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 X-Spam-Level: X-Spam-Status: No, score=-8.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6888BC433DF for ; Tue, 26 May 2020 07:58:02 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0907420776 for ; Tue, 26 May 2020 07:58:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="WZCOFwVT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0907420776 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 7817D80089; Tue, 26 May 2020 03:58:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6BE8380061; Tue, 26 May 2020 03:58:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5619E80089; Tue, 26 May 2020 03:58:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0185.hostedemail.com [216.40.44.185]) by kanga.kvack.org (Postfix) with ESMTP id 38ABA80061 for ; Tue, 26 May 2020 03:58:01 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id F1398180AD811 for ; Tue, 26 May 2020 07:58:00 +0000 (UTC) X-FDA: 76858116720.05.bear74_801fb0ecdd032 X-HE-Tag: bear74_801fb0ecdd032 X-Filterd-Recvd-Size: 11427 Received: from smtp-fw-6001.amazon.com (smtp-fw-6001.amazon.com [52.95.48.154]) by imf31.hostedemail.com (Postfix) with ESMTP for ; Tue, 26 May 2020 07:58:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1590479880; x=1622015880; h=from:to:cc:subject:date:message-id:mime-version; bh=wjbooE5E+0/1ZJl/GInuLl4ZaJl/dSdTWgA+AhspDnU=; b=WZCOFwVT3iovlhSx0OIR9+BFLnY2FFeIPrw3dO6zbhWxg0v/piFmTyjO AalcadMgZcKF6Jv1MKQdVFHsdgjKukMnplKsgpf3oRX2ziFF3d8lv6RWQ blZiLf67ub7G9kQq+gD36KfDxB4epYHTKbLMFTxzG3ghUr3LPnZmTeWR8 c=; IronPort-SDR: 6sxX3wqf0a++mF162lgHo3kf0lHF1++GRc9fzXNpkKSbj02t26zDo1vfLvXW8KAtOtSez2LK6e ALZOQfYHGHXg== X-IronPort-AV: E=Sophos;i="5.73,436,1583193600"; d="scan'208";a="33537483" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO email-inbound-relay-1e-303d0b0e.us-east-1.amazon.com) ([10.43.8.6]) by smtp-border-fw-out-6001.iad6.amazon.com with ESMTP; 26 May 2020 07:57:48 +0000 Received: from EX13MTAUEA002.ant.amazon.com (iad55-ws-svc-p15-lb9-vlan3.iad.amazon.com [10.40.159.166]) by email-inbound-relay-1e-303d0b0e.us-east-1.amazon.com (Postfix) with ESMTPS id 5AB8FA0669; Tue, 26 May 2020 07:57:37 +0000 (UTC) Received: from EX13D31EUA001.ant.amazon.com (10.43.165.15) by EX13MTAUEA002.ant.amazon.com (10.43.61.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 26 May 2020 07:57:36 +0000 Received: from u886c93fd17d25d.ant.amazon.com (10.43.161.193) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 26 May 2020 07:57:21 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC v9 0/8] Implement Data Access Monitoring-based Memory Operation Schemes Date: Tue, 26 May 2020 09:56:54 +0200 Message-ID: <20200526075702.27339-1-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.43.161.193] X-ClientProxiedBy: EX13D08UWB004.ant.amazon.com (10.43.161.232) To EX13D31EUA001.ant.amazon.com (10.43.165.15) 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: From: SeongJae Park DAMON[1] can be used as a primitive for data access awared memory management optimizations. For that, users who want such optimizations should run DAMON, read the monitoring results, analyze it, plan a new memory management scheme, and apply the new scheme by themselves. Such efforts will be inevitable for some complicated optimizations. However, in many other cases, the users would simply want the system to apply a memory management action to a memory region of a specific size having a specific access frequency for a specific time. For example, "page out a memory region larger than 100 MiB keeping only rare accesses more than 2 minutes", or "Do not use THP for a memory region larger than 2 MiB rarely accessed for more than 1 seconds". This RFC patchset makes DAMON to handle such data access monitoring-based operation schemes. With this change, users can do the data access aware optimizations by simply specifying their schemes to DAMON. [1] https://lore.kernel.org/linux-mm/20200525091512.30391-1-sjpark@amazon.com/ Evaluations =========== We evaluated DAMON's overhead, monitoring quality and usefulness using 25 realistic workloads on my QEMU/KVM based virtual machine. DAMON is lightweight. It increases system memory usage by only -0.39% and consumes less than 1% CPU time in most case. It slows target workloads down by only 0.63%. DAMON is accurate and useful for memory management optimizations. An experimental DAMON-based operation scheme for THP, 'ethp', removes 69.43% of THP memory overheads while preserving 37.11% of THP speedup. Another experimental DAMON-based 'proactive reclamation' implementation, 'prcl', reduces 89.30% of residential sets and 22.40% of system memory footprint while incurring only 1.98% runtime overhead in the best case (parsec3/freqmine). NOTE that the experimentail THP optimization and proactive reclamation are not for production, just only for proof of concepts. Please refer to the official document[1] or "Documentation/admin-guide/mm: Add a document for DAMON" patch in the latest DAMON patchset for detailed evaluation setup and results. [1] https://damonitor.github.io/doc/html/latest-damos More Information ================ We prepared a showcase web site[1] that you can get more information. There are - the official documentations[2], - the heatmap format dynamic access pattern of various realistic workloads for heap area[3], mmap()-ed area[4], and stack[5] area, - the dynamic working set size distribution[6] and chronological working set size changes[7], and - the latest performance test results[8]. [1] https://damonitor.github.io/_index [2] https://damonitor.github.io/doc/html/latest-damos [3] https://damonitor.github.io/test/result/visual/latest/heatmap.0.html [4] https://damonitor.github.io/test/result/visual/latest/heatmap.1.html [5] https://damonitor.github.io/test/result/visual/latest/heatmap.2.html [6] https://damonitor.github.io/test/result/visual/latest/wss_sz.html [7] https://damonitor.github.io/test/result/visual/latest/wss_time.html [8] https://damonitor.github.io/test/result/perf/latest/html/index.html Baseline and Complete Git Tree ============================== The patches are based on the v5.6 plus v11 DAMON patchset[1] and Minchan's ``do_madvise()`` patch[2]. Minchan's patch was necessary for reuse of ``madvise()`` code in DAMON. You can also clone the complete git tree: $ git clone git://github.com/sjp38/linux -b damos/rfc/v9 The web is also available: https://github.com/sjp38/linux/releases/tag/damos/rfc/v9 There are a couple of trees for entire DAMON patchset series. It includes future features. The first one[3] contains the changes for latest release, while the other one[4] contains the changes for next release. [1] https://lore.kernel.org/linux-mm/20200511123302.12520-1-sjpark@amazon.com/ [2] https://lore.kernel.org/linux-mm/20200302193630.68771-2-minchan@kernel.org/ [3] https://github.com/sjp38/linux/tree/damon/master [4] https://github.com/sjp38/linux/tree/damon/next Sequence Of Patches =================== The first patch allows DAMON to reuse ``madvise()`` code for the actions. The second patch accounts age of each region. The third patch implements the handling of the schemes in DAMON and exports a kernel space programming interface for it. The fourth patch implements a debugfs interface for the privileged people and programs. The fifth patch implements schemes statistics feature for easier tuning of the schemes and runtime access pattern analysis. The sixth patche adds selftests for these changes, and the seventhe patch adds human friendly schemes support to the user space tool for DAMON. Finally, the eighth patch documents this new feature in the document. Patch History ============= Changes from RFC v8 (https://lore.kernel.org/linux-mm/20200512115343.27699-1-sjpark@amazon.com/) - Rewrite the document (Stefan Nuernberger) - Make 'damon_for_each_*' argument order consistent (Leonard Foerster) - Implement statistics for schemes - Avoid races between debugfs readers and writers - Reset age for only significant access frequency changes - Add kernel-doc comments in damon.h Changes from RFC v7 (https://lore.kernel.org/linux-mm/20200429124540.32232-1-sjpark@amazon.com/) - Rebase on DAMON v11 patchset - Add documentation Changes from RFC v6 (https://lore.kernel.org/linux-mm/20200407100007.3894-1-sjpark@amazon.com/) - Rebase on DAMON v9 patchset - Cleanup code and fix typos (Stefan Nuernberger) Changes from RFC v5 (https://lore.kernel.org/linux-mm/20200330115042.17431-1-sjpark@amazon.com/) - Rebase on DAMON v8 patchset - Update test results - Fix DAMON userspace tool crash on signal handling - Fix checkpatch warnings Changes from RFC v4 (https://lore.kernel.org/linux-mm/20200303121406.20954-1-sjpark@amazon.com/) - Handle CONFIG_ADVISE_SYSCALL - Clean up code (Jonathan Cameron) - Update test results - Rebase on v5.6 + DAMON v7 Changes from RFC v3 (https://lore.kernel.org/linux-mm/20200225102300.23895-1-sjpark@amazon.com/) - Add Reviewed-by from Brendan Higgins - Code cleanup: Modularize madvise() call - Fix a trivial bug in the wrapper python script - Add more stable and detailed evaluation results with updated ETHP scheme Changes from RFC v2 (https://lore.kernel.org/linux-mm/20200218085309.18346-1-sjpark@amazon.com/) - Fix aging mechanism for more better 'old region' selection - Add more kunittests and kselftests for this patchset - Support more human friedly description and application of 'schemes' Changes from RFC v1 (https://lore.kernel.org/linux-mm/20200210150921.32482-1-sjpark@amazon.com/) - Properly adjust age accounting related properties after splitting, merging, and action applying SeongJae Park (8): mm/madvise: Export do_madvise() to external GPL modules mm/damon: Account age of target regions mm/damon: Implement data access monitoring-based operation schemes mm/damon/schemes: Implement a debugfs interface mm/damon/schemes: Implement statistics feature mm/damon/selftests: Add 'schemes' debugfs tests damon/tools: Support more human friendly 'schemes' control Documentation/admin-guide/mm: Document DAMON-based operation schemes Documentation/admin-guide/mm/damon/guide.rst | 35 ++ Documentation/admin-guide/mm/damon/usage.rst | 126 +++++- include/linux/damon.h | 65 ++++ mm/damon.c | 361 +++++++++++++++++- mm/madvise.c | 1 + tools/damon/_convert_damos.py | 128 +++++++ tools/damon/_damon.py | 143 +++++++ tools/damon/damo | 7 + tools/damon/record.py | 135 +------ tools/damon/schemes.py | 105 +++++ .../testing/selftests/damon/debugfs_attrs.sh | 29 ++ 11 files changed, 992 insertions(+), 143 deletions(-) create mode 100755 tools/damon/_convert_damos.py create mode 100644 tools/damon/_damon.py create mode 100644 tools/damon/schemes.py -- 2.17.1