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| author | Serge E. Hallyn <serue@us.ibm.com> | 2007-10-18 23:39:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-19 11:53:37 -0700 |
| commit | 858d72ead4864da0fb0b89b919524125ce998e27 (patch) | |
| tree | 19ea321ca3b505efecb2053a829daf89a6a22529 /init | |
| parent | 846c7bb055747989891f5cd2bb6e8d56243ba1e7 (diff) | |
| download | linux-858d72ead4864da0fb0b89b919524125ce998e27.tar.gz linux-858d72ead4864da0fb0b89b919524125ce998e27.tar.bz2 linux-858d72ead4864da0fb0b89b919524125ce998e27.zip | |
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 'init')
| -rw-r--r-- | init/Kconfig | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/init/Kconfig b/init/Kconfig index 6687f805b38d..0007d1b5e867 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 |