perf: Fix SIGIO handling
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Thu, 26 May 2011 15:02:53 +0000 (17:02 +0200)
committerIngo Molnar <mingo@elte.hu>
Sat, 28 May 2011 15:04:59 +0000 (17:04 +0200)
Vince noticed that unless we mmap() a buffer, SIGIO gets lost. So
explicitly push the wakeup (including signals) when requested.

Reported-by: Vince Weaver <vweaver1@eecs.utk.edu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/n/tip-2euus3f3x3dyvdk52cjxw8zu@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/events/core.c

index c09767f7db3e20e4a510c7a51fba7d662e967659..d863b3c057bba8fe4add3e774a3bb86083c493a5 100644 (file)
@@ -5028,6 +5028,14 @@ static int __perf_event_overflow(struct perf_event *event, int nmi,
        else
                perf_event_output(event, nmi, data, regs);
 
+       if (event->fasync && event->pending_kill) {
+               if (nmi) {
+                       event->pending_wakeup = 1;
+                       irq_work_queue(&event->pending);
+               } else
+                       perf_event_wakeup(event);
+       }
+
        return ret;
 }