perf_counter: Add fork event

Create a fork event so that we can easily clone the comm and
dso maps without having to generate all those events.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

kernel/fork.c

@@ -1412,12 +1412,12 @@ long do_fork(unsigned long clone_flags,
 		if (clone_flags & CLONE_VFORK) {
 			p->vfork_done = &vfork;
 			init_completion(&vfork);
-		} else {
+		} else if (!(clone_flags & CLONE_VM)) {
 			/*
 			 * vfork will do an exec which will call
 			 * set_task_comm()
 			 */
-			perf_counter_comm(p);
+			perf_counter_fork(p);
 		}
 
 		audit_finish_fork(p);