From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C5AAAD2E014 for ; Fri, 5 Dec 2025 07:20:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 259CD6B00CC; Fri, 5 Dec 2025 02:19:56 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 00C866B00D3; Fri, 5 Dec 2025 02:19:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C41946B00CF; Fri, 5 Dec 2025 02:19:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 8DB1D6B00CE for ; Fri, 5 Dec 2025 02:19:55 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 2F9FE13B110 for ; Fri, 5 Dec 2025 07:19:55 +0000 (UTC) X-FDA: 84184567950.12.17046F4 Received: from invmail4.hynix.com (exvmail4.skhynix.com [166.125.252.92]) by imf14.hostedemail.com (Postfix) with ESMTP id 10719100008 for ; Fri, 5 Dec 2025 07:19:52 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; spf=pass (imf14.hostedemail.com: domain of byungchul@sk.com designates 166.125.252.92 as permitted sender) smtp.mailfrom=byungchul@sk.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1764919193; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:content-type: content-transfer-encoding:in-reply-to:in-reply-to: references:references; bh=XYvLnFU7p4k6RdXHiiqjPg2FVqRQ+ke3blM4eEqwJHs=; b=vAyQLuQg70gv5K3LUoBjjiq/V64z6dv8izJL8Ztfi9S+pblzIb28QAKw9d3YyKc5mPJIsA n+uCAh9dzo/AbJKEVJY6vsfLZWF6lQIwmsWQwxrxGPoPJsnqrXckqDUxZkt7s5wNX6eTZp SdfYtkY2txdm/T+CICohpxC4NI7C3So= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf14.hostedemail.com: domain of byungchul@sk.com designates 166.125.252.92 as permitted sender) smtp.mailfrom=byungchul@sk.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1764919193; a=rsa-sha256; cv=none; b=hCtzl1vXjKZDIfo78SSutc/rZe3rUhWt1gOGvdbf6QqMo3f0rmCr1XqT0bz8uup4DBIMgQ OhLbdVgl6/AQ/gAzm3W1CMf/8UuBnZZaRfE2yXvR7D3DHsXxBR3WH1HXj4W2n01w+yMkOQ fpYztV7UKW/azfs9LKLNKsyA2aUSeFk= X-AuditID: a67dfc5b-c45ff70000001609-2b-6932876a9648 From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yunseong.kim@ericsson.com, ysk@kzalloc.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com, corbet@lwn.net, catalin.marinas@arm.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, luto@kernel.org, sumit.semwal@linaro.org, gustavo@padovan.org, christian.koenig@amd.com, andi.shyti@kernel.org, arnd@arndb.de, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, mcgrof@kernel.org, petr.pavlu@suse.com, da.gomez@kernel.org, samitolvanen@google.com, paulmck@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, chuck.lever@oracle.com, neil@brown.name, 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 v18 02/42] dept: add single event dependency tracker APIs Date: Fri, 5 Dec 2025 16:18:15 +0900 Message-Id: <20251205071855.72743-3-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251205071855.72743-1-byungchul@sk.com> References: <20251205071855.72743-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSa0xTZxjHfc95z+lpY/WkmHjGPmCaLCYoDgiaZxkzxg/mGDNDMk1U5qWR E1stoC1yMTPWcmnXqGE1QKCoBYairVLbLMOOai0GJUAoEqBhQIsQkBTihlTCZbAW45cnvyf/ y6c/Q8qGqHhGlZMnaHIUajktwZLZjfVJFwypqmSfUQzG0mswHJygYOC6F0Nk3oihttlOg9FZ TcGbQT0G/xMbgmDEiGBh2ULCf+Z2Ecwv/i2CNU87gspeMwkfHas0hNvmEFSMTdCwNjJFwITX gOBevSsqVP5Dw3J3DwlVFX4EdWMjJMxNhxB4mvQ09E1sAqveQ8EdixnB5JCHgOKGZhqehdwi 6A2vEGBz/gid5fUEVE3TYKkqJqLnPQEVj/8ioKthGIOlu4+Cd001IlgZS4E1ay48me2hoGN0 gILwpJmG4OsyCv7UhURgvzFJgtEdweAcj6p1Zb9jaG95R0Cfu5aGG44/KBi1r1GgsyxQ4Pd2 UvDW5sfQPBUgoKPmIYbGwV4CxkIBal8Wv1B6C/P2u3bELy+ZET/fWEzypeXRt23mA8mXuAr4 pUg/zXs+WTH/W3cS/6xmRMSXPB8S8VbnZb7k1SzFu5oS+YbWaSJjxwlJepagVuULmm/3npEo P/Y2kxe7uML6UQfWIVecCTEMx6ZxluuHTUi8jj3eahxjmt3OBQKLZIy3sNs4181JyoQkDMn2 JXCGxVtkLBvHHuRuDx2NeTD7DdfSbSRiLGV3cxFbNf25M4GzObzrPWJ2D1cxuLTOsqjnnmlh vZNjH4g5vyeIPge+4l42BXA5klrRhkdIpsrJz1ao1Gm7lEU5qsJdZ3OznSi6uPtXVzJb0Jz/ Jx9iGSTfKPUWpKhklCJfW5TtQxxDyrdIZ9TJKpk0S1F0RdDkntZcVgtaH/qawfKt0tRPBVky 9pwiT7ggCBcFzReVYMTxOvSzpFVxaqVls+PAvsT92heVPkdtXMbV7f2G/sxDZUmW7+RpCblP Zz7s0dO/FIb6L6Xuz0iWHXHoF4+ePLCqm0nQiKfvhOLcb+ZbTULmMX6bW3Pu+K8/JIVXO/89 H1Rekbe1mZUyLq/rLhqo/n7KGb6WnlLQGe8YX2rMr+sYNuy0yrFWqUhJJDVaxf+EPtdSbQMA AA== X-Brightmail-Tracker: H4sIAAAAAAAAAzWSbUxScRTG+997uVxJ6o5c3VnNxlatF80y22m9zNaWt7ayVq3Wl2J1lwSa A7Os9aLGJCunNCAkyyiphNSkIjMmWbreXJKVzjdqEenUbAoaGhnW+nL2O3ue8+z5cChcZOdF UtLUdE6RKpGLSQEh2LIqJ/pQ7jJp7GBnJKhVp6HD7eHBxywnAX6fmoArFVYSgkY7H9RVBh68 aMkmoKncgsDtVyMYGTPioKoeJyCoaeCDL9DOB20WgnFHAwKdS4NDa1MtDtb7WRgMVf4moffZ IALtZw8J+p4sAgbMFxAUeY186KlPhH53DQ/GO79h0DLch8Ds+Y2Bx5mLIKiTwTWTLXSu+0HC WONbHPTaJgTXP3fiMNjzCcH9hi4EjtvZJHwteIBDs2cKvPcPkPBSe56EftcVDL5XklCS7eCB 600vgmKjBoG3zYFBzo0KEnTFVQRUf3rMB1fvLww6dBoMLFWbwW32EvC6wISF6oZc92aAUZ+D hUY3Btq7NRgEzGX8hFLEjqjyCbbM9hBjVe+CJGu9akXs2KgGsb7SHJxVFYTWZ30DOHvWdpQt fd1HsqP+DyTrGC4h2Fcmhr15bhRjCxuj2eqiTv7WdXsEqw9wcmkGp1iydp8gechVgae9YY6Z uiqJM8g2LQ+FUQy9nHnrNBATTNLzmdbWAD7BEfQcxnbRy8tDAgqnm6OY3EB+SKCoafRG5lLb zgkPQc9lHjWqsQkW0vGM32Ig/2VGMZZK59+cMHoFo20Z/cuikOda3givAAlK0KQyFCFNzUiR SOXxMUpZcmaq9FjM/sMpVSj0TuaTvwofIV9zYh2iKSQOFzqPLpWKeJIMZWZKHWIoXBwh7JPH SkXCA5LM45zi8F7FETmnrEMzKUI8Q7hpF7dPRB+UpHMyjkvjFP9VjAqLPIPu7diysnz5ne7n SWsSmPcyr2xF++LJCy/vnt59h1s/OGwyShLT9SvLtxu+747dekowZP8yZeRdftRsePJ0SWGc xndj1tRt+qBodrE9Zs18wyJLW239PEX95sjaqeF3b00PjO9Ns9d87IpLdnf/3PSt6PGCU3P7 mQ3+uKSk9mjbiYoTVjGhTJYsXYgrlJI/9TaX10oDAAA= X-CFilter-Loop: Reflected X-Rspam-User: X-Rspamd-Queue-Id: 10719100008 X-Rspamd-Server: rspam11 X-Stat-Signature: 9kco7s137xhgnb66iz6sebrfyxi5gj5n X-HE-Tag: 1764919192-841928 X-HE-Meta: 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 WcxAv3PN kk1OwKgBNs+TC1tCaBsbthaxwpqCaRq5rytslZQ/NGuq5a4qytS7Zf6SXyKHAGWRtjOvwVrLz3f5Rvq5+JXdGQc8gBcDLCsEQ5TyhXJfq1vgk5G4= 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