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Sat, 28 Jan 2023 13:20:24 +0000 Received: from CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::1531:707:dec4:68b4]) by CO1PR11MB4820.namprd11.prod.outlook.com ([fe80::1531:707:dec4:68b4%3]) with mapi id 15.20.6043.030; Sat, 28 Jan 2023 13:20:24 +0000 Message-ID: <560a0204-5f4e-07af-61be-26e949fe6f20@intel.com> Date: Sat, 28 Jan 2023 21:20:14 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0 Thunderbird/102.6.1 Subject: Re: [PATCH mm-unstable v2 1/6] mm: Add folio_estimated_mapcount() Content-Language: en-US To: David Hildenbrand , Vishal Moola CC: , , References: <20230124012210.13963-1-vishal.moola@gmail.com> <20230124012210.13963-2-vishal.moola@gmail.com> <477bbc1e-a60a-cfce-d31e-0b4bdd5f6429@redhat.com> <526e5156-6c4b-9f2c-1637-2f83c1dfea1e@redhat.com> <53d86764-d155-8d97-1a4d-7e701848c950@redhat.com> <52af321f-175b-9fa9-10f0-ac2bba04c677@redhat.com> From: "Yin, Fengwei" In-Reply-To: <52af321f-175b-9fa9-10f0-ac2bba04c677@redhat.com> Content-Type: text/plain; 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Then you can comment how we estimate sharers by looking at into how many page tables the first subpage is currently mapped, and assume the same holds true for the other subpages. Vote for 'folio_estimated_sharers()'. If better method other than checking mapcount is found in the future, it's easy to update the implementation without change the API name. Regards Yin, Fengwei