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From: Mohamad Gebai <mohamad.gebai@polymtl.ca>
To: "Alex Bennée" <alex.bennee@linaro.org>
Cc: qemu-devel@nongnu.org, Mohamad Gebai <mohamad.gebai@gmail.com>
Subject: Re: [Qemu-devel] [RFC PATCH v3 4/5] Update documentation for LTTng ust tracing
Date: Fri, 18 Oct 2013 02:38:43 -0400	[thread overview]
Message-ID: <5260D773.4080302@polymtl.ca> (raw)
In-Reply-To: <p1iowwtfst.fsf@linaro.org>

On 13-10-17 05:20 AM, Alex Bennée wrote:
> mohamad.gebai@polymtl.ca writes:
>
>> On 13-10-16 08:05 AM, Alex Bennée wrote:
>>>>> Running this gives me:
>>>>>
>>>>> <quote>
>>>>> UST events:
>>>>> -------------
>>>>> None
>>>>> </quote>
>>>>>
>>>>> Before or after running qemu. What is the mechanism lttng expects to
>>>>> find out all these events?
>>>> Either the user should belong the group "tracing", or launch the
>>>> lttng-sessiond daemon (lttng-sessiond -d).
>>> <snip>
>>>
>>> Hmm I've done both and I get nothing still. I can enable all tracepoints
>>> though. This could just be a Ubuntu weirdness thing though.
>> That's weird. I did test it on a clean Ubuntu Precise (in a VM) and I
>> didn't have any problem after either one of these steps. Can you please
>> make sure that the user belongs to the "tracing" group and that the
>> lttng-sessiond daemon is running before running any instance of Qemu.
>> Also, Qemu should be running for LTTng to be able to list the events.
> Ahh that was it. I suggest you change the wording from:
>
> "Package lttng-tools is required for userspace tracing. After running Qemu, LTTng
> should be able to list all available events:"
>
> to
>
> "Package lttng-tools is required for userspace tracing. While running
> and instrumented Qemu, LTTng should be able to list all available events:"

Oops! Sorry about that.
>
>> Does lttng enable-event -a -u/start/stop/view show any event?
> Yes, as I said the rest worked fine. With that minor wording fix I'm happy.
>
> Thanks for getting this back into shape :-)
>
Happy to do it, I hope it will be useful to others.

Mohamad

  reply	other threads:[~2013-10-18  6:39 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-14 18:35 [Qemu-devel] [RFC PATCH v3 0/5] Fix UST backend for LTTng 2.x Mohamad Gebai
2013-10-14 18:35 ` [Qemu-devel] [RFC PATCH v3 1/5] Fix configure script " Mohamad Gebai
2013-10-16 12:06   ` Alex Bennée
2013-10-14 18:35 ` [Qemu-devel] [RFC PATCH v3 2/5] Modified the tracetool framework " Mohamad Gebai
2013-10-16 12:06   ` Alex Bennée
2013-10-14 18:35 ` [Qemu-devel] [RFC PATCH v3 3/5] Adapt Makefiles to the new LTTng ust interface Mohamad Gebai
2013-10-16 12:08   ` Alex Bennée
2013-10-17  1:04     ` Mohamad Gebai
2013-10-14 18:35 ` [Qemu-devel] [RFC PATCH v3 4/5] Update documentation for LTTng ust tracing Mohamad Gebai
2013-10-15 11:21   ` Alex Bennée
2013-10-15 16:07     ` Mohamad Gebai
2013-10-16 12:05       ` Alex Bennée
2013-10-17  1:02         ` Mohamad Gebai
2013-10-17  9:20           ` Alex Bennée
2013-10-18  6:38             ` Mohamad Gebai [this message]
2013-10-14 18:35 ` [Qemu-devel] [RFC PATCH v3 5/5] Add ust generated files to .gitignore Mohamad Gebai
2013-10-16 12:08   ` Alex Bennée

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