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Date: Mon, 23 Feb 2009 10:56:04 +0800 From: Li Zefan <lizf@...fujitsu.com> To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, menage@...gle.com, containers@...ts.linux-foundation.org Subject: Re: Question for remount Li Zefan wrote: >> 1. Documentation/cgroups/cgroup.txt says >> #mount -oremount,cpuset,ns /dev/cgroup >> But this should be >> #mount -tcgroup none /dev/cgroup -oremount,cpuset,ns >> > > I agree. Actually I noticed this long ago. > > Doing this won't remove cpuacct from the cgroup hierarchy: > # mount -t cgroup -o cpu,cpuacct xxx /mnt > # mount -o remount,cpu /mnt > This will get you right: > # mount [-t cgroup] -o remount,cpu xxx /mnt > How about this patch: [PATCH] cgroups: fix documentation about remount 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 current options. And this will get you right: # mount [-t cgroup] -o remount,cpu xxx /mnt Signed-off-by: Li Zefan <lizf@...fujitsu.com> --- Documentation/cgroups/cgroups.txt | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 93feb84..5cbeab2 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -337,8 +337,13 @@ subsystems, type: 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 numtasks is removed from the hierarchy and ns is added. + +Note this will add ns to the hierarchy but won't remove numtasks or +cpuset: +# mount -o remount,ns /dev/cgroup Note that changing the set of subsystems is currently only supported when the hierarchy consists of a single (root) cgroup. Supporting -- 1.5.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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