summaryrefslogtreecommitdiffstats
path: root/include/linux/cgroup_subsys.h
diff options
context:
space:
mode:
authorSerge E. Hallyn <serue@us.ibm.com>2007-10-18 23:39:45 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:37 -0700
commit858d72ead4864da0fb0b89b919524125ce998e27 (patch)
tree19ea321ca3b505efecb2053a829daf89a6a22529 /include/linux/cgroup_subsys.h
parent846c7bb055747989891f5cd2bb6e8d56243ba1e7 (diff)
cgroups: implement namespace tracking subsystem
When a task enters a new namespace via a clone() or unshare(), a new cgroup is created and the task moves into it. This version names cgroups which are automatically created using cgroup_clone() as "node_<pid>" where pid is the pid of the unsharing or cloned process. (Thanks Pavel for the idea) This is safe because if the process unshares again, it will create /cgroups/(...)/node_<pid>/node_<pid> The only possibilities (AFAICT) for a -EEXIST on unshare are 1. pid wraparound 2. a process fails an unshare, then tries again. Case 1 is unlikely enough that I ignore it (at least for now). In case 2, the node_<pid> will be empty and can be rmdir'ed to make the subsequent unshare() succeed. Changelog: Name cloned cgroups as "node_<pid>". [clg@fr.ibm.com: fix order of cgroup subsystems in init/Kconfig] Signed-off-by: Serge E. Hallyn <serue@us.ibm.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/cgroup_subsys.h')
-rw-r--r--include/linux/cgroup_subsys.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index cbadc3b5dbc..651ff0869b2 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -24,3 +24,9 @@ SUBSYS(debug)
#endif
/* */
+
+#ifdef CONFIG_CGROUP_NS
+SUBSYS(ns)
+#endif
+
+/* */