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 24FB7200B95; Thu, 9 Jan 2025 17:51:48 +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=1736445108; cv=none; b=taDw5wrgPdpF0ihjNY3p1jFLML5BtR0MczBUz1+8qZvgg6WnTXYEpT6uUIMwisjtVluMtmn14J5oov/Av/7IthGEt61rtn8zT7DoxKoZf0BzX/ILA54Z8w2vKrqHYPFJUE/t2kxCq5VPQUKbKL1LqYkb1cZhgVIVuji+QET16Lg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736445108; c=relaxed/simple; bh=IPoCvtuIbYdm4duAoYfcI65fUkKJC3T/ANKcwt19fcA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=BKclcyqkYLbt9gSCrynEhNmmyqfbqVr6uS4sCTtAv0pZUtaDO8BZlvBTnhKMkQRSayo0WXWZZu8OwhGvd82qiGakpSbLdSa837WiTWILgpFqWQmDt67xGlOd3/7Xg7ofzSKGfcX2QOTMb0JPUaFSqFD/WRsS6zt/bXYL24lprmk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LYYfWteP; 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="LYYfWteP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CE000C4CED2; Thu, 9 Jan 2025 17:51:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1736445108; bh=IPoCvtuIbYdm4duAoYfcI65fUkKJC3T/ANKcwt19fcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LYYfWtePMZTuxd4s2GRIBuHgMcxlCm6/g/nwHTX+qzJ7Q6oLzDb2N+B1qx/ANy6JG L1b4uwDm3AKkYPa/sfWJjSAL66RbSTW3nLyZWT9jTaASpJ4cEXQ74jjvoyilcVQY1d PP7mKtMt24H07N0YUyegP4mhDWuLcRUT9CUFr2gTBJQRpEUpGiCB83EIe8lfy2Xhzu oTP6cwo+p9jhLLfM95fIY6vLvK5qkcacQKOoIytnlhKZccWnrLkiW12ZH6my+gSpAs EQd6ed51aVz/lHT/cjkYTLpliY6WIn34vQifkLkZ5cCzCG4V6mPAg0TeF79cD7jOhU yuOlq4RRSgFHw== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Jonathan Corbet , damon@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 10/10] Docs/admin-guide/mm/damon/usage: document DAMOS filter 'allow' sysfs file Date: Thu, 9 Jan 2025 09:51:26 -0800 Message-Id: <20250109175126.57878-11-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250109175126.57878-1-sj@kernel.org> References: <20250109175126.57878-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Update DAMON usage document for the newly added 'allow' sysfs file for DAMOS filters. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 33 +++++++++++--------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index 8df3357dcfa3..f0d0c20711d6 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -83,7 +83,7 @@ comma (","). │ │ │ │ │ │ │ │ │ 0/target_metric,target_value,current_value │ │ │ │ │ │ │ :ref:`watermarks `/metric,interval_us,high,mid,low │ │ │ │ │ │ │ :ref:`filters `/nr_filters - │ │ │ │ │ │ │ │ 0/type,matching,memcg_id + │ │ │ │ │ │ │ │ 0/type,matching,memcg_id,allow │ │ │ │ │ │ │ :ref:`stats `/nr_tried,sz_tried,nr_applied,sz_applied,sz_ops_filter_passed,qt_exceeds │ │ │ │ │ │ │ :ref:`tried_regions `/total_bytes │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age,sz_filter_passed @@ -406,13 +406,14 @@ number (``N``) to the file creates the number of child directories named ``0`` to ``N-1``. Each directory represents each filter. The filters are evaluated in the numeric order. -Each filter directory contains six files, namely ``type``, ``matcing``, -``memcg_path``, ``addr_start``, ``addr_end``, and ``target_idx``. To ``type`` -file, you can write one of five special keywords: ``anon`` for anonymous pages, -``memcg`` for specific memory cgroup, ``young`` for young pages, ``addr`` for -specific address range (an open-ended interval), or ``target`` for specific -DAMON monitoring target filtering. Meaning of the types are same to the -description on the :ref:`design doc `. +Each filter directory contains seven files, namely ``type``, ``matching``, +``allow``, ``memcg_path``, ``addr_start``, ``addr_end``, and ``target_idx``. +To ``type`` file, you can write one of five special keywords: ``anon`` for +anonymous pages, ``memcg`` for specific memory cgroup, ``young`` for young +pages, ``addr`` for specific address range (an open-ended interval), or +``target`` for specific DAMON monitoring target filtering. Meaning of the +types are same to the description on the :ref:`design doc +`. In case of the memory cgroup filtering, you can specify the memory cgroup of the interest by writing the path of the memory cgroup from the cgroups mount @@ -422,25 +423,29 @@ specify the start and end address of the range to ``addr_start`` and you can specify the index of the target between the list of the DAMON context's monitoring targets list to ``target_idx`` file. -You can write ``Y`` or ``N`` to ``matching`` file to filter out pages that does -or does not match to the type, respectively. Then, the scheme's action will -not be applied to the pages that specified to be filtered out. +You can write ``Y`` or ``N`` to ``matching`` file to specify whether the filter +is for memory that matches the ``type``. You can write ``Y`` or ``N`` to +``allow`` file to specify if applying the action to the memory that satisfies +the ``type`` and ``matching`` should be allowed or not. For example, below restricts a DAMOS action to be applied to only non-anonymous pages of all memory cgroups except ``/having_care_already``.:: # echo 2 > nr_filters - # # filter out anonymous pages + # # disallow anonymous pages echo anon > 0/type echo Y > 0/matching + echo N > 0/allow # # further filter out all cgroups except one at '/having_care_already' echo memcg > 1/type echo /having_care_already > 1/memcg_path echo Y > 1/matching + echo N > 1/allow Refer to the :ref:`DAMOS filters design documentation -` for more details including when each of the -filters are supported and differences on stats. +` for more details including how multiple filters +of different ``allow`` works, when each of the filters are supported, and +differences on stats. .. _sysfs_schemes_stats: -- 2.39.5