perf: Fix SIGIO handling

Vince noticed that unless we mmap() a buffer, SIGIO gets lost. So explicitly push the wakeup (including signals) when requested. Reported-by: Vince Weaver <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
mgowda · May 28, 2011 · f506b3d · f506b3d
1 parent e4a338d
commit f506b3d
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/kernel/events/core.c b/kernel/events/core.c
@@ -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;
 }