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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C7B21C433FE for ; Thu, 11 Nov 2021 04:15:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6964A6162E for ; Thu, 11 Nov 2021 04:15:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6964A6162E Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id EB2356B00BD; Wed, 10 Nov 2021 23:15:29 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E3C5B6B00BF; Wed, 10 Nov 2021 23:15:29 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CB1CF6B00C0; Wed, 10 Nov 2021 23:15:29 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0141.hostedemail.com [216.40.44.141]) by kanga.kvack.org (Postfix) with ESMTP id B93B46B00BD for ; Wed, 10 Nov 2021 23:15:29 -0500 (EST) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 7D20B81A40A6 for ; Thu, 11 Nov 2021 04:15:29 +0000 (UTC) X-FDA: 78795335136.27.6C68A43 Received: from mail-yb1-f201.google.com (mail-yb1-f201.google.com [209.85.219.201]) by imf19.hostedemail.com (Postfix) with ESMTP id 46805B0000BA for ; Thu, 11 Nov 2021 04:15:20 +0000 (UTC) Received: by mail-yb1-f201.google.com with SMTP id d8-20020a253608000000b005c202405f52so7527087yba.7 for ; Wed, 10 Nov 2021 20:15:28 -0800 (PST) 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; bh=kIC1LMcPIHE6ohL1Kwjd6ilZ7X8GMiNaA5GrQJ5M6q4=; b=DSZDX2TS+IiqWyINEcziE2ZPMV4wgH5I2PBc0aBvEMA0s5evl6R+qAyN7ZJehvxAq9 bfS9VzJK7jBYgQ5pT/IRcjC+HWzlCJqn0Ky7+mISN5WTc8LvtGIdIAooird63y4SYnzd l8BFUmYGCao2goH7hiiIncaE9NsFCr2Xv5+JS42Fx8Bw3FIMTje+p+g7cN0GxFaOstPw NpREzvq2mLPcCxwH7v9kz0BnHH0LH17/ArmHjq4AyaX+z1ppg7fWOPA+46LaHJlctiH2 ITak0prmcS3w4p8UJ0HM55jWVlGzIlI8icJ9Q0luh16+c9JI9z50nxe95dDCx9VPzbI0 CF9A== 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; bh=kIC1LMcPIHE6ohL1Kwjd6ilZ7X8GMiNaA5GrQJ5M6q4=; b=4tEAgEINSg5IJcmk5qKB/Z4WhEEqdaNNJUxar636Gx9tIpKjQGAsB3Mb0wrJVTdSw1 gbRpjyYrVZxTpRVfvyQTjZHFdtTBrOyvImPaYBgTSAWKFQDoxk/OEcmTaqfl2Tl0gubu qD+nHNV/6UeB+9TWegafoJNWwxUGDmENLMtmF6WfzdGW9xwJWOvFrJUpxX8RWamqWhWh uKpwsgtSqy191Lis5o0ov4CtOdOjsUxAS6VWiOk+8YH3XHagMxCDHEYfvoakkw5QVcPn UoX5W45OHgjxutnuK7ZdehkQVuKe8XbA1+yUdJ3q5hA01lhBxRRlsOxxTsCf/oBeHF6f zkCQ== X-Gm-Message-State: AOAM5304K7dpAVZGJS9ASm7/70qOVNwvAGhsq3RsCESD2NPR85S2IbRp dCoPt1K/n6sRowPPy5hFda9XBh1d77EpWLw88uBsHC6YVMebKQF3qGBQRPImckMt4QdCZJGbqS+ 2nNQx8jyMqQ9LWTdDDPHEZjfPemERZsk4BjhmteJjnKrpQ1bZnFf1mGSl X-Google-Smtp-Source: ABdhPJz92Zjq3t52xmpJLjYhav+djnH4c5unlUZlbCxpx8Nb7FEsbdwUxBg+ssTaG7ws2vXelVoynsmiSdQ= X-Received: from yuzhao.bld.corp.google.com ([2620:15c:183:200:346b:bb72:659e:f91c]) (user=yuzhao job=sendgmr) by 2002:a25:ade0:: with SMTP id d32mr5133433ybe.510.1636604128314; Wed, 10 Nov 2021 20:15:28 -0800 (PST) Date: Wed, 10 Nov 2021 21:15:09 -0700 In-Reply-To: <20211111041510.402534-1-yuzhao@google.com> Message-Id: <20211111041510.402534-10-yuzhao@google.com> Mime-Version: 1.0 References: <20211111041510.402534-1-yuzhao@google.com> X-Mailer: git-send-email 2.34.0.rc0.344.g81b53c2807-goog Subject: [PATCH v5 09/10] mm: multigenerational lru: Kconfig From: Yu Zhao To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, page-reclaim@google.com, holger@applied-asynchrony.com, iam@valdikss.org.ru, Yu Zhao , Konstantin Kharlamov Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 46805B0000BA X-Stat-Signature: uqt1iocia5m599siweon3j1jmn4t4syh Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=DSZDX2TS; spf=pass (imf19.hostedemail.com: domain of 34JiMYQYKCFcNJO6zD5DD5A3.1DBA7CJM-BB9Kz19.DG5@flex--yuzhao.bounces.google.com designates 209.85.219.201 as permitted sender) smtp.mailfrom=34JiMYQYKCFcNJO6zD5DD5A3.1DBA7CJM-BB9Kz19.DG5@flex--yuzhao.bounces.google.com; dmarc=pass (policy=reject) header.from=google.com X-HE-Tag: 1636604120-577333 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: Add configuration options for the multigenerational lru. Signed-off-by: Yu Zhao Tested-by: Konstantin Kharlamov --- mm/Kconfig | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/mm/Kconfig b/mm/Kconfig index d16ba9249bc5..48e7babb22e5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -896,4 +896,63 @@ config SECRETMEM source "mm/damon/Kconfig" +# the multigenerational lru { +config LRU_GEN + bool "Multigenerational LRU" + depends on MMU + # the following options may leave not enough spare bits in page->flags + depends on !MAXSMP && (64BIT || !SPARSEMEM || SPARSEMEM_VMEMMAP) + help + A high performance LRU implementation to heavily overcommit workloads + that are not IO bound. See Documentation/vm/multigen_lru.rst for + details. + + Warning: do not enable this option unless you plan to use it because + it introduces a small per-process and per-memcg and per-node memory + overhead. + +config LRU_GEN_ENABLED + bool "Turn on by default" + depends on LRU_GEN + help + The default value of /sys/kernel/mm/lru_gen/enabled is 0. This option + changes it to 1. + + Warning: the default value is the fast path. See + Documentation/static-keys.txt for details. + +config LRU_GEN_STATS + bool "Full stats for debugging" + depends on LRU_GEN + help + This option keeps full stats for each generation, which can be read + from /sys/kernel/debug/lru_gen_full. + + Warning: do not enable this option unless you plan to use it because + it introduces an additional small per-process and per-memcg and + per-node memory overhead. + +config NR_LRU_GENS + int "Max number of generations" + depends on LRU_GEN + range 4 31 + default 7 + help + This will use order_base_2(N+1) spare bits from page flags. + + Warning: do not use numbers larger than necessary because each + generation introduces a small per-node and per-memcg memory overhead. + +config TIERS_PER_GEN + int "Number of tiers per generation" + depends on LRU_GEN + range 2 5 + default 4 + help + This will use N-2 spare bits from page flags. + + Larger values generally offer better protection to active pages under + heavy buffered I/O workloads. +# } + endmenu -- 2.34.0.rc0.344.g81b53c2807-goog