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

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Date:	Thu, 04 Aug 2016 13:27:49 -0500
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Aravinda Prasad <aravinda@...ux.vnet.ibm.com>
Cc:	Hari Bathini <hbathini@...ux.vnet.ibm.com>, daniel@...earbox.net,
	peterz@...radead.org, linux-kernel@...r.kernel.org,
	acme@...nel.org, alexander.shishkin@...ux.intel.com,
	mingo@...hat.com, paulus@...ba.org, kernel@...p.com,
	rostedt@...dmis.org, viro@...iv.linux.org.uk, ananth@...ibm.com,
	Linux Containers <containers@...ts.linux-foundation.org>
Subject: Re: [RFC PATCH v2 0/3] perf/tracefs: Container-aware tracing support

Aravinda Prasad <aravinda@...ux.vnet.ibm.com> writes:

> On Thursday 04 August 2016 08:29 AM, Eric W. Biederman wrote:
>> Hari Bathini <hbathini@...ux.vnet.ibm.com> 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