linux-kernel - Re: [PATCH 2/2] perf data: Fix ctf

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Date:	Fri, 10 Apr 2015 15:39:25 +0800
From:	He Kuang <hekuang@...wei.com>
To:	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>
CC:	Jiri Olsa <jolsa@...hat.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Jiri Olsa <jolsa@...nel.org>, <acme@...nel.org>,
	<a.p.zijlstra@...llo.nl>, <mingo@...hat.com>,
	Wang Nan <wangnan0@...wei.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] perf data: Fix ctf_writer setupenv failure

Hi, Jérémie
On 2015/4/10 3:57, Jérémie Galarneau wrote:
> Hi He,
>
> This commit should fix the problem:
>
> commit a0d129162d2fdd1a99553a6cfbdf4e77ad3f7334
> Author: Jérémie Galarneau <jeremie.galarneau@...icios.com>
> Date:   Thu Apr 9 14:57:44 2015 -0400
>
>      Fix: Allow the addition of environment fields to a frozen trace
>
>      Commit 7f800dc7 introduced a behavior change which made it
>      impossible to add environment fields to a frozen trace (after the
>      creation of a stream).
>
>      This fix makes it possible to add new fields to a trace's
>      environment while making it impossible to modify existing fields
>      hereby restoring CTF Writer's v1.2 behavior.
>
>      Signed-off-by: Jérémie Galarneau <jeremie.galarneau@...icios.com>
>
> Can you reproduce the problem with the latest Babeltrace master?
> Otherwise, is there a branch I can checkout to try it out?
>
> Jérémie

  By updating to the latest libbabeltrace which contains commit
a0d12916, perf ctf conversion works with or without my patch.
>
> On Thu, Apr 9, 2015 at 3:38 AM, He Kuang <hekuang@...wei.com> wrote:
>> On 2015/4/9 1:59, Jiri Olsa wrote:
>>> On Wed, Apr 08, 2015 at 12:49:20PM +0800, He Kuang wrote:
>>>> Due to babeltrace commit:
>>>>     7f800dc7c2a1 ("ir: make trace environment use bt_object")
>>>>
>>>> The trace->frozen flag is set in bt_ctf_trace_create_stream(), this flag
>>>> is checked before adding environment field to trace, and causes
>>>> ctf_writer__setup_env() failed. Fix this by setting all environment
>>>> fields before bt_ctf_trace_create_stream().
>>>>
>>>> Before this patch:
>>>>     $ perf data convert --to-ctf=ctf
>>>>     Error during CTF convert setup.
>>> have you tested with the latest babeltrace sources?
>>> this reminds me the bug they fixed recently, CCing Jeremie
>>>
>>> thanks,
>>> jirka
>>
>> Yes,  the latest babeltrace commit id:
>> dfdad2587b12d454e7235e01508a266d83e3e264
>>
>>>> After this patch:
>>>>     $ perf data convert --to-ctf=ctf
>>>>     [ perf data convert: Converted 'perf.data' into CTF data 'ctf' ]
>>>>     [ perf data convert: Converted and wrote 0.023 MB (596 samples) ]
>>>>
>>>> Signed-off-by: He Kuang <hekuang@...wei.com>
>>>> ---
>>>>    tools/perf/util/data-convert-bt.c | 30 ++++++++++++++++++++----------
>>>>    1 file changed, 20 insertions(+), 10 deletions(-)
>>>>
>>>> diff --git a/tools/perf/util/data-convert-bt.c
>>>> b/tools/perf/util/data-convert-bt.c
>>>> index a5b89b9..718dc8a 100644
>>>> --- a/tools/perf/util/data-convert-bt.c
>>>> +++ b/tools/perf/util/data-convert-bt.c
>>>> @@ -604,6 +604,22 @@ static int setup_events(struct ctf_writer *cw,
>>>> struct perf_session *session)
>>>>          return 0;
>>>>    }
>>>>    +static int ctf_writer__setup_stream(struct ctf_writer *cw)
>>>> +{
>>>> +       struct bt_ctf_stream            *stream;
>>>> +
>>>> +       /* CTF stream instance */
>>>> +       stream = bt_ctf_writer_create_stream(cw->writer,
>>>> cw->stream_class);
>>>> +       if (!stream) {
>>>> +               pr("Failed to create CTF stream.\n");
>>>> +               return -1;
>>>> +       }
>>>> +
>>>> +       cw->stream = stream;
>>>> +
>>>> +       return 0;
>>>> +}
>>>> +
>>>>    static int ctf_writer__setup_env(struct ctf_writer *cw,
>>>>                                   struct perf_session *session)
>>>>    {
>>>> @@ -725,7 +741,6 @@ static int ctf_writer__init(struct ctf_writer *cw,
>>>> const char *path)
>>>>    {
>>>>          struct bt_ctf_writer            *writer;
>>>>          struct bt_ctf_stream_class      *stream_class;
>>>> -       struct bt_ctf_stream            *stream;
>>>>          struct bt_ctf_clock             *clock;
>>>>          /* CTF writer */
>>>> @@ -767,15 +782,6 @@ static int ctf_writer__init(struct ctf_writer *cw,
>>>> const char *path)
>>>>          if (ctf_writer__init_data(cw))
>>>>                  goto err_cleanup;
>>>>    -     /* CTF stream instance */
>>>> -       stream = bt_ctf_writer_create_stream(writer, stream_class);
>>>> -       if (!stream) {
>>>> -               pr("Failed to create CTF stream.\n");
>>>> -               goto err_cleanup;
>>>> -       }
>>>> -
>>>> -       cw->stream = stream;
>>>> -
>>>>          /* CTF clock writer setup */
>>>>          if (bt_ctf_writer_add_clock(writer, clock)) {
>>>>                  pr("Failed to assign CTF clock to writer.\n");
>>>> @@ -830,6 +836,10 @@ int bt_convert__perf2ctf(const char *input, const
>>>> char *path, bool force)
>>>>          if (ctf_writer__setup_env(cw, session))
>>>>                  goto free_session;
>>>>    +     /* CTF writer trace stream setup */
>>>> +       if (ctf_writer__setup_stream(cw))
>>>> +               goto free_session;
>>>> +
>>>>          /* CTF events setup */
>>>>          if (setup_events(cw, session))
>>>>                  goto free_session;
>>>> --
>>>> 2.3.3.220.g9ab698f
>>>>
>>
>
>


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