Re: [linuxtools-dev] Lttng2 issue

[Alexandre Montplaisir <alexandre.montplaisir@xxxxxxxxxx>]

On 12-07-31 07:57 PM, Zhang, Jessica wrote:
> Hi Alexandre,
>
> When setting the lttng trace type only Generic CTF Trace is available, there's no kernel type option for me.  I think the plug-in has the capability to figure out the type option since the other day when I played with kernel tracing data, I only see Kernel Trace option.

The "Kernel Trace" is shipped in a separate plugin/feature. In Eclipse's
"Install New Software" dialog, it's called "LTTng Kernel Analysis". If
this part is not installed, the Kernel Trace type won't be available.

The trace import dialog should list all the types that are currently
available in the installation. Eventually we'll try to implement some
sort of auto-detection (or at least, highlight the types that are known
to be compatible with the selected trace).

>
> BTW, I believe I'm using the latest lttng2.  I'm attaching my tracing folder, so can you try to import it?

Strangely, I was able to import your trace fine, both as a Generic Trace
or as a Kernel Trace. That was with Eclipse 4.2 and Linux Tools 1.0
installed from the Eclipse repo.
I also tried with the current git master. There it imports fine as a
Generic Trace too, and correctly fails if I try the Kernel type (that
one would never fail in 1.0).

It's a relatively big trace too, ~265k events, so it's probably not the
1-packet bug I was mentioning earlier.

I'm wondering:
- Are you using Eclipse 3.8 or 4.2? On which distro?
- Can you try with Linux Tools 1.1? Most of the validation code was
(re)written then, so it could have fixed your issue.


Cheers,
Alexandre

>
> Thanks,
> Jessica
>
> -----Original Message-----
> From: Alexandre Montplaisir [mailto:alexandre.montplaisir@xxxxxxxxxx]
> Sent: Tuesday, July 31, 2012 4:38 PM
> To: Zhang, Jessica
> Cc: Linux Tools developer discussions
> Subject: Re: [linuxtools-dev] Lttng2 issue
>
> Hi Jessica,
>
> There was a known bug in 1.0 where it would fail to validate a trace if it contained a stream with only 1 packet . This is often the case with small UST traces, since those do not have a lot of events.
>
> As a workaround, you can use the "Common Trace Format -> Kernel Trace"
> type. Some views will be empty, but the histogram, events table and statistics should work.
> Alternatively, you could update to Linux Tools 1.1. Instructions at http://wiki.eclipse.org/Linux_Tools_Project/PluginInstallHelp
>
> If either method does not fix your problem, please let us know, you might be hitting something else.
>
>
> Cheers,
> Alexandre
>
>
>
> On 12-07-31 06:33 PM, Zhang, Jessica wrote:
>> Hi,
>>
>>
>>
>> I've created an user space tracing with lttng2.0.  The trace data are
>> captured under
>>
>> /lttng-traces/mysession-20120731-150610/ust/lt-hello-2718-20120731-150
>> 646$
>>
>> As:
>>
>> channel0_0  channel0_2  channel0_4  channel0_6  metadata
>>
>> channel0_1  channel0_3  channel0_5  channel0_7
>>
>>
>>
>> So in my eclipse tracing project, I tried to import the data by selecting the tracing data folder, and under Traces, it only list 1 which is lt-hello-2718-20120731-150646.  When I tried to select trace type as "Common Trace Format->Generic CTF Trace", I'm getting "Type could not be set for one or more traces".  If I import each individual files, e.g. channel0_0 and assign trace type for it, I'm also getting the same error.
>>
>>
>>
>> BTW, the trace is generated using the latest stable lttng ust packages
>> which is 2.0.4. And my lttng is of 1.0.0.201207261918
>>
>>
>>
>> So what am I missing here?
>>
>>
>>
>> Thanks,
>>
>> Jessica
>>
>>
>

-- 
Alexandre Montplaisir
DORSAL lab,
École Polytechnique de Montréal