From nobody Mon Feb 9 05:53:00 2026 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 15E8EC04A94 for ; Wed, 2 Aug 2023 21:32:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232999AbjHBVcz (ORCPT ); Wed, 2 Aug 2023 17:32:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37324 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230099AbjHBVcd (ORCPT ); Wed, 2 Aug 2023 17:32:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4B45D19A4; Wed, 2 Aug 2023 14:32:32 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B249F61B32; Wed, 2 Aug 2023 21:32:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9802AC433C9; Wed, 2 Aug 2023 21:32:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691011951; bh=yEbF4+MD2fwxwTT+Hga32t2Dr/eR/mptRKFvKfgNyUo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZqyP22dRe9txftfj0mTUSKJdBVIfJS1fQ0q1DN993ssD71Y/JqUWnM0H60utm4t2J uMCZdbNjNYBEz2HiAbC4KO9ZTcRMCAlxOo93soa5DH1MH2yNhVq6MNYcRbGNhY0ZOB oHCr8oMfDxScd3CpAtFHklMIqLUyywRvNsuJmsL1Z3afAKXlBqtzQuw9liSjCXiwsG ZnWPOJPpSLsqkpRJCTHsn7DIS0hIFSOz0BR+yYwpUTZ8B//Vm6Re/QFwCS9iW9aQKO rVZEF0cDLe1gJGf6HsNUEyr/1p45zPFuEOX8VrD/DD6sBCE7YZRLXHgcaXt/NP7SrL sQHPQ24C4gGgg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , Jonathan Corbet , damon@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/5] Docs/admin-guide/mm/damon/usage: update for tried_regions/total_bytes Date: Wed, 2 Aug 2023 21:32:21 +0000 Message-Id: <20230802213222.109841-6-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230802213222.109841-1-sj@kernel.org> References: <20230802213222.109841-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Update the DAMON usage document for newly added schemes/.../tried_regions/total_bytes file and the update_schemes_tried_bytes command. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 42 +++++++++++++------- 1 file changed, 27 insertions(+), 15 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/a= dmin-guide/mm/damon/usage.rst index 2d495fa85a0e..1859dd6c3834 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -87,7 +87,7 @@ comma (","). :: =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = filters/nr_filters =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 0/type,matching,memcg_id =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds - =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = tried_regions/ + =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = tried_regions/total_bytes =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 0/start,end,nr_accesses,age =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 = =E2=94=82 ... =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 =E2=94=82 ... @@ -127,14 +127,18 @@ in the state. Writing ``commit`` to the ``state`` fi= le 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 f= iles for each DAMON-based operation scheme of the kdamond. For details of the -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 opera= tion -scheme of the kdamond. Writing ``clear_schemes_tried_regions`` to ``state= `` -file clears the DAMON-based operating scheme action tried regions director= y 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 `. +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 +``update_schemes_tried_bytes`` to ``state`` file updates only +``.../tried_regions/total_bytes`` files. Writing +``clear_schemes_tried_regions`` to ``state`` file clears the DAMON-based +operating scheme action tried regions directory for each DAMON-based opera= tion +scheme of the kdamond. For details of the DAMON-based operation scheme ac= tion +tried regions directory, please refer to :ref:`tried_regions section +`. =20 If the state is ``on``, reading ``pid`` shows the pid of the kdamond threa= d. =20 @@ -406,13 +410,21 @@ stats by writing a special keyword, ``update_schemes_= stats`` to the relevant schemes//tried_regions/ -------------------------- =20 +This directory initially has one file, ``total_bytes``. + When a special keyword, ``update_schemes_tried_regions``, is written to the -relevant ``kdamonds//state`` file, DAMON creates directories named inte= ger -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 direc= tory, -during next :ref:`aggregation interval `. The -information includes address range, ``nr_accesses``, and ``age`` of the re= gion. +relevant ``kdamonds//state`` file, DAMON updates the ``total_bytes`` fi= le so +that reading it returns the total size of the scheme tried regions, and cr= eates +directories named integer starting from ``0`` under this directory. Each +directory contains files exposing detailed information about each of the m= emory +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. + +Writing ``update_schemes_tried_bytes`` to the relevant ``kdamonds//stat= e`` +file will only update the ``total_bytes`` file, and will not create the +subdirectories. =20 The directories will be removed when another special keyword, ``clear_schemes_tried_regions``, is written to the relevant --=20 2.25.1