From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 35BA5CD4F56 for ; Mon, 18 May 2026 23:42:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 02CAF6B00CA; Mon, 18 May 2026 19:41:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D3EA86B00C8; Mon, 18 May 2026 19:41:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ACE2D6B00CB; Mon, 18 May 2026 19:41:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 761A06B00C8 for ; Mon, 18 May 2026 19:41:34 -0400 (EDT) Received: from smtpin05.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 3F261A092E for ; Mon, 18 May 2026 23:41:34 +0000 (UTC) X-FDA: 84782164908.05.43F1F0E Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf17.hostedemail.com (Postfix) with ESMTP id 9583240008 for ; Mon, 18 May 2026 23:41:32 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="kYki/Wx0"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of sj@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=sj@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1779147692; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=StcWHKq5cVjmt1v9cZEkpYS8NnTvYOlOpx8onv93C3A=; b=KfjoYU2rqYr03C19txmvQ7XLPvhMEnWEEk5ArtopQ6wK+3YnnkqJa2lm/aN8gD85Pj3chh 5WVrKtP9phfL+sIam3sXu5b+4G/fIHtYTwUwE92tBzomf9e0WgwrmzjxY+itOa8dGwgu3e uOqXM0tTCFyvtRI9mc72QArSeagTLAQ= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1779147692; a=rsa-sha256; cv=none; b=6pihcRCqCqquOTs3rbpm0LePegBXV9QjNBJK+LJiZjErpGMzMNrzOba22GcxqRAfgJ2W8h WNX4ufBTV4NjwXa/nnHAhYDrAnSHSkkGwBqJqZFa2BW7sKg6to9oL8lq1GJQY2hDVNZvxi E6cff2Z+VrrlvOgfunlHfRUssK2klJs= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="kYki/Wx0"; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf17.hostedemail.com: domain of sj@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=sj@kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 1DE5760123; Mon, 18 May 2026 23:41:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4BF72C2BCB8; Mon, 18 May 2026 23:41:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1779147691; bh=7jjwSTj0oWvjONIEU6hizSouOGWRpTuxqy3LQsj9UQc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kYki/Wx0XXVJgKBiW6cFEviE1oaaTeAmamUswBb7Nj79oB4pX/QV4+bmAo8ErWIMF LQ7PR0kapL/4lP90Bkcu1srMFcPDP3GRpljYT+oafXfi4rBfXr145kGW9teb+RrNr7 5Qoh3qXYWOkWclcotzKkKarSeLE03ubHKXWFY1KyFXMXeKv21/ikR+IbsPrUaldnAG xsJxq/j62exPyjowPIXpvW33jm1KcLzqa1abnFFFhFEySpHtNNv3FaOMI1wIqG3oVt tmjjcDu9e+jj7WT4v6D7YLWL+eLzTtY9cKgagm4xTUHXw4eheLCI/Xk1wEPlL06Rvv RqWIOSgzqgMzA== 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 21/28] Docs/admin-guide/mm/damon/usage: document data attributes monitoring Date: Mon, 18 May 2026 16:41:09 -0700 Message-ID: <20260518234119.97569-22-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260518234119.97569-1-sj@kernel.org> References: <20260518234119.97569-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 9583240008 X-Rspamd-Server: rspam04 X-Stat-Signature: xgywk6a8ordo5oyhcudwije6r4w67e45 X-HE-Tag: 1779147692-189046 X-HE-Meta: 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 bowkSzEY T7JcWpfMhfXCKhvH5ZXf470Yvwycls3cPHdyZxCEGvPLlCmh9adgHb5v8V5jPXoIlYDoSXR3YQRkyTFlelS2rWIWuJTM5qNqR1Tg++YCMdtS4q0+9P+BTHE+zOp0rWCtosJ6UczV3XTt+CA/JCoSOYKMs3+EGLvCf1cIB9ZmPRuFEBGos8OMXIPbCS/T0V54H7ytaksL2+QjQDTNgIR9pZ2BFNRtY7LlAfkVPubt06a/MN9qMGRAthnOgqb6bYL8I/nlh7eJhzmSkmCdJTNxiYhQ3VXa+flYm3ronppOxeSl2TNgTd+tb4Ut6Gg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Update DAMON usage document for the newly added data attributes monitoring feature. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 44 ++++++++++++++++++-- Documentation/mm/damon/design.rst | 2 + 2 files changed, 43 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index c74dfa0ff3bfb..abd38385b3c23 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -72,6 +72,11 @@ comma (","). │ │ │ │ │ │ intervals/sample_us,aggr_us,update_us │ │ │ │ │ │ │ intervals_goal/access_bp,aggrs,min_sample_us,max_sample_us │ │ │ │ │ │ nr_regions/min,max + │ │ │ │ │ │ :ref:`probes `/nr_probes + │ │ │ │ │ │ │ 0/filters/nr_filters + │ │ │ │ │ │ │ │ 0/type,matching,allow + │ │ │ │ │ │ │ │ ... + │ │ │ │ │ │ │ ... │ │ │ │ │ :ref:`targets `/nr_targets │ │ │ │ │ │ :ref:`0 `/pid_target,obsolete_target │ │ │ │ │ │ │ :ref:`regions `/nr_regions @@ -98,6 +103,9 @@ comma (","). │ │ │ │ │ │ │ :ref:`stats `/nr_tried,sz_tried,nr_applied,sz_applied,sz_ops_filter_passed,qt_exceeds,nr_snapshots,max_nr_snapshots │ │ │ │ │ │ │ :ref:`tried_regions `/total_bytes │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age,sz_filter_passed + │ │ │ │ │ │ │ │ │ probes + │ │ │ │ │ │ │ │ │ │ 0/hits + │ │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... @@ -227,8 +235,8 @@ contexts//monitoring_attrs/ Files for specifying attributes of the monitoring including required quality and efficiency of the monitoring are in ``monitoring_attrs`` directory. -Specifically, two directories, ``intervals`` and ``nr_regions`` exist in this -directory. +Specifically, three directories, ``intervals``, ``nr_regions`` and ``probes`` +exist in this directory. Under ``intervals`` directory, three files for DAMON's sampling interval (``sample_us``), aggregation interval (``aggr_us``), and update interval @@ -262,6 +270,27 @@ tuning-applied current values of the two intervals can be read from the ``sample_us`` and ``aggr_us`` files after writing ``update_tuned_intervals`` to the ``state`` file. +.. _damon_usage_sysfs_probes: + +contexts//monitoring_attrs/probes/ +------------------------------------- + +A directory for registering :ref:`data attributes monitoring +` probes. + +In the beginning, this directory has only one file, ``nr_probes``. Writing a +number (``N``) to the file creates the number of child directories named ``0`` +to ``N-1``. Each directory represents each monitoring probe. + +In each probe directory, one directory, ``filters`` exists. The directory +contains files for installing filters for the probe, that is used to determine +the data attribute for the probe. + +In the beginning, ``filters`` directory has only one file, ``nr_filters``. +Writing a number (``N``) to the file creates the number of child directories +named ``0`` to ``N-1``. Each directory represents each filter and works in a +way similar to that for :ref:`DAMOS filter `. + .. _sysfs_targets: contexts//targets/ @@ -615,10 +644,19 @@ tried_regions// ------------------ In each region directory, you will find five files (``start``, ``end``, -``nr_accesses``, ``age``, and ``sz_filter_passed``). Reading the files will +``nr_accesses``, ``age`` and ``sz_filter_passed``). Reading the files will show the properties of the region that corresponding DAMON-based operation scheme ``action`` has tried to be applied. +tried_regions//probes/ +------------------------- + +In each region directory, one directory (``probes``) also exists. In the +directory, subdirectories named ``0`` to ``N-1`` exists. ``N`` is the number +of installed probes. In each number-named directory, a file (``hits``) exist. +Reading the file shows the number of data attributes monitoring probe-hit +positive samples of the region. + Example ~~~~~~~ diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst index 7fcb726263c1a..937960d2b6d73 100644 --- a/Documentation/mm/damon/design.rst +++ b/Documentation/mm/damon/design.rst @@ -276,6 +276,8 @@ interval``, DAMON checks if the region's size and access frequency (``nr_accesses``) has significantly changed. If so, the counter is reset to zero. Otherwise, the counter is increased. +.. _damon_design_data_attrs_monitoring: + Data Attributes Monitoring ~~~~~~~~~~~~~~~~~~~~~~~~~~ -- 2.47.3