From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66D7AC04ABB for ; Wed, 12 Sep 2018 00:44:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E735520883 for ; Wed, 12 Sep 2018 00:44:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E735520883 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727664AbeILFp5 (ORCPT ); Wed, 12 Sep 2018 01:45:57 -0400 Received: from mga18.intel.com ([134.134.136.126]:49422 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726454AbeILFp5 (ORCPT ); Wed, 12 Sep 2018 01:45:57 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Sep 2018 17:44:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,362,1531810800"; d="scan'208";a="69283795" Received: from unknown (HELO yhuang-mobile.sh.intel.com) ([10.239.198.87]) by fmsmga007.fm.intel.com with ESMTP; 11 Sep 2018 17:44:01 -0700 From: Huang Ying 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 Subject: [PATCH -V5 RESEND 01/21] swap: Enable PMD swap operations for CONFIG_THP_SWAP Date: Wed, 12 Sep 2018 08:43:54 +0800 Message-Id: <20180912004414.22583-2-ying.huang@intel.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20180912004414.22583-1-ying.huang@intel.com> References: <20180912004414.22583-1-ying.huang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 e4ffa565a69f..194f97dc4583 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1334,7 +1334,7 @@ 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 5657a20e0c59..eb1e9d17371b 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 22af9d8a84ae..79ccbf8789d5 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -259,17 +259,7 @@ 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; @@ -287,6 +277,28 @@ 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) { @@ -307,16 +319,6 @@ 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 7bf074bf79e5..9a6e7e27e8d5 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -430,6 +430,14 @@ 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 -- 2.16.4