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Task Control Groups: add cgroup_clone() interface

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Add support for cgroup_clone(), a way to create new cgroups intended to
be used for systems such as namespace unsharing.  A new subsystem callback,
post_clone(), is added to allow subsystems to automatically configure cloned
cgroups.

Signed-off-by: Paul Menage <menage@google.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Srivatsa Vaddagiri <vatsa@in.ibm.com>
Cc: 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>
This commit is contained in:
Paul Menage 2007-10-18 23:39:34 -07:00 • committed by Linus Torvalds
parent b4f48b6363
commit 697f416108
3 changed files with 145 additions and 0 deletions
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3
include/linux/cgroup.h
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@ -182,6 +182,7 @@ struct cgroup_subsys {
void (*exit)(struct cgroup_subsys *ss, struct task_struct *task);
int (*populate)(struct cgroup_subsys *ss,
struct cgroup *cont);
void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cont);
void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
int subsys_id;
int active;
@ -221,6 +222,8 @@ static inline struct cgroup* task_cgroup(struct task_struct *task,
int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss);
#else /* !CONFIG_CGROUPS */
static inline int cgroup_init_early(void) { return 0; }