From nobody Tue Jun 16 20:35:22 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 B0D43231836; Tue, 21 Apr 2026 04:49:45 +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=1776746985; cv=none; b=Hq2VG5ChnaUf8fKKVt1CqDkh1q8a74IvUyRmyt5Fy/QQXlPumz4S4Bu7XTHfb3gaKD/58V5TrbTVJCagP7HB3OfHD7Ch4SnbzY4YCyHXnOakwzifBRf7yeb1nFrJqmN1Gx/OIYh8Z5+1RxH9Xyjbrg81BtJbHzTE37SdOXBH6A4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776746985; c=relaxed/simple; bh=ka4gbLZs99fExMD1yc1xEuZ3x1da439G/UiyCjNMmiQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=goy/5zpH21yEsuv8ucMBLnlykPtn2Q7QPPiUC5mwUg1QNi6hY1KFlYREOylgvtQE7AnC8ebocYT3oV/3Olz+mXUoRszXCpKPgdYGNuuZeUlrT8g9rDOzdMyb+FymJEQ+gHIx1bEP8o8Ym2Xlv5ZTBuMpDjsQIFIfYkyXBO7tecY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VxAXPIWx; 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="VxAXPIWx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 19FB8C2BCB5; Tue, 21 Apr 2026 04:49:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776746985; bh=ka4gbLZs99fExMD1yc1xEuZ3x1da439G/UiyCjNMmiQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VxAXPIWxB31Jk6/Qmby4wm0jEL0HHoppbsPaygsvseRuCttTk7XJFZPTDRTfu/968 sVgGpFssrD5yjsRi1eEs/w2v4V+0904KUXmvohuEvax8kBK9jjs9+Q8IwWCa8iCbaz uyUHho97AL/Gs0H4FpKrOFHa9lQ13/tdcX2Lu8mTn5yl3EbU2s5PTj3yez608G8l4m U3m6/LootpFAl/x1f84gJgMI8L+y1dB60kzpCjHDMAsw/9XamrkvuqtQg/ZtN4pGG1 gUCE3ZK30H/owzyhL1i/hpPrMvow3RJBJ9Uls6iGb18KKEuxjDNlkjI8zZlpTu9ab4 vyrcMRQs2AZkw== 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 1/2] Docs/admin-guide/mm/damon/usage: mark scheme filters sysfs dir as deprecated Date: Mon, 20 Apr 2026 21:49:26 -0700 Message-ID: <20260421044928.141388-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260421044928.141388-1-sj@kernel.org> References: <20260421044928.141388-1-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" The alternatives of 'filters/' directory, namely 'core_filters/' and 'ops_filters/', can fully support all the features 'filters/' directory can do, and provide better user experience. Having 'filters/' directory is only confusing to users. Announce it as deprecated on the usage document. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/a= dmin-guide/mm/damon/usage.rst index d5548e460857c..918c14a8e852b 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -486,9 +486,10 @@ layers. Filters that requested by ``core_filters`` an= d ``ops_filters`` will be installed before those of ``filters``. All three directories have same fi= les. =20 Use of ``filters`` directory can make expecting evaluation orders of given -filters with the files under directory bit confusing. Users are hence -recommended to use ``core_filters`` and ``ops_filters`` directories. The -``filters`` directory could be deprecated in future. +filters with the files under directory bit confusing. For the reason, +``filters`` directory is deprecated. It is still functioning, but it will= be +broken and eventually removed in near future. Users should use +``core_filters`` and ``ops_filters`` directories instead. =20 In the beginning, the directory has only one file, ``nr_filters``. Writin= g a number (``N``) to the file creates the number of child directories named `= `0`` --=20 2.47.3 From nobody Tue Jun 16 20:35:22 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 254602868A9; Tue, 21 Apr 2026 04:49:46 +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=1776746986; cv=none; b=Sn2CrO1BmQNTniMoGCoYJ9eptEqT/6iEusXR0CaITzsmzhrdL8/aHgKO1Q8Jy7GDa7p80psX/iP7Tb5ET+gF0Ix5h3P9uOPb6HcW43+asN2gE0rFghKTYwkrLo1RhDh56C8XtOULY8QB7kKGLfwZ4muHcpjnG+CQe1AgfdbUFvE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776746986; c=relaxed/simple; bh=58RqIGxjkE+DGlcSy5aHIfF8jnvuEdtFZZsL+mLllnk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u5KJ70LUX0Np9cQLVjAmZj4EmVB5p9TLM8U7ePqG6uv5bL7mdVmKbCwnMeCsaWE/uuUDr13g6O6zVWyzorepz1/OSD30yKO7yS6RVNlRtN0GUzDQ1nb08oC8C7SUtK9CbtXYIL3U5NKjJGfHOp42MYDTDvVFfMEMDH+h7k6jjFc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ULln33mB; 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="ULln33mB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BC367C2BCB3; Tue, 21 Apr 2026 04:49:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776746985; bh=58RqIGxjkE+DGlcSy5aHIfF8jnvuEdtFZZsL+mLllnk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ULln33mBNTI3tL5SwpU2ppT2qiQ22TC5bpbiUC5rjOoQj1IpPFMqFMUFXCw6yE/cv KaG90NotlnowFbXifeKAOAwW2xcmatGracrelf8vM5cRj49xOylnI4IVRJBempzfBt p3n7uRjBh1eG3WdDuw8r8kGLojkP72NQli8YgW+HLRZyiQRxSiH5hDPJpwq+Ky33D+ AqBrNbQFN0BGmV5qeIsj+kcsoCdSG0DEvtLtHsoe73Op/m2ATggp2KGYDhB1jMwsFA 2NR7UYZnxwm6KZ9HohH8QFJ1+cdEs/X+BLtuZPJ4KhyzJ1m5FqDjggB2eqe7BNfwex 4u3OkwntHcJ5g== From: SeongJae Park To: Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 2/2] Docs/ABI/damon: mark schemes//filters/ deprecated Date: Mon, 20 Apr 2026 21:49:27 -0700 Message-ID: <20260421044928.141388-3-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260421044928.141388-1-sj@kernel.org> References: <20260421044928.141388-1-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" Now the 'filters/' directory is deprecated. Update ABI document to also announce the fact. Also update the descriptions of the files to be based on 'core_filter/' directory, to make the old descriptions ready to be removed when the time arrives. Signed-off-by: SeongJae Park --- .../ABI/testing/sysfs-kernel-mm-damon | 62 ++++++++++--------- 1 file changed, 34 insertions(+), 28 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-damon b/Documentatio= n/ABI/testing/sysfs-kernel-mm-damon index 971c22e34e722..ee29d4e204ffa 100644 --- a/Documentation/ABI/testing/sysfs-kernel-mm-damon +++ b/Documentation/ABI/testing/sysfs-kernel-mm-damon @@ -396,15 +396,20 @@ Contact: SeongJae Park Description: Writing to and reading from this file sets and gets the low watermark of the scheme in permil. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters/nr_filters -Date: Dec 2022 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters +Date: Feb 2025 +Contact: SeongJae Park +Description: Directory for DAMON core layer-handled DAMOS filters. + +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters/nr_filters +Date: Feb 2025 Contact: SeongJae Park Description: Writing a number 'N' to this file creates the number of directories for setting filters of the scheme named '0' to - 'N-1' under the filters/ directory. + 'N-1' under the core_filters/ directory. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//type -Date: Dec 2022 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//type +Date: Feb 2025 Contact: SeongJae Park Description: Writing to and reading from this file sets and gets the type = of the memory of the interest. 'anon' for anonymous pages, @@ -412,77 +417,78 @@ Description: Writing to and reading from this file se= ts and gets the type of 'addr' for address range (an open-ended interval), or 'target' for DAMON monitoring target can be written and read. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//memcg_path -Date: Dec 2022 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//memcg_path +Date: Feb 2025 Contact: SeongJae Park Description: If 'memcg' is written to the 'type' file, writing to and reading from this file sets and gets the path to the memory cgroup of the interest. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//addr_start -Date: Jul 2023 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//addr_start +Date: Feb 2025 Contact: SeongJae Park Description: If 'addr' is written to the 'type' file, writing to or reading from this file sets or gets the start address of the address range for the filter. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//addr_end -Date: Jul 2023 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//addr_end +Date: Feb 2025 Contact: SeongJae Park Description: If 'addr' is written to the 'type' file, writing to or reading from this file sets or gets the end address of the address range for the filter. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//min +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//min Date: Feb 2025 Contact: SeongJae Park Description: If 'hugepage_size' is written to the 'type' file, writing to or reading from this file sets or gets the minimum size of the hugepage for the filter. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//max +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//max Date: Feb 2025 Contact: SeongJae Park Description: If 'hugepage_size' is written to the 'type' file, writing to or reading from this file sets or gets the maximum size of the hugepage for the filter. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//target_idx -Date: Dec 2022 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//target_idx +Date: Feb 2025 Contact: SeongJae Park Description: If 'target' is written to the 'type' file, writing to or reading from this file sets or gets the index of the DAMON monitoring target of the interest. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//matching -Date: Dec 2022 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//matching +Date: Feb 2025 Contact: SeongJae Park Description: Writing 'Y' or 'N' to this file sets whether the filter is for the memory of the 'type', or all except the 'type'. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters//allow -Date: Jan 2025 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters//allow +Date: Feb 2025 Contact: SeongJae Park Description: Writing 'Y' or 'N' to this file sets whether to allow or reje= ct applying the scheme's action to the memory that satisfies the 'type' and the 'matching' of the directory. =20 -What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//co= re_filters -Date: Feb 2025 -Contact: SeongJae Park -Description: Directory for DAMON core layer-handled DAMOS filters. Files - under this directory works same to those of - /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//filters - directory. - What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//op= s_filters Date: Feb 2025 Contact: SeongJae Park Description: Directory for DAMON operations set layer-handled DAMOS filter= s. Files under this directory works same to those of - /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//filters + /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//core_fi= lters directory. =20 +What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//fi= lters +Date: Dec 2022 +Contact: SeongJae Park +Description: Directory for DAMOS filters. Files under this directory works + same to those of + /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//{core,o= ps}_filters + directory. This is deprecated. Use the core_filters and + ops_filters instead. + What: /sys/kernel/mm/damon/admin/kdamonds//contexts//schemes//de= sts/nr_dests Date: Jul 2025 Contact: SeongJae Park --=20 2.47.3