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 3BDFCC4321E for ; Mon, 3 Sep 2018 07:22:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EB56F20856 for ; Mon, 3 Sep 2018 07:22:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EB56F20856 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 S1727351AbeICLlb (ORCPT ); Mon, 3 Sep 2018 07:41:31 -0400 Received: from mga12.intel.com ([192.55.52.136]:48305 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727201AbeICLl0 (ORCPT ); Mon, 3 Sep 2018 07:41:26 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Sep 2018 00:22:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,324,1531810800"; d="scan'208";a="70146885" Received: from yhuang-mobile.sh.intel.com ([10.239.196.86]) by orsmga008.jf.intel.com with ESMTP; 03 Sep 2018 00:22:28 -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 06/21] swap: Support PMD swap mapping when splitting huge PMD Date: Mon, 3 Sep 2018 15:21:59 +0800 Message-Id: <20180903072214.24602-7-ying.huang@intel.com> X-Mailer: git-send-email 2.16.4 In-Reply-To: <20180903072214.24602-1-ying.huang@intel.com> References: <20180903072214.24602-1-ying.huang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A huge PMD need to be split when zap a part of the PMD mapping etc. If the PMD mapping is a swap mapping, we need to split it too. This patch implemented the support for this. This is similar as splitting the PMD page mapping, except we need to decrease the PMD swap mapping count for the huge swap cluster too. If the PMD swap mapping count becomes 0, the huge swap cluster will be split. Notice: is_huge_zero_pmd() and pmd_page() doesn't work well with swap PMD, so pmd_present() check is called before them. 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 --- include/linux/huge_mm.h | 4 ++++ include/linux/swap.h | 6 ++++++ mm/huge_memory.c | 48 +++++++++++++++++++++++++++++++++++++++++++----- mm/swapfile.c | 32 ++++++++++++++++++++++++++++++++ 4 files changed, 85 insertions(+), 5 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 99c19b06d9a4..0f3e1739986f 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -226,6 +226,10 @@ static inline bool is_huge_zero_page(struct page *page) return READ_ONCE(huge_zero_page) == page; } +/* + * is_huge_zero_pmd() must be called after checking pmd_present(), + * otherwise, it may report false positive for PMD swap entry. + */ static inline bool is_huge_zero_pmd(pmd_t pmd) { return is_huge_zero_page(pmd_page(pmd)); diff --git a/include/linux/swap.h b/include/linux/swap.h index 63235b879a59..7ee8bfdd0861 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -614,11 +614,17 @@ static inline swp_entry_t get_swap_page(struct page *page) #ifdef CONFIG_THP_SWAP extern int split_swap_cluster(swp_entry_t entry); +extern int split_swap_cluster_map(swp_entry_t entry); #else static inline int split_swap_cluster(swp_entry_t entry) { return 0; } + +static inline int split_swap_cluster_map(swp_entry_t entry) +{ + return 0; +} #endif #ifdef CONFIG_MEMCG diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 9f3e8b5cdf7d..956c49bfd208 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1604,6 +1604,40 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd) return 0; } +/* Convert a PMD swap mapping to a set of PTE swap mappings */ +static void __split_huge_swap_pmd(struct vm_area_struct *vma, + unsigned long haddr, + pmd_t *pmd) +{ + struct mm_struct *mm = vma->vm_mm; + pgtable_t pgtable; + pmd_t _pmd; + swp_entry_t entry; + int i, soft_dirty; + + entry = pmd_to_swp_entry(*pmd); + soft_dirty = pmd_soft_dirty(*pmd); + + split_swap_cluster_map(entry); + + pgtable = pgtable_trans_huge_withdraw(mm, pmd); + pmd_populate(mm, &_pmd, pgtable); + + for (i = 0; i < HPAGE_PMD_NR; i++, haddr += PAGE_SIZE, entry.val++) { + pte_t *pte, ptent; + + pte = pte_offset_map(&_pmd, haddr); + VM_BUG_ON(!pte_none(*pte)); + ptent = swp_entry_to_pte(entry); + if (soft_dirty) + ptent = pte_swp_mksoft_dirty(ptent); + set_pte_at(mm, haddr, pte, ptent); + pte_unmap(pte); + } + smp_wmb(); /* make pte visible before pmd */ + pmd_populate(mm, pmd, pgtable); +} + /* * Return true if we do MADV_FREE successfully on entire pmd page. * Otherwise, return false. @@ -2070,7 +2104,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, VM_BUG_ON(haddr & ~HPAGE_PMD_MASK); VM_BUG_ON_VMA(vma->vm_start > haddr, vma); VM_BUG_ON_VMA(vma->vm_end < haddr + HPAGE_PMD_SIZE, vma); - VM_BUG_ON(!is_pmd_migration_entry(*pmd) && !pmd_trans_huge(*pmd) + VM_BUG_ON(!is_swap_pmd(*pmd) && !pmd_trans_huge(*pmd) && !pmd_devmap(*pmd)); count_vm_event(THP_SPLIT_PMD); @@ -2094,7 +2128,7 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, put_page(page); add_mm_counter(mm, mm_counter_file(page), -HPAGE_PMD_NR); return; - } else if (is_huge_zero_pmd(*pmd)) { + } else if (pmd_present(*pmd) && is_huge_zero_pmd(*pmd)) { /* * FIXME: Do we want to invalidate secondary mmu by calling * mmu_notifier_invalidate_range() see comments below inside @@ -2138,6 +2172,9 @@ static void __split_huge_pmd_locked(struct vm_area_struct *vma, pmd_t *pmd, page = pfn_to_page(swp_offset(entry)); } else #endif + if (IS_ENABLED(CONFIG_THP_SWAP) && is_swap_pmd(old_pmd)) + return __split_huge_swap_pmd(vma, haddr, pmd); + else page = pmd_page(old_pmd); VM_BUG_ON_PAGE(!page_count(page), page); page_ref_add(page, HPAGE_PMD_NR - 1); @@ -2229,14 +2266,15 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, * pmd against. Otherwise we can end up replacing wrong page. */ VM_BUG_ON(freeze && !page); - if (page && page != pmd_page(*pmd)) - goto out; + /* pmd_page() should be called only if pmd_present() */ + if (page && (!pmd_present(*pmd) || page != pmd_page(*pmd))) + goto out; if (pmd_trans_huge(*pmd)) { page = pmd_page(*pmd); if (PageMlocked(page)) clear_page_mlock(page); - } else if (!(pmd_devmap(*pmd) || is_pmd_migration_entry(*pmd))) + } else if (!(pmd_devmap(*pmd) || is_swap_pmd(*pmd))) goto out; __split_huge_pmd_locked(vma, pmd, haddr, freeze); out: diff --git a/mm/swapfile.c b/mm/swapfile.c index 8da03551ecbe..242f70c9e1f2 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -4034,6 +4034,38 @@ void mem_cgroup_throttle_swaprate(struct mem_cgroup *memcg, int node, } #endif +#ifdef CONFIG_THP_SWAP +/* + * The corresponding page table shouldn't be changed under us, that + * is, the page table lock should be held. + */ +int split_swap_cluster_map(swp_entry_t entry) +{ + struct swap_info_struct *si; + struct swap_cluster_info *ci; + unsigned long offset = swp_offset(entry); + + VM_BUG_ON(!IS_ALIGNED(offset, SWAPFILE_CLUSTER)); + si = _swap_info_get(entry); + if (!si) + return -EBUSY; + ci = lock_cluster(si, offset); + /* The swap cluster has been split by someone else, we are done */ + if (!cluster_is_huge(ci)) + goto out; + cluster_add_swapcount(ci, -1); + /* + * If the last PMD swap mapping has gone and the THP isn't in + * swap cache, the huge swap cluster will be split. + */ + if (!cluster_swapcount(ci) && !(si->swap_map[offset] & SWAP_HAS_CACHE)) + cluster_clear_huge(ci); +out: + unlock_cluster(ci); + return 0; +} +#endif + static int __init swapfile_init(void) { int nid; -- 2.16.4