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

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Message-ID: <20170712214920.5droainfqjmq7sgu@alap3.anarazel.de>
Date:   Wed, 12 Jul 2017 14:49:20 -0700
From:   Andres Freund <andres@...razel.de>
To:     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>,
        Mike Galbraith <efault@....de>
Subject: Re: [PATCH v3 00/10] x86: ORC unwinder (previously undwarf)

Hi,

On 2017-07-11 10:33:37 -0500, Josh Poimboeuf wrote:
> The simpler debuginfo format also enables the unwinder to be much faster
> than DWARF, which is important for perf and lockdep.

Is this going to be usable for userland call-graphs as well? If one
converts dwarf to that, I mean? Because right now with perf dwarf is
often the only thing that works properly through libc, as libc isn't
compiled with fps and has hardcoded asm not preserving fp. lbr isn't
available for many events, and often not at all available in VMs etc.

Regards,

Andres