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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9C204C433F5 for ; Thu, 7 Apr 2022 03:17:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240164AbiDGDTz (ORCPT ); Wed, 6 Apr 2022 23:19:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240053AbiDGDSb (ORCPT ); Wed, 6 Apr 2022 23:18:31 -0400 Received: from mail-io1-xd49.google.com (mail-io1-xd49.google.com [IPv6:2607:f8b0:4864:20::d49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2FA2710783A for ; Wed, 6 Apr 2022 20:16:16 -0700 (PDT) Received: by mail-io1-xd49.google.com with SMTP id y3-20020a056602178300b00645d25c30c1so2866155iox.6 for ; Wed, 06 Apr 2022 20:16:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc:content-transfer-encoding; bh=Hk061r36fFDHPss1k4DAxA1XCB27mAOmZSEsdS/R3y0=; b=BLETQIZf0VkNw/y4oshlrwFxUKc1nfeWR7CdjoYPAlDckINOwt059px8J1lKJy1Gcu G+bA3IqbHYuSGhfCZMtOWNMTTH4s0GnJEqHXvOMkCzMwPEsQPxn3KFhYn6EIwWi9k+RA 7QXQeZKAZJ6Q3CREznWeO4tUayoUexn+t1N6LDYVeoWBz9z/ZiJ/xZI6yMuAY25pTo21 0h/Ql2gfgdKl0kDbxL7w1CMMIL68FajqOrYsfEvVsv8sEj0iJgi3Cy76ZemYMh+xDVj8 xUFSvRPFT23Es3++1b0iYmxxKe9LU47ZgotXkqgPpJzuvI2il8QQ/feUFh9ZI3M9aORm av6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc:content-transfer-encoding; bh=Hk061r36fFDHPss1k4DAxA1XCB27mAOmZSEsdS/R3y0=; b=MwKO9YFIgrSCXrrRC044QeXHosOcHjcfjYF9LG0y0KSFFhX6FFamUuKjIVGVi8bK24 0voMSwMOj13qW0l1QdpraK7hTvx40ZF0T3dN2DJXTCUjs5lEpnR/w/e/C1yWhj6WAAnJ CdsiYxG0yHhdYz7M5wUGrJs9aWbJG/eUBWeBCllRF3LFEATWsmOvPpjr5XfL8CGGFtbp xj5flz80IBwK3M29Z7YjxCNWsnGWIxHC5EguENXmH2OPabiUhdMhrbqSj68opyeWfxg2 20eEwhlYQiwffhEGlvFIuoLDvyIlSk7Ev69ws73QQgZMBjiqBPpQsUBSpnOnyIm/GrCt ouHw== X-Gm-Message-State: AOAM53101BGeAMvMM8fP8ZUOnM1ceVnoMelN0NFZO0eL+Bl8jAINWtte KOf5yejwwGIkRNBdiclvz0JM6QUCNas= X-Google-Smtp-Source: ABdhPJyKyMcZB3w6bV1VKovDqiUtwJqZgMsGAMRjNWe6tIClmStHGRyTulk2U3y9S/VDe+SXxEYxFLMC8UY= X-Received: from yuzhao.bld.corp.google.com ([2620:15c:183:200:9ea2:c755:ae22:6862]) (user=yuzhao job=sendgmr) by 2002:a02:ce91:0:b0:323:6d4a:484a with SMTP id y17-20020a02ce91000000b003236d4a484amr6422652jaq.311.1649301375950; Wed, 06 Apr 2022 20:16:15 -0700 (PDT) Date: Wed, 6 Apr 2022 21:15:25 -0600 In-Reply-To: <20220407031525.2368067-1-yuzhao@google.com> Message-Id: <20220407031525.2368067-14-yuzhao@google.com> Mime-Version: 1.0 References: <20220407031525.2368067-1-yuzhao@google.com> X-Mailer: git-send-email 2.35.1.1094.g7c7d902a7c-goog Subject: [PATCH v10 13/14] mm: multi-gen LRU: admin guide From: Yu Zhao To: Stephen Rothwell , linux-mm@kvack.org Cc: Andi Kleen , Andrew Morton , Aneesh Kumar , Barry Song <21cnbao@gmail.com>, Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Jesse Barnes , Johannes Weiner , Jonathan Corbet , Linus Torvalds , Matthew Wilcox , Mel Gorman , Michael Larabel , Michal Hocko , Mike Rapoport , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, page-reclaim@google.com, x86@kernel.org, Yu Zhao , Brian Geffon , Jan Alexander Steffens , Oleksandr Natalenko , Steven Barrett , Suleiman Souhlal , Daniel Byrne , Donald Carr , "=?UTF-8?q?Holger=20Hoffst=C3=A4tte?=" , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh , Vaibhav Jain Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add an admin guide. Signed-off-by: Yu Zhao Acked-by: Brian Geffon Acked-by: Jan Alexander Steffens (heftig) Acked-by: Oleksandr Natalenko Acked-by: Steven Barrett Acked-by: Suleiman Souhlal Tested-by: Daniel Byrne Tested-by: Donald Carr Tested-by: Holger Hoffst=C3=A4tte Tested-by: Konstantin Kharlamov Tested-by: Shuang Zhai Tested-by: Sofia Trinh Tested-by: Vaibhav Jain --- Documentation/admin-guide/mm/index.rst | 1 + Documentation/admin-guide/mm/multigen_lru.rst | 152 ++++++++++++++++++ mm/Kconfig | 3 +- 3 files changed, 155 insertions(+), 1 deletion(-) create mode 100644 Documentation/admin-guide/mm/multigen_lru.rst diff --git a/Documentation/admin-guide/mm/index.rst b/Documentation/admin-g= uide/mm/index.rst index c21b5823f126..2cf5bae62036 100644 --- a/Documentation/admin-guide/mm/index.rst +++ b/Documentation/admin-guide/mm/index.rst @@ -32,6 +32,7 @@ the Linux memory management. idle_page_tracking ksm memory-hotplug + multigen_lru nommu-mmap numa_memory_policy numaperf diff --git a/Documentation/admin-guide/mm/multigen_lru.rst b/Documentation/= admin-guide/mm/multigen_lru.rst new file mode 100644 index 000000000000..3d9a6ef84229 --- /dev/null +++ b/Documentation/admin-guide/mm/multigen_lru.rst @@ -0,0 +1,152 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Multi-Gen LRU +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +The multi-gen LRU is an alternative LRU implementation that optimizes +page reclaim and improves performance under memory pressure. Page +reclaim decides the kernel's caching policy and ability to overcommit +memory. It directly impacts the kswapd CPU usage and RAM efficiency. + +Quick start +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Build the kernel with the following configurations. + +* ``CONFIG_LRU_GEN=3Dy`` +* ``CONFIG_LRU_GEN_ENABLED=3Dy`` + +All set! + +Runtime options +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +``/sys/kernel/mm/lru_gen/`` contains stable ABIs described in the +following subsections. + +Kill switch +----------- +``enable`` accepts different values to enable or disable the following +components. Its default value depends on ``CONFIG_LRU_GEN_ENABLED``. +All the components should be enabled unless some of them have +unforeseen side effects. Writing to ``enable`` has no effect when a +component is not supported by the hardware, and valid values will be +accepted even when the main switch is off. + +=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +Values Components +=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +0x0001 The main switch for the multi-gen LRU. +0x0002 Clearing the accessed bit in leaf page table entries in large + batches, when MMU sets it (e.g., on x86). This behavior can + theoretically worsen lock contention (mmap_lock). If it is + disabled, the multi-gen LRU will suffer a minor performance + degradation. +0x0004 Clearing the accessed bit in non-leaf page table entries as + well, when MMU sets it (e.g., on x86). This behavior was not + verified on x86 varieties other than Intel and AMD. If it is + disabled, the multi-gen LRU will suffer a negligible + performance degradation. +[yYnN] Apply to all the components above. +=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +E.g., +:: + + echo y >/sys/kernel/mm/lru_gen/enabled + cat /sys/kernel/mm/lru_gen/enabled + 0x0007 + echo 5 >/sys/kernel/mm/lru_gen/enabled + cat /sys/kernel/mm/lru_gen/enabled + 0x0005 + +Thrashing prevention +-------------------- +Personal computers are more sensitive to thrashing because it can +cause janks (lags when rendering UI) and negatively impact user +experience. The multi-gen LRU offers thrashing prevention to the +majority of laptop and desktop users who do not have ``oomd``. + +Users can write ``N`` to ``min_ttl_ms`` to prevent the working set of +``N`` milliseconds from getting evicted. The OOM killer is triggered +if this working set cannot be kept in memory. In other words, this +option works as an adjustable pressure relief valve, and when open, it +terminates applications that are hopefully not being used. + +Based on the average human detectable lag (~100ms), ``N=3D1000`` usually +eliminates intolerable janks due to thrashing. Larger values like +``N=3D3000`` make janks less noticeable at the risk of premature OOM +kills. + +The default value ``0`` means disabled. + +Experimental features +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D +``/sys/kernel/debug/lru_gen`` accepts commands described in the +following subsections. Multiple command lines are supported, so does +concatenation with delimiters ``,`` and ``;``. + +``/sys/kernel/debug/lru_gen_full`` provides additional stats for +debugging. ``CONFIG_LRU_GEN_STATS=3Dy`` keeps historical stats from +evicted generations in this file. + +Working set estimation +---------------------- +Working set estimation measures how much memory an application +requires in a given time interval, and it is usually done with little +impact on the performance of the application. E.g., data centers want +to optimize job scheduling (bin packing) to improve memory +utilizations. When a new job comes in, the job scheduler needs to find +out whether each server it manages can allocate a certain amount of +memory for this new job before it can pick a candidate. To do so, this +job scheduler needs to estimate the working sets of the existing jobs. + +When it is read, ``lru_gen`` returns a histogram of numbers of pages +accessed over different time intervals for each memcg and node. +``MAX_NR_GENS`` decides the number of bins for each histogram. +:: + + memcg memcg_id memcg_path + node node_id + min_gen_nr age_in_ms nr_anon_pages nr_file_pages + ... + max_gen_nr age_in_ms nr_anon_pages nr_file_pages + +Each generation contains an estimated number of pages that have been +accessed within ``age_in_ms`` non-cumulatively. E.g., ``min_gen_nr`` +contains the coldest pages and ``max_gen_nr`` contains the hottest +pages, since ``age_in_ms`` of the former is the largest and that of +the latter is the smallest. + +Users can write ``+ memcg_id node_id max_gen_nr +[can_swap[full_scan]]`` to ``lru_gen`` to create a new generation +``max_gen_nr+1``. ``can_swap`` defaults to the swap setting and, if it +is set to ``1``, it forces the scan of anon pages when swap is off. +``full_scan`` defaults to ``1`` and, if it is set to ``0``, it reduces +the overhead as well as the coverage when scanning page tables. + +A typical use case is that a job scheduler writes to ``lru_gen`` at a +certain time interval to create new generations, and it ranks the +servers it manages based on the sizes of their cold memory defined by +this time interval. + +Proactive reclaim +----------------- +Proactive reclaim induces memory reclaim when there is no memory +pressure and usually targets cold memory only. E.g., when a new job +comes in, the job scheduler wants to proactively reclaim memory on the +server it has selected to improve the chance of successfully landing +this new job. + +Users can write ``- memcg_id node_id min_gen_nr [swappiness +[nr_to_reclaim]]`` to ``lru_gen`` to evict generations less than or +equal to ``min_gen_nr``. Note that ``min_gen_nr`` should be less than +``max_gen_nr-1`` as ``max_gen_nr`` and ``max_gen_nr-1`` are not fully +aged and therefore cannot be evicted. ``swappiness`` overrides the +default value in ``/proc/sys/vm/swappiness``. ``nr_to_reclaim`` limits +the number of pages to evict. + +A typical use case is that a job scheduler writes to ``lru_gen`` +before it tries to land a new job on a server, and if it fails to +materialize the cold memory without impacting the existing jobs on +this server, it retries on the next server according to the ranking +result obtained from the working set estimation step described +earlier. diff --git a/mm/Kconfig b/mm/Kconfig index b55546191369..2fb9d5efcf89 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -916,7 +916,8 @@ config LRU_GEN # the following options can use up the spare bits in page flags depends on !MAXSMP && (64BIT || !SPARSEMEM || SPARSEMEM_VMEMMAP) help - A high performance LRU implementation to overcommit memory. + A high performance LRU implementation to overcommit memory. See + Documentation/admin-guide/mm/multigen_lru.rst for details. =20 config LRU_GEN_ENABLED bool "Enable by default" --=20 2.35.1.1094.g7c7d902a7c-goog 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D951EC433EF for ; Thu, 7 Apr 2022 03:40:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:References: Mime-Version:Message-Id:In-Reply-To:Date:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc 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13/14] mm: multi-gen LRU: admin guide From: Yu Zhao To: Stephen Rothwell , linux-mm@kvack.org Cc: Andi Kleen , Andrew Morton , Aneesh Kumar , Barry Song <21cnbao@gmail.com>, Catalin Marinas , Dave Hansen , Hillf Danton , Jens Axboe , Jesse Barnes , Johannes Weiner , Jonathan Corbet , Linus Torvalds , Matthew Wilcox , Mel Gorman , Michael Larabel , Michal Hocko , Mike Rapoport , Rik van Riel , Vlastimil Babka , Will Deacon , Ying Huang , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, page-reclaim@google.com, x86@kernel.org, Yu Zhao , Brian Geffon , Jan Alexander Steffens , Oleksandr Natalenko , Steven Barrett , Suleiman Souhlal , Daniel Byrne , Donald Carr , "=?UTF-8?q?Holger=20Hoffst=C3=A4tte?=" , Konstantin Kharlamov , Shuang Zhai , Sofia Trinh , Vaibhav Jain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220406_201619_070492_6A908889 X-CRM114-Status: GOOD ( 26.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org QWRkIGFuIGFkbWluIGd1aWRlLgoKU2lnbmVkLW9mZi1ieTogWXUgWmhhbyA8eXV6aGFvQGdvb2ds ZS5jb20+CkFja2VkLWJ5OiBCcmlhbiBHZWZmb24gPGJnZWZmb25AZ29vZ2xlLmNvbT4KQWNrZWQt Ynk6IEphbiBBbGV4YW5kZXIgU3RlZmZlbnMgKGhlZnRpZykgPGhlZnRpZ0BhcmNobGludXgub3Jn PgpBY2tlZC1ieTogT2xla3NhbmRyIE5hdGFsZW5rbyA8b2xla3NhbmRyQG5hdGFsZW5rby5uYW1l PgpBY2tlZC1ieTogU3RldmVuIEJhcnJldHQgPHN0ZXZlbkBsaXF1b3JpeC5uZXQ+CkFja2VkLWJ5 OiBTdWxlaW1hbiBTb3VobGFsIDxzdWxlaW1hbkBnb29nbGUuY29tPgpUZXN0ZWQtYnk6IERhbmll bCBCeXJuZSA8ZGpieXJuZUBtdHUuZWR1PgpUZXN0ZWQtYnk6IERvbmFsZCBDYXJyIDxkQGNoYW9z LXJlaW5zLmNvbT4KVGVzdGVkLWJ5OiBIb2xnZXIgSG9mZnN0w6R0dGUgPGhvbGdlckBhcHBsaWVk 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