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Shutemov" , David Hildenbrand , Catalin Marinas , Will Deacon , Anshuman Khandual , Yang Shi , , , References: <20230703135330.1865927-1-ryan.roberts@arm.com> <20230703135330.1865927-4-ryan.roberts@arm.com> From: "Yin, Fengwei" In-Reply-To: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR01CA0020.apcprd01.prod.exchangelabs.com (2603:1096:4:192::6) To CO1PR11MB4820.namprd11.prod.outlook.com (2603:10b6:303:6f::8) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PR11MB4820:EE_|SJ0PR11MB4911:EE_ X-MS-Office365-Filtering-Correlation-Id: d6adc0a5-a17e-4fe8-aa27-08db7c4ec323 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:CO1PR11MB4820.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(366004)(136003)(396003)(376002)(39860400002)(346002)(451199021)(2906002)(41300700001)(8936002)(8676002)(7416002)(36756003)(5660300002)(86362001)(31696002)(186003)(2616005)(31686004)(478600001)(26005)(6506007)(6512007)(6666004)(82960400001)(53546011)(6486002)(316002)(66556008)(4326008)(66946007)(38100700002)(54906003)(66476007)(110136005)(83380400001)(43740500002)(45980500001);DIR:OUT;SFP:1102; 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This is useful as some >>>> architectures (e.g. arm64) can coalesce TLB entries when the physical >>>> memory is suitably contiguous. >>>> >>>> The first user for this hint will be FLEXIBLE_THP, which aims to >>>> allocate large folios for anonymous memory to reduce page faults and >>>> other per-page operation costs. >>>> >>>> Here we add the default implementation of the function, used when the >>>> architecture does not define it, which returns the order corresponding >>>> to 64K. >>>> >>>> Signed-off-by: Ryan Roberts >>>> --- >>>> include/linux/pgtable.h | 13 +++++++++++++ >>>> 1 file changed, 13 insertions(+) >>>> >>>> diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h >>>> index a661a17173fa..f7e38598f20b 100644 >>>> --- a/include/linux/pgtable.h >>>> +++ b/include/linux/pgtable.h >>>> @@ -13,6 +13,7 @@ >>>> #include >>>> #include >>>> #include >>>> +#include >>>> >>>> #if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \ >>>> defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS >>>> @@ -336,6 +337,18 @@ static inline bool arch_has_hw_pte_young(void) >>>> } >>>> #endif >>>> >>>> +#ifndef arch_wants_pte_order >>>> +/* >>>> + * Returns preferred folio order for pte-mapped memory. Must be in range [0, >>>> + * PMD_SHIFT-PAGE_SHIFT) and must not be order-1 since THP requires large folios >>>> + * to be at least order-2. >>>> + */ >>>> +static inline int arch_wants_pte_order(struct vm_area_struct *vma) >>>> +{ >>>> + return ilog2(SZ_64K >> PAGE_SHIFT); >>> Default value which is not related with any silicon may be: PAGE_ALLOC_COSTLY_ORDER? >>> >>> Also, current pcp list support cache page with order 0...PAGE_ALLOC_COSTLY_ORDER, 9. >>> If the pcp could cover the page, the pressure to zone lock will be reduced by pcp. >> >> The value of PAGE_ALLOC_COSTLY_ORDER is reasonable but again it's a >> s/w policy not a h/w preference. Besides, I don't think we can include >> mmzone.h in pgtable.h. > > I think we can make a compromise: > 1. change the default implementation of arch_has_hw_pte_young() to return 0, and > 2. in memory.c, we can try PAGE_ALLOC_COSTLY_ORDER for archs that > don't override arch_has_hw_pte_young(), or if its return value is too > large to fit. Do you mean arch_wants_pte_order()? Yes. This looks good to me. Thanks. Regards Yin, Fengwei > This should also take care of the regression, right? 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