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 B4521C678D4 for ; Thu, 19 Jan 2023 01:17:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229737AbjASBRP (ORCPT ); Wed, 18 Jan 2023 20:17:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229834AbjASBPb (ORCPT ); Wed, 18 Jan 2023 20:15:31 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E84B023D95 for ; Wed, 18 Jan 2023 17:14:42 -0800 (PST) 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 dfw.source.kernel.org (Postfix) with ESMTPS id 8355961B0E for ; Thu, 19 Jan 2023 01:14:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDB2DC433D2; Thu, 19 Jan 2023 01:14:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1674090882; bh=YLxmc4bhMyJHJXuDEBK6+TMr4rCP5a6rsOEWCtw5NUI=; h=Date:To:From:Subject:From; b=X71u2ohqZL5+1c5XMokvqUVQ7vQmd8pq5IOutIuTUi+9Vx5c5ewOydqdCd8Jr5g8K Zw+quhVLD6oI/i5Xl3ovn47LUXYinx3zZRuWdQTMYFzQJOMTDxWB8v/piQq6BtNLF9 5v+LEiLRFuCYE8j4pmZTX95DZwsmPhZWjIfdoWPw= Date: Wed, 18 Jan 2023 17:14:41 -0800 To: mm-commits@vger.kernel.org, shuah@kernel.org, corbet@lwn.net, sj@kernel.org, akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] docs-admin-guide-mm-damon-usage-document-damos-filters-of-sysfs.patch removed from -mm tree Message-Id: <20230119011441.DDB2DC433D2@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The quilt patch titled Subject: Docs/admin-guide/mm/damon/usage: document DAMOS filters of sysfs has been removed from the -mm tree. Its filename was docs-admin-guide-mm-damon-usage-document-damos-filters-of-sysfs.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: SeongJae Park Subject: Docs/admin-guide/mm/damon/usage: document DAMOS filters of sysfs Date: Mon, 5 Dec 2022 23:08:29 +0000 Document about the newly added files for DAMOS filters on the DAMON usage document. Link: https://lkml.kernel.org/r/20221205230830.144349-11-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Cc: Shuah Khan Signed-off-by: Andrew Morton --- Documentation/admin-guide/mm/damon/usage.rst | 48 ++++++++++++++++- 1 file changed, 46 insertions(+), 2 deletions(-) --- a/Documentation/admin-guide/mm/damon/usage.rst~docs-admin-guide-mm-damon-usage-document-damos-filters-of-sysfs +++ a/Documentation/admin-guide/mm/damon/usage.rst @@ -87,6 +87,8 @@ comma (","). :: │ │ │ │ │ │ │ quotas/ms,bytes,reset_interval_ms │ │ │ │ │ │ │ │ weights/sz_permil,nr_accesses_permil,age_permil │ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low + │ │ │ │ │ │ │ filters/nr_filters + │ │ │ │ │ │ │ │ 0/type,matching,memcg_id │ │ │ │ │ │ │ stats/nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds │ │ │ │ │ │ │ tried_regions/ │ │ │ │ │ │ │ │ 0/start,end,nr_accesses,age @@ -151,6 +153,8 @@ number (``N``) to the file creates the n moment, only one context per kdamond is supported, so only ``0`` or ``1`` can be written to the file. +.. _sysfs_contexts: + contexts// ------------- @@ -268,8 +272,8 @@ schemes// ------------ In each scheme directory, five directories (``access_pattern``, ``quotas``, -``watermarks``, ``stats``, and ``tried_regions``) and one file (``action``) -exist. +``watermarks``, ``filters``, ``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 @@ -347,6 +351,46 @@ as below. The ``interval`` should written in microseconds unit. +schemes//filters/ +-------------------- + +Users could know something more than the kernel for specific types of memory. +In the case, users could do their own management for the memory and hence +doesn't want DAMOS bothers that. Users could limit DAMOS by setting the access +pattern of the scheme and/or the monitoring regions for the purpose, but that +can be inefficient in some cases. In such cases, users could set non-access +pattern driven filters using files in this directory. + +In the beginning, this 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. The filters are evaluated +in the numeric order. + +Each filter directory contains three files, namely ``type``, ``matcing``, and +``memcg_path``. You can write one of two special keywords, ``anon`` for +anonymous pages, or ``memcg`` for specific memory cgroup filtering. 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 point to +``memcg_path`` 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. + +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 + echo anon > 0/type + echo Y > 0/matching + # # further filter out all cgroups except one at '/having_care_already' + echo memcg > 1/type + echo /having_care_already > 1/memcg_path + echo N > 1/matching + +Note that filters could be ignored depend on the running DAMON operations set +`implementation `. + .. _sysfs_schemes_stats: schemes//stats/ _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-update-kernel-doc-comments-for-damos-action-supports-of-each-damon-operations-set.patch mm-damon-core-update-kernel-doc-comments-for-damos-filters-supports-of-each-damon-operations-set.patch docs-mm-damon-index-mention-damos-on-the-intro.patch docs-admin-guide-mm-damon-usage-update-damos-actions-filters-supports-of-each-damon-operations-set.patch docs-mm-damon-add-a-maintainer-profile-for-damon.patch maintainers-damon-link-maintainer-profile-git-trees-and-website.patch selftests-damon-sysfs-hide-expected-write-failures.patch selftests-damon-debugfs_rm_non_contexts-hide-expected-write-error-messages.patch scripts-spelling-add-a-few-more-typos.patch