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

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Message-Id: <57A355C1.4090004@linux.vnet.ibm.com>
Date:	Thu, 4 Aug 2016 20:18:33 +0530
From:	Aravinda Prasad <aravinda@...ux.vnet.ibm.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Hari Bathini <hbathini@...ux.vnet.ibm.com>
Cc:	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



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.

Regards,
Aravinda

> 
> Eric
> 

-- 
Regards,
Aravinda