Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace

From	Aravinda Prasad <aravinda@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace
Date	2016-07-12 11:30 +0200
Message-ID	<rU2aS-2Zl-31@gated-at.bofh.it> (permalink)
References	<rJZHk-7nr-19@gated-at.bofh.it> <rJZQZ-7rp-1@gated-at.bofh.it> <rOH73-2eF-9@gated-at.bofh.it>
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On Monday 27 June 2016 09:20 PM, Peter Zijlstra wrote:
> On Tue, Jun 14, 2016 at 10:19:51PM +0530, Aravinda Prasad wrote:
>> Whenever perf tool is executed inside a container, this
>> patch restricts the events to the perf-namespace in which
>> the perf tool is executing.
>>
>> This patch is based on the existing support available
>> for tracing with cgroups.
>>
>> TODO:
>>     - Avoid code duplication.
> 
> Can't you, at perf_event_open() time, convert a per-cpu event into a
> per-cpu-per-cgroup event for these namespace thingies?
> 
> That seems to immediately and completely remove all that duplication.

Sorry for the delay in the response.

I was looking into a way how a per-cpu event can be converted to
per-cpu-per-cgroup event at perf_event_open() but could not figure out
how to do this conversion. The cgroup event expects the fd of the cgroup
directory in cgroupfs and in this case we don't have any fd passed in.
Not sure if I am missing anything.

-- 
Regards,
Aravinda

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Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Aravinda Prasad <aravinda@linux.vnet.ibm.com> - 2016-07-12 11:30 +0200
  Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Peter Zijlstra <peterz@infradead.org> - 2016-07-12 13:50 +0200
    Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Nikolay Borisov <kernel@kyup.com> - 2016-07-12 14:50 +0200
      Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Peter Zijlstra <peterz@infradead.org> - 2016-07-12 15:10 +0200
        Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace ebiederm@xmission.com (Eric W. Biederman) - 2016-07-12 16:10 +0200
          Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Peter Zijlstra <peterz@infradead.org> - 2016-07-12 16:30 +0200
            Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Aravinda Prasad <aravinda@linux.vnet.ibm.com> - 2016-07-12 18:10 +0200
        Re: [RFC PATCH 2/2] perf: Filter events based on perf-namespace Aravinda Prasad <aravinda@linux.vnet.ibm.com> - 2016-07-12 18:30 +0200

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