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IA0PR12MB8716.namprd12.prod.outlook.com (2603:10b6:208:485::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6544.24; Wed, 5 Jul 2023 05:48:50 +0000 Received: from MN2PR12MB3008.namprd12.prod.outlook.com ([fe80::3d2c:e06a:5a1c:b1a4]) by MN2PR12MB3008.namprd12.prod.outlook.com ([fe80::3d2c:e06a:5a1c:b1a4%3]) with mapi id 15.20.6544.024; Wed, 5 Jul 2023 05:48:49 +0000 Message-ID: <88d0c858-586b-bf59-8d57-d31ec63a9e35@amd.com> Date: Wed, 5 Jul 2023 11:18:37 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.13.1 Subject: Re: [RFC PATCH V3 1/1] sched/numa: Fix disjoint set vma scan regression Content-Language: en-US To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernel test robot Cc: Ingo Molnar , Peter Zijlstra , Mel Gorman , Andrew Morton , David Hildenbrand , rppt@kernel.org, Juri Lelli , Vincent Guittot , Bharata B Rao , Aithal Srikanth References: 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relaxation. For e.g., > > 1) Concern raised by PeterZ, where if there are N partition sets of vmas > belonging to tasks, then unfairness in allowing these threads to scan could > potentially amplify the side effect of some of the vmas being left > unscanned. > > 2) Below reports of LKP numa01 benchmark regression. > > Currently this is handled by allowing first two scanning unconditional > as indicated by mm->numa_scan_seq. This is imprecise since for some > benchmark vma scanning might itself start at numa_scan_seq > 2. > > Solution: > Allow unconditional scanning of vmas of tasks depending on vma size. This > is achieved by maintaining a per vma scan counter, where > > f(allowed_to_scan) = f(scan_counter < vma_size / scan_size) > > Result: > numa01_THREAD_ALLOC result on 6.4.0-rc2 (that has numascan enhancement) > base-numascan base base+fix > real 1m1.507s 1m23.259s 1m2.632s > user 213m51.336s 251m46.363s 220m35.528s > sys 3m3.397s 0m12.492s 2m41.393s > > numa_hit 5615517 4560123 4963875 > numa_local 5615505 4560024 4963700 > numa_other 12 99 175 > numa_pte_updates 1822797 493 1559111 > numa_hint_faults 1307113 523 1469031 > numa_hint_faults_local 612617 488 884829 > numa_pages_migrated 694370 35 584202 > > Summary: Regression in base is recovered by allowing scanning as required. > > [1] https://lore.kernel.org/lkml/cover.1677672277.git.raghavendra.kt@amd.com/T/#t > > Fixes: fc137c0ddab2 ("sched/numa: enhance vma scanning logic") > regression. > Reported-by: Aithal Srikanth > Reported-by: kernel test robot > Closes: https://lore.kernel.org/lkml/db995c11-08ba-9abf-812f-01407f70a5d4@amd.com/T/ > Signed-off-by: Raghavendra K T Hello kernel test robot, Gentle ping to check if the patch has helped your regression report. Thanks - Raghu