From nobody Tue Feb 10 13:37:29 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 6A85E20E03F; Wed, 28 Jan 2026 12:54:18 +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=1769604862; cv=none; b=k1gaGrbk428uL42Z89NEWw7L0/VqbrsZxyWMAVCN54c8QPtlsEg1zd8qVIBh7obsj2T7z82qY5blHx1pEnu2TI6yteUo/jwHh6juw/HWdc+MPlAUNfO/xtqMRdzYMmJSRoT6OMGYHoRdLDpw8Shsatn7dGKsx9ezVvxFmMarqSc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769604862; c=relaxed/simple; bh=gb8+RLwH1mLnHCvquqykDWLMdPea4d3L/yrMxNd7l2g=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=lqVBGV9NxbnSsYnP6nFs65BH06erfKWNV12JIknbVWMrjjOltTUHdxcsYMrn021DWigsKDeZsrW49PLnIkB5iXrY2wCqzD4H02Drnw1NciDRYzWWzlJ1li22k84RV5R3TBlZivY5vlkR3UyKUd1e9fzbN5hAD21I9EfRWaGlSCc= 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: 7209109cfc4811f0b0f03b4cfa9209d1-20260128 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:5946a7ab-2fca-46e7-b57f-f2ea221c3437,IP:10,U RL:0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:0 X-CID-INFO: VERSION:1.3.6,REQID:5946a7ab-2fca-46e7-b57f-f2ea221c3437,IP:10,URL :0,TC:0,Content:-5,EDM:0,RT:0,SF:-5,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:a9d874c,CLOUDID:c9a6ee56d66a87408c0ae6abc21a31ef,BulkI D:260128205414BPB3US2C,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: 7209109cfc4811f0b0f03b4cfa9209d1-20260128 X-User: tianyaxiong@kylinos.cn Received: from localhost.localdomain [(175.2.149.138)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 1948363014; Wed, 28 Jan 2026 20:54:12 +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 1/5] tracing: Rename `eval_map_wq` and allow other parts of tracing use it Date: Wed, 28 Jan 2026 20:53:57 +0800 Message-Id: <20260128125357.1711985-1-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 eval_map_work_func() function, though queued in eval_map_wq, holds the trace_event_sem read-write lock for a long time during kernel boot. This causes blocking issues for other functions. Rename eval_map_wq to trace_init_wq and make it global, thereby allowing other parts of tracing to schedule work on this queue asynchronously and avoiding blockage of the main boot thread. Suggested-by: Steven Rostedt Signed-off-by: Yaxiong Tian --- kernel/trace/trace.c | 18 +++++++++--------- kernel/trace/trace.h | 1 + 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index b1cb30a7b83d..01df88e77818 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -10774,7 +10774,7 @@ int tracing_init_dentry(void) extern struct trace_eval_map *__start_ftrace_eval_maps[]; extern struct trace_eval_map *__stop_ftrace_eval_maps[]; =20 -static struct workqueue_struct *eval_map_wq __initdata; +struct workqueue_struct *trace_init_wq __initdata; static struct work_struct eval_map_work __initdata; static struct work_struct tracerfs_init_work __initdata; =20 @@ -10790,15 +10790,15 @@ static int __init trace_eval_init(void) { INIT_WORK(&eval_map_work, eval_map_work_func); =20 - eval_map_wq =3D alloc_workqueue("eval_map_wq", WQ_UNBOUND, 0); - if (!eval_map_wq) { - pr_err("Unable to allocate eval_map_wq\n"); + trace_init_wq =3D alloc_workqueue("trace_init_wq", WQ_UNBOUND, 0); + if (!trace_init_wq) { + pr_err("Unable to allocate trace_init_wq\n"); /* Do work here */ eval_map_work_func(&eval_map_work); return -ENOMEM; } =20 - queue_work(eval_map_wq, &eval_map_work); + queue_work(trace_init_wq, &eval_map_work); return 0; } =20 @@ -10807,8 +10807,8 @@ subsys_initcall(trace_eval_init); static int __init trace_eval_sync(void) { /* Make sure the eval map updates are finished */ - if (eval_map_wq) - destroy_workqueue(eval_map_wq); + if (trace_init_wq) + destroy_workqueue(trace_init_wq); return 0; } =20 @@ -10969,9 +10969,9 @@ static __init int tracer_init_tracefs(void) if (ret) return 0; =20 - if (eval_map_wq) { + if (trace_init_wq) { INIT_WORK(&tracerfs_init_work, tracer_init_tracefs_work_func); - queue_work(eval_map_wq, &tracerfs_init_work); + queue_work(trace_init_wq, &tracerfs_init_work); } else { tracer_init_tracefs_work_func(NULL); } diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index de4e6713b84e..9e8d52503618 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -769,6 +769,7 @@ extern cpumask_var_t __read_mostly tracing_buffer_mask; extern unsigned long nsecs_to_usecs(unsigned long nsecs); =20 extern unsigned long tracing_thresh; +extern struct workqueue_struct *trace_init_wq __initdata; =20 /* PID filtering */ =20 --=20 2.25.1