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

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Message-ID: <20170712224759.a32747n3oso245ij@treble>
Date:   Wed, 12 Jul 2017 17:47:59 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
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>,
        Mike Galbraith <efault@....de>
Subject: Re: [PATCH v3 00/10] x86: ORC unwinder (previously undwarf)

On Wed, Jul 12, 2017 at 03:30:31PM -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)
> 
> As far as I can tell this whole thing has only downsides compared
> to the dwarf unwinder that was earlier proposed. I don't see
> a single advantage.

Improved speed, reliability, maintainability.  Are those not advantages?

-- 
Josh