Messages in this thread | | | Subject | Re: [RFC PATCH 0/2] perf_events: add support for per-cpu per-cgroup monitoring (v3) | From | Peter Zijlstra <> | Date | Wed, 22 Sep 2010 09:27:59 +0200 |
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On Wed, 2010-09-22 at 09:53 +0530, Balbir Singh wrote: > Yes, a task can belong to multiple subsystems, hence multiple cgroups. > Ideally we'd want to use pid + subsystem
Apparently we create a perf subsystem, and we only care about that. So pid will uniquely identify a cgroup, since for each subsystem a task can only belong to one cgroup.
> > One thing we could do is pass this cgroup identifier in the pid field > > and use PERF_FLAG_CGROUP or something. Currently the syscall signature > > uses pid_t, but I think we can safely change that to int. > > Or union it and overload the field to contain either pid_t or fd of the cgroup
Its not a field, its an argument.
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