From nobody Wed Feb 11 05:40:59 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5D2321F7541 for ; Mon, 9 Feb 2026 02:20:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770603606; cv=none; b=JSdxHisoK17yYh+WDjboFo7ow+hUS3M0snjeLSDRcvAB8Ch25YEPEswaI0ff7/j6Wb+OVxt9tUdQQppKvJ0DHN66jhr3wggBu5+TNlZB6pY7tsKAw1D8r+LyT5Q7n6JQ172zJpFqIOAnM3r3SH1kynomNxsr87MM7+ICjUcUm3Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770603606; c=relaxed/simple; bh=8ecH07bGMwHC4uD+yk/3x8YQ1DXfG2vjCSTS00AqnUQ=; h=Message-ID:Date:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=e/fhFgsbXlRPUcoMPZdjn0td8bEBhDg1GI8tLhfeMWu+QOUnHT/T4XEN9maOu0RXXlggYOEI6408PP13ThqNjd9PVOdGJqfZ7Lpt/TGA90GYEPpPl9bk4YczQ3RU60Bfa5NI9/FG35ZhXwdaRMys72aVuGSJoB+tyxbVdO1pKvU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AgUWTPRd; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AgUWTPRd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B89BC2BC87; Mon, 9 Feb 2026 02:20:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770603606; bh=8ecH07bGMwHC4uD+yk/3x8YQ1DXfG2vjCSTS00AqnUQ=; h=Date:From:To:Cc:Subject:References:From; b=AgUWTPRdGZTyTPDoeNr8qeFJTTf8Xd8or/kegeZBFktjYKo4EbYu9QMjJeaHdUPU2 n/LtC+Rxv2SnRc9ztyZ7L4XiXu0vT2AcRWMvrphRKXl7ee2EgaOI3qakW/7tbxLd9u 0W4SSpLdCma6LKCMSu9NXmJvBnoCiGq/6yFE9N5v/Zu3gB7YV1yqQGwtKXQikPo+TH pWIKG44Fsf0SvKGNxu4fLBq2nRVWJXrK0ESLZJxyCBqY8QXLFgpiAL/z08+7003KTN aPyytymRiw97qnIBib5nqrT51kKndXPn/H+aPWr8Ie3lGpbaXMxg9uH9IJoLSycCyE i0TTIB5VaYmpQ== Received: from rostedt by gandalf with local (Exim 4.99.1) (envelope-from ) id 1vpGtQ-0000000Aa1P-2rZD; Sun, 08 Feb 2026 21:20:52 -0500 Message-ID: <20260209022052.531796944@kernel.org> User-Agent: quilt/0.68 Date: Sun, 08 Feb 2026 21:20:29 -0500 From: Steven Rostedt To: linux-kernel@vger.kernel.org Cc: Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Yaxiong Tian Subject: [for-next][PATCH 03/20] blktrace: Make init_blk_tracer() asynchronous References: <20260209022026.627895421@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Yaxiong Tian 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 resolve this, the execution of primary init_blk_tracer() is moved to the trace_init_wq workqueue, allowing it to run asynchronously, and prevent blocking the main boot thread. Link: https://patch.msgid.link/20260204015353.163331-1-tianyaxiong@kylinos.= cn Acked-by: Masami Hiramatsu (Google) Signed-off-by: Yaxiong Tian Signed-off-by: Steven Rostedt (Google) --- 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..d611cd1f02ef 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -1832,7 +1832,9 @@ static struct trace_event trace_blk_event =3D { .funcs =3D &trace_blk_event_funcs, }; =20 -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; } =20 +static void __init blktrace_works_func(struct work_struct *work) +{ + __init_blk_tracer(); +} + +static int __init init_blk_tracer(void) +{ + int ret =3D 0; + + if (trace_init_wq) { + INIT_WORK(&blktrace_works, blktrace_works_func); + queue_work(trace_init_wq, &blktrace_works); + } else { + ret =3D __init_blk_tracer(); + } + + return ret; +} + device_initcall(init_blk_tracer); =20 static int blk_trace_remove_queue(struct request_queue *q) --=20 2.51.0