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

[Peter Zijlstra]

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.