On 2014/3/14 3:50, Tejun Heo wrote:
> Hello,
>
> 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
>
> 0001-0002 are misc fix / prep.
>
> 0003-0009 (mostly) turn the dummy hierarchy into a full hierarchy
> which takes on controllers which aren't attached to other hierarchies.
>
> 0010-0011 make the default hierarchy mountable and implement
> CFTYPE_ONLY_DFL.
>
> This patchset is on top of cgroup/for-3.15 b8dadcb58d54 ("cpuset: use
> rcu_read_lock() to protect task_cs()"). diffstat follows.
>
> block/blk-throttle.c | 4
> block/cfq-iosched.c | 4
> include/linux/cgroup.h | 57 ++---
> kernel/cgroup.c | 464 +++++++++++++++++++++++++---------------------
> kernel/cgroup_freezer.c | 2
> kernel/cpuset.c | 2
> mm/hugetlb_cgroup.c | 2
> mm/memcontrol.c | 4
> net/core/netprio_cgroup.c | 2
> net/ipv4/tcp_memcontrol.c | 2
> security/device_cgroup.c | 4
> 11 files changed, 295 insertions(+), 252 deletions(-)
>
Looks good in general!
Acked-by: Li Zefan <lizefan@xxxxxxxxxx>
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