From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on archive.lwn.net X-Spam-Level: X-Spam-Status: No, score=-5.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham autolearn_force=no version=3.4.2 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by archive.lwn.net (Postfix) with ESMTP id C753C7D910 for ; Mon, 6 May 2019 17:12:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727207AbfEFRME (ORCPT ); Mon, 6 May 2019 13:12:04 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:35696 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726592AbfEFRME (ORCPT ); Mon, 6 May 2019 13:12:04 -0400 Received: by mail-pg1-f193.google.com with SMTP id h1so6773858pgs.2; Mon, 06 May 2019 10:12:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=T5zzGU7rkqKqabRdTGdBNCQkm0jH6dpMGvRhTLzc/tM=; b=QRBEkic2qZzG0RSocvqyvc+xY4IpHADtYR9WsI+SdV4Fm08dr9WxgiNqoPhIlwMCl0 Yuw+3DSk0ZuoaJv70UmI7gA5E+X0Lh90DRzHszIiQlYOBjMG98RfjvqjURApUdJILoS1 EElNyNZoPp0NbwnXSKPea2bVUrKfsyXOW+08S/UXR7iZh8X7B/qpM5CqGzA7BDXrc2sM teDj2D+7JFG496DNL2Efmm3sASnk8gpFTPkZWwZ1FDg6URsSBT+LHIMvV3+3a0xUm87J nuuUO3qajlUkDFqb9D8lXch3el6RkLk2M9gI+JUPs+0npNWzJ4+8WlDmbiPkqIn9rllg 3xGg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=T5zzGU7rkqKqabRdTGdBNCQkm0jH6dpMGvRhTLzc/tM=; b=kVNCw1VAOe67KQW2v6m5Hy/zMZDcKh5vJenYa7H+jENrbInpvNimyuzj/ZRRk2dW4N oPvh4nK/LmgvnnSqbWcMJUtn0117l7soY/fxh8TdfUgii8HSfpLBC29+XLIbQDdZwuxg HTyf99jCLEfZe8542fpOzhLekEDH3mH+AyvN+ZsGJbpt4a0LjYWJZ/MvMF28kcIgnkVn ZCyLI7rl66cGFzwORix9LpioujqR2kGGLuSXob6y7QqEf8LuxLUq5oHOGiOjBi/425DY VaYHiVMp+4o3NJWqoo9QbU8suDpZ+ebF1k0hkQq4t3yL7Rfo9Tefx42IzO9lV69ruZbc 40MQ== X-Gm-Message-State: APjAAAXUGbIMu0ox49IOERPiWBBeKlYP8DLU9MbRTN1ni4ME8livh4O9 6/J1pDCD+jkLXtB5JQFVLQc= X-Google-Smtp-Source: APXvYqw2hMtALNhvmnysvjikCaYW0MGca08pBGmmXo7y/L9ipZsEXNTgKGCrDrtIuW68MAt10jdm9Q== X-Received: by 2002:a62:d286:: with SMTP id c128mr35441980pfg.159.1557162723420; Mon, 06 May 2019 10:12:03 -0700 (PDT) Received: from localhost.localdomain ([104.238.181.70]) by smtp.gmail.com with ESMTPSA id h13sm11045680pgk.55.2019.05.06.10.11.58 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Mon, 06 May 2019 10:12:02 -0700 (PDT) From: Changbin Du To: corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de Cc: x86@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Changbin Du , Mauro Carvalho Chehab Subject: [PATCH v3 25/27] Documentation: x86: convert x86_64/fake-numa-for-cpusets to reST Date: Tue, 7 May 2019 01:09:21 +0800 Message-Id: <20190506170923.7117-26-changbin.du@gmail.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190506170923.7117-1-changbin.du@gmail.com> References: <20190506170923.7117-1-changbin.du@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org This converts the plain text documentation to reStructuredText format and add it to Sphinx TOC tree. No essential content change. Signed-off-by: Changbin Du Reviewed-by: Mauro Carvalho Chehab --- ...-for-cpusets => fake-numa-for-cpusets.rst} | 25 +++++++++++++------ Documentation/x86/x86_64/index.rst | 1 + 2 files changed, 19 insertions(+), 7 deletions(-) rename Documentation/x86/x86_64/{fake-numa-for-cpusets => fake-numa-for-cpusets.rst} (85%) diff --git a/Documentation/x86/x86_64/fake-numa-for-cpusets b/Documentation/x86/x86_64/fake-numa-for-cpusets.rst similarity index 85% rename from Documentation/x86/x86_64/fake-numa-for-cpusets rename to Documentation/x86/x86_64/fake-numa-for-cpusets.rst index 4b09f18831f8..74fbb78b3c67 100644 --- a/Documentation/x86/x86_64/fake-numa-for-cpusets +++ b/Documentation/x86/x86_64/fake-numa-for-cpusets.rst @@ -1,5 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 + +===================== +Fake NUMA For CPUSets +===================== + +:Author: David Rientjes + Using numa=fake and CPUSets for Resource Management -Written by David Rientjes This document describes how the numa=fake x86_64 command-line option can be used in conjunction with cpusets for coarse memory management. Using this feature, @@ -20,7 +27,7 @@ you become more familiar with using this combination for resource control, you'll determine a better setup to minimize the number of nodes you have to deal with. -A machine may be split as follows with "numa=fake=4*512," as reported by dmesg: +A machine may be split as follows with "numa=fake=4*512," as reported by dmesg:: Faking node 0 at 0000000000000000-0000000020000000 (512MB) Faking node 1 at 0000000020000000-0000000040000000 (512MB) @@ -34,7 +41,7 @@ A machine may be split as follows with "numa=fake=4*512," as reported by dmesg: Now following the instructions for mounting the cpusets filesystem from Documentation/cgroup-v1/cpusets.txt, you can assign fake nodes (i.e. contiguous memory -address spaces) to individual cpusets: +address spaces) to individual cpusets:: [root@xroads /]# mkdir exampleset [root@xroads /]# mount -t cpuset none exampleset @@ -47,7 +54,7 @@ Now this cpuset, 'ddset', will only allowed access to fake nodes 0 and 1 for memory allocations (1G). You can now assign tasks to these cpusets to limit the memory resources -available to them according to the fake nodes assigned as mems: +available to them according to the fake nodes assigned as mems:: [root@xroads /exampleset/ddset]# echo $$ > tasks [root@xroads /exampleset/ddset]# dd if=/dev/zero of=tmp bs=1024 count=1G @@ -57,9 +64,13 @@ Notice the difference between the system memory usage as reported by /proc/meminfo between the restricted cpuset case above and the unrestricted case (i.e. running the same 'dd' command without assigning it to a fake NUMA cpuset): - Unrestricted Restricted - MemTotal: 3091900 kB 3091900 kB - MemFree: 42113 kB 1513236 kB + + ======== ============ ========== + Name Unrestricted Restricted + ======== ============ ========== + MemTotal 3091900 kB 3091900 kB + MemFree 42113 kB 1513236 kB + ======== ============ ========== This allows for coarse memory management for the tasks you assign to particular cpusets. Since cpusets can form a hierarchy, you can create some pretty diff --git a/Documentation/x86/x86_64/index.rst b/Documentation/x86/x86_64/index.rst index 7b8c82151358..e2a324cde671 100644 --- a/Documentation/x86/x86_64/index.rst +++ b/Documentation/x86/x86_64/index.rst @@ -11,3 +11,4 @@ x86_64 Support uefi mm 5level-paging + fake-numa-for-cpusets -- 2.20.1