linux-kernel - Re: [PATCH 2/2] perf, tools, script: Add support for printing assembler

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Message-ID: <20160229102712.GA16241@krava.redhat.com>
Date:	Mon, 29 Feb 2016 11:27:12 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, namhyung@...nel.org,
	adrian.hunter@...el.com, alexander.shishkin@...el.com,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/2] perf, tools, script: Add support for printing
 assembler

On Fri, Feb 26, 2016 at 04:32:08PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> When dumping PT traces with perf script it is very useful to see the
> assembler for each sample, so that it is easily possible to follow
> the control flow.
> 
> As using objdump is difficult and inefficient from perf script this
> patch uses the udis86 library to implement assembler output.
> The library can be downloaded from http://udis86.sourceforge.net/
> 
> The library is probed as an external dependency in the usual way. Then perf
> script calls into it when needed, and handles callbacks to resolve
> symbols.
> 
> % perf record -e intel_pt//u true
> % perf script -F sym,symoff,ip,asm --itrace=i0ns | head
>      7fc7188b4190 _start+0x0	mov %rsp, %rdi
>      7fc7188b4193 _start+0x3	call _dl_start
>      7fc7188b7710 _dl_start+0x0	push %rbp
>      7fc7188b7711 _dl_start+0x1	mov %rsp, %rbp
>      7fc7188b7714 _dl_start+0x4	push %r15
>      7fc7188b7716 _dl_start+0x6	push %r14
>      7fc7188b7718 _dl_start+0x8	push %r13
>      7fc7188b771a _dl_start+0xa	push %r12
>      7fc7188b771c _dl_start+0xc	mov %rdi, %r12
>      7fc7188b771f _dl_start+0xf	push %rbx
> 
> Current issues:
> - Some jump references do not get resolved to symbols.
> - udis86 release does not support STAC/CLAC, which are used in the kernel,
> but there is a pending patch for it.
> 
> Cc: adrian.hunter@...el.com
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  tools/build/Makefile.feature             |   6 +-
>  tools/build/feature/Makefile             |   8 ++-
>  tools/build/feature/test-all.c           |   5 ++
>  tools/build/feature/test-udis86.c        |   8 +++

hi,
could you please split the udis86 detection from the rest?

thanks,
jirka

>  tools/perf/Documentation/perf-script.txt |   4 +-
>  tools/perf/builtin-script.c              | 108 +++++++++++++++++++++++++++++--
>  tools/perf/config/Makefile               |   5 ++
>  7 files changed, 134 insertions(+), 10 deletions(-)
>  create mode 100644 tools/build/feature/test-udis86.c

SNIP