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Message-Id: <20110315161218.817cd662.rdunlap@xenotime.net> Date: Tue, 15 Mar 2011 16:12:18 -0700 From: Randy Dunlap <rdunlap@...otime.net> To: lkml <linux-kernel@...r.kernel.org> Cc: torvalds <torvalds@...ux-foundation.org>, Eric B Munson <emunson@...bm.net>, Paul Menage <menage@...gle.com> Subject: [PATCH 5/6] Documentation: update cgroup pid and cpuset information From: Eric B Munson <emunson@...bm.net> The cgroup documentation does not specify how a process can be removed from a particular group. This patch adds a note at the end of the simple example about how this is done. Also, some cgroups (like cpusets) require user input before a new group can be used. This is noted in the patch as well. Signed-off-by: Eric B Munson <emunson@...bm.net> Acked-by: Paul Menage <menage@...gle.com> Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com> --- Changes from V1: Rework the note about removing a process from a cgroup Add note about ns cgroup causing failure when moving processes between groups Documentation/cgroups/cgroups.txt | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- lnx-2638-rc8.orig/Documentation/cgroups/cgroups.txt +++ lnx-2638-rc8/Documentation/cgroups/cgroups.txt @@ -349,6 +349,10 @@ To mount a cgroup hierarchy with all ava The "xxx" is not interpreted by the cgroup code, but will appear in /proc/mounts so may be any useful identifying string that you like. +Note: Some subsystems do not work without some user input first. For instance, +if cpusets are enabled the user will have to populate the cpus and mems files +for each new cgroup created before that group can be used. + To mount a cgroup hierarchy with just the cpuset and memory subsystems, type: # mount -t cgroup -o cpuset,memory hier1 /dev/cgroup @@ -426,6 +430,14 @@ You can attach the current shell task by # echo 0 > tasks +Note: Since every task is always a member of exactly one cgroup in each +mounted hierarchy, to remove a task from its current cgroup you must +move it into a new cgroup (possibly the root cgroup) by writing to the +new cgroup's tasks file. + +Note: If the ns cgroup is active, moving a process to another cgroup can +fail. + 2.3 Mounting hierarchies by name -------------------------------- -- 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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