Re: [RFC PATCH v2 0/3] perf/tracefs: Container-aware tracing support

[Eric W. Biederman]

Aravinda Prasad <aravinda@xxxxxxxxxxxxxxxxxx> writes:

> On Thursday 04 August 2016 08:29 AM, Eric W. Biederman wrote:
>> Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx> writes:
>> 
>>> This RFC patch set supports filtering container specific events
>>> when perf tool is executed inside a container. The patches apply
>>> cleanly on v4.7.0-rc7
>>>
>>> Changes from v1:
>>> 1/3. Revived earlier approach[1] with cgroup namespace instead
>>>      of pid namespace
>>> 2/3. New patch that adds instance support for uprobe events in
>>>      tracefs filesystem
>>> 3/3. New patch that adds "newinstance" mount option for tracefs
>>>      filesystem
>>        "newinstace" ick no.
>> 
>> I see no justification anywhere why the perf cgroup is not enough for
>> this.
>
> perf cgroup is not enough for uprobes, because even with perf cgroups a
> user within a container can still list/delete uprobes registered in
> other containers.

Just to be clear, even if there is one cgroup per container?

Eric