From patchwork Wed Oct 10 07:19:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Huang, Ying" X-Patchwork-Id: 10634133 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B164913AD for ; Wed, 10 Oct 2018 07:28:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9DBBC294F6 for ; Wed, 10 Oct 2018 07:28:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 920D3296AF; Wed, 10 Oct 2018 07:28:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E53FA294F6 for ; Wed, 10 Oct 2018 07:28:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C000D6B0279; Wed, 10 Oct 2018 03:27:44 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 690946B027E; Wed, 10 Oct 2018 03:27:44 -0400 (EDT) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 364E46B027A; Wed, 10 Oct 2018 03:27:44 -0400 (EDT) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from mail-pf1-f197.google.com (mail-pf1-f197.google.com [209.85.210.197]) by kanga.kvack.org (Postfix) with ESMTP id B21B56B027B for ; Wed, 10 Oct 2018 03:27:43 -0400 (EDT) Received: by mail-pf1-f197.google.com with SMTP id g72-v6so3920976pfk.9 for ; Wed, 10 Oct 2018 00:27:43 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:from:to:cc :subject:date:message-id:in-reply-to:references; bh=RJGqsCPIMKQSid7ITXwAGT3UEHRHINXdfemoKnfozFw=; b=mGNK6iPkTTjxRZtfZ4W2UcXazUD+5SVM2C6y1fU7t8U/kIerDPJncAldfQjsJx7o0i ndiX2odotuo4JMV9/DsjzvReVo+uz1cFUzMnzKmT1missxKeghMdqIXBQaQrc0/u74Cc 6ddTqux9MFCvUwLlQA+S1QnuYNTpnCvwEf7V+F4pLmGpIhiTa+DfcdIq4EcAzdgTGNe0 PE4Gew14jckLmFNkNdrl5qL6xfUcZL5JEHXrkm17WCPMPyoirkyDgE1Ql93V5kNY1t5w ckmGCvrheZyTOGJX23W/r+CP//yGAhJK6/6HpxU1+z/KU7EPgRvrR4KKKLt6cnXWeEmg re4w== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of ying.huang@intel.com designates 134.134.136.31 as permitted sender) smtp.mailfrom=ying.huang@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Gm-Message-State: ABuFfoingg2iKeCrqrww6pnO3ikrvmnrsa2559kembwZL3B25Iu21AUq 7Ot7WFDtBueVkyfmbrq5KTJj6SxIMq0BaWLKxt7VGM9oetzkDsEpReDgXbUQfUAMK8fq9tTdwE6 EOoUiZTUkBieYEKGF5zwbhXEJNdLH8h2nxbA3xCw3ci4DrPVxDJAy9qRApGXdpxNh9Q== X-Received: by 2002:a17:902:d881:: with SMTP id b1-v6mr3821216plz.10.1539156463401; Wed, 10 Oct 2018 00:27:43 -0700 (PDT) X-Google-Smtp-Source: ACcGV63yjh0VR6Q5XTPb1VVr6TyPGga4dCZKJMrplPBnQklrsU8cFUpQDiq1rg+bmjivJBvbrco+ X-Received: by 2002:a17:902:d881:: with SMTP id b1-v6mr3821171plz.10.1539156462735; Wed, 10 Oct 2018 00:27:42 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1539156462; cv=none; d=google.com; s=arc-20160816; b=bZe5NexsQPku5Sp1gnhR2At3H3Ha3T9ypnytZHl30i++cNmhkpjQx/H0mrtvLNLyrG 7I4iI7bKHyiz3knBSpcTOkjAvFTprvACZcbeSjO/I0Ny9NyTpZw+Hg5Aj9DqEoCTs9WY ZrpbbtzUMTIE5seKCSTVHa4KEs3/InQpQ4W8yOPjSL0XfP9bSSD1tM+Db4cJyJWIsvW7 xJx2BhkEY/pxYYJd9467NE72HZKQ/egnF2suj5iwwAcnBectQhRihrCca3cuWSrtjKlZ /X31U2uiNJymzTV4yTKKUGOgfiGP7Tm8VSKLbKGeLJvvnBNF3j0cgOY1gudQzg4nICee L6sA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from; bh=RJGqsCPIMKQSid7ITXwAGT3UEHRHINXdfemoKnfozFw=; b=ttX5HylAR3skzZ/1ly7UG3cEG3sE0o94/pfoxeiqX2XoXBnXmCUHlY8WFpWNySIC9E b0Lw8vOMSzBE2/B+dQP78Hnc7ieptAcTbL0bUcRU57a3plX3erzcu4fNW1lCa6hw2U7E nu35xQKvMFyv0t614DCfhba23c29zHlKNygL8E8wxz8KIwWoF0Qf/cSIRCm3Rm51uJvF I6vwnmTHwd/gLxjvT2s+Xdfw/VyuAYXt+Z6PczW7IrgFFvqt+mhAvyJPhGEWXl2C8H7W lRGwutowIX357EZaK85ZWt4YrGO99b9xZGcKBjPQ5WDQr9RelQ4DMJn7bpU72psupZ+g NB7Q== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of ying.huang@intel.com designates 134.134.136.31 as permitted sender) smtp.mailfrom=ying.huang@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from mga06.intel.com (mga06.intel.com. [134.134.136.31]) by mx.google.com with ESMTPS id u4-v6si2721941pgi.554.2018.10.10.00.27.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 10 Oct 2018 00:27:42 -0700 (PDT) Received-SPF: pass (google.com: domain of ying.huang@intel.com designates 134.134.136.31 as permitted sender) client-ip=134.134.136.31; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ying.huang@intel.com designates 134.134.136.31 as permitted sender) smtp.mailfrom=ying.huang@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 10 Oct 2018 00:27:42 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,363,1534834800"; d="scan'208";a="93870243" Received: from yhuang-mobile.sh.intel.com ([10.239.198.87]) by fmsmga002.fm.intel.com with ESMTP; 10 Oct 2018 00:19:48 -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 -V6 19/21] swap: Support PMD swap mapping in common path Date: Wed, 10 Oct 2018 15:19:22 +0800 Message-Id: <20181010071924.18767-20-ying.huang@intel.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20181010071924.18767-1-ying.huang@intel.com> References: <20181010071924.18767-1-ying.huang@intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Original code is only for PMD migration entry, it is revised to support PMD swap mapping. 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 --- fs/proc/task_mmu.c | 12 +++++------- mm/gup.c | 36 ++++++++++++++++++++++++------------ mm/huge_memory.c | 7 ++++--- mm/mempolicy.c | 2 +- 4 files changed, 34 insertions(+), 23 deletions(-) diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 0995a84c78dc..befac96b42d9 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -984,7 +984,7 @@ static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, pmd = pmd_clear_soft_dirty(pmd); set_pmd_at(vma->vm_mm, addr, pmdp, pmd); - } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { + } else if (is_swap_pmd(pmd)) { pmd = pmd_swp_clear_soft_dirty(pmd); set_pmd_at(vma->vm_mm, addr, pmdp, pmd); } @@ -1314,9 +1314,8 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, if (pm->show_pfn) frame = pmd_pfn(pmd) + ((addr & ~PMD_MASK) >> PAGE_SHIFT); - } -#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION - else if (is_swap_pmd(pmd)) { + } else if (IS_ENABLED(CONFIG_HAVE_PMD_SWAP_ENTRY) && + is_swap_pmd(pmd)) { swp_entry_t entry = pmd_to_swp_entry(pmd); unsigned long offset; @@ -1329,10 +1328,9 @@ static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, flags |= PM_SWAP; if (pmd_swp_soft_dirty(pmd)) flags |= PM_SOFT_DIRTY; - VM_BUG_ON(!is_pmd_migration_entry(pmd)); - page = migration_entry_to_page(entry); + if (is_pmd_migration_entry(pmd)) + page = migration_entry_to_page(entry); } -#endif if (page && page_mapcount(page) == 1) flags |= PM_MMAP_EXCLUSIVE; diff --git a/mm/gup.c b/mm/gup.c index 08eb350e0f35..17fd850aa2cc 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -216,6 +216,7 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma, spinlock_t *ptl; struct page *page; struct mm_struct *mm = vma->vm_mm; + swp_entry_t entry; pmd = pmd_offset(pudp, address); /* @@ -243,18 +244,22 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma, if (!pmd_present(pmdval)) { if (likely(!(flags & FOLL_MIGRATION))) return no_page_table(vma, flags); - VM_BUG_ON(thp_migration_supported() && - !is_pmd_migration_entry(pmdval)); - if (is_pmd_migration_entry(pmdval)) + entry = pmd_to_swp_entry(pmdval); + if (thp_migration_supported() && is_migration_entry(entry)) { pmd_migration_entry_wait(mm, pmd); - pmdval = READ_ONCE(*pmd); - /* - * MADV_DONTNEED may convert the pmd to null because - * mmap_sem is held in read mode - */ - if (pmd_none(pmdval)) + pmdval = READ_ONCE(*pmd); + /* + * MADV_DONTNEED may convert the pmd to null because + * mmap_sem is held in read mode + */ + if (pmd_none(pmdval)) + return no_page_table(vma, flags); + goto retry; + } + if (IS_ENABLED(CONFIG_THP_SWAP) && !non_swap_entry(entry)) return no_page_table(vma, flags); - goto retry; + WARN_ON(1); + return no_page_table(vma, flags); } if (pmd_devmap(pmdval)) { ptl = pmd_lock(mm, pmd); @@ -276,11 +281,18 @@ static struct page *follow_pmd_mask(struct vm_area_struct *vma, return no_page_table(vma, flags); } if (unlikely(!pmd_present(*pmd))) { + entry = pmd_to_swp_entry(*pmd); spin_unlock(ptl); if (likely(!(flags & FOLL_MIGRATION))) return no_page_table(vma, flags); - pmd_migration_entry_wait(mm, pmd); - goto retry_locked; + if (thp_migration_supported() && is_migration_entry(entry)) { + pmd_migration_entry_wait(mm, pmd); + goto retry_locked; + } + if (IS_ENABLED(CONFIG_THP_SWAP) && !non_swap_entry(entry)) + return no_page_table(vma, flags); + WARN_ON(1); + return no_page_table(vma, flags); } if (unlikely(!pmd_trans_huge(*pmd))) { spin_unlock(ptl); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index b9c766683ee1..abefc50b08b7 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2133,7 +2133,7 @@ static inline int pmd_move_must_withdraw(spinlock_t *new_pmd_ptl, static pmd_t move_soft_dirty_pmd(pmd_t pmd) { #ifdef CONFIG_MEM_SOFT_DIRTY - if (unlikely(is_pmd_migration_entry(pmd))) + if (unlikely(is_swap_pmd(pmd))) pmd = pmd_swp_mksoft_dirty(pmd); else if (pmd_present(pmd)) pmd = pmd_mksoft_dirty(pmd); @@ -2219,11 +2219,12 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, preserve_write = prot_numa && pmd_write(*pmd); ret = 1; -#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION +#if defined(CONFIG_ARCH_ENABLE_THP_MIGRATION) || defined(CONFIG_THP_SWAP) if (is_swap_pmd(*pmd)) { swp_entry_t entry = pmd_to_swp_entry(*pmd); - VM_BUG_ON(!is_pmd_migration_entry(*pmd)); + VM_BUG_ON(!IS_ENABLED(CONFIG_THP_SWAP) && + !is_migration_entry(entry)); if (is_write_migration_entry(entry)) { pmd_t newpmd; /* diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 5837a067124d..7a5c1d2faea2 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -436,7 +436,7 @@ static int queue_pages_pmd(pmd_t *pmd, spinlock_t *ptl, unsigned long addr, struct queue_pages *qp = walk->private; unsigned long flags; - if (unlikely(is_pmd_migration_entry(*pmd))) { + if (unlikely(is_swap_pmd(*pmd))) { ret = 1; goto unlock; }