[PATCH] cgroup: Update remount documentation

* [PATCH] cgroup: Update remount documentation
@ 2012-07-10  8:49 Daniel Wagner
       [not found] ` <1341910158-8994-1-git-send-email-wagi-kQCPcA+X3s7YtjvyW6yDsg@public.gmane.org>
  0 siblings, 1 reply; 2+ messages in thread
From: Daniel Wagner @ 2012-07-10  8:49 UTC (permalink / raw)
  To: cgroups-u79uwXL29TY76Z2rM5mHXA
  Cc: Daniel Wagner, Rob Landley, Tejun Heo, Paul Menage, Li Zefan,
	Frederic Weisbecker, KAMEZAWA Hiroyuki

From: Daniel Wagner <daniel.wagner-98C5kh4wR6ohFhg+JK9F0w@public.gmane.org>

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

Signed-off-by: Daniel Wagner <daniel.wagner-98C5kh4wR6ohFhg+JK9F0w@public.gmane.org>
Cc: Rob Landley <rob-VoJi6FS/r0vR7s880joybQ@public.gmane.org>
Cc: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Paul Menage <paul-inf54ven1CmVyaH7bEyXVA@public.gmane.org>
Cc: Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
Cc: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
---
Hi,

while I am at it, the remount stuff should propapbly be removed
from the docucmetation as well.

cheers,
daniel


 Documentation/cgroups/cgroups.txt | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
index ed2ba6c..d12f2d0 100644
--- a/Documentation/cgroups/cgroups.txt
+++ b/Documentation/cgroups/cgroups.txt
@@ -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" \
-- 
1.7.11.1.104.ge7b44f1

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