Re: [PATCH v3 00/10] x86: ORC unwinder (previously undwarf)

From: Mike Galbraith
Date: Wed Jul 12 2017 - 23:05:27 EST

On Wed, 2017-07-12 at 15:30 -0700, Andi Kleen wrote:
> Josh Poimboeuf <jpoimboe@xxxxxxxxxx> writes:
> >
> > The ORC data format does have a few downsides compared to DWARF. The
> > ORC unwind tables take up ~1MB more memory than DWARF eh_frame tables.
> >
> Can we have an option to just use dwarf instead? For people
> who don't want to waste a MB+ to solve a problem that doesn't
> exist (as proven by many years of opensuse kernel experience)

Sure the dwarf unwinder works well for crashes, but at the price of
demolishing ftrace/perf utility.