pidns: make killed children autoreap

Force SIGCHLD handling to SIG_IGN so that signals are not generated and so
that the children autoreap.  This increases the parallelize and in general
the speed of network namespace shutdown.

Note self reaping childrean can exist past zap_pid_ns_processess but they
will all be reaped before we allow the pid namespace init task with pid ==
1 to be reaped.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Louis Rilling <louis.rilling@kerlabs.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 57bc1fd35b3cbe6bffdbfe71af5f13fc00648b81..fd3c44986191ed36762e6256805eb55240d74490 100644 (file)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -149,7 +149,12 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
 {
        int nr;
        int rc;
-       struct task_struct *task;
+       struct task_struct *task, *me = current;
+
+       /* Ignore SIGCHLD causing any terminated children to autoreap */
+       spin_lock_irq(&me->sighand->siglock);
+       me->sighand->action[SIGCHLD - 1].sa.sa_handler = SIG_IGN;
+       spin_unlock_irq(&me->sighand->siglock);
 
        /*
         * The last thread in the cgroup-init thread group is terminating.