From nobody Mon Mar 16 22:25:51 2026 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 49923C352A1 for ; Wed, 30 Nov 2022 20:10:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229879AbiK3UKA (ORCPT ); Wed, 30 Nov 2022 15:10:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43708 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229816AbiK3UJq (ORCPT ); Wed, 30 Nov 2022 15:09:46 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DCCD88C6A1 for ; Wed, 30 Nov 2022 12:09:45 -0800 (PST) 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 8681CB81CD9 for ; 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 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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); =20 +/* + * Skip anonymous pages reclamation. + * + * If this parameter is set as ``Y``, DAMON_RECLAIM does not reclaim anony= mous + * 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 =3D 0; =20 err =3D damon_set_attrs(ctx, &damon_reclaim_mon_attrs); @@ -152,6 +162,15 @@ static int damon_reclaim_apply_parameters(void) scheme =3D damon_reclaim_new_scheme(); if (!scheme) return -ENOMEM; + if (skip_anon) { + filter =3D 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); =20 return damon_set_region_biggest_system_ram_default(target, --=20 2.25.1