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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-c45ff70000001609-2b-6932876a9648 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, 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ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev, 2407018371@qq.com, dakr@kernel.org, miguel.ojeda.sandonis@gmail.com, neilb@ownmail.net, bagasdotme@gmail.com, wsa+renesas@sang-engineering.com, dave.hansen@intel.com, geert@linux-m68k.org, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, rust-for-linux@vger.kernel.org Subject: [PATCH v18 02/42] dept: add single event dependency tracker APIs Date: Fri, 5 Dec 2025 16:18:15 +0900 Message-Id: <20251205071855.72743-3-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251205071855.72743-1-byungchul@sk.com> References: <20251205071855.72743-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa0xTZxjHfc95z+lpY/WkmHjGPmCaLCYoDgiaZxkzxg/mGDNDMk1U5qWR E1stoC1yMTPWcmnXqGE1QKCoBYairVLbLMOOai0GJUAoEqBhQIsQkBTihlTCZbAW45cnvyf/ y6c/Q8qGqHhGlZMnaHIUajktwZLZjfVJFwypqmSfUQzG0mswHJygYOC6F0Nk3oihttlOg9FZ TcGbQT0G/xMbgmDEiGBh2ULCf+Z2Ecwv/i2CNU87gspeMwkfHas0hNvmEFSMTdCwNjJFwITX gOBevSsqVP5Dw3J3DwlVFX4EdWMjJMxNhxB4mvQ09E1sAqveQ8EdixnB5JCHgOKGZhqehdwi 6A2vEGBz/gid5fUEVE3TYKkqJqLnPQEVj/8ioKthGIOlu4+Cd001IlgZS4E1ay48me2hoGN0 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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 | 65 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 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..0535f763b21b --- /dev/null +++ b/include/linux/dept_sdt.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Single-event Dependency Tracker + * + * Started by Byungchul Park : + * + * Copyright (c) 2020 LG Electronics, Inc., Byungchul Park + * Copyright (c) 2024 SK hynix, 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