linux-kernel - Re: New attempt at adding an disassembler to perf

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Date:   Thu, 19 Jan 2017 16:36:41 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: New attempt at adding an disassembler to perf

On Wed, Jan 18, 2017 at 05:41:45PM -0800, Andi Kleen wrote:
> A native disassembler in perf is very useful, in particular with perf script to trace 
> instruction streams, but also for other analysis. Previously I attempted
> to do this using the udis86 library, but that was rejected because:
> - udis86 was not maintained anymore and lacking recent instructions
> - udis86 is dynamically linked and gives a runtime dependency.
> Doing this needs a full disassembler, not just a decoder, so the existing
> instruction decoder cannot be used without major changes.
> 
> This patchkit addresses these issues.  Intel recently released an open source version
> of the XED disassembler library, which is used in many other Intel software.
> It is very well maintained, uptodate, and supports static linking, so there is no
> runtime dependency. This version adds XED support to perf, and uses it to implement
> assembler output in perf script. It also fixes a range of issues in the previous
> version, see the individual change logs.
> 
> Available in 
> git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-misc.git perf/xed-6

i dont see that...

[jolsa@...va perf]$ git branch -r | grep xed-
  ak/perf/xed-3
  ak/perf/xed-4

jirka

> 
> v1: First post of XED version
> v2: Change probing to not be default and support XED_DIR. Other cleanups
> based on review.
> v3: Use FEATURE_FLAGS_BASIC for probing
> 
> -Andi