From nobody Tue Feb 10 19:49:49 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 C4E1234FF59; Wed, 28 Jan 2026 12:56:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769604975; cv=none; b=fFSDbLa6lF61EaiK9o959gRv8uNJd7m42VhidtssBZ3bSVoRg5jm++kbkscvypEf6GlFF7cHi5+MXJpVJTrHQiR0XC5DpkkKMl64+BKqVG95junSJkv5o7unSG/jlsFk1wMTntn8fGTpwbN/3FROuRkezC1dzdCyuOJzmRz3mWU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769604975; c=relaxed/simple; bh=9IJ4CsI3azrt2akw/y/viNEErdy5VYNOL4a3Nwm3XmY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=tvXc8xtCjhSHy3xEir52ccNpt3yrSWAvbpxis3a1eOtH/gW9IzWt05tJJr44tHVt8+KmAVbd1X4jm4qSF7G+tnwNXbG+sVJQ5dPDckBOt43YtXEJRGdw+v56IGvmV/oUztiGyZrT+usTV/vMr/4rS+PvDD7ddcI//qUxIV+dx3k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: b64d3e4afc4811f0b0f03b4cfa9209d1-20260128 X-CTIC-Tags: HR_CC_COUNT, HR_CC_DOMAIN_COUNT, HR_CC_NAME, HR_CC_NO_NAME, HR_CTE_8B HR_CTT_MISS, HR_DATE_H, HR_DATE_WKD, HR_DATE_ZONE, HR_FROM_NAME HR_SJ_DIGIT_LEN, HR_SJ_LANG, HR_SJ_LEN, HR_SJ_LETTER, HR_SJ_NOR_SYM HR_SJ_PHRASE, HR_SJ_PHRASE_LEN, HR_SJ_WS, HR_TO_COUNT, HR_TO_DOMAIN_COUNT HR_TO_NO_NAME, IP_UNTRUSTED, SRC_UNTRUSTED, IP_UNFAMILIAR, SRC_UNFAMILIAR DN_TRUSTED, SRC_TRUSTED, SA_TRUSTED, SA_EXISTED, SN_TRUSTED SN_EXISTED, SPF_NOPASS, DKIM_NOPASS, DMARC_NOPASS, CIE_GOOD_SPF CIE_UNKNOWN, GTI_FG_BS, GTI_RG_INFO, GTI_C_BU, AMN_GOOD ABX_MISS_RDNS X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.6,REQID:92eb13ed-6a87-41e9-ad00-44c723de46b5,IP:10,U RL:0,TC:0,Content:-25,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:-20 X-CID-INFO: VERSION:1.3.6,REQID:92eb13ed-6a87-41e9-ad00-44c723de46b5,IP:10,URL :0,TC:0,Content:-25,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION :release,TS:-20 X-CID-META: VersionHash:a9d874c,CLOUDID:3c76fa077e3e311b2dc2ad8b2ae08010,BulkI D:2601282056087V6MGO1B,BulkQuantity:0,Recheck:0,SF:17|19|38|66|78|81|82|10 2|127|850|898,TC:nil,Content:0|15|50,EDM:-3,IP:-2,URL:0,File:nil,RT:nil,Bu lk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR: 0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_FAS,TF_CID_SPAM_FSD X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: b64d3e4afc4811f0b0f03b4cfa9209d1-20260128 X-User: tianyaxiong@kylinos.cn Received: from localhost.localdomain [(175.2.149.138)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1998762990; Wed, 28 Jan 2026 20:56:07 +0800 From: Yaxiong Tian To: mhiramat@kernel.org, rostedt@goodmis.org, axboe@kernel.dk, mathieu.desnoyers@efficios.com, corbet@lwn.net, skhan@linuxfoundation.org Cc: linux-trace-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, Yaxiong Tian Subject: [PATCH v4 5/5] blktrace: Make init_blk_tracer() asynchronous when trace_async_init set Date: Wed, 28 Jan 2026 20:55:54 +0800 Message-Id: <20260128125554.1717261-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260128125117.1704853-1-tianyaxiong@kylinos.cn> References: <20260128125117.1704853-1-tianyaxiong@kylinos.cn> 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" 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, when the trace_async_init parameter is enabled, 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. Signed-off-by: Yaxiong Tian Acked-by: Jens Axboe --- 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..56c7270ec447 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 && trace_async_init) { + 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 2.25.1