From nobody Mon Feb 9 05:13:38 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 C2C5523AE87; Tue, 27 Jan 2026 01:23:13 +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=1769476996; cv=none; b=TJYDPkXsGYFyIZCTjZss3vgeLF2AuzCKfrjNWjZ1LxOuNUfbRZ9F+9c8S/gO6CD3daAHDegX1MdozvQozDSBXQ0fmAie580IwLgmxxf/u4xforMm7qamjwv7oL43tE6rx83iE4Pbx0gj/NWMD3npbVdWKzwt/qAeBDjgK/KzLcw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769476996; c=relaxed/simple; bh=c26LWJOSqBn1uKS1Y9B9BBfhxHXeS6WDWMMV2m3rB18=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=L6eGoax2lKfGKhS6jtNJLmehru5Z14mC9DfHkpXEr8dutf1IEJSP8ab7ut0Ir5jRGiXCSNiy3+W5jNCPDGQ1qjRODb75J3GAoo0EiMS1iGOdoc3RlfRWZj+sNBbTNcGxHdQ1UGE+qQxxPwBjPJI5t71vXoC6Gk5mAnNITd/UYrw= 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: bc148bc4fb1e11f0b0f03b4cfa9209d1-20260127 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:aa351779-3fc6-44d4-b54e-291288915f4b,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:aa351779-3fc6-44d4-b54e-291288915f4b,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:0045e75a0578c7fb8869caa328d596fb,BulkI D:260127092308A80JDBPV,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: bc148bc4fb1e11f0b0f03b4cfa9209d1-20260127 X-User: tianyaxiong@kylinos.cn Received: from localhost.localdomain [(175.2.158.168)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA) with ESMTP id 620773331; Tue, 27 Jan 2026 09:23:07 +0800 From: Yaxiong Tian To: rostedt@goodmis.org, axboe@kernel.dk, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH v3 1/3] tracing: Rename `eval_map_wq` and allow other parts of tracing use it Date: Tue, 27 Jan 2026 09:23:03 +0800 Message-Id: <20260127012303.84230-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260127012016.76713-1-tianyaxiong@kylinos.cn> References: <20260127012016.76713-1-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. Signed-off-by: Yaxiong Tian --- kernel/trace/trace.c | 18 +++++++++--------- kernel/trace/trace.h | 2 ++ 2 files changed, 11 insertions(+), 9 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index e18005807395..c61e30cb7339 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..e52f259f8945 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -770,6 +770,8 @@ extern unsigned long nsecs_to_usecs(unsigned long nsecs= ); =20 extern unsigned long tracing_thresh; =20 +extern struct workqueue_struct *trace_init_wq __initdata; + /* PID filtering */ =20 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids, --=20 2.25.1 From nobody Mon Feb 9 05:13:38 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 7C07523AB90; Tue, 27 Jan 2026 01:23:23 +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=1769477005; cv=none; b=jEcy3tBHkNn1XTgPhrRQ8fuDCIaDiexMp0y/2mv9DJqZ5HpT5wx8DFQ1RSGsUUOKEEpunsL6YEW4NNudbqDhvYVJNxLFKfRZdvZOeoEehg3eVWHgbcdEoR281CHKMkbPNYLZ+M2wjA18qzMFJqIjejEwYmoo6WuW/NUQWaeEdV4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769477005; c=relaxed/simple; bh=muqgW4cP7AU5hnY7JwXPmkOy6cWTvzvNqJcLO2ROQN4=; 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Tue, 27 Jan 2026 09:23:15 +0800 From: Yaxiong Tian To: rostedt@goodmis.org, axboe@kernel.dk, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH v3 2/3] tracing/kprobes: Make setup_boot_kprobe_events() asynchronous Date: Tue, 27 Jan 2026 09:23:12 +0800 Message-Id: <20260127012312.84659-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260127012016.76713-1-tianyaxiong@kylinos.cn> References: <20260127012016.76713-1-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" 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 --- 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); =20 +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); =20 - 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); 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Tue, 27 Jan 2026 09:23:24 +0800 From: Yaxiong Tian To: rostedt@goodmis.org, axboe@kernel.dk, mhiramat@kernel.org, mathieu.desnoyers@efficios.com Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Yaxiong Tian Subject: [PATCH v3 3/3] blktrace: Make init_blk_tracer() asynchronous Date: Tue, 27 Jan 2026 09:23:20 +0800 Message-Id: <20260127012320.85097-1-tianyaxiong@kylinos.cn> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260127012016.76713-1-tianyaxiong@kylinos.cn> References: <20260127012016.76713-1-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 mitigate this contention, we have moved init_blk_tracer() to the trace_init_wq workqueue, allowing it to execute asynchronously and prevent blocking the main boot thread. Signed-off-by: Yaxiong Tian --- 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 2.25.1