From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6CDA479E9 for ; Thu, 24 Nov 2022 21:21:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0906C43145; Thu, 24 Nov 2022 21:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669324881; bh=grt8f69Dz6AwyetZSMeMbFhewde1iaVMzadAT1LoRZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Scsna3COmwE6eGQjmyTlyjMBdHtCfsQzO5q1w/q8qp13kHeVLM7pYbq/hp9VTIvZ8 oeAq5Z4EryN0E8hwqg7wWWL1yCKYXc6Sx7c5qQOgw8qPvFUd0fYn2CR/0gb0nqE996 uv6/Ohyk8hja+94/N/7kXEdJVPkHFh8L4SNkSOG3vMKzBz+hGjxp33tPXRzvIiS37R hsAQFUCu1bE5lUpUt2KOZDM7wOX9x5xe5YvKgnVXWyiErEdkblKhL3siXJ1330TFuy JFhOYoDstdrsx5xYZTQhVJcTuPUxrNfXrJ8qjRnXPyEaXem/Rt6kFQiL66Bp/7ybkJ BJndOwSLhj+0g== From: SeongJae Park To: Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [RFC PATCH 03/11] mm/damon/reclaim: add a parameter called skip_anon for avoiding anonymous pages reclamation Date: Thu, 24 Nov 2022 21:21:06 +0000 Message-Id: <20221124212114.136863-4-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221124212114.136863-1-sj@kernel.org> References: <20221124212114.136863-1-sj@kernel.org> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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, -- 2.25.1