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 ? | 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. Suka _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers