[PATCH] tracing: kprobe-event: Return directly when trace kprobes is empty
From: <hidden>
Date: 2026-01-27 02:02:19
Also in:
lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
From: sunliming <redacted> In enable_boot_kprobe_events(), it returns directly when trace kprobes 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 trace kprobes is empty. Signed-off-by: sunliming <redacted> --- kernel/trace/trace_kprobe.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 9953506370a5..95f2c42603d5 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c@@ -82,6 +82,7 @@ static struct trace_kprobe *to_trace_kprobe(struct dyn_event *ev) #define for_each_trace_kprobe(pos, dpos) \ for_each_dyn_event(dpos) \ if (is_trace_kprobe(dpos) && (pos = to_trace_kprobe(dpos))) +#define trace_kprobe_list_empty() list_empty(&dyn_event_list) static nokprobe_inline bool trace_kprobe_is_return(struct trace_kprobe *tk) {
@@ -1982,6 +1983,9 @@ static __init void enable_boot_kprobe_events(void) struct trace_kprobe *tk; struct dyn_event *pos; + if (trace_kprobe_list_empty()) + return; + guard(mutex)(&event_mutex); for_each_trace_kprobe(tk, pos) { list_for_each_entry(file, &tr->events, list)
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2.25.1