linux-kernel - [PATCH 3/3] blktrace: Make init_blk

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Message-Id: <20260122032437.396641-1-tianyaxiong@kylinos.cn>
Date: Thu, 22 Jan 2026 11:24:37 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: axboe@...nel.dk,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [PATCH 3/3] blktrace: Make init_blk_tracer() asynchronous

The init_blk_tracer() function causes significant boot delay as it
waits for the trace_event_sem lock held by trace_event_update_all().
Specifically, its child function register_trace_event() requires
this lock, which is occupied for an extended period during boot.

To mitigate this contention, we have moved init_blk_tracer() to the
eval_map_wq workqueue, allowing it to execute asynchronously and
prevent blocking the main boot thread.

Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
---
 kernel/trace/blktrace.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index d031c8d80be4..dc205873c3b8 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -1832,7 +1832,9 @@ static struct trace_event trace_blk_event = {
 	.funcs		= &trace_blk_event_funcs,
 };
 
-static int __init init_blk_tracer(void)
+static struct work_struct blktrace_works __initdata;
+
+static int __init __init_blk_tracer(void)
 {
 	if (!register_trace_event(&trace_blk_event)) {
 		pr_warn("Warning: could not register block events\n");
@@ -1852,6 +1854,25 @@ static int __init init_blk_tracer(void)
 	return 0;
 }
 
+static void __init blktrace_works_func(struct work_struct *work)
+{
+	__init_blk_tracer();
+}
+
+static int __init init_blk_tracer(void)
+{
+	int ret = 0;
+
+	if (eval_map_wq) {
+		INIT_WORK(&blktrace_works, blktrace_works_func);
+		queue_work(eval_map_wq, &blktrace_works);
+	} else {
+		ret = __init_blk_tracer();
+	}
+
+	return ret;
+}
+
 device_initcall(init_blk_tracer);
 
 static int blk_trace_remove_queue(struct request_queue *q)
-- 
2.25.1