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cgroup: Update remount documentation

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Remounting support will be removed in the future (see
feature-removal-schedule.txt).  Discourage users from using it.

Signed-off-by: Daniel Wagner <[email protected]>
Signed-off-by: Tejun Heo <[email protected]>
Cc: Rob Landley <[email protected]>
Cc: Paul Menage <[email protected]>
Cc: Li Zefan <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
This commit is contained in:
Daniel Wagner 2012-07-10 10:49:18 +02:00 • committed by Tejun Heo
commit 9a8054aa5d
1 changed files with 6 additions and 9 deletions
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15
Documentation/cgroups/cgroups.txt
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@ -370,15 +370,12 @@ To mount a cgroup hierarchy with just the cpuset and memory
subsystems, type:
# mount -t cgroup -o cpuset,memory hier1 /sys/fs/cgroup/rg1
To change the set of subsystems bound to a mounted hierarchy, just
remount with different options:
# mount -o remount,cpuset,blkio hier1 /sys/fs/cgroup/rg1
Now memory is removed from the hierarchy and blkio is added.
Note this will add blkio to the hierarchy but won't remove memory or
cpuset, because the new options are appended to the old ones:
# mount -o remount,blkio /sys/fs/cgroup/rg1
While remounting cgroups is currently supported, it is not recommend
to use it. Remounting allows changing bound subsystems and
release_agent. Rebinding is hardly useful as it only works when the
hierarchy is empty and release_agent itself should be replaced with
conventional fsnotify. The support for remounting will be removed in
the future.
To Specify a hierarchy's release_agent:
# mount -t cgroup -o cpuset,release_agent="/sbin/cpuset_release_agent" \