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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-05-26 17:02:53 +0200
committerIngo Molnar <mingo@elte.hu>2011-05-28 17:04:59 +0200
commitf506b3dc0ec454a16d40cab9ee5d75435b39dc50 (patch)
treefc0dfaab17f42445e04abf51817016647a9c6b56
parentperf top: Don't stop if no kernel symtab is found (diff)
downloadlinux-f506b3dc0ec454a16d40cab9ee5d75435b39dc50.tar.xz
linux-f506b3dc0ec454a16d40cab9ee5d75435b39dc50.zip
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 <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>
-rw-r--r--kernel/events/core.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index c09767f7db3e..d863b3c057bb 100644
--- 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;
}