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linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v17 03/47] dept: add single event dependency tracker APIs Date: Thu, 2 Oct 2025 17:12:03 +0900 Message-Id: <20251002081247.51255-4-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxTZxTH99yX5146mtwVEi5g5tKkWWJEx4J6El+izsQ7li0j+2Cic6PS m7WRF1O0WoMJCnVEnTZdwAnGQUc7giC1HYuAHa92ZvWFKmpRaCmBGlMKRtsS1NK1Gr/9Ts7v /M+XP0vKvHQOqyk/KGrLlaVyLKEk4fSWvPQCn/oz988I6uwXaPBH6xAsvm4iwdCToCBucjEQ WXrCQIPHRMJL2zKG0PALBPWBGQznnx2nYMF6BsGzGzsh7O+jITH5lIBHsTkE1pllAmYGksHx hv3wu9mR9OtHEbQEJkn4y+VD4Gw7gWHW2E3CWHQBQ9hzkYB5G4aaP7ow9Ez1MnDZ/jX4rUEq +QlDw9UsaDpfQ0B9Zx8BS9Z2BqzVCphua2TgTSAfEs0VcCV8l4ZQ0ITBPn4DQWQsQEDLyVYK LlyawFAXjyBwXZsm4H7vRQxnbN00+DoSNFQ3LdIwOuCmoeuplwC36yYFlkceAgJTXhoct2+R 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X-HE-Tag: 1759392792-481540 X-HE-Meta: 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 uO74Qlg+ qnM+AmivqV5heCxOv2wfFYm9ZY4CKdwcsoCm4/Tfj5BgNKNBX+AdLsIKlTBqsI/qw0UOW+lZKYcr76COh5eMunpyvBE50St7HbDK2PS1/IufJB5c= 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