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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A55FFC43219 for ; Tue, 1 Nov 2022 22:03:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231163AbiKAWDm (ORCPT ); Tue, 1 Nov 2022 18:03:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43640 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231164AbiKAWDl (ORCPT ); Tue, 1 Nov 2022 18:03:41 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 55B5B6565; Tue, 1 Nov 2022 15:03:40 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 07883B81F90; Tue, 1 Nov 2022 22:03:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2C393C433C1; Tue, 1 Nov 2022 22:03:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1667340217; bh=XY/ulrYaYGf2HDwTIn5UM+YygVjoR1FVPIUX5UmsGLg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gAuVFi8XC9immb+OBoh45a69etCiIxST3cQ8zlUrBziijVny5gzKm1g6mJqPwryDE gu2m/my5MjOsEff8QdTwpPM2gvreMqHywFlVaGUGE6HrZCS5jBn8HAUSAu7K0t+t8b 3+ATJxW4lPChNcbiIe/KTaGpulS+IsO62n4Zh6qaDCvakn40ifgWtX2ZMwmtuuMFis W2Dd1zQSIB/iAhpN+GeC9JlZtMW1pwuE/lQU7II4S32fjxG6RY/WSqOEzOeQ1hb4c0 9C9pYgxdYobujW+mCapDZEkkGu5CLw0gQj/h94WcbzWiluppkFQGpJWraXyg90HgV/ mpibBeqhmoKNQ== From: SeongJae Park To: Andrew Morton Cc: Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [PATCH 7/8] Docs/admin-guide/mm/damon/usage: document schemes//tried_regions sysfs directory Date: Tue, 1 Nov 2022 22:03:27 +0000 Message-Id: <20221101220328.95765-8-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221101220328.95765-1-sj@kernel.org> References: <20221101220328.95765-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Document 'tried_regions' directory in DAMON sysfs interface usage in the administrator guide. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 45 ++++++++++++++++++-- 1 file changed, 42 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index c17e02e1e426..1a5b6b71efa1 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -88,6 +88,9 @@ comma (","). :: │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds + │ │ │ │ │ │ │ tried_regions/ + │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age + │ │ │ │ │ │ │ │ ... │ │ │ │ │ │ ... │ │ │ │ ... │ │ ... @@ -125,7 +128,14 @@ in the state. Writing ``commit`` to the ``state`` file makes kdamond reads the user inputs in the sysfs files except ``state`` file again. Writing ``update_schemes_stats`` to ``state`` file updates the contents of stats files for each DAMON-based operation scheme of the kdamond. For details of the -stats, please refer to :ref:`stats section `. +stats, please refer to :ref:`stats section `. Writing +``update_schemes_tried_regions`` to ``state`` file updates the DAMON-based +operation scheme action tried regions directory for each DAMON-based operation +scheme of the kdamond. Writing ``clear_schemes_tried_regions`` to ``state`` +file clears the DAMON-based operating scheme action tried regions directory for +each DAMON-based operation scheme of the kdamond. For details of the +DAMON-based operation scheme action tried regions directory, please refer to +:ref:tried_regions section `. If the state is ``on``, reading ``pid`` shows the pid of the kdamond thread. @@ -166,6 +176,8 @@ You can set and get what type of monitoring operations DAMON will use for the context by writing one of the keywords listed in ``avail_operations`` file and reading from the ``operations`` file. +.. _sysfs_monitoring_attrs: + contexts//monitoring_attrs/ ------------------------------ @@ -255,8 +267,9 @@ to ``N-1``. Each directory represents each DAMON-based operation scheme. schemes// ------------ -In each scheme directory, four directories (``access_pattern``, ``quotas``, -``watermarks``, and ``stats``) and one file (``action``) exist. +In each scheme directory, five directories (``access_pattern``, ``quotas``, +``watermarks``, ``stats``, and ``tried_regions``) and one file (``action``) +exist. The ``action`` file is for setting and getting what action you want to apply to memory regions having specific access pattern of the interest. The keywords @@ -351,6 +364,32 @@ should ask DAMON sysfs interface to updte the content of the files for the stats by writing a special keyword, ``update_schemes_stats`` to the relevant ``kdamonds//state`` file. +.. _sysfs_schemes_tried_regions: + +schemes//tried_regions/ +-------------------------- + +When a special keyword, ``update_schemes_tried_regions``, is written to the +relevant ``kdamonds//state`` file, DAMON creates directories named integer +starting from ``0`` under this directory. Each directory contains files +exposing detailed information about each of the memory region that the +corresponding scheme's ``action`` has tried to be applied under this directory, +during next :ref:`aggregation interval `. The +information includes address range, ``nr_accesses``, , and ``age`` of the +region. + +The directories will be removed when another special keyword, +``clear_schemes_tried_regions``, is written to the relevant +``kdamonds//state`` file. + +tried_regions// +------------------ + +In each region directory, you will find four files (``start``, ``end``, +``nr_accesses``, and ``age``). Reading the files will show the start and end +addresses, ``nr_accesses``, and ``age`` of the region that corresponding +DAMON-based operation scheme ``action`` has tried to be applied. + Example ~~~~~~~ -- 2.25.1