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 5F29DC54E71 for ; Wed, 20 Mar 2024 02:48:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E7E2D6B009F; Tue, 19 Mar 2024 22:47:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E2D426B00A0; Tue, 19 Mar 2024 22:47:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CA79C6B00A1; Tue, 19 Mar 2024 22:47:59 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id B4B486B009F for ; Tue, 19 Mar 2024 22:47:59 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 8885B1204DD for ; Wed, 20 Mar 2024 02:47:59 +0000 (UTC) X-FDA: 81915882678.11.C0156EE Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2059.outbound.protection.outlook.com [40.107.244.59]) by imf28.hostedemail.com (Postfix) with ESMTP id 95D03C0003 for ; Wed, 20 Mar 2024 02:47:56 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=FPon9u0A; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf28.hostedemail.com: domain of ziy@nvidia.com designates 40.107.244.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1710902876; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=C9GGIoGjmeUJPaAjZEeOiAo2vr3u+5NsLCaIbzy946o=; b=JgB2Do8mMSJDwNAxrGtrdvFmEktaIAM9aVrwpUY0JRwy9ZEO5gagjmeCev3KC5s/LJZye9 5rEivyILxL8TAWPkeTiHQ0C4S7oIIzFYMQBenWULRVTnSNkK5OSyd33sSGX4FUYOuvSJfb fCgyA+a+Ks1BzUhxpaW+kG6byOBx0Pw= ARC-Authentication-Results: i=2; imf28.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=FPon9u0A; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf28.hostedemail.com: domain of ziy@nvidia.com designates 40.107.244.59 as permitted sender) smtp.mailfrom=ziy@nvidia.com ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1710902876; a=rsa-sha256; cv=pass; b=Op/3VqNFi3UNgh/OP8Xlidkt98zJ7rC9Gcf7WyGms3j1ebNjNIip/5PMKvoskdMTlDVRJK xXw+s+zw9XHVcKTeyfVwDup2EGE/VcY+oxrC4GTl5gnkq9VJEKG1Nf2QbkMdsWZt2aJihX TkzsX2lUZnegOaKAvJoo229focl3/0c= ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=g5ArIdLY6fM/EqjmzkLDzReGpqhDNVCVdbeeWT9QTDnW/0dwcxVTT6sqgElGc/rT/ILcAvmEhzgArZNphq7WJw4+Vip3n/IfVKbJmqn/xxYhj7ZztjPYjtX5SD+KVnrAiiGAfvK9WaJjzJbOR1pgx0cXaRnkxAzCi1a2qmoXJs9MmlyK14u1sdXZZHXtgmagW2EExF1EZESa5c7pn78lC/tKyvjsFv1IzGYj+q3gI63A68Km3yS5G+OnnyxukDEJMnsCmN61Lqw0I7FNcZPkKxZnFDrtAQcv3VlTaEUXagJPdrCZ12tCjqFH5VnAc4GI6EpoLms6NIF14V2IR+x2ZQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; 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=C9GGIoGjmeUJPaAjZEeOiAo2vr3u+5NsLCaIbzy946o=; b=A1zGIRwvZ02ugfdZanzMHhvxqTfBiRsyJpaewW+9ji4WexmC/z8ROaHHlve43blTTZTQv+KiL/0BIckFlGWuOpIwd0WCL4RWLsmUgAABGnKSml8/baWgDtTjZns2WdjiiJ9uKIv07OY3sQLnJfRs0clNt3o4qa2X3yqhb5yLmRV3K8ut7wFg3xm474hx+2e7nHj1s8LcpKeZShYYDQM9Zw8ywYotkruOSL6sqIisXsVmUMf4qZPpgQy+cx4WIyq3eDYjobCPY7QNMiNWCBlHDaVYhY9A5Use8NwauNum53zfaHqdAs3lzwelbj1FIAyqeXUubCOW1G3udX3o4mOYKQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=C9GGIoGjmeUJPaAjZEeOiAo2vr3u+5NsLCaIbzy946o=; b=FPon9u0AVMyskLJYi4WmP+7s2VpH07Iw4H+RM6db4OYhQV0shGL1AV++d2Bo4tjnZyrEkFrAULCJbRP8LSVkkaOlhTh1mpJ9Uux3lmkjpvf90d5d8PW31JTNSqeGvKH9Avu/OjyPpG6t2iV6PRvRSJC8OHNtXGQhWYDAx4L5G+Lrr4FpfhRCvVCqZ1yd1qmtkd345lnxJU756aD8Z6H9YIAzDJpPY7yOvWQF7RQvqm9odAqDj2Ss3t5m9QDSmi/PA00ibjnDEcSPeRI1tpG4vRTVBdBKKzGrrYCvQmbnvVCPgg3Vz87AnSAk3QWbNjziauizdbaiSgWj4tNdxYpWlQ== Received: from DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) by SA1PR12MB8724.namprd12.prod.outlook.com (2603:10b6:806:38b::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7386.26; Wed, 20 Mar 2024 02:47:53 +0000 Received: from DS7PR12MB5744.namprd12.prod.outlook.com ([fe80::dc5c:2cf1:d5f5:9753]) by DS7PR12MB5744.namprd12.prod.outlook.com ([fe80::dc5c:2cf1:d5f5:9753%6]) with mapi id 15.20.7386.025; Wed, 20 Mar 2024 02:47:53 +0000 From: Zi Yan To: Kaiyang Zhao Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, hannes@cmpxchg.org, dskarlat@cs.cmu.edu Subject: Re: [RFC PATCH 0/7] mm: providing ample physical memory contiguity by confining unmovable allocations Date: Tue, 19 Mar 2024 22:47:50 -0400 X-Mailer: MailMate (1.14r6018) Message-ID: <9D567EE7-45F3-4252-974F-6AF90CE6D635@nvidia.com> In-Reply-To: <20240320024218.203491-1-kaiyang2@cs.cmu.edu> References: <20240320024218.203491-1-kaiyang2@cs.cmu.edu> Content-Type: multipart/signed; boundary="=_MailMate_B015B720-F1DA-4BFC-AA29-49B1BE04AEFD_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: BL0PR02CA0055.namprd02.prod.outlook.com (2603:10b6:207:3d::32) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB5744:EE_|SA1PR12MB8724:EE_ X-MS-Office365-Filtering-Correlation-Id: 675a922f-ab20-4797-187c-08dc48882387 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR12MB5744.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(366007)(1800799015)(376005);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?Z3lFOGJBTEdNN2pPYXh0c1NKUldHRGp0NzZua2pUelk0ajRRbGJQQXg2MGl4?= =?utf-8?B?dGNuZDFKWDNXNSs5Ni9zVVgzcVNKSUx0a1FxWEhSdGNaRllvNHVSaUJ0N0Mw?= =?utf-8?B?QjFtcDdIbEJWQVAvemhRR1NuRHhZNTErWTZaTEoyQnBkWFU2bVpUL2F2eFpt?= =?utf-8?B?bUFSTXRRM0JxZ00yYnU1emZpYWxXWk9GWFhwQm1iOUJYSWF0N0MxSmpoOXFu?= =?utf-8?B?NGowNjZpTjNMemhTOFEyVHpvdlBTZXBXWGNiQ05sc1VXRlZjU3hURHBMeFNZ?= =?utf-8?B?b2JubFByd0ttMkZUV3ZXQ0MxbWtzQitCb212YzBXclFKMFBKQXNvdjllME9u?= =?utf-8?B?R21SSnJSOXkxQlk2aUZFSnVVZjNMSWFZTFE4RlJFR0h2K1Z0ZzFwLzFQMlBW?= =?utf-8?B?VHhYbk1ETFFWcGFhT2szQ21ERmNpTUl6SWxJL3AzRHczdWxJa2tRamd0bzV4?= =?utf-8?B?aEZtTFZJdDA1T3Vrc1FIbTRzUi82RmtaZ0xrcmZXeXh0V0NGbGpiVSttRWIr?= =?utf-8?B?ZzFOZmVycUdZUjRwbXVPLy80WTY4MEduaG03M0IzcDZ3ZU4yY1JmeVlNUFVv?= =?utf-8?B?RE9RUFgxZTdvN2NkdmFHbURNRTNVOG1tM1hNUXByNkNGdzAwbUd2eS90SUg3?= =?utf-8?B?KytZWVYwc0RJcUlDVDk2bGlUVWlqVFZMMFNab09GYng0R1BlOUhMaUVoTDcw?= =?utf-8?B?ZUpHbjhLUTlDY05VNXRsQlkvdUttUUI4Mi9KMG93TWVodnlFMy9ucjdZWVpk?= =?utf-8?B?cGdBZVlaaDlzc1dXd0Eyem9JUGRRYUtoYWhubEN1dWFENWJJaU5iSTBweE5s?= =?utf-8?B?VERwdHhpamxFdVJSaWYvMzVhakREaDRrUURqR2g5VzE5WVJJeVRqeS81ZXpU?= =?utf-8?B?ZFZ3Qzc1bkJURWllWkNqRFZjYUdJN0hPZ1ovbWVYVExkQ2tGNW44bEErbUVZ?= =?utf-8?B?QzFyNVJPT3Y0amJ3VXdtMFp5UFBjdEE5bkYzaE9JTURnYnJaRGRUbFNSdVVW?= =?utf-8?B?djVOOENQemFLR1JEdDFBQURWTGpibDFPczBxazc2eXNuSkdDaTNLQXd1Y1kr?= =?utf-8?B?NVU3UUdyYklFMCtZeC83WUNSTVMyTDM2alRad3RDdVgySitiY25nMDZRdU4x?= =?utf-8?B?ek1ESHhOWEtZa2VEVE9xbE1aNHQzZGVIb2doRWdyS2t6QksxcldGaDF5dU4x?= =?utf-8?B?TWFkdTZSbWpqUU1aZCtyWFhRRFVUVCs5L2h4M1VNOEEzeWVJWnlXTGVVRnZn?= =?utf-8?B?SHd4U1M1ck01NFMyaGhuQ01rL2M1STBESHF0aWVjZUVQY3pSb1R5d0VKcXpE?= =?utf-8?B?UjN3RXFONkJKUTU5YVZLa2lKRFI1VEtQeFVNNXZDbVR2Q2VKQkV4ZUp5UkR3?= =?utf-8?B?MldXUXR6Wi8rN21WSFRRUXJjaGlKYlJKMklHU0hsa3ozS0czNGdhdUIzRml1?= =?utf-8?B?RWsvd09tS1lKSWRhRlBNMXd6d3cvOWVKNVh0VHNWR1BuOHVUY1lXK0k4NU5q?= =?utf-8?B?eVQxbFd0a09HTEs4czN0QVVKU0pSZ3NMVkFyNXJDalVkYjROVWxXR2pwSDZJ?= =?utf-8?B?TEo2RHlBMVY3R0dvSHVsR05LZGJzWlEwUUluTXpMNGcvUEJJVjBIV0laV0Yw?= =?utf-8?B?K1V1OUY4d2E1VHpwUkR6REpGYzREejRhbDJPdVJmZ2FjbE1PbXltYWNyL0pI?= =?utf-8?B?NkdRd0J6KzBaRE1vaUdLRWxUb1NLVTB5TVB2VC9qaUNBMHU1NkwzZUkvQkc4?= =?utf-8?B?RkVKb1R1K0ZlWFNmTVRFWTE3Z1l1N01FeHBBQ2txWTZQajRFdnNDRU03OEtn?= =?utf-8?B?WVZRcUdSaFpmTVVEMThFVGZ2WVIzK2NzdUV4MGhvWW1FOVR5OWVqdE5ObmQw?= =?utf-8?B?UjNiTDN0dEhjTml4NFhacEl2alpsZUMwQk5EQ1ptQjlXRjIzOVZLNDdBamQ2?= =?utf-8?B?cnE2VU5ZeXQxcDR4MnJ4dUJzMlk0VWxYVkZyRFhxTVBndU5ocnBiSlZhdFk4?= =?utf-8?B?T29GbUZHemdHSHZqZ3NEM0x5UWpEakxDMnBQOWI1eHhYNkVVWVh2RjY1NElj?= =?utf-8?B?VnJvTmxtN1REanlOMnZTS2Jxd1pNRk9LR2JiR25iek94eDY3QzVtNjZmbUNI?= =?utf-8?Q?YAx8=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 675a922f-ab20-4797-187c-08dc48882387 X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB5744.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Mar 2024 02:47:52.9913 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: TfAW0RQ1aFJufJigQuWi81+jTLcO98pSpuRd1KYInwuFPke6xyK8mRsO+U/2l2lP X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA1PR12MB8724 X-Rspamd-Queue-Id: 95D03C0003 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: bwkn7dmur4n6uge3xwdfsf3idfz6aore X-HE-Tag: 1710902876-867704 X-HE-Meta: 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 xIfBrIMC 0PIvhh68X0co/1hExo2DhHCJxWr8JLm/sxEYr4mJloiLW2GPOi7uUwxMlURr+RRkxp4yvCattmCJS4WPLStu0oZX02mQ9vpqDZ8wboReejYTILGyzjBnik/YeWL8sNvzhb3FQXmtYzACfb8HZzSpEFKMm/ajlV8jLJF9Haw7NKnP8XoMA/qWL1q2bsac2fmz8Zj9O5YiaMl0jR6cte6qhNvjjdpO2qNeIxP7Xb6EPLI4AwGh27w/IWYoN8/Yl4iHd+LuOjsq5gYASLknnZKRtOsRgzjdEL2ziJjz121C/G2O7rMdu6ZshMaubl1F/q3YoVc71/0JOBkx9aO811YbPGv8Bvg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.007292, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --=_MailMate_B015B720-F1DA-4BFC-AA29-49B1BE04AEFD_= Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 19 Mar 2024, at 22:42, kaiyang2@cs.cmu.edu wrote: > From: Kaiyang Zhao > > Memory capacity has increased dramatically over the last decades. > Meanwhile, TLB capacity has stagnated, causing a significant virtual > address translation overhead. As a collaboration between Carnegie Mello= n > University and Meta, we investigated the issue at Meta=E2=80=99s datace= nters and > found that about 20% of CPU cycles are spent doing page walks [1], and > similar results are also reported by Google [2]. > > To tackle the overhead, we need widespread uses of huge pages. And huge= > pages, when they can actually be created, work wonders: they provide up= > to 18% higher performance for Meta=E2=80=99s production workloads in ou= r > experiments [1]. > > However, we observed that huge pages through THP are unreliable because= > sufficient physical contiguity may not exist and compaction to recover > from memory fragmentation frequently fails. To ensure workloads get a > reasonable number of huge pages, Meta could not rely on THP and had to > use reserved huge pages. Proposals to add 1GB THP support [5] are even > more dependent on ample availability of physical contiguity. > > A major reason for the lack of physical contiguity is the mixing of > unmovable and movable allocations, causing compaction to fail. Quoting > from [3], =E2=80=9Cin a broad sample of Meta servers, we find that unmo= vable > allocations make up less than 7% of total memory on average, yet occupy= > 34% of the 2M blocks in the system. We also found that this effect isn'= t > correlated with high uptimes, and that servers can get heavily > fragmented within the first hour of running a workload.=E2=80=9D > > Our proposed solution is to confine the unmovable allocations to a > separate region in physical memory. We experimented with using a CMA > region for the movable allocations, but in this version we use > ZONE_MOVABLE for movable and all other zones for unmovable allocations.= > Movable allocations can temporarily reside in the unmovable zones, but > will be proactively moved out by compaction. > > To resize ZONE_MOVABLE, we still rely on memory hotplug interfaces. We > export the number of pages scanned on behalf of movable or unmovable > allocations during reclaim to approximate the memory pressure in two > parts of physical memory, and a userspace tool can monitor the metrics > and make resizing decisions. Previously we augmented the PSI interface > to break down memory pressure into movable and unmovable allocation > types, but that approach enlarges the scheduler cacheline footprint. > From our preliminary observations, just looking at the per-allocation > type scanned counters and with a little tuning, it is sufficient to tel= l > if there is not enough memory for unmovable allocations and make > resizing decisions. > > This patch extends the idea of migratetype isolation at pageblock > granularity posted earlier [3] by Johannes Weiner to an > as-large-as-needed region to better support huge pages of bigger sizes > and hardware TLB coalescing. We=E2=80=99re looking for feedback on the = overall > direction, particularly in relation to the recent THP allocator > optimization proposal [4]. > > The patches are based on 6.4 and are also available on github at > https://github.com/magickaiyang/kernel-contiguous/tree/per_alloc_type_r= eclaim_counters_oct052023 Your reference links (1 to 4) are missing. -- Best Regards, Yan, Zi --=_MailMate_B015B720-F1DA-4BFC-AA29-49B1BE04AEFD_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmX6TlcPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUcgwP/R+9bOpWICo+zauS8zV2dNQralqdAPHfPnUO oxXNfXvbEN1Dh4Q5gNdV/3PwNhmotV9BBDgrkqx/4B98GKRboaUrv3YsQjeBQHjg UwPXqg6ODUnSn3t6l4j4GZtK9HPjBd1wUoO1wu0bpJKfU84N8nlfHlnNMWNHS/xW G2AfQTUl9TYg/B9j+8pWTo1EtpRlk8P+F9oVFbbWTnT4PJqhbwFD9GG2QjYSOM7Y t85FC01N3l5y2n4oeAl8RLP0CWt4bWWQ2ZjBx3vcRs30/ybKUqb7+TDzAwVDl1Lh 9vJFx98nAMWgQ81xYfdIU9UhbnAPjsdpRYkgFlludxkt9/YlPtcib9VKDZMHQGU9 L97lTzTag059F9NKLhX5GaSTk3q0I7Ep/VE3g2KI7zk3FLl2T1OM4mt9wQ3v22Zl Cb302OrPPcyIonLUy5deCWeNX1tmo9drp0PB43XfKKpdP5z/3E8Fc1qQC0JFCxSf LlNd6m8nUSjLxLDWuISVmjuzyw5SkUOdJtLAStDBqR25bWJEAP3Dx1rxS3zR3J6p 1TOou+D3vNQh6htnQc/YkIcrFt5EQ0xZOveQCv/KPzIpAic6aI8OOzvjEit+7Kj9 ku+cugymgjrKkNpF1mOUwRPijFCzpkh7S9D98ypig1b7lGOYTtRinbdQzcUsZ3Et Jf31uH4q =XQPZ -----END PGP SIGNATURE----- --=_MailMate_B015B720-F1DA-4BFC-AA29-49B1BE04AEFD_=--