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| author | Tejun Heo <tj@kernel.org> | 2014-02-12 15:29:49 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-02-12 15:29:49 +0100 |
| commit | 21a2d3430ba8c188af405a5c2eb9c06bdcb6add6 (patch) | |
| tree | 7fc1d9be2e3297a53c64c7599bf2760cacbf6187 /kernel/sched/debug.c | |
| parent | cgroup: remove cftype_set (diff) | |
| download | linux-21a2d3430ba8c188af405a5c2eb9c06bdcb6add6.tar.xz linux-21a2d3430ba8c188af405a5c2eb9c06bdcb6add6.zip | |
cgroup: simplify dynamic cftype addition and removal
Dynamic cftype addition and removal using cgroup_add/rm_cftypes()
respectively has been quite hairy due to vfs i_mutex. As i_mutex
nests outside cgroup_mutex, cgroup_mutex has to be released and
regrabbed on each iteration through the hierarchy complicating the
process. Now that i_mutex is no longer in play, it can be simplified.
* Just holding cgroup_tree_mutex is enough. No need to meddle with
cgroup_mutex.
* No reason to play the unlock - relock - check serial_nr dancing.
Everything can be atomically while holding cgroup_tree_mutex.
* cgroup_cfts_prepare() is replaced with direct locking of
cgroup_tree_mutex.
* cgroup_cfts_commit() no longer fiddles with locking. It just
applies the cftypes change to the existing cgroups in the hierarchy.
Renamed to cgroup_cfts_apply().
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/sched/debug.c')
0 files changed, 0 insertions, 0 deletions