From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) by kanga.kvack.org (Postfix) with ESMTP id 4F8476B0266 for ; Tue, 2 Oct 2018 08:15:59 -0400 (EDT) Received: by mail-ot1-f69.google.com with SMTP id b5-v6so1150839otk.21 for ; Tue, 02 Oct 2018 05:15:59 -0700 (PDT) Received: from foss.arm.com (foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id a62-v6si7632488otc.86.2018.10.02.05.15.58 for ; Tue, 02 Oct 2018 05:15:58 -0700 (PDT) From: Anshuman Khandual Subject: [PATCH 4/4] arm64/mm: Enable HugeTLB migration for contiguous bit HugeTLB pages Date: Tue, 2 Oct 2018 17:45:31 +0530 Message-Id: <1538482531-26883-5-git-send-email-anshuman.khandual@arm.com> In-Reply-To: <1538482531-26883-1-git-send-email-anshuman.khandual@arm.com> References: <1538482531-26883-1-git-send-email-anshuman.khandual@arm.com> Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: suzuki.poulose@arm.com, punit.agrawal@arm.com, will.deacon@arm.com, Steven.Price@arm.com, catalin.marinas@arm.com, mhocko@kernel.org, mike.kravetz@oracle.com, n-horiguchi@ah.jp.nec.com Let arm64 subscribe to the previously added framework in which architecture can inform whether a given huge page size is supported for migration. This just overrides the default function arch_hugetlb_migration_supported() and enables migration for all possible HugeTLB page sizes on arm64. With this, HugeTLB migration support on arm64 now covers all possible HugeTLB options. CONT PTE PMD CONT PMD PUD -------- --- -------- --- 4K: 64K 2M 32M 1G 16K: 2M 32M 1G 64K: 2M 512M 16G Signed-off-by: Anshuman Khandual --- arch/arm64/include/asm/hugetlb.h | 5 +++++ arch/arm64/mm/hugetlbpage.c | 20 ++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/arch/arm64/include/asm/hugetlb.h b/arch/arm64/include/asm/hugetlb.h index e73f685..656f70e 100644 --- a/arch/arm64/include/asm/hugetlb.h +++ b/arch/arm64/include/asm/hugetlb.h @@ -20,6 +20,11 @@ #include +#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION +#define arch_hugetlb_migration_supported arch_hugetlb_migration_supported +extern bool arch_hugetlb_migration_supported(struct hstate *h); +#endif + static inline pte_t huge_ptep_get(pte_t *ptep) { return READ_ONCE(*ptep); diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c index 4eafd9f..28f4795 100644 --- a/arch/arm64/mm/hugetlbpage.c +++ b/arch/arm64/mm/hugetlbpage.c @@ -27,6 +27,26 @@ #include #include +#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION +bool arch_hugetlb_migration_supported(struct hstate *h) +{ + size_t pagesize = huge_page_size(h); + + switch (pagesize) { +#ifdef CONFIG_ARM64_4K_PAGES + case PUD_SIZE: +#endif + case PMD_SIZE: + case CONT_PMD_SIZE: + case CONT_PTE_SIZE: + return true; + } + pr_warn("%s: unrecognized huge page size 0x%lx\n", + __func__, pagesize); + return false; +} +#endif + int pmd_huge(pmd_t pmd) { return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT); -- 2.7.4