From nobody Thu Apr 9 10:29:05 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 A6D5A2E9730; Tue, 10 Mar 2026 01:05:40 +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=1773104740; cv=none; b=rqFP4bRs5SBTo8foGATfrHTaiEYOWM1G3bTgO4JTe4EZagfLtgiRzjshsimpBnC2zQ8Mwhw6brTsPjQgpUHhHbkmQ4wmI+JNTdRMs6RPC1PfG2YfzFOrXmy7lSdEW4iktwWiJGJO/jUcXwIRVU/vif08+TzErai6bvYzsNPbw9w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773104740; c=relaxed/simple; bh=8g5RM84PzzTOH9XhkrAPhPyfvWGkJhpn6rsV5ukGTjU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KiZu7cSZJi3QJuQz+X/8konwTMf3zpPeqpgBub8PSv95m2f1omxP5VXS7IUStz17AbUh2aG1x/2iX5hmh9OgUQmr3p3weGGISbiyhWaHCH7PbgT7zYt0hs6P4qqsXW6UPJUGvnTVIf7kYJ21BNdOFm2rr6j7k8qcPU5K9p6oO1Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gBwjHDJb; 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="gBwjHDJb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21F16C2BCB0; Tue, 10 Mar 2026 01:05:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773104740; bh=8g5RM84PzzTOH9XhkrAPhPyfvWGkJhpn6rsV5ukGTjU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gBwjHDJb5FNMs4+6fg//+BneuH8gokx0udvi/q2s3S9GwqombT+uPVubEw41mquHE UuxckTAdvSweLAQLwEUFz5Ryfw6r0J3YtrYe6dR3C9GSzp1EbGMaTIBNtKUS90y/wa /X4w8R210/TNxc1imAGaUtgPWt4VkMELhjnNx+spUf/N0CWxP5mez3pGE7o63VHpsx TQRXaUY2jRdnYMoNYStNFqNCI2bRb5vQteR3qBhrUoHXnQdoh/CK8yY7lnAaJy2PAn p1G9XxX2JdLXPjRQoFBxyurqvS9jXtpTn+gXn4EhdDl5cLfyWweNFv1TOEY7c7iHM/ 3/l4Cc3Avg+NA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , "Liam R. Howlett" , 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: [PATCH 06/11] Docs/admin-guide/mm/damon/usage: document goal_tuner sysfs file Date: Mon, 9 Mar 2026 18:05:22 -0700 Message-ID: <20260310010529.91162-7-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260310010529.91162-1-sj@kernel.org> References: <20260310010529.91162-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Update the DAMON usage document for the new sysfs file for the goal based quota auto-tuning algorithm selection. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/a= dmin-guide/mm/damon/usage.rst index b0f3969b6b3b1..534e1199cf091 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -83,7 +83,7 @@ comma (","). =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 sz/min,max =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 nr_accesses/min,max =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 age/min,max - =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = :ref:`quotas `/ms,bytes,reset_interval_ms,effective_bytes,goa= l_tuner =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 weights/sz_permil,nr_accesses_permil,age_permil =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 :ref:`goals `/nr_goals =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 =E2=94=82 0/target_metric,target_value,current_value,nid,path @@ -377,9 +377,9 @@ schemes//quotas/ The directory for the :ref:`quotas ` of the giv= en DAMON-based operation scheme. =20 -Under ``quotas`` directory, four files (``ms``, ``bytes``, -``reset_interval_ms``, ``effective_bytes``) and two directories (``weights= `` and -``goals``) exist. +Under ``quotas`` directory, five files (``ms``, ``bytes``, +``reset_interval_ms``, ``effective_bytes`` and ``goal_tuner``) and two +directories (``weights`` and ``goals``) exist. =20 You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, a= nd ``reset interval`` in milliseconds by writing the values to the three file= s, @@ -390,6 +390,14 @@ apply the action to only up to ``bytes`` bytes of memo= ry regions within the quota limits unless at least one :ref:`goal ` is set. =20 +You can set the goal-based effective quota auto-tuning algorithm to use, by +writing the algorithm name to ``goal_tuner`` file. Reading the file retur= ns +the currently selected tuner algorithm. Refer to the design documentation= of +:ref:`automatic quota tuning goals = ` for +the background design of the feature and the name of the selectable algori= thms. +Refer to :ref:`goals directory ` for the goals +setup. + The time quota is internally transformed to a size quota. Between the transformed size quota and user-specified size quota, smaller one is appli= ed. Based on the user-specified :ref:`goal `, the --=20 2.47.3