The patch titled cgroups: more documentation for remount and release_agent has been removed from the -mm tree. Its filename was cgroups-more-documentation-for-remount-and-release_agent.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ 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 origin.patch linux-next.patch cls_cgroup-remove-unneeded-cgroup_lock.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html