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cgroups: implement namespace tracking subsystem

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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>".

[[email protected]: fix order of cgroup subsystems in init/Kconfig]
Signed-off-by: Serge E. Hallyn <[email protected]>
Cc: Paul Menage <[email protected]>
Signed-off-by: Cedric Le Goater <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Serge E. Hallyn 2007-10-18 23:39:45 -07:00 • committed by Linus Torvalds
commit 858d72ead4
6 changed files with 146 additions and 8 deletions
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23
init/Kconfig
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@ -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