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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D74FC677C4 for ; Wed, 11 Jun 2025 07:56:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D73ED6B0088; Wed, 11 Jun 2025 03:56:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D4B7A6B0089; Wed, 11 Jun 2025 03:56:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C3B506B008A; Wed, 11 Jun 2025 03:56:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id A7CF56B0088 for ; Wed, 11 Jun 2025 03:56:10 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 4D0A814036A for ; Wed, 11 Jun 2025 07:56:10 +0000 (UTC) X-FDA: 83542361700.20.BE82D6C Received: from NAM04-DM6-obe.outbound.protection.outlook.com (mail-dm6nam04on2069.outbound.protection.outlook.com [40.107.102.69]) by imf07.hostedemail.com (Postfix) with ESMTP id 61CCD4000B for ; Wed, 11 Jun 2025 07:56:07 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=RGbboJgu; dmarc=pass (policy=quarantine) header.from=amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf07.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.102.69 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@amd.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1749628567; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=aALBqwHK/RISEpIv2kcBscer4u16Zr9KGCz8vdbn/TY=; b=o65jVPWrl+jk9tjvK6BGaXyLlrutEBajOnUmUbCKi6UQf2m+xDx2wU50yMpzmi5t5d8d9R aW5hCl+2Q0/di4KJUFfpnfEuzwKtw7U08bbVaxMUq2zLYMwYkokMKeqlVbK6+gbyV+AR5R VNdMjcT4pi+tH2g7MbxH/6wRjoUfp2o= ARC-Authentication-Results: i=2; imf07.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=RGbboJgu; dmarc=pass (policy=quarantine) header.from=amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf07.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.102.69 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@amd.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1749628567; a=rsa-sha256; cv=pass; b=M3kUvj4tyuZOmrsOJ6oSYr7n1FB09GDQls1ujRPgYhPa5AeT8KLWTNwwBDk1tmACJQVufG I03VuwVslQUPCN2Nx2OupUxy+xoa/K0awKtrz01pue6Hp4d8dCmy264+N42ZoGWrE6YJ5b TgiPQR1fQYd4JFvDEwNkQp0TtTxLztg= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=NJs1XDHrEp1uOVGkXHYfiVMIp+tqBNTdt562pctWi+HisCavnxxGXR1YtAEzMAx7w+TzbFFZLwHFt92hAmZHf70eZ+ofQfL1THjlw1YI5ZY9c03bHKDvATiyF14+2q+PmEMRfcTpC33I/sFfbX/OuiVEJYyz60DSuACeqfbvVkdQGC/YtgoQswRT6iz5T7pbmW4/uwo0hsYSIEXtXB3hjT0gOrNAscdp8KP5xKJ8bFxpswcHv3N3W6u7nZkIymRTqwUEy/Y1jQVFQG8s992yJhIfXJ/PCetq1qlrHxsyZxg9FrTTnqGf6TKBAv5pJ9BtQf8GnnlY4ljrVsqniv6dmg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=aALBqwHK/RISEpIv2kcBscer4u16Zr9KGCz8vdbn/TY=; b=yh63Iqv/tjKtA/52XuOeUiXbsaB5yTg3XsR9QTRemFmpa8Y2zwu8s7gJH9mxNV4lzPXgizhRu0ZCbf7f7g0Wd3canx6X8kDW8MNKXCqhOe9NsEVpNaIpdPbx/AVj1bhnFzuRx/zHcSGRygSRLJHy8Ccl9zSxNopnT+molD1sKEwwI8qGB0YzQ4br1SF5/HkIZ+Jj8igd6xNl/v7QRJz3QNVw3kIlLNjBc5DLgxcvy2WG+Mr80c8YZcZnTJhkysYAg5TAmpaGL0UG3FEbUG1mtROTFYQjnKkv6mawVuvnDbfC1Q3dZdDqis2rKOT4kOgHi2fXRpp/t+O6mYAc5dnjDQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=aALBqwHK/RISEpIv2kcBscer4u16Zr9KGCz8vdbn/TY=; b=RGbboJgunzM0KHm8H6chrz5i1XcZ+MQ/E1LW7YG/JkKgmCiTdsjlF30PlGO4e8/7aCKaX2LMAXL+31CLpDPV4DLW0jq5VQjYZEyjNjLCk8XwOdZjUseE6OY/xeT3/XQP6lFoLbCnTLjCwTM/W/U7UXbvuFJ/2Krq6NMAkpocEqs= Received: from PH7PR12MB5805.namprd12.prod.outlook.com (2603:10b6:510:1d1::13) by CY8PR12MB7660.namprd12.prod.outlook.com (2603:10b6:930:84::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8792.39; Wed, 11 Jun 2025 07:56:05 +0000 Received: from PH7PR12MB5805.namprd12.prod.outlook.com ([fe80::11c7:4914:62f4:f4a3]) by PH7PR12MB5805.namprd12.prod.outlook.com ([fe80::11c7:4914:62f4:f4a3%4]) with mapi id 15.20.8792.034; Wed, 11 Jun 2025 07:56:04 +0000 Message-ID: Date: Wed, 11 Jun 2025 13:25:55 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH] mm: Drain PCP during direct reclaim To: Wupeng Ma , akpm@linux-foundation.org, vbabka@suse.cz Cc: surenb@google.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, wangkefeng.wang@huawei.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Nikhil Dhama , "Huang, Ying" , "Rao, Bharata Bhasker" References: <20250606065930.3535912-1-mawupeng1@huawei.com> Content-Language: en-US From: Raghavendra K T In-Reply-To: <20250606065930.3535912-1-mawupeng1@huawei.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: PN2PR01CA0176.INDPRD01.PROD.OUTLOOK.COM (2603:1096:c01:26::31) To PH7PR12MB5805.namprd12.prod.outlook.com (2603:10b6:510:1d1::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR12MB5805:EE_|CY8PR12MB7660:EE_ X-MS-Office365-Filtering-Correlation-Id: 0483d3d2-05d3-4be2-e31f-08dda8bd6a3b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|7416014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?UWkwMFVaMEo4VHJST09pcnhnSmFkREp4UFcvd0NaV1JJRE1iOVBHdmd0aUtC?= =?utf-8?B?MVpkMTl5YU5JQWtVNDBMRWxNSEVWejJHV0x3ejgwTWwzWEFRRFU1QnZ1N2dQ?= =?utf-8?B?cjdOVkE2WTZxNEFmTE9jMnZzdGNjc01NMUd2RDBubEM2WGVYZ1J0OUpoeTFn?= =?utf-8?B?bG9aVm1aaDY1Q1pETjNVT0RIODZWb2lqSDgrdDJGL3pRV0lneWJaTDM5ZnN3?= =?utf-8?B?emhEZ2tLZlZNcXAvZDR3STY5Mjd3cGU3bTBpUlNkVGo0WHBnbjU2c3I2RjBh?= =?utf-8?B?K3JoLzdWSm9JWE11ak5kYUhYa3BzVkV3Sk1pSVYrdTRBWWh5dGRZSU9BQUdI?= =?utf-8?B?ck5NMkxqd0g2YlhBK0RWdkljY3JnUHBPcUV2NzZmZERKYXYxbHVGQ3RuWkRm?= =?utf-8?B?R2tTUmxDTjhmMm43TkZYcG4rTjY4bWNVSFlxdk05ajRxMG1BeSszSUpMaUxp?= =?utf-8?B?L3I1T1A2LzVRc28waHJMemlBdUpZam4xeWJ4M0hGSzZhdWQxa2xwbXRpNHZo?= =?utf-8?B?WWZoc1djNDhzR1VWU0NFc2JDQXU0VmNZaXBXamZhdG1sMndXekMzV0c0ZWZC?= =?utf-8?B?L3p0dnJ2WWRhVXBEN3JLQ3JjeEpxTTFoVVprNTBiRFI2eS9rWi9yM055SHM0?= =?utf-8?B?NTFESnp2cnpPbEVicndHdEZYMEp4aWNpaXczTzFSblBNRWRoeGF4d3cvekk3?= =?utf-8?B?dyt0VHFXZG95MDhiUjRnTmFmckw3NnRCYkZrZzZBT0lsYUpXMTEyTlAwZkRB?= =?utf-8?B?U2RTY3pmODZIN2JqdUpKYm4yREMrdjk3SytqMHdNSGtiamtnYWF4YUtsazdh?= =?utf-8?B?ZXE1cnBjZHhleUFkR2FQVVZta1BJdFVmMEd6YXdrci9MeGJwdWlJZG1FTXAx?= =?utf-8?B?enNtNUpnMXpHallKN0ZXUmh3QUc1YmZKRHJrMDZQQ3FvNEYzN1Q3dElpanBF?= =?utf-8?B?MzVKWDY2VGF3ajNVWitoNjFMZVd0bTh5V3FCTUtoKzRhUU0rWGRqZHVyL2da?= =?utf-8?B?enZMSyswRnR4MG9sL1JDQzJrbXFVN2Q4eC9HaXdvYm1OZGJ1eW0zOGJLQ1A0?= =?utf-8?B?VURjazVvVDBlcnY5QXhYM21WM3Mza2pCZFQ3S3BrTTN2em04UjdHNnhlMEZK?= =?utf-8?B?YWlzbHRqYmczVG9IdThOeTdGbExnL1hPVENOd205dHExa3l4UndvYU1DTFVo?= =?utf-8?B?alRIMUhrZXpYWk1CbTVyaHovNGd4K0V2YmxjSTIzNy9ERnZxNTlhUzljTm00?= =?utf-8?B?dThKQXpnOWxFTEdmNVk2a3JneEpZMWcxYnppZHVHR2lzQ0w1OURvdDd3U1U0?= =?utf-8?B?UExackNLUDJBbXlVVjRWem5sVDRScVQzNnlrUlVIeGhqU09xRE5SMTA1WE1u?= =?utf-8?B?a1NMWFprb05TNXFPVGZlQ2F0SlY2VVArc01maysxRkZNeDBReEQxRTFSQ3dL?= =?utf-8?B?Q2h6aDhrOWd2UEIwdysrNWVRakFRM2w1TU1KYlBaQ2JnWEVnMG9CQ00wSzlB?= =?utf-8?B?U0RjTzFFYXg4emJnQWk0Q1ZnQTNZVVdrU0x0aHNZaVlmWVlNOEg3cnJNQ2Fy?= =?utf-8?B?MG5lYk5TVGJLb0MvcFVXdm1tUXg4bDZJcktHcjlXeUd0ZXlKQU5HV2pwazU1?= =?utf-8?B?WEdnMFFXVERlM3lERys3RGlNZndvekVmOTFoSE5ieHdmdjdOUmJ4RDA4eW0v?= =?utf-8?B?ajZtM0FOVGVpRmtoM2wwdER2ekFVWXhiajBITHBaekd5RmNDaFRaVVdNNGdL?= =?utf-8?B?Wk9PR2NSN1VPSmt0RG9QemREZDZBQUFudVVZK3VpQ2gzanVCVDdwSUJLd3NH?= =?utf-8?B?M05DclF0eGcvYVBXbEFoTVpKeVVQZU1UNHJ0MGtsWlg0VXVVdGplNHlPeCsr?= =?utf-8?B?MXJLc0NwMlRTZ2tnc1J6WlYrR082aDY1SDI0blVYc3dzL3VsRENsTW96dWcw?= =?utf-8?Q?SfBvA9/NFK4=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH7PR12MB5805.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(7416014)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?M2lwSGVoWTFUaC9Xc3RGQ2dYTXFWZGdZRmkyY3Byd2RjcFR1VXJ0RjVjUU9J?= =?utf-8?B?a1hia3hab3BlMkJOaUlzRnFyZDk1MTVXVk5HdHA0ZTcvWHpKT1RoZ0R1YjQ0?= =?utf-8?B?eW1lUGFwRkxkQWJCSHpCdytSczVVelVROGFOYVlqY2N2WEc0L1JvdVhXeWhO?= =?utf-8?B?WHVlQXR5VUxId253cjVJeDZucitGSnlRdVJ2NExzZThCbjVvMU5QUnpJMndS?= =?utf-8?B?YURHMVl6RHFESXlSUVdzT1BDYldSVE4xU1JKc2VQMzJVczZ3enh3c0ltS0Vx?= =?utf-8?B?WSsyUkZQSXE5aXdjZHNaVk15eEtibytjUUtNWUxqd1JxbXJsQ2lxalo4TDYz?= =?utf-8?B?TmZJTlljdVFtZmhiM3pwc3JDQktNSkRWMjhsSk51Y3Z3Y2FqRlh4M3IzTWwr?= =?utf-8?B?L3ZWZm1Dd3BHV2RlNWZoZFhySGtzREhQZE9JdVVnaWwyMHlUYnlNSEVLMGI1?= =?utf-8?B?YlUwQ0NkZ1VkS250NnFFTVpLQXppQVFXRlBSeVdpbmRhUUJQd0NPWUZCWnpj?= =?utf-8?B?UnRYVFlXNlc0VGFJVzRPMVI1clBWbVNRR1JPTlRYNDluL0l1M1BxV3VJTUR1?= =?utf-8?B?eG1GWHcwNHNLZ3c4NGZUWTBtVC9LRlJ4Y3FtalJPdkYzd0pHSFRXOFJ3dStM?= =?utf-8?B?bXVTYUFTb1JlcDU3ZmpFcndaMTJjTFloZzdNekRJUFlCeEVGSlZ1NlY1VCtS?= =?utf-8?B?YWxYN0RuZit3c1Y1VmhzeVZmdUY0OTROSVdpKy80ZENhRGdSemNuRlZoMWxu?= =?utf-8?B?VWlTa3EvSUlqMDZFZEphMVlTTkdMb2FZVTFUc2ZZaU1kYUpHUTcyTjd0aloz?= =?utf-8?B?aHVUVGVSOUZOYkRJZk1ncXEyMVlJdURydkJscFVPV2JIU3ZuRjFLKzc0TEJC?= =?utf-8?B?R3FmNktpVExhYmdBMHplUkVCOVNDWVgvRkJ3bzQreWhxbFI2YUlMa1piUEMr?= =?utf-8?B?eER1akJLelFLWm9XUTVGYVl2SzlFOWR2RUJQYWhudS8xaG05b0RIUVM0dDlI?= =?utf-8?B?Nlh2QTFLM244QURiUE9NSzMwOVJsT2ZRdWU3ZTg2M3dZM3E3VEs1bGpCcjhL?= =?utf-8?B?MDF2dFp4WDVIdVBaRG5DSFBtOGdRb09aSVRtMDJibUFBZ09OWjBVT291c3VY?= =?utf-8?B?eWQ0QVBsbktwNmhkdHZmeUF0OUlZSmF6emV1UU05LzBUU2JJdlhsL2x1R29w?= =?utf-8?B?c09VNU5xYzhlMFdqdWhhdVFMVTN2a0dpNDhNc3k0Y21YTDdOOHJxK2tncjdx?= =?utf-8?B?Rjh6THNENTNtYmxQTjUydHh2U0dMVTM2RmZBLzNCUXFzbmJPOXc3bXJsL01J?= =?utf-8?B?U2p2Sk10MkNKdmpydlNEaVpXdUdtYlpyQjFGZ1JRSXZObUdTcktUSk9vdzZS?= =?utf-8?B?NEMzU3FydzB5RUh0YWM3WmNuaC9vSDBJRlhlYzR0TXp2UDhmaVVXMkpiQ1lj?= =?utf-8?B?YXprZHZBKzFCRS85dWxRWFU4Si92WFF6c29qZVBFby9kSXJ6cTBHYnU2SWNL?= =?utf-8?B?TDNRT2hUTjd6NllFdUFSS21LQ3dRemhBdTZQaGFxOG0vS1pTK2tDVzhkY1R2?= =?utf-8?B?ZlNHN1ZxSGFWSkxmcElMZk5MbUVNTHpscVIzRjRrZjBSY2h4NXVWUjQzcFE1?= =?utf-8?B?Y01nUUJ5a3JUSlgvZmdtOEcrNUVoMnNaQlBWSUkwM3IyTG9zeCtEQ0tnUDd2?= =?utf-8?B?b3BOc2wrZkpWaFBIM2I5TmNxaU5maHBiQmNyQlFEVjhxaEdReklBSzN6Vjhv?= =?utf-8?B?WGpmTENheEhYZ0FWa3Z0Q1hOdGxmZFMzcUpWQVU0U2d4VlNBdGRIVGc5WE9V?= =?utf-8?B?V0ZYbVNQTy9HcDdPR0pLMmNNS1FJTEtubTdlRW5TbE12V3ZzSHJNV1JPdXlt?= =?utf-8?B?bzJuOTM0OWZZQ1FIOTFtaHd0QjdQOVF1N0V1YkV2V2RJKzdmZ0hlU1VBeWVY?= =?utf-8?B?RFE2ZDBxUEFVK0VVVndKSkE4Wk5qTVFDOE0veW8xMjJtSGlucnZ0cS95Q3Vt?= =?utf-8?B?Y1c4ZHVRc0swTW41VjFWK29vR1pqVllDSkFObG84MGtKaEt4RTJmZEdXSFNa?= =?utf-8?B?QUhJTnlRWVVWNjBITDJPMDZCM25UQy9FelZWTDZDeVk4VnNabDdnMlFJeWdW?= =?utf-8?Q?t857E6JXETtghr5q/raknd6h1?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0483d3d2-05d3-4be2-e31f-08dda8bd6a3b X-MS-Exchange-CrossTenant-AuthSource: PH7PR12MB5805.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2025 07:56:04.6876 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: VtahwOjlr1RbqZcxnWc0pb31Lq3nv+zB2oiic0uzpqKHvwDDxBvNV4BqRvdRKspJxkaP7WLSXG1ebydePTafbA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7660 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 61CCD4000B X-Stat-Signature: bdupg7jh5kyd6opjw3g1eci7g5xnaatx X-Rspam-User: X-HE-Tag: 1749628567-267977 X-HE-Meta: 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 x9M/XXeF 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 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: List-Subscribe: List-Unsubscribe: ++ On 6/6/2025 12:29 PM, Wupeng Ma wrote: > Memory retained in Per-CPU Pages (PCP) caches can prevent hugepage > allocations from succeeding despite sufficient free system memory. This > occurs because: > 1. Hugepage allocations don't actively trigger PCP draining > 2. Direct reclaim path fails to trigger drain_all_pages() when: > a) All zone pages are free/hugetlb (!did_some_progress) > b) Compaction skips due to costly order watermarks (COMPACT_SKIPPED) > > Reproduction: > - Alloc page and free the page via put_page to release to pcp > - Observe hugepage reservation failure > > Solution: > Actively drain PCP during direct reclaim for memory allocations. > This increases page allocation success rate by making stranded pages > available to any order allocations. > > Verification: > This issue can be reproduce easily in zone movable with the following > step: > > w/o this patch > # numactl -m 2 dd if=/dev/urandom of=/dev/shm/testfile bs=4k count=64 > # rm -f /dev/shm/testfile > # sync > # echo 3 > /proc/sys/vm/drop_caches > # echo 2048 > /sys/devices/system/node/node2/hugepages/hugepages-2048kB/nr_hugepages > # cat /sys/devices/system/node/node2/hugepages/hugepages-2048kB/nr_hugepages > 2029 > > w/ this patch > # numactl -m 2 dd if=/dev/urandom of=/dev/shm/testfile bs=4k count=64 > # rm -f /dev/shm/testfile > # sync > # echo 3 > /proc/sys/vm/drop_caches > # echo 2048 > /sys/devices/system/node/node2/hugepages/hugepages-2048kB/nr_hugepages > # cat /sys/devices/system/node/node2/hugepages/hugepages-2048kB/nr_hugepages > 2047 > Hello Wupeng Ma, Can you also post results of iperf/netperf for this patch in future? Thanks and Regards - Raghu