From patchwork Mon Aug 31 10:47:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11746125 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 03ABF138A for ; Mon, 31 Aug 2020 10:49:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BBC0B206F0 for ; Mon, 31 Aug 2020 10:49:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=amazon.com header.i=@amazon.com header.b="u/xZp60R" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BBC0B206F0 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=amazon.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 063416B0003; Mon, 31 Aug 2020 06:49:38 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id F2D2E6B0008; Mon, 31 Aug 2020 06:49:37 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E1F9D6B000A; Mon, 31 Aug 2020 06:49:37 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0221.hostedemail.com [216.40.44.221]) by kanga.kvack.org (Postfix) with ESMTP id CDDBC6B0003 for ; Mon, 31 Aug 2020 06:49:37 -0400 (EDT) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 09E573632 for ; Mon, 31 Aug 2020 10:49:36 +0000 (UTC) X-FDA: 77210542794.05.prose67_35055a52708f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id AF505180196AB for ; Mon, 31 Aug 2020 10:49:36 +0000 (UTC) X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,prvs=5052c6ed3=sjpark@amazon.com,,RULES_HIT:30003:30054:30064:30070:30080,0,RBL:207.171.190.10:@amazon.com:.lbl8.mailshell.net-62.18.0.100 66.10.201.10;04yfhgziu1byi96t9ompyn3tfbmm5opho4d4zpweyut56z6ysf75779qgbhjzty.qht5tmy5qm637jdia3c9z6wq8dyozy19mp85uzmbn815ywo35t51xbxr4jzoegq.a-lbl8.mailshell.net-223.238.255.100,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fp,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:24,LUA_SUMMARY:none X-HE-Tag: prose67_35055a52708f X-Filterd-Recvd-Size: 5981 Received: from smtp-fw-33001.amazon.com (smtp-fw-33001.amazon.com [207.171.190.10]) by imf23.hostedemail.com (Postfix) with ESMTP for ; Mon, 31 Aug 2020 10:49:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1598870976; x=1630406976; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=TaBhL5HojO46LzRrtNTJtjXeDGLmPmatGGRehayYLuY=; b=u/xZp60RNqzVJhtwyaOlrUJwTViXxDYEPW8kKSu3hO1SjypXMdQSK7S8 JJ8RX8r7KWWngf+y3Y2H6eGxsKrpKsFQabON3Kc3KDLi7mJt1FodziU92 gOAk78IH8b5NToSgEwLzoK54XMulxPwGNIJaPEiApxu5BTd5xDekuAp6Z c=; X-IronPort-AV: E=Sophos;i="5.76,375,1592870400"; d="scan'208";a="71144192" Received: from sea32-co-svc-lb4-vlan3.sea.corp.amazon.com (HELO email-inbound-relay-2a-119b4f96.us-west-2.amazon.com) ([10.47.23.38]) by smtp-border-fw-out-33001.sea14.amazon.com with ESMTP; 31 Aug 2020 10:49:33 +0000 Received: from EX13D31EUB001.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2a-119b4f96.us-west-2.amazon.com (Postfix) with ESMTPS id 11D311A0476; Mon, 31 Aug 2020 10:49:30 +0000 (UTC) Received: from u3f2cd687b01c55.ant.amazon.com (10.43.160.100) by EX13D31EUB001.ant.amazon.com (10.43.166.210) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 31 Aug 2020 10:49:13 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC v8 05/10] Docs/admin-guide/mm/damon: Document 'init_regions' feature Date: Mon, 31 Aug 2020 12:47:25 +0200 Message-ID: <20200831104730.28970-6-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200831104730.28970-1-sjpark@amazon.com> References: <20200831104730.28970-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.160.100] X-ClientProxiedBy: EX13D49UWB002.ant.amazon.com (10.43.163.68) To EX13D31EUB001.ant.amazon.com (10.43.166.210) X-Rspamd-Queue-Id: AF505180196AB X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: SeongJae Park This commit adds description of the 'init_regions' feature in the DAMON usage document. Signed-off-by: SeongJae Park --- Documentation/admin-guide/mm/damon/usage.rst | 41 +++++++++++++++++++- 1 file changed, 39 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index 96278227f925..cf0d44ce0ac9 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -281,8 +281,9 @@ for at least 100 milliseconds using below commands:: debugfs Interface ================= -DAMON exports five files, ``attrs``, ``target_ids``, ``record``, ``schemes`` -and ``monitor_on`` under its debugfs directory, ``/damon/``. +DAMON exports six files, ``attrs``, ``target_ids``, ``init_regions``, +``record``, ``schemes`` and ``monitor_on`` under its debugfs directory, +``/damon/``. Attributes @@ -321,6 +322,42 @@ check it again:: Note that setting the target ids doesn't start the monitoring. +Initial Monitoring Target Regions +--------------------------------- + +In case of the debugfs based monitoring, DAMON automatically sets and updates +the monitoring target regions so that entire memory mappings of target +processes can be covered. However, users might want to limit the monitoring +region to specific address ranges, such as the heap, the stack, or specific +file-mapped area. Or, some users might know the initial access pattern of +their workloads and therefore want to set optimal initial regions for the +'adaptive regions adjustment'. + +In such cases, users can explicitly set the initial monitoring target regions +as they want, by writing proper values to the ``init_regions`` file. Each line +of the input should represent one region in below form.:: + + + +The ``target id`` should already in ``target_ids`` file, and the regions should +be passed in address order. For example, below commands will set a couple of +address ranges, ``1-100`` and ``100-200`` as the initial monitoring target +region of process 42, and another couple of address ranges, ``20-40`` and +``50-100`` as that of process 4242.:: + + # cd /damon + # echo "42 1 100 + 42 100 200 + 4242 20 40 + 4242 50 100" > init_regions + +Note that this sets the initial monitoring target regions only. In case of +virtual memory monitoring, DAMON will automatically updates the boundary of the +regions after one ``regions update interval``. Therefore, users should set the +``regions update interval`` large enough in this case, if they don't want the +update. + + Record ------