linux-kernel - Re: [PATCH -tip v4 0/7] perf: Introduce branch sub commands

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Message-ID: <4DE39C31.1070600@hitachi.com>
Date:	Mon, 30 May 2011 22:31:29 +0900
From:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Frederic Weisbecker <fweisbec@...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
Subject: Re: [PATCH -tip v4 0/7] perf: Introduce branch sub commands

(2011/05/27 1:24), David Ahern wrote:
>
>
> On 05/26/2011 07:28 AM, Frederic Weisbecker wrote:
>> (Adding David Ahern in Cc)
>>
>> Ok that's all good except this needs to use the "perf script" centralized
>> dump.
>>
>> Currently running "perf script" without an actual script dumps
>> the events by default, whatever kind of event they are: hardware,
>> software, tracepoints, ...
>> So we want the branch output to be supported there, so we can reuse
>> some code and interface.
>>
>> For example, "perf script -f branch:comm,tid,sym" would print the
>> comm, tid and the sym for to and from addresses.
>>
>> That's better than creating a new set of options in a new command
>> that people need to relearn while everybody could simply get
>> familiarized with common perf script options.
>>
>> Of course we can still have a "perf branch" command, which could
>> be a tiny shortcut that maps to perf record and perf script.
>>
>> Like:
>>
>> 	perf branch record
>> 	perf branch [trace] -f tid,sym,comm
>>
>> Would map to:
>>
>> 	perf record branch:u
>> 	perf script -f branch:tid,sym,comm
>>
>> And may be if one day we can do something more tricky than a
>> linear output for branches (like source code coloring/browsing),
>> then it may be implemented inside perf branch and not rely on
>> another subcommand. Until then we are only dealing with raw linear
>> dump, and that's a core job for perf script where we want to
>> centralize that kind of facility.
>
> I mentioned that when v3 was posted.
>
> The sample address can be converted to symbols and the output can be
> added to perf-script rather easily. Attached is an example. I was going
> to submit it back in April and got distracted. I'll rebase, move the
> addr->sym conversion to a function and submit later today.
OK.
I agreed with implementing it on perf script.
I'd like to try it.

Thank you.

>
> David
>
>>
>> Thanks.
>>
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