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

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Message-ID: <20170712224045.4bsa6vngowr72kzk@treble>
Date:   Wed, 12 Jul 2017 17:40:45 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Andres Freund <andres@...razel.de>
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 03:36:05PM -0700, Andres Freund wrote:
> Hi,
> 
> On 2017-07-12 17:32:25 -0500, Josh Poimboeuf wrote:
> > If you want perf to be able to use ORC instead of DWARF for user space
> > binaries, that's not currently possible, though I don't see any
> > technical blockers for doing so.  Perf would need to be taught to read
> > ORC data.
> 
> Right, that's what I was hoping for.
> 
> 
> > And I think it should be possible to convert DWARF to ORC, assuming the
> > DWARF data is trusted.  We could probably add an objtool subcommand for
> > that.
> 
> That'd be pretty helpful.

Can I ask why?  Is DWARF too slow, or is it something else?

-- 
Josh