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yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v16 03/42] dept: add single event dependency tracker APIs Date: Mon, 19 May 2025 18:17:47 +0900 Message-Id: <20250519091826.19752-4-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250519091826.19752-1-byungchul@sk.com> References: <20250519091826.19752-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSWUwTYRDH/Xa3u22huKnXKhq0EQ+MKF6ZGM948Pmg8YoPGpVGVtsI1bSK oMGAHHJ7JEAUrLVIbWiR2qLiUYIQLg9EwXIIKKgEwhXRVkE8CpGXyS8z8//NywhJaZVghlCp OsWrVfIQGS2mxH2e+sWqH36KpfkDc8D5PYGC7AIzDbV3TQjMhdEEdJcHQoOrF8GvV69JyEyv RXCrvZWEwoo2BHbjBRrqPntBvXOAhur0ZBpicgpoeNMzQkBLxlUCTNbt8MHQScGLy3oCMrtp yMqMIdyli4AhQx4Dhihf6DBeZ2CkPQCq2xwCsDcvgmvaFhqe2qspqCjqIKDucTYNbea/AnhR UUWBK80baq+kCiC/X09Dj8tAgsE5wMDbEh0BFbqpYIl1C+O//RFAZWoJAfG37xFQ3/QEQXHC RwKsZgcNZc5eAmzWdBKG75Qj6EjrYyAuZYiBrOg0BMlxGRTEtqyEXz/dl298D4DomxYK8n87 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1747646324-71876 X-HE-Meta: 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 LM/sxCt0 8/FkPbsvupIFOMaOYbfoZiNwEP5YRFXPpq90/7sMzrmnZ+ZJkN5/scBZzLg8fGV+jqU3kJ3vNYaj2zCPOl5XAAn2b/A== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 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