The patch titled
cgroups: more documentation for remount and release_agent
has been added to the -mm tree. Its filename is
cgroups-more-documentation-for-remount-and-release_agent.patch
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------------------------------------------------------
Subject: cgroups: more documentation for remount and release_agent
From: Li Zefan <lizf@xxxxxxxxxxxxxx>
This won't remove cpuacct from the mounted hierachy:
# mount -t cgroup -o cpu,cpuacct xxx /mnt
# mount -o remount,cpu /mnt
Because for this usage mount(8) will append the new options to the original
options.
And this will get you right:
# mount [-t cgroup] -o remount,cpu xxx /mnt
Also document how to specify or change release_agent.
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
Reviewd-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/cgroups/cgroups.txt | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff -puN Documentation/cgroups/cgroups.txt~cgroups-more-documentation-for-remount-and-release_agent Documentation/cgroups/cgroups.txt
--- a/Documentation/cgroups/cgroups.txt~cgroups-more-documentation-for-remount-and-release_agent
+++ a/Documentation/cgroups/cgroups.txt
@@ -333,12 +333,23 @@ The "xxx" is not interpreted by the cgro
To mount a cgroup hierarchy with just the cpuset and numtasks
subsystems, type:
-# mount -t cgroup -o cpuset,numtasks hier1 /dev/cgroup
+# mount -t cgroup -o cpuset,memory hier1 /dev/cgroup
To change the set of subsystems bound to a mounted hierarchy, just
remount with different options:
+# mount -o remount,cpuset,ns hier1 /dev/cgroup
-# mount -o remount,cpuset,ns /dev/cgroup
+Now memory is removed from the hierarchy and ns is added.
+
+Note this will add ns to the hierarchy but won't remove memory or
+cpuset, because the new options are appended to the old ones:
+# mount -o remount,ns /dev/cgroup
+
+To Specify a hierarchy's release_agent:
+# mount -t cgroup -o cpuset,release_agent="/sbin/cpuset_release_agent" \
+ xxx /dev/cgroup
+
+Note that specifying 'release_agent' more than once will return failure.
Note that changing the set of subsystems is currently only supported
when the hierarchy consists of a single (root) cgroup. Supporting
@@ -349,6 +360,11 @@ Then under /dev/cgroup you can find a tr
tree of the cgroups in the system. For instance, /dev/cgroup
is the cgroup that holds the whole system.
+If you want to change the value of release_agent:
+# echo "/sbin/new_release_agent" > /dev/cgroup/release_agent
+
+It can also be changed via remount.
+
If you want to create a new cgroup under /dev/cgroup:
# cd /dev/cgroup
# mkdir my_cgroup
_
Patches currently in -mm which might be from lizf@xxxxxxxxxxxxxx are
linux-next.patch
vfs-add-missing-unlock-in-sget.patch
relax-ns_can_attach-checks-to-allow-attaching-to-grandchild-cgroups.patch
cgroup-css-id-support.patch
cgroup-fix-frequent-ebusy-at-rmdir.patch
cgroups-more-documentation-for-remount-and-release_agent.patch
memcg-use-css-id.patch
memcg-hierarchical-stat.patch
memcg-fix-shrinking-memory-to-return-ebusy-by-fixing-retry-algorithm.patch
memcg-fix-oom-killer-under-memcg.patch
memcg-fix-oom-killer-under-memcg-fix2.patch
memcg-fix-oom-killer-under-memcg-fix.patch
memcg-show-memcg-information-during-oom.patch
memcg-show-memcg-information-during-oom-fix2.patch
memcg-show-memcg-information-during-oom-fix.patch
memcg-show-memcg-information-during-oom-fix-fix.patch
memcg-show-memcg-information-during-oom-fix-fix-checkpatch-fixes.patch
cpuset-fix-possible-races-in-cpu-memory-hotplug.patch
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