| Message ID | 20220225130712.12682-1-sj@kernel.org (mailing list archive) |
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Return-Path: <owner-linux-mm@kvack.org> 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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B99DC433F5 for <linux-mm@archiver.kernel.org>; Fri, 25 Feb 2022 13:07:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 947C18D0002; Fri, 25 Feb 2022 08:07:24 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8F7368D0001; Fri, 25 Feb 2022 08:07:24 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7E51B8D0002; Fri, 25 Feb 2022 08:07:24 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.27]) by kanga.kvack.org (Postfix) with ESMTP id 705BB8D0001 for <linux-mm@kvack.org>; Fri, 25 Feb 2022 08:07:24 -0500 (EST) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 4120A23C11 for <linux-mm@kvack.org>; Fri, 25 Feb 2022 13:07:24 +0000 (UTC) X-FDA: 79181328408.10.D5332D8 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf06.hostedemail.com (Postfix) with ESMTP id 94D4518000A for <linux-mm@kvack.org>; Fri, 25 Feb 2022 13:07:23 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D729E61C58; Fri, 25 Feb 2022 13:07:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C241C340E7; Fri, 25 Feb 2022 13:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645794442; bh=ZUFJT4ywE29W78D9GKOYSIKqDWeccLmuYfsgdarTsgU=; h=From:To:Cc:Subject:Date:From; b=LMbBmRMpP8GRphnysgLov+NXxY+6C6crc3SpncSlZ7l1zXUHMkBZNkAF2rjCVFTmk JWabw+gZqQrujIyxGcEbhtLzqNPNtY4upKJ0mQK2F4ZOjaHbcopAAy5m7pZ2pVIKAU OW2Iak/Wpqui1reVC0T7rXxQAczEchej5SUxgWfsKkW510VrZ0PTH9AVGlVF2lSN3r jP/wktSCsmZckzPlErP7P33o0JFaMP8L7rDGCjiBWM94MI1Jih4Wj5GSeX6OPnrMhe ZN7MICqWfxvr3SQlRGscaxSZOKCQl9mYlTokYVS+6U4dtur2sGeHg7yK+4yBEbQQTu jK8KEKREfeeiQ== From: SeongJae Park <sj@kernel.org> To: akpm@linux-foundation.org Cc: corbet@lwn.net, skhan@linuxfoundation.org, rientjes@google.com, xhao@linux.alibaba.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, SeongJae Park <sj@kernel.org> Subject: [PATCH v2 00/13] Introduce DAMON sysfs interface Date: Fri, 25 Feb 2022 13:06:59 +0000 Message-Id: <20220225130712.12682-1-sj@kernel.org> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 94D4518000A X-Stat-Signature: qroux7qjs16qtb8s374ztitummcn859k Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=LMbBmRMp; spf=pass (imf06.hostedemail.com: domain of sj@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Rspam-User: X-HE-Tag: 1645794443-591440 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: <linux-mm.kvack.org> |
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Introduce DAMON sysfs interface
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Changes from Previous Version (v1) ================================== Compared to the v1 of this patchset (https://lore.kernel.org/linux-mm/20220223152051.22936-1-sj@kernel.org/), this version contains below changes. - Use __ATTR_R{O,W}_MODE() instead of __ATTR() (Greg KH) - Change some file names for using __ATTR_R{O,W}_MODE() (Greg KH) - Add ABI document (Greg KH) Introduction ============ DAMON's debugfs-based user interface (DAMON_DBGFS) served very well, so far. However, it unnecessarily depends on debugfs, while DAMON is not aimed to be used for only debugging. Also, the interface receives multiple values via one file. For example, schemes file receives 18 values. As a result, it is inefficient, hard to be used, and difficult to be extended. Especially, keeping backward compatibility of user space tools is getting only challenging. It would be better to implement another reliable and flexible interface and deprecate DAMON_DBGFS in long term. For the reason, this patchset introduces a sysfs-based new user interface of DAMON. The idea of the new interface is, using directory hierarchies and having one dedicated file for each value. For a short example, users can do the virtual address monitoring via the interface as below: # cd /sys/kernel/mm/damon/admin/ # echo 1 > kdamonds/nr_kdamonds # echo 1 > kdamonds/0/contexts/nr_contexts # echo vaddr > kdamonds/0/contexts/0/operations # echo 1 > kdamonds/0/contexts/0/targets/nr_targets # echo $(pidof <workload>) > kdamonds/0/contexts/0/targets/0/pid_target # echo on > kdamonds/0/state A brief representation of the files hierarchy of DAMON sysfs interface is as below. Childs are represented with indentation, directories are having '/' suffix, and files in each directory are separated by comma. /sys/kernel/mm/damon/admin │ kdamonds/nr_kdamonds │ │ 0/state,pid │ │ │ contexts/nr_contexts │ │ │ │ 0/operations │ │ │ │ │ monitoring_attrs/ │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us │ │ │ │ │ │ nr_regions/min,max │ │ │ │ │ targets/nr_targets │ │ │ │ │ │ 0/pid_target │ │ │ │ │ │ │ regions/nr_regions │ │ │ │ │ │ │ │ 0/start,end │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ │ schemes/nr_schemes │ │ │ │ │ │ 0/action │ │ │ │ │ │ │ access_pattern/ │ │ │ │ │ │ │ │ sz/min,max │ │ │ │ │ │ │ │ nr_accesses/min,max │ │ │ │ │ │ │ │ age/min,max │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds │ │ │ │ │ │ ... │ │ │ │ ... │ │ ... Detailed usage of the files will be described in the final Documentation patch of this patchset. Main Difference Between DAMON_DBGFS and DAMON_SYSFS --------------------------------------------------- At the moment, DAMON_DBGFS and DAMON_SYSFS provides same features. One important difference between them is their exclusiveness. DAMON_DBGFS works in an exclusive manner, so that no DAMON worker thread (kdamond) in the system can run concurrently and interfere somehow. For the reason, DAMON_DBGFS asks users to construct all monitoring contexts and start them at once. It's not a big problem but makes the operation a little bit complex and unflexible. For more flexible usage, DAMON_SYSFS moves the responsibility of preventing any possible interference to the admins and work in a non-exclusive manner. That is, users can configure and start contexts one by one. Note that DAMON respects both exclusive groups and non-exclusive groups of contexts, in a manner similar to that of reader-writer locks. That is, if any exclusive monitoring contexts (e.g., contexts that started via DAMON_DBGFS) are running, DAMON_SYSFS does not start new contexts, and vice versa. Future Plan of DAMON_DBGFS Deprecation ====================================== Once this patchset is merged, DAMON_DBGFS development will be frozen. That is, we will maintain it to work as is now so that no users will be break. But, it will not be extended to provide any new feature of DAMON. The support will be continued only until next LTS release. After that, we will drop DAMON_DBGFS. User-space Tooling Compatibility -------------------------------- As DAMON_SYSFS provides all features of DAMON_DBGFS, all user space tooling can move to DAMON_SYSFS. As we will continue supporting DAMON_DBGFS until next LTS kernel release, user space tools would have enough time to move to DAMON_SYSFS. The official user space tool, damo[1], is already supporting both DAMON_SYSFS and DAMON_DBGFS. Both correctness tests[2] and performance tests[3] of DAMON using DAMON_SYSFS also passed. [1] https://github.com/awslabs/damo [2] https://github.com/awslabs/damon-tests/tree/master/corr [3] https://github.com/awslabs/damon-tests/tree/master/perf Complete Git Tree ================= You can get the complete git tree from https://git.kernel.org/sj/h/damon/sysfs/patches/v2. Sequence of Patches =================== First two patches (patches 1-2) make core changes for DAMON_SYSFS. The first one (patch 1) allows non-exclusive DAMON contexts so that DAMON_SYSFS can work in non-exclusive mode, while the second one (patch 2) adds size of DAMON enum types so that DAMON API users can safely iterate the enums. Third patch (patch 3) implements basic sysfs stub for virtual address spaces monitoring. Note that this implements only sysfs files and DAMON is not linked. Fourth patch (patch 4) links the DAMON_SYSFS to DAMON so that users can control DAMON using the sysfs files. Following six patches (patches 5-10) implements other DAMON features that DAMON_DBGFS supports one by one (physical address space monitoring, DAMON-based operation schemes, schemes quotas, schemes prioritization weights, schemes watermarks, and schemes stats). Following patch (patch 11) adds a simple selftest for DAMON_SYSFS, and the final one (patch 12) documents DAMON_SYSFS. Patch History ============= Changes from Previous Version (v1) ================================== Changes from v1 (https://lore.kernel.org/linux-mm/20220223152051.22936-1-sj@kernel.org/) - Use __ATTR_R{O,W}_MODE() instead of __ATTR() (Greg KH) - Change some file names for using __ATTR_R{O,W}_MODE() (Greg KH) - Add ABI document (Greg KH) Chages from RFC (https://lore.kernel.org/linux-mm/20220217161938.8874-1-sj@kernel.org/) - Implement all DAMON debugfs interface providing features - Writeup documents - Add more selftests SeongJae Park (13): mm/damon/core: Allow non-exclusive DAMON start/stop mm/damon/core: Add number of each enum type values mm/damon: Implement a minimal stub for sysfs-based DAMON interface mm/damon/sysfs: Link DAMON for virtual address spaces monitoring mm/damon/sysfs: Support the physical address space monitoring mm/damon/sysfs: Support DAMON-based Operation Schemes mm/damon/sysfs: Support DAMOS quotas mm/damon/sysfs: Support schemes prioritization mm/damon/sysfs: Support DAMOS watermarks mm/damon/sysfs: Support DAMOS stats selftests/damon: Add a test for DAMON sysfs interface Docs/admin-guide/mm/damon/usage: Document DAMON sysfs interface Docs/ABI/testing: Add DAMON sysfs interface ABI document .../ABI/testing/sysfs-kernel-mm-damon | 276 ++ Documentation/admin-guide/mm/damon/usage.rst | 350 ++- MAINTAINERS | 1 + include/linux/damon.h | 6 +- mm/damon/Kconfig | 7 + mm/damon/Makefile | 1 + mm/damon/core.c | 23 +- mm/damon/dbgfs.c | 2 +- mm/damon/reclaim.c | 2 +- mm/damon/sysfs.c | 2594 +++++++++++++++++ tools/testing/selftests/damon/Makefile | 1 + tools/testing/selftests/damon/sysfs.sh | 306 ++ 12 files changed, 3552 insertions(+), 17 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-kernel-mm-damon create mode 100644 mm/damon/sysfs.c create mode 100755 tools/testing/selftests/damon/sysfs.sh