linux-kernel - Re: [patch 0/4] perf_counter tools: support annotation of live kernel modules

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Message-Id: <1246606304.2322.7.camel@jaswinder.satnam>
Date:	Fri, 03 Jul 2009 13:01:44 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/4] perf_counter tools: support annotation of live
 kernel modules

On Fri, 2009-07-03 at 09:24 +0200, Ingo Molnar wrote:
> * Mike Galbraith <efault@....de> wrote:
> 
> > On Thu, 2009-07-02 at 14:10 +0200, Peter Zijlstra wrote:
> > > On Thu, 2009-07-02 at 09:17 +0200, Mike Galbraith wrote:
> > > 
> > > >  I've been pondering a perf archive tool
> > > > that would package everything that's needed to do analysis on a
> > > > different box.  One big problem though, is that while you can easily
> > > > package vmlinux and modules, what about all the userland binaries?  A
> > > > large perf.data and/or debug info binaries can easily make transport
> > > > impractical enough.
> > > 
> > > I would simply extend the current file header with another section in
> > > which we do a structured storage of the data structures we currently
> > > build in perf-report. That is, the dso and symbol bits.
> > > 
> > > If we then run perf-report on a file containing such a section we read
> > > that data instead of trying to locate them the regular way.
> > 
> > That's a good idea.
> > 
> > If uname doesn't match stored record time uname, you're not live, 
> > so tools require an exportable perf.data.  If you're not live and 
> > not on the same host, annotate requires binaries appended via an 
> > export tool with --sym-filter -k -u -% whatever capability.
> 
> 'perf export' could be a nice shortcut to convert a local perf.data 
> into a off-line analysable body of data.
> 

I think it should be in both ways.

perf export and perf import

--
JSR

http://userweb.kernel.org/~jaswinder/


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