From 858d72ead4864da0fb0b89b919524125ce998e27 Mon Sep 17 00:00:00 2001 From: "Serge E. Hallyn" Date: Thu, 18 Oct 2007 23:39:45 -0700 Subject: 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_" 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_/node_ 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_ will be empty and can be rmdir'ed to make the subsequent unshare() succeed. Changelog: Name cloned cgroups as "node_". [clg@fr.ibm.com: fix order of cgroup subsystems in init/Kconfig] Signed-off-by: Serge E. Hallyn Cc: Paul Menage Signed-off-by: Cedric Le Goater Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- init/Kconfig | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) (limited to 'init') diff --git a/init/Kconfig b/init/Kconfig index 6687f805b38..0007d1b5e86 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -288,6 +288,22 @@ config CGROUP_DEBUG Say N if unsure +config CGROUP_NS + bool "Namespace cgroup subsystem" + depends on CGROUPS + help + Provides a simple namespace cgroup subsystem to + provide hierarchical naming of sets of namespaces, + for instance virtual servers and checkpoint/restart + jobs. + +config CGROUP_CPUACCT + bool "Simple CPU accounting cgroup subsystem" + depends on CGROUPS + help + Provides a simple Resource Controller for monitoring the + total CPU consumed by the tasks in a cgroup + config CPUSETS bool "Cpuset support" depends on SMP && CGROUPS @@ -345,13 +361,6 @@ config PROC_PID_CPUSET depends on CPUSETS default y -config CGROUP_CPUACCT - bool "Simple CPU accounting cgroup subsystem" - depends on CGROUPS - help - Provides a simple Resource Controller for monitoring the - total CPU consumed by the tasks in a cgroup - config RELAY bool "Kernel->user space relay support (formerly relayfs)" help -- cgit v1.2.3