Quoting Tejun Heo (t...@kernel.org):
> Hello,
> 
> On Mon, Jun 27, 2016 at 3:10 PM, Topi Miettinen <toiwo...@gmail.com> wrote:
> > I'll have to study these more. But from what I saw so far, it looks to
> > me that a separate tool would be needed to read taskstats and if that
> > tool is not taken by distros, the users would not be any wiser, right?
> > With cgroup (or /proc), no new tools would be needed.
> 
> That is a factor but shouldn't be a deciding factor in designing our
> user-facing interfaces. Please also note that kernel source tree
> already has tools/ subdirectory which contains userland tools which
> are distributed along with the kernel.

And, if you take audit+cgroup approach then no tools are needed.  So long
as you can have audit print out the cgroups for a task as part of the
capability audit record.
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