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cgroup: replace __DEVEL__sane_behavior with cgroup2 fs type

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With major controllers - cpu, memory and io - shaping up for the
unified hierarchy, cgroup2 is about ready to be, gradually, released
into the wild.  Replace __DEVEL__sane_behavior flag which was used to
select the unified hierarchy with a separate filesystem type "cgroup2"
so that unified hierarchy can be mounted as follows.

  mount -t cgroup2 none $MOUNT_POINT

The cgroup2 fs has its own magic number - 0x63677270 ("cgrp").

v2: Assign a different magic number to cgroup2 fs.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
This commit is contained in:
Tejun Heo
2015-11-16 11:13:34 -05:00
parent 34c06254ff
commit 67e9c74b8a
4 changed files with 26 additions and 29 deletions
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Documentation/cgroups/unified-hierarchy.txt
+2 -4
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@@ -94,11 +94,9 @@ the process.
2-1. Mounting
Currently, unified hierarchy can be mounted with the following mount
command. Note that this is still under development and scheduled to
change soon.
Unified hierarchy can be mounted with the following mount command.
mount -t cgroup -o __DEVEL__sane_behavior cgroup $MOUNT_POINT
mount -t cgroup2 none $MOUNT_POINT
All controllers which support the unified hierarchy and are not bound
to other hierarchies are automatically bound to unified hierarchy and