linux-kernel - Re: [PATCHSET] cgroup: implement task_cgroup_path_from

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Date:	Sun, 14 Apr 2013 20:22:33 -0700
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com
Cc:	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kay@...y.org, greg@...ah.com,
	lennart@...ttering.net, daniel@...que.org
Subject: Re: [PATCHSET] cgroup: implement task_cgroup_path_from_hierarchy()

On Sun, Apr 14, 2013 at 11:36:55AM -0700, Tejun Heo wrote:
> 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-cgroup-refactor-hierarchy_id-handling.patch
>  0002-cgroup-drop-hierarchy_id_lock.patch
>  0003-cgroup-make-hierarchy_id-use-cyclic-idr.patch
>  0004-cgroup-implement-task_cgroup_path_from_hierarchy.patch
> 
> 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(-)

Heh, I must have been tripping or something.  89 > 41.  It's still a
lot cleaner tho. :)

-- 
tejun
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