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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 56A6CC982D8 for ; Sat, 19 Sep 2026 17:09:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F0F5B6B0088; Sat, 19 Sep 2026 13:09:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EBEA86B008A; Sat, 19 Sep 2026 13:09:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D87C26B008C; Sat, 19 Sep 2026 13:09:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id AE4916B0088 for ; Sat, 19 Sep 2026 13:09:25 -0400 (EDT) Received: from smtpin02.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 1A9AD1202D1 for ; Sat, 19 Sep 2026 17:09:25 +0000 (UTC) X-FDA: 85231147890.02.741BF69 Received: from YT3PR01CU008.outbound.protection.outlook.com (mail-canadacentralazon11020110.outbound.protection.outlook.com [52.101.189.110]) by imf27.hostedemail.com (Postfix) with ESMTP id 1411540002 for ; Sat, 19 Sep 2026 17:09:21 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=efficios.com header.s=selector1 header.b=HmYTbPF3; spf=pass (imf27.hostedemail.com: domain of mathieu.desnoyers@efficios.com designates 52.101.189.110 as permitted sender) smtp.mailfrom=mathieu.desnoyers@efficios.com; dmarc=pass (policy=none) header.from=efficios.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=pass; t=1789837762; b=ho3njYxmmSVnWqB4mBx5AyOCKZd+hY/lZZKuyDIC1w5tEjWWZl+YGsW5kwqFCcIOdDw4Ps r4Gt+pv5pu/H9Ni+en0PZuLEQe5FkjdktqFGEVLi5b33de0tGAk0AvDgcOZcBNoXoXBo3z lb7ycp3SLgS3zUbA7bth8BpCSxRYjvs= ARC-Authentication-Results: i=2; imf27.hostedemail.com; dkim=pass header.d=efficios.com header.s=selector1 header.b=HmYTbPF3; spf=pass (imf27.hostedemail.com: domain of mathieu.desnoyers@efficios.com designates 52.101.189.110 as permitted sender) smtp.mailfrom=mathieu.desnoyers@efficios.com; dmarc=pass (policy=none) header.from=efficios.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1789837762; 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=AyrJjfD0MFLSHkXRljLFQDy1aeMnploAGEOY/W11zLw=; b=UiQb+jdjKhdIWj5kMd3JzQRfhQcEog/va8ed1wQHQI5/76RsSaCRmee7LGoDW1iiYDJTDv eB4HDM7lZ7ujJd+brF2kCKVP35HzP1TQguIRHVOmdhH3Dryzyh3Whg4nOpIBxNopM9EZv/ 8Q+pyBnTq1O5h94FeL1So7Nm6zgtkEs= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Xtg6uoY1IGKsgYjXbAWOZnvx8HczVA4kzbbczCRroIIPtPGFTl8HhmnS4kPpNtg13vwEvtrXB6ZEymuQCHMeyLvJ/hl3LOd9T/zELmRGREkGZ9+9T/Q4pedfpyGL737V36tglPFsIQMe8YpjCEG3d/rBfIXK1nFYpZE4CoY2v0tUUb+mXPrqo1kTEvz71pR0tKSpJkYUsq+WyXCgkzijruoTjqP7qrylVTCb1PV5INx8ohJvzZyO976RVpx7a1XB9IObAv4hqkO24sWEdXSQiZSmXJU3pOXMAkZ2UN5gmoCMlMeSUFTsyOueJ1n5Jwe3cy4mooUYd+jjXBX5IKFtpg== 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=AyrJjfD0MFLSHkXRljLFQDy1aeMnploAGEOY/W11zLw=; b=efv53u43/kmji/aDrs+2Iywbk8hUp9RwOj0u4x5A6PxalaLvDCiAGHSKcpmDi3C2QHtMAdS5/e/hOlOGWfkCgxaPDaZH4JHED2t0gLF5C7s1bHxd6nmePZbCjAWbVXcNF2aF0xKczFOL9K3gQ862olepHnQDnGMHhwhIbf91OEVulHNyjPgAjs7ryO794hTyoVGJSuNDlFIboMRPIK/+Uuc7NSEWgUv0tVTPQSVbQXpFE0jXWPg0Oa6IpK0HwfWjR/H2U9g1De2cupJ0dc2oqXwRpXOG/3ocCCTrfU+bVpjEuV1ggC9bm5EMLbGAbcDlhpWIvdpBU4v4IsFlMFj9Gw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=efficios.com; dmarc=pass action=none header.from=efficios.com; dkim=pass header.d=efficios.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=efficios.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=AyrJjfD0MFLSHkXRljLFQDy1aeMnploAGEOY/W11zLw=; b=HmYTbPF3z0mcVYvqPNGTnTrFx8CvRRhwwxR8BL6tNHop4MmrWRoR5OV9Y3DL7W4LoPvm7JlppiuGV0rN17u2f9IoXqYDiFGHGgbhMuYjChynvEwLk2vmz4dfOppqFDuTFBW1V6JYZ3oy0tD5Mq4GF1vjtQ/8jWYboI4Sjh7c9slIYDQ63bdSYuVVGS11gFi0c7JB9vWnlUk41teYCd/g5xyOWr9GyJ3icOAmb7BIqn0N+wln46w31eB/Etvsi2gVevA/qq95jRC+QDfpMeyJwcCy9q1xsKoPc4iQuav+ikcJ8zTewi5AsshJwln2zf74NMwYvakXNBV+WETMCaJFDg== Received: from YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:1d0::10) by YT5PR01MB324718.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:1a0::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.428.14; Sat, 19 Sep 2026 17:09:18 +0000 Received: from YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM ([fe80::6b9e:a901:67c5:7ddc]) by YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM ([fe80::6b9e:a901:67c5:7ddc%6]) with mapi id 15.21.0428.014; Sat, 19 Sep 2026 17:09:18 +0000 Message-ID: Date: Sat, 19 Sep 2026 13:09:15 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 01/28] hazptr: Implement Hazard Pointers To: Linus Torvalds , Bradley Morgan Cc: "Paul E. McKenney" , rcu@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, Boqun Feng , Steven Rostedt , lkmm@lists.linux.dev, Zqiang , Wang Lian , Kunwu Chan , Nicholas Piggin , Michael Ellerman , Greg Kroah-Hartman , Sebastian Andrzej Siewior , Will Deacon , Peter Zijlstra , Alan Stern , John Stultz , Andrew Morton , Frederic Weisbecker , Joel Fernandes , Josh Triplett , Uladzislau Rezki , Lai Jiangshan , Zqiang , Ingo Molnar , Waiman Long , Mark Rutland , Thomas Gleixner , Vlastimil Babka , maged.michael@gmail.com, Mateusz Guzik , Jonas Oberhauser , linux-mm@kvack.org References: <20260919000056.3132131-1-paulmck@kernel.org> <6B1FC39D-6EB0-433A-8E49-E5EFC9379AD7@mainlining.org> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: YQ1P288CA0018.CANP288.PROD.OUTLOOK.COM (2603:10b6:c01:9e::20) To YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:1d0::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT6PR01MB491026:EE_|YT5PR01MB324718:EE_ X-MS-Office365-Filtering-Correlation-Id: c841ca50-54df-48f8-5fd8-08df1670bd88 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|10070799003|366016|1800799024|376014|7416014|23010399003|4143699003|10067099003|56012099006|5023799004|18002099003|22082099003; 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:YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230040)(10070799003)(366016)(1800799024)(376014)(7416014)(23010399003)(4143699003)(10067099003)(56012099006)(5023799004)(18002099003)(22082099003);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 2 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?dVNIaEVBeTBwNHo5MEI2TE5najhER0pYZ3o5OTRQRGY2L3AveEZqbEFBTUt3?= =?utf-8?B?YWNLazU4VGIzaG1KNTdDdk9vQlFSYWlhZklFMlllQzNtL1Y5NFRGQVk0VHc0?= =?utf-8?B?SVc3Mlp0U1BQOFRSN1lCRXdkaFNPenFvV1BEMUlWaHRQNFM2a3NGbVpmeU8x?= =?utf-8?B?YysyVExSOTFqVy9kY1hVakkxV2cwTEdpSGgyM0VpenVSLy9RV1dPbzMwSlYr?= =?utf-8?B?TmlNcm5FMTFTUDZta1BZTmxhMFlQcFo4ZzdvejZtK0JmeTVZNWNkcW9mNHhi?= =?utf-8?B?VFhtSVk1TzJIUEMzK09QaXN3UklicnFoN3NYclZuYmhHSWQxVDdvZkEwMjNo?= =?utf-8?B?RkNuRG1QM3MvdTI1eUNOL1VhVU9PM2xpclFpVCs3SFhlc3hEeTBVOWRkQlZM?= =?utf-8?B?QkZkdVpTL0tUNzQyclFMWVgrNzdiN0Z6M3kwelRJK1JlejNJRlVNNlcwbTBQ?= =?utf-8?B?Zk1pVWF5THYyeGc1V0JUcTdvb0xMemNidThabVZoVzF2aVB5WVMzNCs1WkFi?= =?utf-8?B?dzNZQ0JnZmpWckxyUFNvQ0JSL0FFRnhWM2tlOW1DeWVBSDVLQ3RYRUxEMWtH?= =?utf-8?B?b2tLVldMMTJtYit0NmFXenpFTUxFNTY0QkJMS3lweS9tcXl0Tkcvc0pabW5D?= =?utf-8?B?K0d0S3hIblJ3d0hmQTh1VXVlU3h2KzVhWnE1NmZVMEp1OVNYbzV0NHVRWmRu?= =?utf-8?B?MzdRRTduY3VGZUZGay9nRW54d1F5d1B4S1VXTkU0d0xyVkovTk0zVVAyUHMw?= =?utf-8?B?bnQydUtHMEExdmpVSGZHdjVXelFrb0VmOUU4cUZzaTMvMzA5K1lPQjdwR2k3?= =?utf-8?B?VXFEbmhGMFk0UkxMeEZJM1ZESVlqMHYzTGRRdmNBYVI4dExrZ3ZJNHRKZzFP?= =?utf-8?B?MTVKU0IydWhjSTlJMTFOVTYvSlllNVBOYStTSjhqWXl4SEsxL2NiQnMybDdq?= =?utf-8?B?SS84WDl6NzE1bFZOampTVGh6OXAvdjY1TEhvQTIva0xPcURYS214RU5yL1JE?= =?utf-8?B?c05YY0dXZU5uTjRVMFE3cTNhaEVTTVE2MjhqM1gzRUd0Y242emc2TWIzNkhw?= =?utf-8?B?WWFlUlo3NDhOTldlZndwOU01bTRuc1o4OGpSNlR6Q0JwT2tiZGZMUWJwTlNl?= =?utf-8?B?OUVucWVmdnhVUzc3dW0rUFcvVndzQjNib1U0R1Nxc3FmTXRIaXVmYWFxSEtG?= =?utf-8?B?bnB6ck9vWTlyTitFcS9vRjJQTjBreVBZSU9hMWxpcXlTOVFjNmsrTjd4Zmhw?= =?utf-8?B?Vk9pMkdBaWNlK1JmS0NXc2x6eFlMU0VmcnZJL1hHSTZ5Q1Z1Tk1rYUNHakdK?= =?utf-8?B?Qm1DZ1JhT1NhbGxQNldES1hBbm9zZjY0Z01RWXVMd2lFTGM4bWpRVzZwZ2Iz?= =?utf-8?B?MVZ6UUVOVU95R0MyRGhiR0FpYWpqSHRYQ2ZkK1p6RkJkblRDb2ZNS1ZNOENk?= =?utf-8?B?bUxOMGFOdDZ4SnZTVkJqWTNsQlFrYTdkTVNEenZ6L25Gc0VLMytTQk13VnBF?= =?utf-8?B?czRaSkREV2xvL2o4RDl2dUxhKzFiTXdabEJVaW1CRGZPbWt3R1I4aEVXNjZ5?= =?utf-8?B?TjRmUVJkTjc4ckQybGhwSGRYWSsvemloYVR4WTA0Sit4SEh3a1JpbWFSSmxq?= =?utf-8?B?THk5M3BIQkZwc1ZXVUZHUzVINVdTLzRXemtKSXVlUmc5RWhoR3dWOXFZd3NF?= =?utf-8?B?citPZVVaa01GRjhTd3NWZ0Z0MUdSYk1kcXkrSG9LelF2QmNtdmNFbllvbW1s?= =?utf-8?B?TWZveUJnN0FUY0d3aEhQQUtDTEZFaVJibzBZWVB4SVhSTGgraVF6Y1U1QUc1?= =?utf-8?B?bjNIcnVhTnZhaklGY0VRcFl1UjBnbXEwcFlaVVJxUXpia3RRNWZlc01BcnBp?= =?utf-8?B?YWY3VUU0L1k5VnIxbU1DaHovVGowQm9qRlFaRFBqcVZsbmJaSThJZjVFUWhh?= =?utf-8?B?ZlV1NjN0ajZaQS9YVmhHUFZ2QlloaldqS2cyZk1LMWRCdG5GZzlKc0tVRVFs?= =?utf-8?B?cVNaTXFaeXM1Y3FjZnRHUUl2aFVaZjJJbUpuMXNJQkUrZTNPSUdGeUtEVndY?= =?utf-8?B?WkdxU3hNdG40bXVDbXRvRkJsWDd0SnhuaDhSQXJmcVZMaWIwK0pqOVUxZ3ps?= =?utf-8?B?VmZlbENoK1dkNlBVRHdzVHlTN254Rk0ra3N6UzFMTUZQYldWeVpvYk5xbFZZ?= =?utf-8?B?R1U0N2JaWFA1VTlSNzdQVVF2YXdCUUh3WTQ2NDBRVlZybW01MVFubzJsLzhy?= =?utf-8?B?anliZWVNRXNHRzRKZ0tmUTNQZDlKeFVHblpKZExwa1RJZWhiY0cySHZBNTV0?= =?utf-8?B?emxEcTIyUTZ3Yk9hOFVkU0hsODNPL3huWmowWjVJNVpkM2tEWFlDVkZxNDg5?= =?utf-8?Q?/d/HmAXJ4Xw2nqKxPVOC7UMzAb0MFqG2fXziAYztphPPI?= X-MS-Exchange-AntiSpam-MessageData-1: tB8FxsHLmMLZbnkcfV1QniRB93nQCG66PZk= X-OriginatorOrg: efficios.com X-MS-Exchange-CrossTenant-Network-Message-Id: c841ca50-54df-48f8-5fd8-08df1670bd88 X-MS-Exchange-CrossTenant-AuthSource: YT6PR01MB491026.CANPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Sep 2026 17:09:18.2694 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4f278736-4ab6-415c-957e-1f55336bd31e X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: dr/nN3WCr/Z8a6Ei4Pw5hhC4q82GMQ7xb7iep8wLe9KlO5MQcekl+5FknimJ88lzeEAW+SR9mZJX+KnVFEqEafpadmmoyBsHUFATv7AsWvY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: YT5PR01MB324718 X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 1411540002 X-Stat-Signature: oyhk3848ujsjpoqsoryfjrq14gdrkt6q X-HE-Tag: 1789837761-992944 X-HE-Meta: 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 pteab5wP 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-09-19 13:00, Linus Torvalds wrote: > On Sat, 19 Sept 2026 at 09:35, Bradley Morgan wrote: >> >> I think hazard pointers are good, what test do YOU suggest we do here? > > I want to see a single real-world example of "look, this speeds this > real load up by 10%, and the kernel code was actually cleaned up in > the process because hazard pointers are great". > > Not a microbenchmark that tests just the hazard pointers themselves, > but a real kernel feature that has been converted to hazard pointers, > and in the process actually shows improvement. > > The ONLY reason for hazard pointers to ever be merged is if they > actually buy us something real. > > So I want to see that 'real" thing. AFAIR, Boqun wanted to use hazard pointers to cleanup/speed up an hot lockdep reclaim path. Boqun, Paul, how is this effort going ? I suspect we should wait until that lockdep user of hazptr is ready for upstreaming and propose both at the same time, because a synchronization infrastructure without any significant in tree user is not really relevant, right ? Thanks, Mathieu -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com