Messages in this thread | | | Date | Tue, 24 Feb 2009 13:39:58 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | Re: [PATCH] cgroups: more documentation for remount and release_agent |
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On Tue, 24 Feb 2009 10:33:53 +0800 Li Zefan <lizf@cn.fujitsu.com> wrote:
> 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@cn.fujitsu.com>
Seems nice! Thank you. Reviewd-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> --- > Documentation/cgroups/cgroups.txt | 20 ++++++++++++++++++-- > 1 files changed, 18 insertions(+), 2 deletions(-) > > diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt > index 93feb84..df295c6 100644 > --- a/Documentation/cgroups/cgroups.txt > +++ b/Documentation/cgroups/cgroups.txt > @@ -333,12 +333,23 @@ The "xxx" is not interpreted by the cgroup code, but will appear in > > 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 tree that corresponds to the > 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 > -- > 1.5.4.rc3 > >
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