From: sunliming <[email protected]> In enable_boot_kprobe_events(), it returns directly when dyn_event_list is empty, thereby reducing the function's execution time. This function may otherwise wait for the event_mutex lock for tens of milliseconds on certain machines, which is unnecessary when dyn_event_list is empty.
Signed-off-by: sunliming <[email protected]> --- kernel/trace/trace_kprobe.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 9953506370a5..d89a403c99d4 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1982,6 +1982,9 @@ static __init void enable_boot_kprobe_events(void) struct trace_kprobe *tk; struct dyn_event *pos; + if (list_empty(&dyn_event_list)) + return; + guard(mutex)(&event_mutex); for_each_trace_kprobe(tk, pos) { list_for_each_entry(file, &tr->events, list) -- 2.25.1
