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Mon, 5 Dec 2022 23:08:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A9C9C43146; Mon, 5 Dec 2022 23:08:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1670281717; bh=grt8f69Dz6AwyetZSMeMbFhewde1iaVMzadAT1LoRZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Gkd9ZtOBsrsbXnQFw9/sbyQbOH93AK/MO5lZXVdWN9g0ZWQ8gEIX08NSzEl2o7mnd lEZcmZgk03/Bb1cA8Se81GMDzpz1rpO4pSs3dXeVGR3586qFm0ua28x7yTZUsiP1Jw XohFGfEmlDPWRNb7mRez4As0YcnWL2GTA6oEzH0/r13j4H0S6fl286ORTXbb9xxln0 BylJ/JsgTIFq56cYSPF0JSx3FT2kNU+ZCefodS0dcW3vGVzIo0UWtL/hj1a6NmFXhH jxei4CFDcvbTrIf+gco38m0sYnHgXATXdCmuX5WZyuV+UuBXuFRzw1X90uFhiu8G6H jlVIbQEwM991A== From: SeongJae Park To: Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [PATCH 03/11] mm/damon/reclaim: add a parameter called skip_anon for avoiding anonymous pages reclamation Date: Mon, 5 Dec 2022 23:08:22 +0000 Message-Id: <20221205230830.144349-4-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221205230830.144349-1-sj@kernel.org> References: <20221205230830.144349-1-sj@kernel.org> MIME-Version: 1.0 X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 307E418000F X-Rspam-User: X-Stat-Signature: on3ptejoii484gtmqtcrrm8od9eg73qo X-Spamd-Result: default: False [2.90 / 9.00]; BAYES_HAM(-3.70)[94.14%]; R_MISSING_CHARSET(2.50)[]; IRL_BL_25(2.00)[52.25.139.140:received]; MID_CONTAINS_FROM(1.00)[]; SUBJECT_HAS_UNDERSCORES(1.00)[]; MIME_GOOD(-0.10)[text/plain]; BAD_REP_POLICIES(0.10)[]; RCVD_NO_TLS_LAST(0.10)[]; MIME_TRACE(0.00)[0:+]; DKIM_TRACE(0.00)[kernel.org:+]; DMARC_POLICY_ALLOW(0.00)[kernel.org,none]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; ARC_SIGNED(0.00)[hostedemail.com:s=arc-20220608:i=1]; ARC_NA(0.00)[]; R_DKIM_ALLOW(0.00)[kernel.org:s=k20201202]; RCVD_COUNT_THREE(0.00)[3]; FROM_HAS_DN(0.00)[]; R_SPF_ALLOW(0.00)[+a:dfw.source.kernel.org]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[] X-HE-Tag: 1670281718-243410 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,