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| author | Eric B Munson <emunson@mgebm.net> | 2011-03-16 02:12:18 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-03-16 20:47:04 +0300 |
| commit | bb6405eab2a408c46949b3353ecfa1126caa3af2 (patch) | |
| tree | a3055d57891536fe0559be02b356cbc527524ddf /Documentation | |
| parent | ca3b78aa1672162f93de90cbf5051edea298a290 (diff) | |
| download | linux-bb6405eab2a408c46949b3353ecfa1126caa3af2.tar.xz | |
Documentation: update cgroup pid and cpuset information
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@mgebm.net>
Acked-by: Paul Menage <menage@google.com>
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/cgroups/cgroups.txt | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index 44b8b7af8019..cbdfb7d9455b 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -349,6 +349,10 @@ To mount a cgroup hierarchy with all available subsystems, type: 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 echoing 0: # 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 -------------------------------- |