From patchwork Wed Dec 16 09:42:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 11977131 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60AF7C4361B for ; Wed, 16 Dec 2020 09:44:50 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DAFFE233CF for ; Wed, 16 Dec 2020 09:44:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DAFFE233CF 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 1AE196B006C; Wed, 16 Dec 2020 04:44:49 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 184F56B006E; Wed, 16 Dec 2020 04:44:49 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 09CB76B0073; Wed, 16 Dec 2020 04:44:49 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0155.hostedemail.com [216.40.44.155]) by kanga.kvack.org (Postfix) with ESMTP id E8B8C6B006C for ; Wed, 16 Dec 2020 04:44:48 -0500 (EST) Received: from smtpin07.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id B5007180A6070 for ; Wed, 16 Dec 2020 09:44:48 +0000 (UTC) X-FDA: 77598661056.07.curve04_3e14c052742b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin07.hostedemail.com (Postfix) with ESMTP id A6C8E1811CE58 for ; Wed, 16 Dec 2020 09:44:48 +0000 (UTC) X-HE-Tag: curve04_3e14c052742b X-Filterd-Recvd-Size: 5984 Received: from smtp-fw-4101.amazon.com (smtp-fw-4101.amazon.com [72.21.198.25]) by imf19.hostedemail.com (Postfix) with ESMTP for ; Wed, 16 Dec 2020 09:44:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.com; i=@amazon.com; q=dns/txt; s=amazon201209; t=1608111888; x=1639647888; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=TaBhL5HojO46LzRrtNTJtjXeDGLmPmatGGRehayYLuY=; b=U57bEHOVKugNQayXIYwU6V4UhUFiT2aXe9ET/KKTdzpzgs1SQRJtfK5b uX8W57zW72ZRH629gOs2I5sqVtA/FxSXsGMhRT0pjm7faM6XqxehX9NK1 Q0sDySmjaKZcHYq59b0JFZrYpzsjlRmj0qCj3kk4tNpjAxVmlHMf2n/Lq k=; X-IronPort-AV: E=Sophos;i="5.78,424,1599523200"; d="scan'208";a="69703881" Received: from iad12-co-svc-p1-lb1-vlan2.amazon.com (HELO email-inbound-relay-2a-c5104f52.us-west-2.amazon.com) ([10.43.8.2]) by smtp-border-fw-out-4101.iad4.amazon.com with ESMTP; 16 Dec 2020 09:44:44 +0000 Received: from EX13D31EUA001.ant.amazon.com (pdx1-ws-svc-p6-lb9-vlan3.pdx.amazon.com [10.236.137.198]) by email-inbound-relay-2a-c5104f52.us-west-2.amazon.com (Postfix) with ESMTPS id 26284A1DA0; Wed, 16 Dec 2020 09:44:31 +0000 (UTC) Received: from u3f2cd687b01c55.ant.amazon.com (10.43.161.31) by EX13D31EUA001.ant.amazon.com (10.43.165.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 16 Dec 2020 09:44:14 +0000 From: SeongJae Park To: CC: SeongJae Park , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC v10 05/13] Docs/admin-guide/mm/damon: Document 'init_regions' feature Date: Wed, 16 Dec 2020 10:42:13 +0100 Message-ID: <20201216094221.11898-6-sjpark@amazon.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201216094221.11898-1-sjpark@amazon.com> References: <20201216094221.11898-1-sjpark@amazon.com> MIME-Version: 1.0 X-Originating-IP: [10.43.161.31] X-ClientProxiedBy: EX13D16UWB001.ant.amazon.com (10.43.161.17) To EX13D31EUA001.ant.amazon.com (10.43.165.15) 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 ------