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SubjectRe: [PATCHSET cgroup/for-3.15] cgroup: prepare for the default unified hierarchy
On Thu, Mar 13, 2014 at 03:50:02PM -0400, Tejun Heo wrote:
> The planned unified hierarchy is just around the corner. We're gonna
> repurpose the dummy hierarchy to serve as the default unified
> hierarchy. Controllers which aren't attached to other hierarchies are
> already automatically bound to the dummy hierarchy; however, the dummy
> hierarchy is minimally initialized during boot and can't currently act
> as a full hierarchy.
> This patchset gradually turns the dummy hierarchy into fully
> functional default one and makes it mountable via selecting
> sane_behavior without any subsystems specified. While this patchset
> does make the default hierarchy mountable, the unified hierarchy
> functionality isn't implemented yet and cgroup creation in the default
> hierarchy is rejected for now.
> This lays down all the boilerplate work for the unified hierarchy.
> The next patchset will implement the actual unified functionality.
> This patchset contains the following eleven patches.
> 0001-cgroup-cgroup-subsys-should-be-cleared-after-the-css.patch
> 0002-cgroup-relocate-setting-of-CGRP_DEAD.patch
> 0003-cgroup-reorganize-cgroup-bootstrapping.patch
> 0004-cgroup-use-cgroup_setup_root-to-initialize-cgroup_du.patch
> 0005-cgroup-remove-NULL-checks-from-pr_cont_-cgroup_-name.patch
> 0006-cgroup-treat-cgroup_dummy_root-as-an-equivalent-hier.patch
> 0007-cgroup-move-subsys_mask-from-cgroupfs_root-to-cgroup.patch
> 0008-cgroup-rename-cgroup_dummy_root-and-related-names.patch
> 0009-cgroup-drop-const-from-buffer-of-cftype-write_string.patch
> 0010-cgroup-make-cgrp_dfl_root-mountable.patch
> 0011-cgroup-implement-CFTYPE_ONLY_ON_DFL.patch

Applied 0002-0011 to libata/for-3.15. 0001 has the possibility to
make css iterators malfunction as they don't exect the csses to be
NULL. It will be applied after iterators are updated to handle NULL



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