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

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Date:	Fri, 10 Jun 2011 16:17:08 +0900
From:	Akihiro Nagai <akihiro.nagai.hw@...achi.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	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, David Ahern <dsahern@...il.com>
Subject: Re: [PATCH -tip v4 0/7] perf: Introduce branch sub commands

(2011/05/26 22:28), 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.
OK.
I agreed that the core job is dumpimg BTS logs on perf script.

Next, I'd like to implement the perf-branch's functions and
additional interfaces to perf script.
For example, resoving symbols and dso about branch_to address and,
adding interfaces to get source file path, line number using debuginfo.

I presented about perf-branch's future plan in LinuxCon Japan 2011,
please refer the follwing slide.
http://events.linuxfoundation.org/events/linuxcon-japan/nagai
(The slide will be available soon)


Thank you.

>
> Thanks.
>



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