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[PATCH v12 03/27] dept: Add single event dependency tracker APIs Date: Wed, 21 Feb 2024 18:49:09 +0900 Message-Id: <20240221094933.36348-4-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240221094933.36348-1-byungchul@sk.com> References: <20240221094933.36348-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSe2xLcRTH97vvda1cRVyTsDRZyGze5IQRkeCKiNk8EiSU3lizh2npzCub 1WuvzOjKNmwjVVspLZlXqWK1LRirKWYowbLN2LTUNrTDPyeffM85n5w/DoNLr5HhjDJ1i6BK lSfLKBEh6hRXxIDzqTDR/C4GDuVNBO+3AwSUmU0UNJ6vRmC6lIVB270F8MzXgaD3wSMc9LpG BBVvX+FwqbYVgc24h4Km94PA5e2ioE6XS0H2KTMFj9v7MGgpLsKg2rIYGgorMbD7PxKgb6Og VJ+NBconDPyGKhoMmZHgMZbQ0Pd2EtS1NpNgezEOjp1ooeCGrY6A2iseDJqulVHQavpNQkPt fQIaD+WTcO5zJQXtPgMOBm8XDU/s5Rhc0AZE+3p+keDMt2Ow7/RFDFzPryO4eeANBhZTMwV3 vB0YWC06HH6euYfAU9BJw948Pw2lWQUIcvcWE/Co30mCtmUa9P4oo+bM4O90dOG81prO23zl BF9fyfFXS17RvPbmC5ovt2zlrcYo/tSNNoyv6PaSvKXqIMVbuotoPqfThfGfHz6k+ftHewn+ vUuPxY1cJYpVCMlKjaCaMHudKNFRWEKmPRu+zacfnYlc0hwUynDsVO6Drp7+z1n911GQKXYM 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 WY5n34U5 mu1l2pSejtrXCx45vHmB24NuC8J9aB8HpDLLMS1fTvd6/osL1e+ljyzQN5/hZfnv9pDeEPlh5+N8TsSVvqPEjhaex6g== 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 (the simplest way): 1. Initaialize a map for the interesting wait. /* * Recommand to place along with the wait instance. */ struct dept_map my_wait; /* * Recommand to 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 | 62 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 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..12a793b90c7e --- /dev/null +++ b/include/linux/dept_sdt.h @@ -0,0 +1,62 @@ +/* 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 = 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_) +#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) +#endif +#endif /* __LINUX_DEPT_SDT_H */ -- 2.17.1