sukadev@xxxxxxxxxx wrote:
Pavel Emelianov [xemul@xxxxxxxxxx] wrote:
| When clone() is invoked with CLONE_NEWPID, create a new pid namespace
| and then create a new struct pid for the new process. Allocate pid_t's
| for the new process in the new pid namespace and all ancestor pid
| namespaces. Make the newly cloned process the session and process group
| leader.
|
| Since the active pid namespace is special and expected to be the first
active pid ns is the *last entry* in this patchset (not first) right ?
yes. thanks.
| entry in pid->upid_list, preserve the order of pid namespaces.
|
| The size of 'struct pid' is dependent on the the number of pid namespaces
| the process exists in, so we use multiple pid-caches'. Only one pid cache
| is created during system startup and this used by processes that exist
| only in init_pid_ns.
|
| When a process clones its pid namespace, we create additional pid caches
| as necessary and use the pid cache to allocate 'struct pids' for that depth.
|
| Note, that with this patch the newly created namespace won't work, since
| the rest of the kernel still uses global pids, but this is to be fixed
| soon. Init pid namespace still works.
|
| Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
| Signed-off-by: Sukadev Bhattiprolu <sukadev@xxxxxxxxxx>
|
| ---
|
| include/linux/sched.h | 1
| kernel/fork.c | 48 +++++++++++++++++---------
| kernel/nsproxy.c | 3 +
| kernel/pid.c | 91 +++++++++++++++++++++++++++++++++++++++++++++-----
| 4 files changed, 118 insertions(+), 25 deletions(-)
|
| --- ./include/linux/sched.h.ve14 2007-08-06 15:00:09.000000000 +0400
| +++ ./include/linux/sched.h 2007-08-06 15:00:09.000000000 +0400
| @@ -27,6 +27,7 @@
| #define CLONE_NEWUTS 0x04000000 /* New utsname group? */
| #define CLONE_NEWIPC 0x08000000 /* New ipcs */
| #define CLONE_NEWUSER 0x10000000 /* New user namespace */
| +#define CLONE_NEWPID 0x20000000 /* New pids */
Nit. I think "New pid namespace" would be a better comment.
ok.
Suka
Thanks,
Pavel
_______________________________________________
Containers mailing list
Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/containers
