Messages in this thread | | | Date | Fri, 2 Sep 2016 15:59:36 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH v2 1/2] perf: add container identifier entry in perf sample data |
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On Fri, Sep 02, 2016 at 07:25:31PM +0530, Hari Bathini wrote: > >I'm thinking this value is mostly the same for tasks, just like COMM and > > I think so, too. Namespaces aren't changed that often for tasks... > > >MMAP. Could we therefore not emit (sideband) events whenever a task > >changes namespace and get the same information but with tons less data? > > You mean, something like PERF_RECORD_NAMESPACE that > emits events on fork, clone, setns..?
Yep.
> > >That also gives the possibility of recording all namespaces, not just > >the one. > > True. If we record all namespaces, container identifier interpretation > can be left to the userspace to decide, which is much more flexible...
The only complication is initial state, on record start you'd have to trawl /proc and generate 'fake' namespace records for all (relevant) tasks.
We do the same with MMAP records, we parse /proc/$pid/maps for that.
Is this namespace stuff available in /proc somewhere?
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