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 93366C433F5 for ; Wed, 13 Apr 2022 09:22:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234396AbiDMJZF (ORCPT ); Wed, 13 Apr 2022 05:25:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234378AbiDMJYx (ORCPT ); Wed, 13 Apr 2022 05:24:53 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6F17552E5B for ; Wed, 13 Apr 2022 02:22:33 -0700 (PDT) Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 23D8fnt5015860; Wed, 13 Apr 2022 09:22:30 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=DC90fePYOoCr+3ib3Y1j/qpFHxLAIQ/hvFvZPCUiPLM=; b=LZztJFQkhVDpUpW5WhYo/PC/SZs0ezbBUQQ4L5P8kSgsLTvWr0jsPtOw+f4JyR8vUMYx zcwVW3Un8o0NJv1v+0KYZ0hRfAMbLtmDg6Z3+2tIJphU//m7FKFFtZIieYCikslHuEUy MeKQGdaMKTx9jxAj99iqM6rP0vO3X3U5ua1fqry8XBcvvCfkPumT7ALSLJKTrKTlWgpI HyYemXs1l0Y5ZmSGC1TK83lw+nqJ2R9PiT49b6tcICJf0FbAgRQXkqKkJb76JIojAosH 1a3SgU46B93cradmujMKhHD/4sCkJ6EveF1tWsv0cLnuHSjPhMd7TwlR12FzqAe6M1DG WA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3fdu7sry95-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Apr 2022 09:22:29 +0000 Received: from m0098393.ppops.net (m0098393.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 23D9MTPh017708; Wed, 13 Apr 2022 09:22:29 GMT Received: from ppma06ams.nl.ibm.com (66.31.33a9.ip4.static.sl-reverse.com [169.51.49.102]) by mx0a-001b2d01.pphosted.com with ESMTP id 3fdu7sry8g-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Apr 2022 09:22:29 +0000 Received: from pps.filterd (ppma06ams.nl.ibm.com [127.0.0.1]) by ppma06ams.nl.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 23D9KGRa030806; Wed, 13 Apr 2022 09:22:27 GMT Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by ppma06ams.nl.ibm.com with ESMTP id 3fb1dj6fm3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 13 Apr 2022 09:22:26 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 23D9MOCX33620248 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 13 Apr 2022 09:22:24 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E2FEA4C046; Wed, 13 Apr 2022 09:22:23 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 901474C044; Wed, 13 Apr 2022 09:22:21 +0000 (GMT) Received: from li-6e1fa1cc-351b-11b2-a85c-b897023bb5f3.ibm.com.com (unknown [9.43.51.146]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 13 Apr 2022 09:22:21 +0000 (GMT) From: Jagdish Gediya To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, aneesh.kumar@linux.ibm.com, baolin.wang@linux.alibaba.com, dave.hansen@linux.intel.com, ying.huang@intel.com, Jagdish Gediya Subject: [PATCH v2 3/5] mm: demotion: Add support to set targets from userspace Date: Wed, 13 Apr 2022 14:52:04 +0530 Message-Id: <20220413092206.73974-4-jvgediya@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220413092206.73974-1-jvgediya@linux.ibm.com> References: <20220413092206.73974-1-jvgediya@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: hdHHjqQxSQNPifr7Z18VkAsJBt2ofxx1 X-Proofpoint-ORIG-GUID: Hw1mFgL-SDpAqea-jpyTjfCTiBnzxBM9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-13_01,2022-04-12_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 phishscore=0 adultscore=0 mlxscore=0 clxscore=1015 impostorscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2204130051 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add support to set node_states[N_DEMOTION_TARGETS] from user space to override the default demotion targets. Restrict demotion targets to memory only numa nodes while setting them from user space. Demotion targets can be set from userspace using command, echo > /sys/kernel/mm/numa/demotion_target Signed-off-by: Aneesh Kumar K.V Signed-off-by: Jagdish Gediya --- .../ABI/testing/sysfs-kernel-mm-numa | 12 +++++++ mm/migrate.c | 35 +++++++++++++++++++ 2 files changed, 47 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-kernel-mm-numa b/Documentation/ABI/testing/sysfs-kernel-mm-numa index 77e559d4ed80..10e9e643845c 100644 --- a/Documentation/ABI/testing/sysfs-kernel-mm-numa +++ b/Documentation/ABI/testing/sysfs-kernel-mm-numa @@ -22,3 +22,15 @@ Description: Enable/disable demoting pages during reclaim the guarantees of cpusets. This should not be enabled on systems which need strict cpuset location guarantees. + +What: /sys/kernel/mm/numa/demotion_target +Date: April 2022 +Contact: Linux memory management mailing list +Description: Configure demotion target nodes + + Page migration during reclaim is intended for systems + with tiered memory configurations. Preferred migration target + nodes can be configured in a system using this interface, based + on which demotion table is prepared in kernel. If demotion is + enabled then pages will be migrated to set demotion targets + during reclaim. diff --git a/mm/migrate.c b/mm/migrate.c index 516f4e1348c1..4d3d80ca0a7f 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2564,12 +2564,47 @@ static ssize_t numa_demotion_enabled_store(struct kobject *kobj, return count; } + +static ssize_t numa_demotion_target_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + return sysfs_emit(buf, "%*pbl\n", + nodemask_pr_args(&node_states[N_DEMOTION_TARGETS])); +} + +static ssize_t numa_demotion_target_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *nodelist, size_t count) +{ + nodemask_t nodes; + + if (nodelist_parse(nodelist, nodes)) + return -EINVAL; + + if (!nodes_subset(nodes, node_states[N_MEMORY])) + return -EINVAL; + + if (nodes_intersects(nodes, node_states[N_CPU])) + return -EINVAL; + + node_states[N_DEMOTION_TARGETS] = nodes; + + set_migration_target_nodes(); + + return count; +} + static struct kobj_attribute numa_demotion_enabled_attr = __ATTR(demotion_enabled, 0644, numa_demotion_enabled_show, numa_demotion_enabled_store); +static struct kobj_attribute numa_demotion_target_attr = + __ATTR(demotion_target, 0644, numa_demotion_target_show, + numa_demotion_target_store); + static struct attribute *numa_attrs[] = { &numa_demotion_enabled_attr.attr, + &numa_demotion_target_attr.attr, NULL, }; -- 2.35.1