linux-kernel - Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support

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Date:	Tue, 31 May 2016 17:00:16 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH perf/core v9 00/16] perf-probe --cache and SDT support

On Mon, 30 May 2016 13:30:53 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Mon, May 30, 2016 at 01:22:52PM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Sun, May 29, 2016 at 12:15:01AM +0900, Masami Hiramatsu escreveu:
> > > Hi,
> > > 
> > > Here is the 9th version of the patchset for probe-cache and 
> > > initial SDT support.
> > 
> > Ok, for completeness sake: Where does one learn more about "SDT", I
> > couldn't find a description of this in this patchkit, /me goes googling
> > around...
> 
> https://sourceware.org/gdb/onlinedocs/gdb/Static-Probe-Points.html
> 
> Some lifting of this text, giving credit and checking whatever license
> it is under would help, I think.

Hmm, would you mean we'd better add links(urls) in Documentation/perf-probe.txt?


> Mentioning some userland components that have such "Statically Defined
> Tracing" markers would also help testers to try it with this patchkit, I
> saw just one or two examples here, IIRC with libc and libstdc++.

Yeah, and it depends on the binary which your distro provides.
Fotunately, Redhat provided binaries usually enables SDTs :)

As you can see the below page, we can add a testcase for sdt in
perftool itself (this also requires sdt.h provided by systemtap-devel)

https://sourceware.org/systemtap/wiki/AddingUserSpaceProbingToApps

Then, user can run tests to ensure it.

Thank you!

> 
> - Arnaldo
>  
> > - Arnaldo
> >  
> > > The previous version is here; https://lkml.org/lkml/2016/5/14/107
> > > 
> > > This version just fixes 2 points according to Hemant's comment,
> > > and split out the filename__readable() patch.
> > > 
> > > Changes in v9:
> > >   - [1/16,2/16] split out the filename__readable()
> > >   - [7/16] Fix to show which event is deleted.
> > >   - [12/16] Update list_usage to show sdt option.
> > > 
> > > Thank you,
> > > 
> > > ---
> > > 
> > > Hemant Kumar (1):
> > >       perf/sdt: ELF support for SDT
> > > 
> > > Masami Hiramatsu (15):
> > >       perf-symbol: Introduce filename__readable to check readability
> > >       perf symbol: Cleanup the code flow of dso__find_kallsyms
> > >       perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
> > >       perf probe: Add --cache option to cache the probe definitions
> > >       perf probe: Use cache entry if possible
> > >       perf probe: Show all cached probes
> > >       perf probe: Remove caches when --cache is given
> > >       perf probe: Add group name support
> > >       perf buildid-cache: Scan and import user SDT events to probe cache
> > >       perf probe: Accept %sdt and %cached event name
> > >       perf-list: Show SDT and pre-cached events
> > >       perf-list: Skip SDTs placed in invalid binaries
> > >       perf probe: Allow wildcard for cached events
> > >       perf probe: Support @BUILDID or @FILE suffix for SDT events
> > >       perf probe: Support a special SDT probe format
> > > 
> > > 
> > >  tools/perf/Documentation/perf-probe.txt |   26 +-
> > >  tools/perf/builtin-list.c               |    6 
> > >  tools/perf/builtin-probe.c              |   30 ++
> > >  tools/perf/util/build-id.c              |  295 ++++++++++++++++--
> > >  tools/perf/util/build-id.h              |    8 
> > >  tools/perf/util/dso.h                   |    5 
> > >  tools/perf/util/parse-events.c          |   83 +++++
> > >  tools/perf/util/parse-events.h          |    2 
> > >  tools/perf/util/probe-event.c           |  492 +++++++++++++++++++++++++++---
> > >  tools/perf/util/probe-event.h           |    7 
> > >  tools/perf/util/probe-file.c            |  504 +++++++++++++++++++++++++++++++
> > >  tools/perf/util/probe-file.h            |   41 +++
> > >  tools/perf/util/symbol-elf.c            |  252 ++++++++++++++++
> > >  tools/perf/util/symbol.c                |   71 ++--
> > >  tools/perf/util/symbol.h                |   22 +
> > >  15 files changed, 1712 insertions(+), 132 deletions(-)
> > > 
> > > --
> > > Masami Hiramatsu


-- 
Masami Hiramatsu <mhiramat@...nel.org>