From nobody Tue Apr 14 14:05:39 2026 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 397E12E8B81; Tue, 14 Apr 2026 04:52:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776142379; cv=none; b=sbFFNWjFxjwIxmiQyWxs/P2H13UBcUUPQcf2Gu36W5vc8ZrTas2ncxDJ22svpcCmPNFfLRFlb2ooC3jojHewvWnFDT7u0s8OaQqDtHKYyEccLhyjQ2GPymsIfCChk06VPOnk5Yh0DK8iEMrl2fj5WdEtHyqAUIy16OlFU1rnwgk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776142379; c=relaxed/simple; bh=c+5+KIyLfb5AgagNq7OxOOjGMcrikTwsTu2i1IKcfP4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e7FMIuSv0+H7O5Gqkj9MDJTtoopWoDcH68Z3mli5bdhUBNpehm0rew2YpVoNy+vlCg7MuxJ+oLrs33pbUmXQeIcI8GMJ1N/6wQPeIpGeSo/kpnizSN/RQWwxp7xOSC45PH/yeSIUhFRJzJBbOVn5bvsUyNFUGO+Udiobzm4tW5Y= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cjzcbpiW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cjzcbpiW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B6A79C2BCB9; Tue, 14 Apr 2026 04:52:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776142378; bh=c+5+KIyLfb5AgagNq7OxOOjGMcrikTwsTu2i1IKcfP4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cjzcbpiWnH2uB65rdaigC0+FBemAa4PWf3Twx+UyfL0pEA+MpPRB5kAHEAC/EVABJ 1NdlXi0gIrok93+fmpQYUgKyuOM0jNIsEDsQ2be/u+oJmrbjudwHgepgOuR2Q4DhvH tngVuyVrhJ7mkLZHSZZFvXz23MyTaQvN1pl+Rv7tD+ZVSzYcZN9nPojWoOQfACZN8o dNOWGyLec/7oBxc78lCvdEWiUMrlGWdHHB1dSIMo+4+auSHXTXayT4Dz5OPTeZc4ic RP1zbawdqaow3vc6+3GigiP+YWIssR+GGsTM7tEMxfhYLDddW3Trl749pyECcT4tuZ q4GHYHXqK/kEQ== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 1/2] mm/damon/reclaim: add autotune_monitoring_intervals parameter Date: Mon, 13 Apr 2026 21:52:50 -0700 Message-ID: <20260414045253.88529-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260414045253.88529-1-sj@kernel.org> References: <20260414045253.88529-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" DAMON's monitoring intervals auto-tuning feature has proven to be useful in multiple environments. DAMON_RECLAIM is still asking users to do the manual tuning of the intervals. Add a module parameter for utilizing the auto-tuning feature with the suggested default setup. Signed-off-by: SeongJae Park --- mm/damon/reclaim.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c index 4fc4a54b5e546..89998d28628c4 100644 --- a/mm/damon/reclaim.c +++ b/mm/damon/reclaim.c @@ -91,6 +91,20 @@ module_param(quota_mem_pressure_us, ulong, 0600); static unsigned long quota_autotune_feedback __read_mostly; module_param(quota_autotune_feedback, ulong, 0600); =20 +/* + * Auto-tune monitoring intervals. + * + * If this parameter is set as ``Y``, DAMON_RECLAIM automatically tunes DA= MON's + * sampling and aggregation intervals. The auto-tuning aims to capture + * meaningful amount of access events in each DAMON-snapshot, while keepin= g the + * sampling intervals 5 milliseconds in minimum, and 10 seconds in maximum. + * Setting this as ``N`` disables the auto-tuning. + * + * Disabled by default. + */ +static bool autotune_monitoring_intervals __read_mostly; +module_param(autotune_monitoring_intervals, bool, 0600); + static struct damos_watermarks damon_reclaim_wmarks =3D { .metric =3D DAMOS_WMARK_FREE_MEM_RATE, .interval =3D 5000000, /* 5 seconds */ @@ -159,7 +173,7 @@ DEFINE_DAMON_MODULES_DAMOS_STATS_PARAMS(damon_reclaim_s= tat, static struct damon_ctx *ctx; static struct damon_target *target; =20 -static struct damos *damon_reclaim_new_scheme(void) +static struct damos *damon_reclaim_new_scheme(unsigned long aggr_interval) { struct damos_access_pattern pattern =3D { /* Find regions having PAGE_SIZE or larger size */ @@ -169,8 +183,7 @@ static struct damos *damon_reclaim_new_scheme(void) .min_nr_accesses =3D 0, .max_nr_accesses =3D 0, /* for min_age or more micro-seconds */ - .min_age_region =3D min_age / - damon_reclaim_mon_attrs.aggr_interval, + .min_age_region =3D min_age / aggr_interval, .max_age_region =3D UINT_MAX, }; =20 @@ -191,6 +204,7 @@ static int damon_reclaim_apply_parameters(void) { struct damon_ctx *param_ctx; struct damon_target *param_target; + struct damon_attrs attrs; struct damos *scheme; struct damos_quota_goal *goal; struct damos_filter *filter; @@ -208,12 +222,21 @@ static int damon_reclaim_apply_parameters(void) goto out; } =20 - err =3D damon_set_attrs(param_ctx, &damon_reclaim_mon_attrs); + attrs =3D damon_reclaim_mon_attrs; + if (autotune_monitoring_intervals) { + attrs.sample_interval =3D 5000; + attrs.aggr_interval =3D 100000; + attrs.intervals_goal.access_bp =3D 40; + attrs.intervals_goal.aggrs =3D 3; + attrs.intervals_goal.min_sample_us =3D 5000; + attrs.intervals_goal.max_sample_us =3D 10 * 1000 * 1000; + } + err =3D damon_set_attrs(param_ctx, &attrs); if (err) goto out; =20 err =3D -ENOMEM; - scheme =3D damon_reclaim_new_scheme(); + scheme =3D damon_reclaim_new_scheme(attrs.aggr_interval); if (!scheme) goto out; damon_set_schemes(param_ctx, &scheme, 1); --=20 2.47.3 From nobody Tue Apr 14 14:05:39 2026 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 AFD2B2FD1CA; Tue, 14 Apr 2026 04:52:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776142379; cv=none; b=kRp5GDgLyvtRK190yv/O0UlfDO8fhCE/Hd5Ja6gxiH9r1g20/P1fKFvgzfzLMAmW5coREt+it4MCdIYUm+V/xZcFjFy2fTl/y25L6eiHjE11F24BYaWnMeqng3cXk0ly/tgY4chDxixUEicojV3TUeEU1QyLWA1rvfoyVT2sdjQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776142379; c=relaxed/simple; bh=BfEEDyBrJIkd6+k5rVK7zBS2eb2FwO/Rw5l0AYJHr24=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JzYzKCX7SF5gmcE1ewGaU0U03vQ4v09PjhBPaJi+ULTeYbUFwNjL8ZSmAe+YHIPnw00FH54y7F9kkbNA3RgG0fJsKzUSi/7TD0rOF+SAwtz+GrK8SvZMlgyxx2qRKkllxtS12wdqG+OOWWDKatJSTsItepvOhklPMkuUyX7q5PM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V5JKgRLR; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V5JKgRLR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 13F5BC19425; Tue, 14 Apr 2026 04:52:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776142379; bh=BfEEDyBrJIkd6+k5rVK7zBS2eb2FwO/Rw5l0AYJHr24=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V5JKgRLRaK3TD/B3m5VhTQVcUENur1AMCIFZLkTVFmPS3sDwrdzLFRGQaEUFr4Umg 2dWFhSKCobfoSt1PEVryBL9RbBKWAFpcHjfU5uNI5jm85OyDj42RDOhbYjkJ3fplr7 iLbmb9phIs3VYY039eGwFOUYb53+JCLF06JToEf6Q1bwhw8XjfvQKZYGqJxo7ocCJY qIdTxinBXRflpf+dAE4FG06nab3iXavRwuZz4qZpA+MhIbrIyL8ZLDZpV3Uy1m07i9 da4a+J9BRroAPQYrUicrAHjAYL7ffsEu8BBVkixKWf6Lz9h/wOpn/mhgAtYrLPbgB0 jXbP4R7oA/nSw== From: SeongJae Park To: Cc: SeongJae Park , "Liam R. Howlett" , Andrew Morton , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 2/2] Docs/admin-guide/mm/damon/reclaim: update for autotune_monitoring_intervals Date: Mon, 13 Apr 2026 21:52:51 -0700 Message-ID: <20260414045253.88529-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260414045253.88529-1-sj@kernel.org> References: <20260414045253.88529-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Update DAMON_RECLAIM usage document for the newly added monitoring intervals auto-tuning enablement parameter. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/reclaim.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/admin-guide/mm/damon/reclaim.rst b/Documentation= /admin-guide/mm/damon/reclaim.rst index 01a34c215b66f..b14a065586271 100644 --- a/Documentation/admin-guide/mm/damon/reclaim.rst +++ b/Documentation/admin-guide/mm/damon/reclaim.rst @@ -85,6 +85,17 @@ identifies the region as cold, and reclaims it. =20 120 seconds by default. =20 +autotune_monitoring_intervals +----------------------------- + +If this parameter is set as ``Y``, DAMON_RECLAIM automatically tunes DAMON= 's +sampling and aggregation intervals. The auto-tuning aims to capture meani= ngful +amount of access events in each DAMON-snapshot, while keeping the sampling +interval 5 milliseconds in minimum, and 10 seconds in maximum. Setting th= is as +``N`` disables the auto-tuning. + +Disabled by default. + quota_ms -------- =20 --=20 2.47.3