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 A3400C3601E for ; Thu, 10 Apr 2025 14:05:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 161866B0261; Thu, 10 Apr 2025 10:05:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 11C0B6B0266; Thu, 10 Apr 2025 10:05:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ECAA76B026A; Thu, 10 Apr 2025 10:05:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id C993D6B0261 for ; Thu, 10 Apr 2025 10:05:09 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 5423A80D93 for ; Thu, 10 Apr 2025 14:05:10 +0000 (UTC) X-FDA: 83318305980.10.8502182 Received: from YT6PR01CU002.outbound.protection.outlook.com (mail-canadacentralazon11022089.outbound.protection.outlook.com [40.107.193.89]) by imf16.hostedemail.com (Postfix) with ESMTP id 28AE118001B for ; Thu, 10 Apr 2025 14:05:06 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=efficios.com header.s=selector1 header.b=DRxoCRZw; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf16.hostedemail.com: domain of mathieu.desnoyers@efficios.com designates 40.107.193.89 as permitted sender) smtp.mailfrom=mathieu.desnoyers@efficios.com; dmarc=pass (policy=none) header.from=efficios.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1744293907; 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=bBP+5/tH/p8NGzQP5CbppJbiTDwyIwpLjnS1D5DPZFs=; b=7djEIja/PslnCVFJi4ewTHbtQT81dzEMcQUD4mIscc5WICamAKe6agM7t5mmKxMIB9h3hq XbVWjpikd7ZHcPy9Z2m6SdzQGoE3iXyqW+c9iBBeI3fZjWSHHOihMyvjqaYjLd7F01+tPP cUWh3HnWyhKMS8SYi/BRfWwURjXTB7E= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1744293907; a=rsa-sha256; cv=pass; b=4vOj4K0az2QFB/TCTEhHV1xcP5Q/y4p8uGbCNtXo8WkU8XWrnMbVhmAUtGsYoGYUmyY2Gf PP8EDYY7X+2dMGsP1GiW8//Uu/YAHtQj8KELxB2C5C3vNJ4FKcVZEGa3cJ56l8s6I/OSJE QtW3rZnCTyjWmYlb+wmevHdWPyVzxXo= ARC-Authentication-Results: i=2; imf16.hostedemail.com; dkim=pass header.d=efficios.com header.s=selector1 header.b=DRxoCRZw; arc=pass ("microsoft.com:s=arcselector10001:i=1"); spf=pass (imf16.hostedemail.com: domain of mathieu.desnoyers@efficios.com designates 40.107.193.89 as permitted sender) smtp.mailfrom=mathieu.desnoyers@efficios.com; dmarc=pass (policy=none) header.from=efficios.com ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=VKrLDBP4zAJr0cDYQJwQrMKKpYhlYJJ/pISDtyzLvAoAc/+fbwhT9gFuNCRw/JhrPlbZbpIYZLKI/9BIlveEJ6fi5RhPHUo7yppzeO7RNmDbhxJRH/S5cqc4Qn4axiYoPr6WzrIRJYoJ6e6nBxQ7MEcvPhUcagHUDVUOeRQDiOjNWbY+DhrkeGuoDSymyCPRjDUhA0cE1LIQV2O4PVjuWJlCtPEBlchAIHNE1eGJG9skiDHCG6YELesn14bdcqp+/O4m3j5ABnf/qO7fxhRY9qlC0FdXRmov1Iis1FE7XKVB/xF90tBGN+kNzplxMcp6XgWFo3gmQbwEut+xLgBx8g== 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=bBP+5/tH/p8NGzQP5CbppJbiTDwyIwpLjnS1D5DPZFs=; b=Sf+b/4AXuC5dWS6sDhIrowpoAGut34tmPnCaIPLT1jX/icP1mGh/6MzObQs6tsf/PRZOPhjvl666T5HOARP1p74ZTTRfMeGkfNcM6f1H99OMGQRvHSGMDL7rM3HSt1pi+LDtUYylttUeTqBaSny4B9P9GpS3zVOykd9mh3kMO3fKpMm6SGmqoztRZXl7PTwtWULpVEhR9AmzeT65k9G+bdCssC65mZzbvJuimVI/yh4HXL1+q+L9J0SYT9m6U+26Xtz9vl/xEzjDWIxPpvnoPgGtCVM3Z9dd1PCaTztowdTA4+4sqVQ8l9S+Q0uWXyQYXRaXrdZG1trlbNJqIqAljA== 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=bBP+5/tH/p8NGzQP5CbppJbiTDwyIwpLjnS1D5DPZFs=; b=DRxoCRZwTfLvDOsXqi+MtHEww+Rs8sHtZwfUCtcegjSYcJOfrZZUvcA+Ng7hyfB16YcpC6iNDcyAacErqAt6setTGon2miZM2FbOnqiLaVlQplwrjQp5nTDz0vwk9xg+F94kWAVuj4MmQZoeEU0eRm0fjd/qsT67WZ4kymESdhgRiSj4JM6zJLIN6zOxNx1+P+axjMiIZL/GNZ79In5l0buL8K8gkDX76XXtSfgQwTf9lF8gbl04GmAL1uC2NbEN27tDp8Hma218/ieZ7QC0E4EHLHYBa3I/ohm/xz43M89vFnMgwKkKzRB1Sh9NE7O/u5BoWqvr1ctOnlFBM3MTWQ== Received: from YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) by YQBPR0101MB9376.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:c01:63::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8606.35; Thu, 10 Apr 2025 14:04:56 +0000 Received: from YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM ([fe80::50f1:2e3f:a5dd:5b4]) by YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM ([fe80::50f1:2e3f:a5dd:5b4%7]) with mapi id 15.20.8606.033; Thu, 10 Apr 2025 14:04:56 +0000 Message-ID: <82c5e8c3-09a5-499a-bae2-7f5c70725a29@efficios.com> Date: Thu, 10 Apr 2025 10:04:54 -0400 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] fixup: [PATCH v12 2/3] sched: Move task_mm_cid_work to mm work_struct To: Gabriele Monaco , peterz@infradead.org, Ingo Molnar , linux-kernel@vger.kernel.org Cc: akpm@linux-foundation.org, linux-mm@kvack.org, paulmck@kernel.org, shuah@kernel.org References: <20250410125030.215239-1-gmonaco@redhat.com> From: Mathieu Desnoyers Content-Language: en-US In-Reply-To: <20250410125030.215239-1-gmonaco@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: QB1P288CA0020.CANP288.PROD.OUTLOOK.COM (2603:10b6:c00:2d::33) To YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:be::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: YT2PR01MB9175:EE_|YQBPR0101MB9376:EE_ X-MS-Office365-Filtering-Correlation-Id: 1de9b5fa-1fe2-417b-1ab5-08dd7838ac0e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?RWJmcFBFRjBIdzlXMTNORnEvangwV1pVTUMzSnN1SUZ4TjU4bnBYVnVpSzdv?= =?utf-8?B?Mk5pV2NjekZobDdJTjJObEp0UlgwUDgrdHJDc21xSkRRZjhHUG9NeGhQS2o3?= =?utf-8?B?SWptNTBMTnJqc3BiL3gyNGNZcTRwbHJuZ0V1OEQ0K3krRldlaHROQjZMU0hl?= =?utf-8?B?NjcrQlR5ajhDcHZ4UWZSQUxlYWlWUG8zVVVVQ1p5empMcUhtUzJZUW1tNzdt?= =?utf-8?B?b05NdU1qNWZUN1VDK0dZZS8xc2VGSXpPdzRSeS9WV1ljZUFLcnZqbXBhNk1S?= =?utf-8?B?cHZ2N295SXA2TFE1aVpBdXFqRkRhNzV0dUpwdnNvb3hTZjF5b3hMRDd4NzdF?= =?utf-8?B?eTNNbFRYU1F2akMxRncxd0RITVpOdHlmenI3RjNzK3NLc0orMCtQSm5KZG0w?= =?utf-8?B?ajltaWxrU2owc1FTc3RFTGRNNnRtM2xPN1NjdDZFQjFkOHc4RzgxTk5QK2cw?= =?utf-8?B?ZkpyWEZ5VUlROStQWWJ0Z0M1OHZpeFozSlM0YnZxL2paZTNVMmRjM1dYTFFF?= =?utf-8?B?WCtxcHQzbWVuY2FWQ0o5THRCck9XODRMZkEvcXJBSmZuRmxXTVF4ZDU2Ny8r?= =?utf-8?B?UWlIQjRjVWg2LzNleU51NnEyMkFSM2U4S2VvUzBmRCtNblAvRVVtcEJHRmdw?= =?utf-8?B?dU1BekM5MmF2NEtENFJIYnZLUnRTMTZCVEFESHpLSGlOWStIQ3ZrNnFkeGVD?= =?utf-8?B?MUtmbVVKZWMycnFIeHd4dDBocWtRb2pzaEZYZzFYVDA3eXVFTlNPRWh2cGox?= =?utf-8?B?WFpPS0VFRFJOQllDVTliNDk3MFFXVFlaMlM3aUE3VGozQjZDYnRma1NUeDM2?= =?utf-8?B?UTg4eXordXBWclRrN2ZaZjlqa2F0Z1dLclU2NDE1NUVVdXNzTHA1V0I0RkJ1?= =?utf-8?B?K3l5bmhOaTZUOTlpZWtNdEx2SXA2bDhNazVMeGk4UFkvLzh6eGVPR0tKbGJU?= =?utf-8?B?NWNuUE1IcSt5TGhqY3l2ZE9NYzYvS3RlR2RNSlZVNUdjS2RBeWxEYmgxYmZY?= =?utf-8?B?REdsejB3RG1GUnNGMndMWTB5VHNVaHFTNjlQVlZpQkFFQjFBYXVrbzdaTG85?= =?utf-8?B?Rkl4djNET3Qxai9RcFdldFk3L0JRY3lldjBoUGdLdFA4dnNyYkZ4QjVPQmhT?= =?utf-8?B?V2hxblNDRlVmY3JJYjY0dUJOampHRlVON2dkMzQzNFVMN283NEdMREZyL1N1?= =?utf-8?B?cFFTcDJkSG1ZbHhtYUN3YkNDSVdCaVQzVC90VDMrbFcwa0FzVGJWWHFmUVBv?= =?utf-8?B?R1YzQm92WjJUcUNlR1pjSE9tMlNHMUFhdUlZekxuVE43R2JSdWFCQWZjNEQ3?= =?utf-8?B?SU5KZDdGOW9sRU05b3BCVUlrYkZ2Nk5SSjY1SW5zQ3E1dlhxdXRaU1RUdDJB?= =?utf-8?B?WS9EVC9TSkhzamxhenBYYXR6MjBSRnZYNGIzKzYrb1pLbGxFeE45ZWk2a2s4?= =?utf-8?B?ZzRJZHp5cDRQZ012anhPNUVUMzc1RmdORWZwZEpiTldRSVpTeEpJZWVUckJS?= =?utf-8?B?Z1pCcSswQXcvMnhKcWtXVGoxU3dsWFlEejcrZnJ1WkJUNWZyb0h5WnhOQTU5?= =?utf-8?B?R3RWaThTQzNVM2k4UzdNQmlVak44QkRLVXJIdlVqNTNsUGMxMmhTcjFCcmlZ?= =?utf-8?B?Z2ltTC9LQXNFVytrTlhoWU9vY29NcVpnVm9UVWRUUVhwM3FCcGtxTFZ2eVcz?= =?utf-8?B?Wjl5ZDJaR2lPSnJ2bnBTNVRZOFh6cjlzZjlmbi9wNDFlY2hMSC83ak5ha0VN?= =?utf-8?B?TUFCSkNPeXVOaE9LMll1bURHTThVbHVFMUgvTHVkakc4OXdVeWFkN0IrVUtw?= =?utf-8?Q?Jxtq/ein+n4dYWNqI1aFRSXz/LnTd+EjcPScs=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(1800799024);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bUpzbncxa3J1Z2NXRGVpU0RZbitweGQ5eEs4WFFPSjVaTGFPWlNnVWM5NVQw?= =?utf-8?B?NFB3V2dBZGJXQlhvNmMxSDNvTVpBa1FpczFERXdKQjVFUURuSnJkQVlnejRF?= =?utf-8?B?Q3BsZnZUbHFNMXQ3WHRuZmpialRFSkFsYUxrdmNtNUpIaVVrOE1yVk0xbm1L?= =?utf-8?B?ZjU1emxGTk9GajMxamlhVno3V2s2Vk1haDN5YWNrUDN4dGxhVG0wYTlRWVFI?= =?utf-8?B?VUlaRzZmdWM0RUVlUTJIWHJUMktQd3h2R1VIbCtXd2k1eWF6b0puMDZkMHp3?= =?utf-8?B?Y0s4djgzMm9mSTN6NllUYUJWV3BTdkNTRDJCd1IvNElKK0NRblZEUFlZTHlZ?= =?utf-8?B?RHhQZXFPMHBSMTJGUWFwbHJHUEIzcTA4RUQwTlhXbTFzTjh4dUFLQ3ptbkp2?= =?utf-8?B?MUhwNkpwenFyOUJpMlJVWXJpTjA3MlR5UkY0QlpPMHcxNUZKa2grTm8xZEFM?= =?utf-8?B?TUlxOFhLdmxnajBTdVpjOS9HYjlPZTNjOGpWWk1abS9pbVVreWlPQUxIRkNZ?= =?utf-8?B?QlcyeGVybzA4bEt6YVgyYlVWOXhSMDR1R0Q0NVhKOVJMYVpSN2E3cTNIaDF4?= =?utf-8?B?VkNpQ0ZtM0krbStnSGlUMkFqa0hqcmNQUHIxZi95YzFFcFZaSkd0aWNnYjg5?= =?utf-8?B?dkJ2MUkxZEtVSmRiNUUwU3BYRkV1OEwzL3YyV2tGeUNlRmljaVlubEdDUDNz?= =?utf-8?B?YTJEMHJiRlBCWlhXT09tQ3E5bDVNTEhEa1pZNDM1ODZFOWhJNTJaUHdIci9V?= =?utf-8?B?UGJyT2JWazEwTW9JQlBPcTMraTUxVWpqcGRDSXN0Zlk2RHIxc0FLT3JtbFln?= =?utf-8?B?WW04UFFGZkpoMnNWaVY0OGdmVjN6d3FCMjVWc1IvUlh1WlRacUc3Z3ozOU16?= =?utf-8?B?a1pxSkJxU3VwekluS3JmZkV1dWtQbVV1RDBXMGcydW44VkZqRUhBWFgyWG9o?= =?utf-8?B?MktPcGlBaExVOGt2MFRUSldMK2xvV1ZvelcyL3FjZ1dVVzhwUy9WYWtoWjB4?= =?utf-8?B?QW44a3dCTXlPRDlzZmVlclNTc0dOc205MEJPTDN4amNHaXp0VHdGeFZROFR4?= =?utf-8?B?bU9veUxvREV3SDRpSmdLK1N6NjZjNUMrZFVqQVpRM01vTzRyVVQrVEZLZjc5?= =?utf-8?B?U1NZL1lTa3lUU1hudW8ralVVd1E4cVE0RXpRaUtyOWtZNFMxb1BkYVp4bWZw?= =?utf-8?B?T0tsU2N0ZmMxU2hXZEM4NWxVN3F6TmxaSFlxR1hBeGNhYlBlbGF0SUQzMmtt?= =?utf-8?B?dllWUnNBaUlKSHR3emdOVWUzL2FrK3BVM3BCR005NjlyTHRvZ25rTGZDbnZD?= =?utf-8?B?SUtqL1RiS3ZjQnhWNG5lUHFqZFpSOVl6NmFuZWZiUUNhZmlCOTRQSTAvYlZl?= =?utf-8?B?MGxldEpmOVRYb00xRDJKbDVZdnRkbUZ3SmJvY2FrbkpROUJNZG1ST2o2dnRh?= =?utf-8?B?ZUpLTEZ4UW55MGJKQmc0U2JsNmZRSVppc2pSTUJTM09zSmlrRWVTMW1RK0Zp?= =?utf-8?B?ZGhsTVF4dlhCWDdIMlZ5SzhLckZHbHlpZ3piVitFcXJWNGEvbFhkcE9Ca2tK?= =?utf-8?B?b2pwODlQcVpMSDUxYVRWMWhqak9ERHFsb1pTTnZBa0xkbHczT3VKZjlleWQ5?= =?utf-8?B?UlF1T3BLNitOeWZrVmpLbnI0SnIrejE2ZFM0d1drTVhrVlRsSGEvNjI1Q3NI?= =?utf-8?B?MWFYeUF6eXNGWS9lVDhaLzlIOHpIMUI4YjVJRC8vR2U1Z3NJRjRTL1VYaHRM?= =?utf-8?B?bnE4ZVptT1pNUW12M29MSWIvcUd4cU5IVWh3NkRqWWlUU2FXRU5SK1FpaGoy?= =?utf-8?B?NUtkcHVVeGZHRFFXSUE4Z1UvT09WV0lQUmk5US9FVTBFRFhySlBjRnRIcXZT?= =?utf-8?B?cUJLN3p6Z20yaGNXdDJ3RC9LSWt6YnJnMmNCclI3TitiTFp0TDh0aVN0b1h6?= =?utf-8?B?R09BWEFRMTB6NGF2VytFZFNpaFRwc2ZucmxzYnRwaGNIZnRWYTRZNUswMlBG?= =?utf-8?B?MkJXbjNJR0hwLzN6eVZsTFVsWHQ0MkVSRXBEVkZCK3Rvamt5QWJ5QUkzWTlX?= =?utf-8?B?RnBBUlF1NWhScmFta3NNZDFsWndhS1k1N0pFdkt1QXNyMkRHSzRZeXJmR0lq?= =?utf-8?B?clVHR2RKRkgzeFdaZTNpQXJqK0dsSVJZR2N0TkNzWTRXeWtRQ2lkZGhHQklq?= =?utf-8?Q?OKjRjckDFhB8f9mPQKq9WeQ=3D?= X-OriginatorOrg: efficios.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1de9b5fa-1fe2-417b-1ab5-08dd7838ac0e X-MS-Exchange-CrossTenant-AuthSource: YT2PR01MB9175.CANPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2025 14:04:55.8490 (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: nLYU2iyTXRMVZ7eKXqV4umeIt8eqQz4O6QfiQCfnnQNm5cKCPD99KaBdcAFbLuQYwZJ+g+/YLAwE8cmMKxu38j3q5X6ffwDVhGb0I3ajeIo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: YQBPR0101MB9376 X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 28AE118001B X-Stat-Signature: 8tg4ri6oax8t4hrt3zu9ifyxco798izk X-HE-Tag: 1744293906-660444 X-HE-Meta: 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 /wkOjmFj 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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 2025-04-10 08:50, Gabriele Monaco wrote: > Thanks both for the comments, I tried to implement what Mathieu > suggested. This patch applies directly on 2/3 but I'm sending it here > first to get feedback. > > Essentially, I refactored a bit to avoid the need to add more > dependencies to rseq, the rseq_tick is now called task_tick_mm_cid (as > before the series) and it does the two things you mentioned: > * A) trigger the mm_cid recompaction > * B) trigger an update of the task's rseq->mm_cid field at some point > after recompaction, so it can get a mm_cid value closer to 0. > > Now, A occurs only after the scan time elapsed, which means it could > potentially run multiple times in case the work is not scheduled before > the next tick, I'm not sure adding more checks to make sure it > happens once and only once really makes sense here. The scan is gated by two checks now: > + if (t->mm && rtime > RSEQ_UNPREEMPTED_THRESHOLD) { > + if (mm_cid_needs_scan(t->mm)) And likewise for the periodic check for preemption: > + if (t->mm && rtime > RSEQ_UNPREEMPTED_THRESHOLD) { [...] > + else if (time_after(jiffies, t->last_rseq_preempt + > + msecs_to_jiffies(MM_CID_SCAN_DELAY))) { Those second levels of time checks would prevent adding significant overhead on every tick after the threshold is reached. > > B is occurring after the work updates the last scan time, so we are in a > condition where the runtime is above threshold but the (next) scan time > did not expire yet. > I tried to account for multiple threads updating the mm_cid (not > necessarily the long running one, or in case more are long running), for > this I'm tracking the last time we updated the mm_cid, if that occurred > before the last mm_cid scan, we need to update (and preempt). > > Does this make sense to you? It makes sense. Note that it adds overhead to rseq_preempt() (a store to t->last_rseq_preempt), which is a fast path. I don't know if we should care. Also part of task_tick_mm_cid could be moved to a helper, e.g.: static void task_reset_mm_cid(struct rq *rq, struct task_struct *t) { int old_cid = t->mm_cid; if (!t->mm_cid_active) return; mm_cid_snapshot_time(rq, t->mm); mm_cid_put_lazy(t); t->last_mm_cid = t->mm_cid = mm_cid_get(rq, t, t->mm); if (old_cid == t->mm_cid) return; rseq_preempt(t); } Thanks, Mathieu > > Thanks, > Gabriele > > Signed-off-by: Gabriele Monaco > --- > include/linux/rseq.h | 14 +------------- > include/linux/sched.h | 1 + > kernel/sched/core.c | 42 +++++++++++++++++++++++++++++++++++++++++- > kernel/sched/sched.h | 3 +++ > 4 files changed, 46 insertions(+), 14 deletions(-) > > diff --git a/include/linux/rseq.h b/include/linux/rseq.h > index d20fd72f4c80d..7e3fa2ae9e7a4 100644 > --- a/include/linux/rseq.h > +++ b/include/linux/rseq.h > @@ -7,8 +7,6 @@ > #include > #include > > -#define RSEQ_UNPREEMPTED_THRESHOLD (100ULL * 1000000) /* 100ms */ > - > /* > * Map the event mask on the user-space ABI enum rseq_cs_flags > * for direct mask checks. > @@ -54,14 +52,7 @@ static inline void rseq_preempt(struct task_struct *t) > { > __set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask); > rseq_set_notify_resume(t); > -} > - > -static inline void rseq_preempt_from_tick(struct task_struct *t) > -{ > - u64 rtime = t->se.sum_exec_runtime - t->se.prev_sum_exec_runtime; > - > - if (rtime > RSEQ_UNPREEMPTED_THRESHOLD) > - rseq_preempt(t); > + t->last_rseq_preempt = jiffies; > } > > /* rseq_migrate() requires preemption to be disabled. */ > @@ -114,9 +105,6 @@ static inline void rseq_signal_deliver(struct ksignal *ksig, > static inline void rseq_preempt(struct task_struct *t) > { > } > -static inline void rseq_preempt_from_tick(struct task_struct *t) > -{ > -} > static inline void rseq_migrate(struct task_struct *t) > { > } > diff --git a/include/linux/sched.h b/include/linux/sched.h > index 851933e62bed3..5b057095d5dc0 100644 > --- a/include/linux/sched.h > +++ b/include/linux/sched.h > @@ -1424,6 +1424,7 @@ struct task_struct { > int last_mm_cid; /* Most recent cid in mm */ > int migrate_from_cpu; > int mm_cid_active; /* Whether cid bitmap is active */ > + unsigned long last_rseq_preempt; /* Time of last preempt in jiffies */ > #endif > > struct tlbflush_unmap_batch tlb_ubc; > diff --git a/kernel/sched/core.c b/kernel/sched/core.c > index 52ad709094167..9f0c9cc284804 100644 > --- a/kernel/sched/core.c > +++ b/kernel/sched/core.c > @@ -5663,7 +5663,7 @@ void sched_tick(void) > resched_latency = cpu_resched_latency(rq); > calc_global_load_tick(rq); > sched_core_tick(rq); > - rseq_preempt_from_tick(donor); > + task_tick_mm_cid(rq, donor); > scx_tick(rq); > > rq_unlock(rq, &rf); > @@ -10618,6 +10618,46 @@ void init_sched_mm_cid(struct task_struct *t) > } > } > > +void task_tick_mm_cid(struct rq *rq, struct task_struct *t) > +{ > + u64 rtime = t->se.sum_exec_runtime - t->se.prev_sum_exec_runtime; > + > + /* > + * If a task is running unpreempted for a long time, it won't get its > + * mm_cid compacted and won't update its mm_cid value after a > + * compaction occurs. > + * For such a task, this function does two things: > + * A) trigger the mm_cid recompaction, > + * B) trigger an update of the task's rseq->mm_cid field at some point > + * after recompaction, so it can get a mm_cid value closer to 0. > + * A change in the mm_cid triggers an rseq_preempt. > + * > + * A occurs only after the next scan time elapsed but before the > + * compaction work is actually scheduled. > + * B occurs once after the compaction work completes, that is when scan > + * is no longer needed (it occurred for this mm) but the last rseq > + * preempt was done before the last mm_cid scan. > + */ > + if (t->mm && rtime > RSEQ_UNPREEMPTED_THRESHOLD) { > + if (mm_cid_needs_scan(t->mm)) > + rseq_set_notify_resume(t); > + else if (time_after(jiffies, t->last_rseq_preempt + > + msecs_to_jiffies(MM_CID_SCAN_DELAY))) { > + int old_cid = t->mm_cid; > + > + if (!t->mm_cid_active) > + return; > + mm_cid_snapshot_time(rq, t->mm); > + mm_cid_put_lazy(t); > + t->last_mm_cid = t->mm_cid = mm_cid_get(rq, t, t->mm); > + if (old_cid == t->mm_cid) > + t->last_rseq_preempt = jiffies; > + else > + rseq_preempt(t); > + } > + } > +} > + > /* Call only when curr is a user thread. */ > void task_queue_mm_cid(struct task_struct *curr) > { > diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h > index 1703cd16d5433..7d104d12ed974 100644 > --- a/kernel/sched/sched.h > +++ b/kernel/sched/sched.h > @@ -3582,12 +3582,14 @@ extern const char *preempt_modes[]; > > #define SCHED_MM_CID_PERIOD_NS (100ULL * 1000000) /* 100ms */ > #define MM_CID_SCAN_DELAY 100 /* 100ms */ > +#define RSEQ_UNPREEMPTED_THRESHOLD SCHED_MM_CID_PERIOD_NS > > extern raw_spinlock_t cid_lock; > extern int use_cid_lock; > > extern void sched_mm_cid_migrate_from(struct task_struct *t); > extern void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t); > +extern void task_tick_mm_cid(struct rq *rq, struct task_struct *t); > extern void init_sched_mm_cid(struct task_struct *t); > > static inline void __mm_cid_put(struct mm_struct *mm, int cid) > @@ -3856,6 +3858,7 @@ static inline void switch_mm_cid(struct rq *rq, > static inline void switch_mm_cid(struct rq *rq, struct task_struct *prev, struct task_struct *next) { } > static inline void sched_mm_cid_migrate_from(struct task_struct *t) { } > static inline void sched_mm_cid_migrate_to(struct rq *dst_rq, struct task_struct *t) { } > +static inline void task_tick_mm_cid(struct rq *rq, struct task_struct *t) { } > static inline void init_sched_mm_cid(struct task_struct *t) { } > #endif /* !CONFIG_SCHED_MM_CID */ > > > base-commit: c59c19fcfad857c96effa3b2e9eb6d934d2380d8 -- Mathieu Desnoyers EfficiOS Inc. https://www.efficios.com