linux-kernel - Re: [PATCH perf/core v8 00/16] perf-probe --cache and SDT support

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Message-ID: <573E97BD.20405@linux.vnet.ibm.com>
Date:	Fri, 20 May 2016 10:21:09 +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>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: [PATCH perf/core v8 00/16] perf-probe --cache and SDT support



On 05/15/2016 08:49 AM, Masami Hiramatsu wrote:
> Hi,
>
> Here is the 8th version of the patchset for probe-cache and
> initial SDT support.
>
> The previous version is here; https://lkml.org/lkml/2016/5/11/446
>
> This version I droped the second patch in v7 because it may
> involves unintended behavior change and we'd better discuss it
> out of this series. I also added comments why we can't use
> access(R_OK) for /proc/kcore.
>
> Hemant, could you review and test this series so that we can
> proceed to your patch depending on this?

So, apart from the two issues which I mentioned in
the individual patches, it seems fine.

However, I think we will need a bit detailed documentation for the
probe cache feature as well as for the SDT support, given that we
have different commands to add {probe,sdt} events for a binary
and use them. I will write that that doc up based on your next
version.

>
> Thank you,
>
> ---
>
> Hemant Kumar (1):
>        perf/sdt: ELF support for SDT
>
> Masami Hiramatsu (15):
>        perf buildid: Introduce DSO__NAME_KALLSYMS and DSO__NAME_KCORE
>        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-buildid-cache.c      |    8
>   tools/perf/builtin-list.c               |    4
>   tools/perf/builtin-probe.c              |   30 ++
>   tools/perf/util/annotate.c              |    2
>   tools/perf/util/build-id.c              |  295 ++++++++++++++++--
>   tools/perf/util/build-id.h              |    8
>   tools/perf/util/dso.h                   |    5
>   tools/perf/util/machine.c               |    2
>   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            |  502 +++++++++++++++++++++++++++++++
>   tools/perf/util/probe-file.h            |   41 +++
>   tools/perf/util/symbol-elf.c            |  252 ++++++++++++++++
>   tools/perf/util/symbol.c                |   73 ++---
>   tools/perf/util/symbol.h                |   25 ++
>   18 files changed, 1719 insertions(+), 138 deletions(-)
>
> --
> Masami Hiramatsu
>

-- 
Thanks,
Hemant Kumar