[PATCH v2 2/3] tracing/kprobes: Make setup_boot_kprobe_events() asynchronous
From: Yaxiong Tian <hidden>
Date: 2026-01-26 02:43:39
Also in:
linux-block, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
During kernel boot, the setup_boot_kprobe_events() function causes significant delays, increasing overall startup time. The root cause is a lock contention chain: its child function enable_boot_kprobe_events() requires the event_mutex, which is already held by early_event_add_tracer(). early_event_add_tracer() itself is blocked waiting for the trace_event_sem read-write lock, which is held for an extended period by trace_event_update_all(). To resolve this, we have moved the execution of setup_boot_kprobe_events() to the trace_init_wq workqueue, allowing it to run asynchronously. Signed-off-by: Yaxiong Tian <redacted> --- kernel/trace/trace_kprobe.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 9953506370a5..4c6621f02696 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c@@ -2031,6 +2031,13 @@ static __init int init_kprobe_trace_early(void) } core_initcall(init_kprobe_trace_early); +static struct work_struct kprobe_trace_work __initdata; + +static void __init kprobe_trace_works_func(struct work_struct *work) +{ + setup_boot_kprobe_events(); +} + /* Make a tracefs interface for controlling probe points */ static __init int init_kprobe_trace(void) {
@@ -2048,7 +2055,12 @@ static __init int init_kprobe_trace(void) trace_create_file("kprobe_profile", TRACE_MODE_READ, NULL, NULL, &kprobe_profile_ops); - setup_boot_kprobe_events(); + if (trace_init_wq) { + INIT_WORK(&kprobe_trace_work, kprobe_trace_works_func); + queue_work(trace_init_wq, &kprobe_trace_work); + } else { + setup_boot_kprobe_events(); + } return 0; }
--
2.25.1