[PATCHSET] cgroup: implement task_cgroup_path_from_hierarchy()

From: Tejun Heo
Date: Sun Apr 14 2013 - 14:37:14 EST

kdbus folks want a sane way to determine the cgroup path that a given
task belongs to on a given hierarchy, which is a reasonble thing to
expect from cgroup core.

This patchset make hierarchy_id allocation use idr instead of ida and
implement task_cgroup_path_from_hierarchy(). In the process, the
yucky ida cyclic allocation is replaced with idr_alloc_cyclic().


0001-0002 prepare for conversion to idr, which 0003 does.

0004 implements the new function.

This patchset is on top of next-20130412 as idr_alloc_cyclic() patch
is currently in -mm. Given that this isn't an urgent thing and the
merge window is just around the corner, it'd be probably best to route
these through cgroup/for-3.11 once v3.10-rc1 drops.

These patches are also available in the following git branch.

git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-task_cgroup_path_from_hierarchy

And it actually reduces LOC. Woot Woot.

include/linux/cgroup.h | 2
kernel/cgroup.c | 128 +++++++++++++++++++++++++++++++++----------------
2 files changed, 89 insertions(+), 41 deletions(-)

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