From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
The event_limit can be set by the PERF_EVENT_IOC_REFRESH to limit the
number of events. When the event_limit reaches 0, the POLL_HUP signal
should be sent. But it's missed.
The corresponding counter should be stopped when the event_limit reaches
0. It was implemented in the ARCH-specific code. However, since the
commit 9734e25fbf5a ("perf: Fix the throttle logic for a group"), all
the ARCH-specific code has been moved to the generic code. The code to
handle the event_limit was lost.
Add the event->pmu->stop(event, 0); back.
Fixes: 9734e25fbf5a ("perf: Fix the throttle logic for a group")
Closes: https://lore.kernel.org/lkml/aICYAqM5EQUlTqtX@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
Reported-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
Tested-by: Sumanth Korikkar <sumanthk@xxxxxxxxxxxxx>
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
kernel/events/core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index dd8cf3c7fb7a..ec19c456b66d 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10378,6 +10378,7 @@ static int __perf_event_overflow(struct perf_event *event,
ret = 1;
event->pending_kill = POLL_HUP;
perf_event_disable_inatomic(event);
+ event->pmu->stop(event, 0);
}
if (event->attr.sigtrap) {
--
2.38.1
