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

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Message-ID: <1499914980.5107.18.camel@gmx.de>
Date:   Thu, 13 Jul 2017 05:03:00 +0200
From:   Mike Galbraith <efault@....de>
To:     Andi Kleen <andi@...stfloor.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>, Jiri Slaby <jslaby@...e.cz>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v3 00/10] x86: ORC unwinder (previously undwarf)

On Wed, 2017-07-12 at 15:30 -0700, Andi Kleen wrote:
> Josh Poimboeuf <jpoimboe@...hat.com> 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.

	-Mike