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

[Akihiro Nagai]

(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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