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

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Date:	Thu, 9 Apr 2015 15:57:01 -0400
From:	Jérémie Galarneau 
	<jeremie.galarneau@...icios.com>
To:	He Kuang <hekuang@...wei.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 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

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
>>>
>>
>
>



-- 
Jérémie Galarneau
EfficiOS Inc.
http://www.efficios.com
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