linux-kernel - Re: Q: perf log mode?

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Message-ID: <20110113082608.GE3031@tugrik.mns.mnsspb.ru>
Date:	Thu, 13 Jan 2011 11:26:08 +0300
From:	Kirill Smelkov <kirr@....spb.ru>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: Q: perf log mode?

On Wed, Jan 12, 2011 at 02:30:22PM -0200, Arnaldo Carvalho de Melo wrote:
> Em Wed, Jan 12, 2011 at 04:02:33PM +0100, Peter Zijlstra escreveu:
> > On Wed, 2011-01-12 at 17:59 +0300, Kirill Smelkov wrote:
> > > 
> > > Anyway, maybe something like this could be useful?
> > > 
> > I guess that would be ok, but I'll leave that to Arnaldo.
> 
> It is OK, I'll apply it to my perf/core, for the next merge window.

Thanks


> > Also note that Arnaldo is revamping the whole script interface to make
> > it possible to open and use the perf fds from the script language itself
> > (the only sane way), completely removing the dependency on perf-record.
> 
> Yep, I'm librarising the ad-hoc counter creation routines we have in
> stat, top and record, factoring the common parts, etc, and creating
> 'perf test' regression test routines for these new library functions.
> 
> After I finish the mmap bits, which should be soon, I'll start work on
> having a python binding for these routines and experiment plugging it to
> some other projects I worked on.
> 
> I'll also work on converting a few of the scripts we have to provide
> examples of use of this python binding.
> 
> Other bindings and a C library can come later, after we settle on an API
> using the python binding as the guinea pig.
> 
> Parts of this got into this merge window, for instance, perf stat uses
> the perf_evsel api to open and read counters, and perf test has new
> routines to stress them, new stuff I'm stashing at the perf/test branch
> in:
> 
> http://git.kernel.org/?p=linux/kernel/git/acme/linux-2.6.git;a=shortlog;h=refs/heads/perf/test

Thanks for heads up and good luck with libification,

Kirill
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