perf_counter: Add a comm hook for pure fork()s

I noticed missing COMM events and found that we missed
reporting them for pure forks.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 23bf757ed321..b7d7a9f0bd7a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1412,6 +1412,12 @@ long do_fork(unsigned long clone_flags,
                 if (clone_flags & CLONE_VFORK) {
                         p->vfork_done = &vfork;
                         init_completion(&vfork);
+                } else {
+                        /*
+                         * vfork will do an exec which will call
+                         * set_task_comm()
+                         */
+                        perf_counter_comm(p);
                 }
 
                 audit_finish_fork(p);