linux-kernel - Re: perf & rasd integration plan

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Date:	Sun, 5 Oct 2014 19:48:01 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Fu Wei <fu.wei@...aro.org>, Robert Richter <rric@...nel.org>,
	David Ahern <dsahern@...il.com>, Ingo Molnar <mingo@...nel.org>
Subject: Re: perf & rasd integration plan

Top-posting on purpose:

Btw, jolsa, if you get your LCE proposal for the perf splitting
approved, please post the time here so people can come.

Thanks.

On Tue, Sep 30, 2014 at 10:24:16AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Tue, Sep 30, 2014 at 11:06:21AM +0200, Jean Pihet escreveu:
> > The RAS Deamon (rasd) as available at [1] and the development version
> > at [2], allows to enable kernel tracepoints and outputs the
> > tracepoints fields according to the kernel format.
> > 
> > [1] https://git.kernel.org/cgit/utils/ras/rasd.git/
> > [2] https://git.linaro.org/people/jean.pihet/rasd.git
> > 
> > rasd currently is a duplicate of the perf tool code, ultimately perf
> > and rasd will use the same common code. The goal is to factor out the
> > common code from perf and place it in small librairies in tools/lib.
> > 
> > Here is the code that rasd currently uses and that should be moved to tools/lib:
> > 
> > - debugfs: already in tools/lib/api/fs
> >   . mount and retrieve path
> > 
> > - evlist: tools/perf/util/evlist.[ch]
> >   . create and init new evlist,
> >   . set cpu and thread maps,
> >   . add events to evlist,
> >   . init and use internal event id,
> >   . alloc and mmap events buffers, manage file descriptors,
> >   . enable events,
> >   . read events buffers, parse data,
> >   . unmap and free buffers
> > 
> > - evsel: tools/perf/util/evsel.[ch]
> >   . create and init new tracepoints events,
> >   . init and use internal event id,
> >   . open events, manage fds,
> >   . close and free events
> > 
> > - trace-event: tools/perf/util/trace-event.[ch] and
> >   tools/perf/util/trace-event-parse.c
> >   . retrieve and parse events format (using event-parse),
> >   . print out events fields
> > 
> > - event-parse: already in tools/lib/traceevent/event-parse.[ch]
> >   . retrieve and parse events format,
> >   . parse events format and print out events fields
> > 
> > - trace-seq: already in tools/lib/traceevent/trace-seq.c
> >   . format output string for event fields
> > 
> > - events plugins: already in tools/lib/traceevent/event-plugin.c
> > 
> > - util: tools/perf/util/util.[ch]
> >   . files open/read,
> >   . manage events attributes,
> >   . various macros
> > 
> > - test events attributes: tools/perf/tests/attr.c
> >   . test_attr__open()
> > 
> > - thread: tools/perf/util/thread_map.[ch] and
> > - cpu: tools/perf/util/cpumap.[ch]
> >   . init and manage process maps
> > 
> > - xyarray: tools/perf/util/xyarray.[ch]
> > 
> > - syscall: tools/perf/perf-sys.h
> > 
> > - cgroup: tools/perf/util/cgroup.[ch]
> > 
> > The plan is to move the small and generic functions first: util,
> > xyarray, cpumap, thread_map etc; then evlist, evsel, trace-event,
> > trace-event-parse; and finally integrate rasd into the tools/ dir.
> > 
> > Any thought? Can evlist, evsel etc. be moved at once?
> > 
> > Patches should come soon, when time allows.
> 
> Why don't you add it to tools/rasd/ and in tools/rasd/Makefile you just
> go on and add tools/perf/util/evlist.o et all to be linked directly, as
> a first step.
> 
> Then, as a second step, we can create a tools/lib/perf/evlist.c having
> what is currently used by both tools/perf/ and tools/rasd/, i.e. what is
> proven to be useful for something other than perf.
> 
> As the need arises, we go on moving things into tools/lib/perf/evlist.c
> et all from wherever it appeared first, be it from tools/rasd/,
> tools/perf/util/evlist.c or anywhere else.
> 
> Initial rule being that once it is used by multiple tools living in
> tools/, then it deserves a place in tools/lib/perf/.
> 
> Ditto for other stuff currently living in tools/perf/util/.
> 
> - Arnaldo
> 

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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