From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 D881E433BB0; Tue, 1 Sep 2026 04:34:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788237273; cv=none; b=UquCh8uJDCCAIAE9qJiehHYm2CyNocoibGpq5T8VSpXCwdfTJA0zaaPyQcKVDp0UwokzriXlcbg/wdczeHXGKEDHDJH5yJOIZNbpOKbejAJ5fm7xiXll4udmcJXWIE+0qL7Nxr1R+6YlUPCHgO9ubZb6AIeAkrH0Xy10zW6Y5oI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788237273; c=relaxed/simple; bh=g/tFPfelQzKUfzsRZPs73xHoniRK3oTmoDYddCctcSI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oPtWWTxObuS+5O2aCpiD6SiMB2sGphv3qTgTPFvdExjFvi/k8Q7LKDrRePAQX+4ecHlLzHRcMf6+OOJ/mGLgSAvlhxngtyZStV4sqTYY+TogTcW91BxN+sEmftDY0X0WylxaeY/eZIBAfjfu1cYH6SGdtedwAwSbSjdusKAolKs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E54dGmV+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="E54dGmV+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 370791F00A3F; Tue, 1 Sep 2026 04:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788237271; bh=PjqVhtQyye+bbFZP93YpIQ5LAq+rT1MA3lQj7bnBnXw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=E54dGmV+ijmLuWB8ca5ofN+kA/w6tVCBO5KUhCKNGelJFI4PmgsMMVB5Dpvcgk/HK uSsQT233Oud8vsXqD1t+tqGWAWy6Hjv5XvpDrEm9ePM8vNgIxCCvRkqkk7xreuWYlO DFKplMDLD4B0WhLknxqMVvShwQGh2wTNfBHa0d/E3/BEBHzOsxfsR2CzWo73FRxi+w ZNTKvaK21djuUvfW8Le/iaBTSBbExTyzVOLIqx0BpPNob44racSlYZywU4RpCDr1US Yeo1Id7ps2LAeg7V1g5K6Tsz8Ww6465Iy4/MmgQ2MsqrmwFO+sDT6D/V2YFuB1TqF6 2aQy3OT6tb10w== From: SJ Park To: Andrew Morton Cc: SJ Park , "Liam R. Howlett" , David Hildenbrand , Jonathan Corbet , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Randy Dunlap , 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 16/17] Docs/admin-guide/mm/damon/usage: document probe preps sysfs files Date: Mon, 31 Aug 2026 21:34:12 -0700 Message-ID: <20260901043417.2165-17-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901043417.2165-1-sj@kernel.org> References: <20260901043417.2165-1-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 DAMON probe preps sysfs files. Signed-off-by: SJ Park --- Documentation/admin-guide/mm/damon/usage.rst | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index da5f9afd08aef..023c6334024f8 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -74,6 +74,9 @@ comma (","). │ │ │ │ │ │ nr_regions/min,max │ │ │ │ │ │ :ref:`probes `/nr_probes │ │ │ │ │ │ │ 0/weight + │ │ │ │ │ │ │ │ preps/nr_preps + │ │ │ │ │ │ │ │ │ 0/prep_action + │ │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ │ │ filters/nr_filters │ │ │ │ │ │ │ │ │ 0/type,matching,allow,path │ │ │ │ │ │ │ │ │ ... @@ -283,9 +286,18 @@ 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 each probe directory, two directories, ``preps`` and ``filters`` exist. The +directories contain files for installing probing preparation actions and +filters for the probe, that are used to determine the data attribute for the +probe. + +In the beginning, ``preps`` directory has only one file, ``nr_preps``. +Writing a number (``N``) to the file creates the number of child directories +named ``0`` to ``N-1``. Each directory represents each preparation action. +Each directory has one file, ``prep_action``. The preparation action can be +selected by writing the name of the action to the ``prep_action`` file. Refer +to the :ref:`design doc ` for the list of +supported actions. Each probe directory also contains ``weight`` file. Reading from and writing to the file gets and sets the :ref:`attributes-only monitoring -- 2.47.3