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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 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: H4sIAAAAAAAAAzWSbUhTYRiGe895z9lxuTgssZMG1SCKyrL84CnCgiLeSKQvCPpAT3loI102 dWkQzjJblqnBzGaGX5W5VboVmTnK/dBMrS1TpKb2hc3MMtMgJtVW9O+C+7rv58/D0UojE8Zp tBmSTiumqFg5lo8FV0XMjB5UR/b2x0Jf7mMMU5NGDFfuWFlw3bYg+O1oQ2C9m0uBebhcBr7u 5zR4G84g6PkwCzpM51ioPOlgoKL8IoLSChsG9+g0BZ7SixR0FldTUH7JS0FXjQdDeXcPA22W jzIYKDJh6BjsY2CoPZ+B+4Y3MrCeH6bB2DyFwfbeHzheLYMWRweGFxaX3zXfxPC8+RYDrpJC Bq5PfZVBbmsNhrpvlxiYqP2B4Yz3IQueC58w5Nc2UvDuwpgMLG4MpmkjC3meGKiYXAWTlnoW vhRPMhsiifWqFZE8+zFS0h1BHpgHZKTSlknsdUtJTcsIRWz1Z1lS5fPSpGDsJUWelPkwefB2 DakymGhytWM7sdfmEK/9MtoWuke+LllK0egl3cq4JLn6u/sOndYlZFUPNmADss8uQEGcwEcL Pksj/s+joyY2wCy/WOjv/0kHOIRfINgLh5kA03znPKHPvTzAs/ktwtCzXyjAmF8k2ByP/D7H KfgYYahI/29yvmBpePx3JoiPFXredv49pfQrp7/mUQVI7nduBAmOJ+P0v8JcobWuHxcjRSWa 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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