From nobody Mon Feb 9 05:59:23 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 224D7157487 for ; Mon, 10 Feb 2025 04:26:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739161609; cv=none; b=LJHLFzQHLR5P+71Ts8IS78uYZUudTgL7Dh3FGZ9TpA3rlpqLuJpsoZlegcyxzuW7pr3W7u984/PQGMblgmCB7Mklywfe+7PUchfapKc3KVzGuFUSESAK3gnaVaDkP2RHWkoGmiHXGcs98IgwWhwscTc/Aq5LZgoOBiFkGSf6mbM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1739161609; c=relaxed/simple; bh=EUVQgYDdQvDpbP5AdqIWHackolUC0UTmiQ6+5AfhcxM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kuHVwG7w0D+vsUFPQ6pAooUGCrE//fQWWo4Ytwv3qyREpDd2GKqOKSGATAiunTmfnUy0vqDf+uyv3oEs8yCzY/OGAY/fytNcrEeqUA0vRFiNTeW1uVz8EBGrrwfAT2e70ABPJI5clivKs6faOPv4IHM4TopmVAYK2xGreuY+pxk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Pe1fZe+x; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Pe1fZe+x" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1739161606; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=jCz7+XdNeTmg0ywryfA79K8sDfbhrWMKHNAgiZbFNpE=; b=Pe1fZe+xFxMb7+BGLL2zWEQ1rBf4N6PfQS3CMuKzPVz8vcYq/a7byh4Js7AL2pnwNuaxUq w6BebJE8+BXMaK6rqb/H1cgPYAQwvSZPGueWynHhop6qKLl+8wgQy7j7MDD3iF4rtjAkJd SXCHEXtPx2/SO9Xs4rk/YSeQQFGBJwg= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-572-8JHCXfg3MX6Mjy0KrOmx7Q-1; Sun, 09 Feb 2025 23:26:43 -0500 X-MC-Unique: 8JHCXfg3MX6Mjy0KrOmx7Q-1 X-Mimecast-MFC-AGG-ID: 8JHCXfg3MX6Mjy0KrOmx7Q Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 56F271800875; Mon, 10 Feb 2025 04:26:41 +0000 (UTC) Received: from llong-thinkpadp16vgen1.westford.csb (unknown [10.22.88.34]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 06CEF19560A3; Mon, 10 Feb 2025 04:26:39 +0000 (UTC) From: Waiman Long To: Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng Cc: linux-kernel@vger.kernel.org, Waiman Long Subject: [PATCH v3 2/3] locking/lock_events: Add locking events for lockdep Date: Sun, 9 Feb 2025 23:26:11 -0500 Message-ID: <20250210042612.978247-3-longman@redhat.com> In-Reply-To: <20250210042612.978247-1-longman@redhat.com> References: <20250210042612.978247-1-longman@redhat.com> 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 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" Add some lock events to the lockdep for profiling its behavior. Signed-off-by: Waiman Long --- kernel/locking/lock_events_list.h | 7 +++++++ kernel/locking/lockdep.c | 8 +++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/kernel/locking/lock_events_list.h b/kernel/locking/lock_events= _list.h index 80b11f194c9f..9ef9850aeebe 100644 --- a/kernel/locking/lock_events_list.h +++ b/kernel/locking/lock_events_list.h @@ -88,3 +88,10 @@ LOCK_EVENT(rtmutex_slow_acq3) /* # of locks acquired in = *block() */ LOCK_EVENT(rtmutex_slow_sleep) /* # of sleeps */ LOCK_EVENT(rtmutex_slow_wake) /* # of wakeup's */ LOCK_EVENT(rtmutex_deadlock) /* # of rt_mutex_handle_deadlock()'s */ + +/* + * Locking events for lockdep + */ +LOCK_EVENT(lockdep_acquire) +LOCK_EVENT(lockdep_lock) +LOCK_EVENT(lockdep_nocheck) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 4470680f0226..8436f017c74d 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -61,6 +61,7 @@ #include =20 #include "lockdep_internals.h" +#include "lock_events.h" =20 #include =20 @@ -170,6 +171,7 @@ static struct task_struct *lockdep_selftest_task_struct; static int graph_lock(void) { lockdep_lock(); + lockevent_inc(lockdep_lock); /* * Make sure that if another CPU detected a bug while * walking the graph we dont change it (while the other @@ -5091,8 +5093,12 @@ static int __lock_acquire(struct lockdep_map *lock, = unsigned int subclass, if (unlikely(lock->key =3D=3D &__lockdep_no_track__)) return 0; =20 - if (!prove_locking || lock->key =3D=3D &__lockdep_no_validate__) + lockevent_inc(lockdep_acquire); + + if (!prove_locking || lock->key =3D=3D &__lockdep_no_validate__) { check =3D 0; + lockevent_inc(lockdep_nocheck); + } =20 if (subclass < NR_LOCKDEP_CACHING_CLASSES) class =3D lock->class_cache[subclass]; --=20 2.48.1