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Re: [PATCH 10/11] perf tools: Add probing for udev86 library

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> 
> Yeah, so udis86 also seems to be a pretty old, relatively stale library with no 
> support for new instructions AFAICS.

There are lots of new instructions in pull requests on github.

But yes the author seems to be a bit slow in pulling.

> 
> So I'd rather encourage librarizing one of the x86 instruction decoders in 
> arch/x86/, and adding pretty-printing functionality to it. The code can already 
> see instruction boundaries, which is the hardest part.
> 
> That would also be better supported on non-x86 architectures in the long run:
> 
>  triton:~/tip> find arch/ -name insn.c | xargs ls -l
>  -rw-rw-r-- 1 mingo mingo 30244 Mar 29 11:24 arch/arm64/kernel/insn.c
>  -rw-rw-r-- 1 mingo mingo  1347 Dec  8 06:27 arch/arm/kernel/insn.c
>  -rw-rw-r-- 1 mingo mingo 15123 Mar 30 12:31 arch/x86/lib/insn.c
> 
> Such an in-kernel-repo library could also be used by live kernel debuggers such as 
> kgdb/kdb, oops/crash-time disassembly printout, etc.
> 
> ... so how about that direction instead?

It's a major project. Who is gonna work on it? Are you volunteering?

Longer term I agree it would be reasonable (if someone can be found to work on it),
but short term udis86 is there and works today.

-Andi

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[GIT PULL 00/11] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 09/11] perf tools: Add support for skipping itrace instructions Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 08/11] perf script perl: Perl scripts now get a backtrace, like the python ones Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 01/11] perf mem: Add -U/-K (--all-user/--all-kernel) options Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 05/11] perf config: Remove duplicated set_buildid_dir calls Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 11/11] perf script: Add support for printing assembler Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 02/11] perf tools: Make hists__collapse_insert_entry static Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 07/11] perf config: Rename 'v' to 'home' in set_buildid_dir() Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 03/11] perf tools: Make -f/--force option documentation consistent across tools Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 10/11] perf tools: Add probing for udev86 library Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
    Re: [PATCH 10/11] perf tools: Add probing for udev86 library Ingo Molnar <mingo@kernel.org> - 2016-03-30 12:50 +0200
      Re: [PATCH 10/11] perf tools: Add probing for udev86 library Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-03-30 15:40 +0200
        Re: [PATCH 10/11] perf tools: Add probing for udev86 library Ingo Molnar <mingo@kernel.org> - 2016-03-30 16:00 +0200
          Re: [PATCH 10/11] perf tools: Add probing for udev86 library Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 16:20 +0200
            Re: [PATCH 10/11] perf tools: Add probing for udev86 library Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 16:50 +0200
              Re: [PATCH 10/11] perf tools: Add probing for udev86 library Ingo Molnar <mingo@kernel.org> - 2016-03-31 08:40 +0200
          Re: [PATCH 10/11] perf tools: Add probing for udev86 library Andi Kleen <ak@linux.intel.com> - 2016-03-30 17:10 +0200
            Re: [PATCH 10/11] perf tools: Add probing for udev86 library Ingo Molnar <mingo@kernel.org> - 2016-03-31 09:00 +0200
      Re: [PATCH 10/11] perf tools: Add probing for udev86 library Andi Kleen <ak@linux.intel.com> - 2016-03-30 16:50 +0200
  [PATCH 06/11] perf config: Rework buildid_dir_command_config to perf_buildid_config Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200
  [PATCH 04/11] perf tests: Add test to check for event times Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-03-30 01:50 +0200

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