linux-kernel - Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

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Date:	Mon, 11 Apr 2011 13:54:19 +0900
From:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	David Ahern <dsahern@...il.com>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	pp-manager@....hitachi.co.jp, Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH -tip v3 3/6] perf branch trace: print pid and command

(2011/04/06 21:52), Frederic Weisbecker wrote:
> On Mon, Apr 04, 2011 at 07:00:40PM +0900, Akihiro Nagai wrote:
>> (2011/04/02 0:13), Frederic Weisbecker wrote:
>>> On Mon, Mar 28, 2011 at 08:31:23AM -0600, David Ahern wrote:
>>>> On 03/28/11 04:34, Akihiro Nagai wrote:
>>>>> >from is sample->ip? to is sample->addr? In the above example
>>>>>> 0x39d3015260 is the value from sample->addr, 1526f is sample->ip which
>>>>>> resolves to _dl_next_ld_env_entry from /lib64/ld-2.13.so.
>>>>> Yes.
>>>>> In this example, resolved address is only sample->ip (branch from).
>>>>> We need the resolved address of sample->addr (branch to) too, because
>>>>> both of them are addresses of execution code.
>>>>
>>>> Ok, now I understand. In that case add conversion of sample->addr to
>>>> symbols to perf-script.
>>>
>>> I agree that we should rather use perf script for branch dumps.
>>> Sorry Akihiro, I think we suggested you to create this dedicated
>>> perf branch by the past. But then perf script became the vanilla dump
>>> tool in the middle and it seems more suitable today.
>>>
>>> We can still create a perf branch later in order to produce some more
>>> advanced post-processing tools. But for sample dumps perf script (which starts
>>> to show itself as a misnomer BTW) seems to be the right place.
>> Finally, I would like to create coverage test tools using BTS on perf.
>> I'm working on the project "Btrax" that is a coverage test tool using BTS.
>> The URL is: http://sourceforge.net/projects/btrax/
>
> Cool, what is this tool doing? How is it different from perf branch?
Btrax provides following functions by analyzing BTS logs.
  1. Show executed/unexecuted codes with colors in HTML.
  2. Calculate the ratio of executed codes and all codes of tracee programs.

Finally, I would like to add similar functions to Btrax to perf branch.
Because,
  1. I think the combination of BTS and other perf functions realizes
     cool stuff.
  2. Currently, Btrax is out of tree. So, some people cannot use it
     because of unsupported kernel versions. I want many people to use it.

>
>>
>> And, I would like to implement other functions on perf-branch too.
>> For example, call graph, source code browser like perf-annotate which
>> can show executed codes.
>> So, I wolud like to continue to develop perf-branch.
>
> And you're very welcome to do so. Such features have a nice potential
> I think.
Thank you. I believe it too.

>
> Thanks.

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