linux-kernel - Re: [PATCH perf/core v4 00/19] perf-probe --cache and SDT support

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Message-ID: <5720DC8E.4020802@linux.vnet.ibm.com>
Date:	Wed, 27 Apr 2016 21:06:46 +0530
From:	Hemant Kumar <hemant@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <mhiramat@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH perf/core v4 00/19] perf-probe --cache and SDT support

Hi Masami,

On 04/26/2016 02:32 PM, Masami Hiramatsu wrote:
> Hi,
>
> Here is the 4th version of the patchset for probe-cache and
> initial SDT support which are going to be perf-cache finally.

Applied your patches and tested them. I have a few questions/
suggestions on some of the patches.

> The previous version is here; https://lkml.org/lkml/2015/8/15/52
>
> This version fixes some bugs and improve wildcard support (
> including automatic target binary selection, we don't need
> -x option for SDT/pre-cached events any more :) ),
> and drops perf-record support currently because it seems more
> work on cleanup side.
>
> BTW, since I couldn't find list_dir function in Arnaldo's mail,
> so this series still have a patch to add lsdir().
>
> Note that all SDT events have "sdt_" prefix on the provider name,
> because of easier to distinguish between other named caches.
>
> TODOs:
>   - (perf record) Support SDT event recording directly
>   - (perf record) Support @FILE/@...LDID suffix to record specific SDTs.
>   - (perf record) Try to unregister SDT events after record.
>   - (ftrace) Support multiple SDTs on single event.
>
> Done:
>   - (perf probe) Allow glob matching for pre-cached events.
>   - (perf probe) Removes -x option when using pre-cached events.
>   - (perf probe) Support @FILE/@...LDID suffix for pre-cached events.
>   - (perf buildid-cache) Fallback to old style buildid-cache.
>
> Thank you,
>
>
> ---
>
> Hemant Kumar (1):
>        perf/sdt: ELF support for SDT
>
> Masami Hiramatsu (18):
>        perf probe: Use strbuf for making strings
>        perf-buildid-cache: Use path/to/bin/buildid/elf instead of path/to/bin/buildid
>        perf buildid-cache: Fall back to the old style build-id cache
>        perf: Add lsdir to read a directory
>        perf-buildid-cache: Use lsdir for looking up buildid caches
>        perf-probe: Let probe_file__add_event return 0 if succeeded
>        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-probe: Set default kprobe group name if it is not given
>        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
>
>
>   tools/perf/Documentation/perf-probe.txt |   24 +
>   tools/perf/builtin-list.c               |    4
>   tools/perf/builtin-probe.c              |   30 +
>   tools/perf/util/build-id.c              |  278 ++++++++++--
>   tools/perf/util/build-id.h              |    6
>   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           |  692 ++++++++++++++++++++++---------
>   tools/perf/util/probe-event.h           |    9
>   tools/perf/util/probe-file.c            |  495 ++++++++++++++++++++++
>   tools/perf/util/probe-file.h            |   32 +
>   tools/perf/util/probe-finder.c          |   14 -
>   tools/perf/util/symbol-elf.c            |  252 +++++++++++
>   tools/perf/util/symbol.c                |   15 -
>   tools/perf/util/symbol.h                |   22 +
>   tools/perf/util/util.c                  |   34 ++
>   tools/perf/util/util.h                  |    4
>   18 files changed, 1725 insertions(+), 276 deletions(-)
>
> --
> Masami Hiramatsu
>

-- 
Thanks,
Hemant Kumar