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Thu, 1 Aug 2024 06:39:22 +0000 Received: from CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::47aa:294c:21c9:a6b8]) by CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::47aa:294c:21c9:a6b8%4]) with mapi id 15.20.7807.030; Thu, 1 Aug 2024 06:39:22 +0000 Message-ID: <439265d8-e71e-41db-8a46-55366fdd334e@intel.com> Date: Thu, 1 Aug 2024 14:39:12 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [linus:master] [mm] c0bff412e6: stress-ng.clone.ops_per_sec -2.9% regression To: David Hildenbrand , kernel test robot , Peter Xu CC: , , , Andrew Morton , Huacai Chen , Jason Gunthorpe , Matthew Wilcox , Nathan Chancellor , Ryan Roberts , WANG Xuerui , , , References: <202407301049.5051dc19-oliver.sang@intel.com> <193e302c-4401-4756-a552-9f1e07ecedcf@redhat.com> Content-Language: en-US From: "Yin, Fengwei" In-Reply-To: <193e302c-4401-4756-a552-9f1e07ecedcf@redhat.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SI1PR02CA0044.apcprd02.prod.outlook.com (2603:1096:4:1f6::6) To CO1PR11MB4820.namprd11.prod.outlook.com (2603:10b6:303:6f::8) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PR11MB4820:EE_|SN7PR11MB7538:EE_ X-MS-Office365-Filtering-Correlation-Id: aeb84101-ec11-49fb-7c98-08dcb1f4adaf X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|366016|376014; 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Anyhow, this pretty much sounds like > noise and can be ignored. > It's not about hugetlb. It looks like related with the change: diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 888353c209c03..7577fe7debafc 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -1095,7 +1095,12 @@ PAGEFLAG(Isolated, isolated, PF_ANY); static __always_inline int PageAnonExclusive(const struct page *page) { VM_BUG_ON_PGFLAGS(!PageAnon(page), page); - VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page); + /* + * HugeTLB stores this information on the head page; THP keeps it per + * page + */ + if (PageHuge(page)) + page = compound_head(page); return test_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags); The PageAnonExclusive() function is changed. And the profiling data showed it: 0.00 +3.9 3.90 perf-profile.calltrace.cycles-pp.folio_try_dup_anon_rmap_ptes.copy_present_ptes.copy_pte_range.copy_p4d_range.copy_page_range According https://download.01.org/0day-ci/archive/20240730/202407301049.5051dc19-oliver.sang@intel.com/config-6.9.0-rc4-00197-gc0bff412e67b: # CONFIG_DEBUG_VM is not set So maybe such code change could bring difference? And yes. 2.9% regression can be in noise range. Thanks. Regards Yin, Fengwei