Re: Question about LTTng Context

[Michael Jeanson via lttng-dev <lttng-dev@lists.lttng.org>]

On 12/11/25 09:30, Kienan Stewart via lttng-dev wrote:
> Hi Amir,
> 
> On 12/10/25 9:40 PM, Amir Najafi Zadeh via lttng-dev wrote:
>> Hello everyone,
>>
>> I hope you’re doing well. My name is Amir, and I’m a PhD student in 
>> the Computer Science department at Stony Brook University, New York.
>>
>> I have a question about the LTTng context that I haven’t been able to 
>> find an answer for in the docs or man pages. Does LTTng support adding 
>> the cgroup ID or cgroup path as a context field? I want to filter my 
>> trace results based on cgroups.
>>
> 
> I think you're looking for the `cgroup_ns` context which adds the inum 
> of the cgroup namespace as a context field.

This will give you the ID of the cgroup namespace but we don't have 
contexts for cgroups themselves. It's probably something we would like 
to have but there is no concrete plans on implementing this at the moment.

> 
>> If this isn’t supported, are there any plans to add it in future 
>> versions, such as 2.14?
>>
>> For reference, I’m currently using LTTng 2.13 on Ubuntu 24.04 with 
>> kernel 6.8.0-87-generic.
>>
>> Cheers,
>> Amir
>> -- 
>> *Amirhossein Najafizadeh*
>> *PhD Student, Computer Science Department, Stony Brook University, N.Y.
>> File systems and Storage Lab (FSL)