From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-f197.google.com (mail-pl1-f197.google.com [209.85.214.197]) by kanga.kvack.org (Postfix) with ESMTP id D46F06B1F31 for ; Tue, 20 Nov 2018 03:54:59 -0500 (EST) Received: by mail-pl1-f197.google.com with SMTP id az10so932315plb.11 for ; Tue, 20 Nov 2018 00:54:59 -0800 (PST) Received: from mga01.intel.com (mga01.intel.com. [192.55.52.88]) by mx.google.com with ESMTPS id b15si24149550plm.431.2018.11.20.00.54.57 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 20 Nov 2018 00:54:58 -0800 (PST) From: Huang Ying Subject: [PATCH -V7 RESEND 01/21] swap: Enable PMD swap operations for CONFIG_THP_SWAP Date: Tue, 20 Nov 2018 16:54:29 +0800 Message-Id: <20181120085449.5542-2-ying.huang@intel.com> In-Reply-To: <20181120085449.5542-1-ying.huang@intel.com> References: <20181120085449.5542-1-ying.huang@intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Huang Ying , "Kirill A. Shutemov" , Andrea Arcangeli , Michal Hocko , Johannes Weiner , Shaohua Li , Hugh Dickins , Minchan Kim , Rik van Riel , Dave Hansen , Naoya Horiguchi , Zi Yan , Daniel Jordan Currently, "the swap entry" in the page tables is used for a number of things outside of actual swap, like page migration, etc. We support the THP/PMD "swap entry" for page migration currently and the functions behind this are tied to page migration's config option (CONFIG_ARCH_ENABLE_THP_MIGRATION). But, we also need them for THP swap optimization. So a new config option (CONFIG_HAVE_PMD_SWAP_ENTRY) is added. It is enabled when either CONFIG_ARCH_ENABLE_THP_MIGRATION or CONFIG_THP_SWAP is enabled. And PMD swap entry functions are tied to this new config option instead. Some functions enabled by CONFIG_ARCH_ENABLE_THP_MIGRATION are for page migration only, they are still enabled only for that. Signed-off-by: "Huang, Ying" Cc: "Kirill A. Shutemov" Cc: Andrea Arcangeli Cc: Michal Hocko Cc: Johannes Weiner Cc: Shaohua Li Cc: Hugh Dickins Cc: Minchan Kim Cc: Rik van Riel Cc: Dave Hansen Cc: Naoya Horiguchi Cc: Zi Yan Cc: Daniel Jordan --- arch/x86/include/asm/pgtable.h | 2 +- include/asm-generic/pgtable.h | 2 +- include/linux/swapops.h | 44 ++++++++++++++++++---------------- mm/Kconfig | 8 +++++++ 4 files changed, 33 insertions(+), 23 deletions(-) diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 40616e805292..e830ab345551 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1333,7 +1333,7 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY); } -#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +#ifdef CONFIG_HAVE_PMD_SWAP_ENTRY static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) { return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY); diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 359fb935ded6..20aab7bfd487 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -675,7 +675,7 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm, #endif #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY -#ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION +#ifndef CONFIG_HAVE_PMD_SWAP_ENTRY static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) { return pmd; diff --git a/include/linux/swapops.h b/include/linux/swapops.h index 4d961668e5fc..905ddc65caa3 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -254,17 +254,7 @@ static inline int is_write_migration_entry(swp_entry_t entry) #endif -struct page_vma_mapped_walk; - -#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION -extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, - struct page *page); - -extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, - struct page *new); - -extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd); - +#ifdef CONFIG_HAVE_PMD_SWAP_ENTRY static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) { swp_entry_t arch_entry; @@ -282,6 +272,28 @@ static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) arch_entry = __swp_entry(swp_type(entry), swp_offset(entry)); return __swp_entry_to_pmd(arch_entry); } +#else +static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) +{ + return swp_entry(0, 0); +} + +static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) +{ + return __pmd(0); +} +#endif + +struct page_vma_mapped_walk; + +#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +extern void set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw, + struct page *page); + +extern void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, + struct page *new); + +extern void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd); static inline int is_pmd_migration_entry(pmd_t pmd) { @@ -302,16 +314,6 @@ static inline void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, static inline void pmd_migration_entry_wait(struct mm_struct *m, pmd_t *p) { } -static inline swp_entry_t pmd_to_swp_entry(pmd_t pmd) -{ - return swp_entry(0, 0); -} - -static inline pmd_t swp_entry_to_pmd(swp_entry_t entry) -{ - return __pmd(0); -} - static inline int is_pmd_migration_entry(pmd_t pmd) { return 0; diff --git a/mm/Kconfig b/mm/Kconfig index 25c71eb8a7db..d7c5299c5b7d 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -422,6 +422,14 @@ config THP_SWAP For selection by architectures with reasonable THP sizes. +# +# "PMD swap entry" in the page table is used both for migration and +# actual swap. +# +config HAVE_PMD_SWAP_ENTRY + def_bool y + depends on THP_SWAP || ARCH_ENABLE_THP_MIGRATION + config TRANSPARENT_HUGE_PAGECACHE def_bool y depends on TRANSPARENT_HUGEPAGE -- 2.18.1