From nobody Mon Feb 9 08:27:57 2026 Received: from invmail4.hynix.com (exvmail4.skhynix.com [166.125.252.92]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 2369C242D77; Tue, 13 May 2025 10:07:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=166.125.252.92 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747130868; cv=none; b=h38qKvHnO+IhMrbKVl05YpeJDRAdvC6YU9ynDSVHlMd4dRF/GglaWGiNWVHrgqAKeHybFeFxbiqZhel4YYjuP1L8IYpgH4dOb3cBgyP1/9K4ZpLe9cDvECCpRCbROUwo3RutY+MfCS1T7Kx1dKDbqzA7VaVBQzA/QDqMcTBX6QM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747130868; c=relaxed/simple; bh=QBX5hyho5OMfGnKSjp0Bq0FcSRd46hiVm1ArD8Nb7ms=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=WbqRY0D1F4ALJlC66hCrx26aSXwR8iUcj3zAkfEYl0cr2hzfsP+T/cKRspDsayb6omer2UU/EiHXaIzZcfEM5splZemEjJhbCbiuglvlY2XUSkbizq8I/4ls9fjhdmkBTH7HItrb0cqhbiELWN6BuRhVOzGKlF1dhLfI6beUf90= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-681ff7000002311f-ea-682319edb95d From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yskelg@gmail.com, yunseong.kim@ericsson.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v15 03/43] dept: add single event dependency tracker APIs Date: Tue, 13 May 2025 19:06:50 +0900 Message-Id: <20250513100730.12664-4-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250513100730.12664-1-byungchul@sk.com> References: <20250513100730.12664-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSfUxTZxSHfd/7SeWSazV60Tm1xpihIhg0x0SNWTS7M36QLEHFmNnJja0r YIqiNS6h8jGHQpgbNApoKUttaCtQyMaQEqilgs5aFbGYgkqcGeFroG1EYFvL9J+TJ+d3znP+ OSwh76QWs+qMk5I2Q6lR0DJSNhJtWjcSu1KV0JS7GYJvL5BQUWujwXfTisDWqMcw2PEFPA0N I5i6/4AAQ6kPQdXLPgIaPf0InJbzNDx+FQPdwTEaukov0pBbXUvDw6FpDIGyyxisjj3w3Pya hHslJgyGQRrKDbk4XP7CMGmuYcCcswoGLFcZmH6ZCF39PRQ4n62BK9cCNLQ4u0jwNA1geNxc QUO/7V8K7nk6SQgVLwHfj0UU2EdNNAyFzASYg2MMPGozYvAYF0JdXlhY8OYfCu4UtWEo+KUe Q3fvLQStF15gcNh6aLgdHMbQ4Cgl4P2NDgQDxSMM5F+aZKBcX4zgYn4ZCXmBjTD1Lny58m0i 6K/XkWCf6UHbt4q2azYk3h4eI8S8htPi++ATWnSGjKR41ySIv1/tY8S81meMaHScEhsscWJ1 yyAWqyaClOio+YEWHROXGbFwpBuLo14vk/xJqmxLmqRRZ0va9duOyFR9MwXUiZ+FM67RKSIH fT+/EEWxAp8k+P9oZz7yT7kTs0zzqwW/f5KI8AJ+udBQ9JoqRDKW4HvmCk8re1EkmM9/KdRX dMwyya8SagNuHGGO3yh4csrp/6XLBGtd26woit8kzNzwkhGWh2dKjFYyIhX48ihh9M/rHxZi hXaLnyxBnBHNqUFydUZ2ulKtSYpX6TLUZ+KPZqY7UPi/zN9NH2pCE76vXIhnkSKa6xxcoZJT yuwsXboLCSyhWMDpfwu3uDSl7qykzfxae0ojZbnQEpZULOI2hE6nyfljypPSt5J0QtJ+TDEb tTgHofzjBrXbObNfu/zI0rLtyQkrtumqvrlzfB7mfk1J3RnHJdcEljXX6w/0ZrcMKfPtjayq Iu2crrX9vpE77PEaPk1waSqTPnv+Zvfaz1fGH0zxxZTtG48mz+rcfycWmOy2Zn9sjNc6xzK+ f1xX7UthYoaS7O6mVPfeg5m32nYFdijILJUyMY7QZin/AyHKe6xbAwAA X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa0yTZxTHfZ73Vio1r0jmq8ZbjdFodKJAjnGSfdJHvH8gRoNKI6+2EZC0 gjI00lGYq9LgBVEoWAEroVWgaESkhhSpMCaiICABFKJklZsCbcbNrXXZl5Nfzv/kd778JVRA CbNQooo7LarjFDFyVkpL92xJXTe0YIVyw+Vvi8E9fpEGY6mVheYHFgTWh1oMrrrt0O4ZRDD1 8hUF2VnNCO70dlPw0NmDwF78KwstH+dAq3uEhYasSyykFpay8HpgGkPXjasYLLbd8N7cT0Nj ZgGGbBcLudmp2Dv+wjBhLuHAnLIS+opzOJjuDYKGnjYGavMaGLB3roVb+V0sVNsbaHBW9mFo qTKy0GP9h4FGZz0NHsMiaL6SwcD94QIWBjxmCszuEQ7e1JgwOE0/QJnOa00f+8bAi4waDOlF 5Rha3z1F8OziBww2axsLte5BDBW2LAom79Uh6DMMcZB2eYKDXK0BwaW0GzToukJg6m/v57zx INDeLqPh/kwb+jmMWPOtiNQOjlBEV3GGTLrfssTuMdHkjwKBPMnp5ojuWSdHTLYEUlG8hhRW uzC5M+pmiK3kd5bYRq9yRD/UislwUxO3b/Eh6U/RYowqUVT/GBYlVXbPpDPx14WzjuEpKgX9 Nk+P/CQCHyxcSx3lfMzyq4SOjgnKx4H8MqEio5/RI6mE4ttmC+1575AvmMfvEMqNdd+Z5lcK pV3PsY9lfIjgTMll/5MuFSxlNd9FfnyoMHOvifZxgPcm02ShM5HUhGaVoEBVXGKsQhUTsl5z UpkUpzq7/tipWBvyNsh8fvpKJRpv2e5AvATJ/WX1ruXKAEaRqEmKdSBBQskDZdrH3pUsWpH0 i6g+dVSdECNqHGiRhJbPl4UfEKMC+BOK0+JJUYwX1f+nWOK3MAWV7w9uP1wUjncnhX96ZDSE 6bY5jic3fZ06uFr/yWo4pHCV+28rHDMmb22srzvXv2Tdha9BkeaIN9zcTb32kMhBsjNN1Ebx uzbnD0Rv9A/uqN9q+ayv6jmo/fLxyJL4u8mhEZWTVXvl1WOe5aF+vQ7yYtoQ/2rfgT+RZsGG SPvND4VyWqNUBK2h1BrFv1Hq/mE9AwAA X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Wrapped the base APIs for easier annotation on wait and event. Start with supporting waiters on each single event. More general support for multiple events is a future work. Do more when the need arises. How to annotate: 1. Initaialize a map for the interesting wait. /* * Place along with the wait instance. */ struct dept_map my_wait; /* * Place in the initialization code. */ sdt_map_init(&my_wait); 2. Place the following at the wait code. sdt_wait(&my_wait); 3. Place the following at the event code. sdt_event(&my_wait); That's it! Signed-off-by: Byungchul Park --- include/linux/dept_sdt.h | 64 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 include/linux/dept_sdt.h diff --git a/include/linux/dept_sdt.h b/include/linux/dept_sdt.h new file mode 100644 index 000000000000..93d772c71905 --- /dev/null +++ b/include/linux/dept_sdt.h @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Single-event Dependency Tracker + * + * Started by Byungchul Park : + * + * Copyright (c) 2020 LG Electronics, Inc., Byungchul Park + */ + +#ifndef __LINUX_DEPT_SDT_H +#define __LINUX_DEPT_SDT_H + +#include +#include + +#ifdef CONFIG_DEPT +#define sdt_map_init(m) \ + do { \ + static struct dept_key __key; \ + dept_map_init(m, &__key, 0, #m); \ + } while (0) + +#define sdt_map_init_key(m, k) dept_map_init(m, k, 0, #m) + +#define sdt_wait(m) \ + do { \ + dept_request_event(m); \ + dept_wait(m, 1UL, _THIS_IP_, __func__, 0); \ + } while (0) + +/* + * sdt_might_sleep() and its family will be committed in __schedule() + * when it actually gets to __schedule(). Both dept_request_event() and + * dept_wait() will be performed on the commit. + */ + +/* + * Use the code location as the class key if an explicit map is not used. + */ +#define sdt_might_sleep_start(m) \ + do { \ + struct dept_map *__m =3D m; \ + static struct dept_key __key; \ + dept_stage_wait(__m, __m ? NULL : &__key, _THIS_IP_, __func__);\ + } while (0) + +#define sdt_might_sleep_end() dept_clean_stage() + +#define sdt_ecxt_enter(m) dept_ecxt_enter(m, 1UL, _THIS_IP_, "start", "ev= ent", 0) +#define sdt_event(m) dept_event(m, 1UL, _THIS_IP_, __func__) +#define sdt_ecxt_exit(m) dept_ecxt_exit(m, 1UL, _THIS_IP_) +#define sdt_request_event(m) dept_request_event(m) +#else /* !CONFIG_DEPT */ +#define sdt_map_init(m) do { } while (0) +#define sdt_map_init_key(m, k) do { (void)(k); } while (0) +#define sdt_wait(m) do { } while (0) +#define sdt_might_sleep_start(m) do { } while (0) +#define sdt_might_sleep_end() do { } while (0) +#define sdt_ecxt_enter(m) do { } while (0) +#define sdt_event(m) do { } while (0) +#define sdt_ecxt_exit(m) do { } while (0) +#define sdt_request_event(m) do { } while (0) +#endif +#endif /* __LINUX_DEPT_SDT_H */ --=20 2.17.1