200, Bernd Schubert wrote:
> On Thursday 04 September 2008 21:13:58 Andi Kleen wrote:
> > Bernd Schubert <bs@q-leap.de> writes:
> > > Hello,
> > >
> > > up to 2.6.22 the -mm series had these nice frame unwinder patches,
> > > which gave beautiful stack traces. Unfortunately these frame unwinder
> > > patches seem to have been dropped :(
> > >
> > > Anyone still maintaining updated patches?
> >
> > The SUSE kernel rpm should have an uptodate set
> >
> > (ftp.suse.com/pub/projects/kernel/HEAD )
> >
>
> Thanks Andi, found it! If someone else needs it, the correct path is
> ftp://ftp.suse.com/pub/projects/kernel/kotd/HEAD.

Thanks for the correction.

> > I agree that they were much better than the current unwinder,
> > also they didn't require slowing down the kernel with
> > frame pointers.
>
> What it the reason this patch isn't mainline? It provides better traces,
> doesn't slow down the kernel (which is important in our HPC envirement), so
> what is the disadvantage?

The initial version that was merged had a few teething problems because
it ran into tool chain bugs (which were quickly resolved). Unfortunately
it lead to a few people developing irrational fears of dwarf2 in the
process and it was reverted, annoying the original contributor.
Right now someone would just need to retry the submission I guess.

-Andi

--
ak@linux.intel.com


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