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okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, trondmy@kernel.org, anna@kernel.org, kees@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, mark.rutland@arm.com, ada.coupriediaz@arm.com, kristina.martsenko@arm.com, wangkefeng.wang@huawei.com, broonie@kernel.org, kevin.brodsky@arm.com, dwmw@amazon.co.uk, shakeel.butt@linux.dev, ast@kernel.org, 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 v19 02/40] dept: add single event dependency tracker APIs Date: Mon, 6 Jul 2026 15:18:50 +0900 Message-Id: <20260706061928.66713-3-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260706061928.66713-1-byungchul@sk.com> References: <20260706061928.66713-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxTdxTG/d/7v7cvo3pTjf7nPrjUMXwJSg1bzodF3avXqYnLvmwjThu5 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 7zke+dmS HI53wJSAuNYtzy4OybrOOr8RncG7ebggq9vSecHGoNpnWlRoQqdl/wq9NboZfmq80taT3WWzXUTSbt2xgZ/sj26rBdQnhspRUMJvPIhv5BscCpUiFMrwTmFdcH6Y0x+Ffd5QKnLPccB65CnkFpdIxDTg1SsrnAEpU4fmYmHA0ieE/z5tUkxjS+eYmjqPj7dEJokCM Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 = 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", "event", 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 */ -- 2.17.1