From patchwork Wed Nov 30 20:09:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 13060351 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]) by smtp.lore.kernel.org (Postfix) with ESMTP id EECBAC352A1 for ; Wed, 30 Nov 2022 20:09:51 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C34476B0078; Wed, 30 Nov 2022 15:09:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id B98126B007E; Wed, 30 Nov 2022 15:09:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 88FE36B0081; Wed, 30 Nov 2022 15:09:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 6E9916B0078 for ; Wed, 30 Nov 2022 15:09:47 -0500 (EST) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id B448616116F for ; Wed, 30 Nov 2022 20:09:46 +0000 (UTC) X-FDA: 80191199172.15.569273B Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf05.hostedemail.com (Postfix) with ESMTP id 0E5EF100002 for ; Wed, 30 Nov 2022 20:09:45 +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 ams.source.kernel.org (Postfix) with ESMTPS id 85D8FB81CD5; Wed, 30 Nov 2022 20:09:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4E89C43146; Wed, 30 Nov 2022 20:09:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838983; bh=grt8f69Dz6AwyetZSMeMbFhewde1iaVMzadAT1LoRZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WLNVlXze66e6bJgKZEGO6XI9qKr/WWkt6nkzk1TBS/Zp1Ly0AijwDHo+ze1hiwAg8 IWldWCPVTjtow7pGt00n5zCRRKElawSyBxP+MSy8AZp7EjmkPhMyQa9tfE9qrQYQ8Y 5ERqWfkAUyirqLxgMNPSQ3kmrgyMEIrq9Qm7aJDQUiXLJQEI52w1/f21B2soeQUYtN OWALqy4zpatDyFmHUrVLOiWSqokxBiwwl0NylXbV4md41gQpUegL7x6yQswbiK2ZtB 8Zw46mBgzM5M42g+RpWukjcjOMYjgsei/DCOxhSOHXGQfogoPE724ciYkfcZladH5+ kdqd1DsjoGUWg== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 03/11] mm/damon/reclaim: add a parameter called skip_anon for avoiding anonymous pages reclamation Date: Wed, 30 Nov 2022 20:09:29 +0000 Message-Id: <20221130200937.118005-4-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669838986; a=rsa-sha256; cv=none; b=zLFfLTGff1ew9Ul3le6r3hMpOhpNSEoX8/qUXILTxkU0PC9mEataSkmF2mbQnKZGfLoHfC qTIFexjSSGFSVgxDoJnQs3wCaRyhXPlHBvvAEOW/Nj/mC8JVo1IFOCeIb7f0i6HCCcSjAE YQGrArnPFXk+KofE+9R676Wk9OObjFw= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WLNVlXze; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf05.hostedemail.com: domain of sj@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=sj@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669838986; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=r3xyNreIJtEHO9foiiQtvJVmPt1q36n0JQLVr8U6gzI=; b=sQTE5GhGPQoXlk1EJAI2Vn+yR71JliOQK4jEYileJL8MOInjx1VVhSmxbxov8GuOxV/HxJ 0EJGZPpV+KM+oA+wxq4bs/hyYWUvJWBC4ag8LsaNnJCz/hUCnBAfl95wv8+TICUNx/8SPg 5FMwpJ/CSGvq4ppolmtG+koUYpFnkKk= X-Rspamd-Queue-Id: 0E5EF100002 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WLNVlXze; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf05.hostedemail.com: domain of sj@kernel.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=sj@kernel.org X-Rspamd-Server: rspam12 X-Rspam-User: X-Stat-Signature: mrrd75934ahmjurjfuod938ouo3z8anu X-HE-Tag: 1669838985-167821 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: In some cases, for example if users have confidence at anonymous pages management or the swap device is too slow, users would want to avoid DAMON_RECLAIM swapping the anonymous pages out. For such case, add yet another DAMON_RECLAIM parameter, namely 'skip_anon'. When it is set as 'Y', DAMON_RECLAIM will avoid reclaiming anonymous pages using a DAMOS filter. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index e82631f39481..648d2a85523a 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -98,6 +98,15 @@ module_param(monitor_region_start, ulong, 0600); static unsigned long monitor_region_end __read_mostly; module_param(monitor_region_end, ulong, 0600); +/* + * Skip anonymous pages reclamation. + * + * If this parameter is set as ``Y``, DAMON_RECLAIM does not reclaim anonymous + * pages. By default, ``N``. + */ +static bool skip_anon __read_mostly; +module_param(skip_anon, bool, 0600); + /* * PID of the DAMON thread * @@ -142,6 +151,7 @@ static struct damos *damon_reclaim_new_scheme(void) static int damon_reclaim_apply_parameters(void) { struct damos *scheme; + struct damos_filter *filter; int err = 0; err = damon_set_attrs(ctx, &damon_reclaim_mon_attrs); @@ -152,6 +162,15 @@ static int damon_reclaim_apply_parameters(void) scheme = damon_reclaim_new_scheme(); if (!scheme) return -ENOMEM; + if (skip_anon) { + filter = damos_new_filter(DAMOS_FILTER_TYPE_ANON, true); + if (!filter) { + /* Will be freed by next 'damon_set_schemes()' below */ + damon_destroy_scheme(scheme); + return -ENOMEM; + } + damos_add_filter(scheme, filter); + } damon_set_schemes(ctx, &scheme, 1); return damon_set_region_biggest_system_ram_default(target,