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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,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 F0627C433E2 for ; Tue, 15 Sep 2020 13:07:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A633720684 for ; Tue, 15 Sep 2020 13:07:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bytedance-com.20150623.gappssmtp.com header.i=@bytedance-com.20150623.gappssmtp.com header.b="Wgzm21bN" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726498AbgIONHI (ORCPT ); Tue, 15 Sep 2020 09:07:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726607AbgIONDq (ORCPT ); Tue, 15 Sep 2020 09:03:46 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E00BCC061224 for ; Tue, 15 Sep 2020 06:03:35 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id mm21so1735632pjb.4 for ; Tue, 15 Sep 2020 06:03:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ihCUQw41R9FsrvHiFmfh05nKlVrGscgM2mtw6HnVyB4=; b=Wgzm21bNvJZeUfE39i61WSjnncEdFvnHsL6LRcbfbG8qMG80SsNRb0yky3uwNluR3+ umeMtCxwqly+HGJDLRnGorII5eM5IdLf1djntn6fwT/R5UYUthd+BHyHoE4LKDZktijr BpJYY8arAS8SfRzbOhUm/N4L4wd9Ob4CRxu6GZwVvSNL22KgZrpmAG6UinFkq1NYYmqi TRDTb4+UgBz2JjAPc/D3vBT6t28H6VBjmoZo6G5kcrkxVlBQtc0+mkc06gyxgAGNvCus Np4R0taSFSkEnjfVEMOsgW5itFIzztw5KRRwOtKB9RYurZSqtjBLrImHSHKyvmMwWdPq pdkQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ihCUQw41R9FsrvHiFmfh05nKlVrGscgM2mtw6HnVyB4=; b=rAVkosT9ukcpCOtQkm+rJPxjhyoxxUHA6E+HD8x+8ztubSu2/xdUN3ZW310eYC7Ufg 2fvc6QBMmFr81OJiXYHm3CHh7f0Gy7d+oXtGdG6zS8/ck0pe8hp28OiGw5ZVIiHGAIKE s8prrBDOxTBnACpp0/mDjbJC6fqU5AQmlYAUfW1IuRQSOLnP1T32uvj8Lx8bQ0dPMI7S koeU5U/7rmsmPMVBbMbvnoO3xW3qWGQgiQitprqUm69yScHcWIQOfZWObEpHNAQICgUJ mN7smAkS0BTbV8xx2DbqCzgWR0LG5ROb2EBYvcGA0DyuTkQftLkXRiD8ES5mEcOT/Q5a EKiQ== X-Gm-Message-State: AOAM532xeUMl30A9ZcgUJKxxup8zO9GsN8Hq3WEOZkAJ4zy9REGVNFXB i9S0h6mSSum8k3aL+Q3k+fbs2A== X-Google-Smtp-Source: ABdhPJwx+1+21x7mTbb5CN2n3sjsO5NUiwrurWvh4dnjgbleOwi+3x3ysk5XetVWc3sCkJRiFuSnPA== X-Received: by 2002:a17:902:70c2:b029:d1:dea3:a4d6 with SMTP id l2-20020a17090270c2b02900d1dea3a4d6mr3314865plt.4.1600175015447; Tue, 15 Sep 2020 06:03:35 -0700 (PDT) Received: from localhost.bytedance.net ([103.136.220.66]) by smtp.gmail.com with ESMTPSA id w185sm14269855pfc.36.2020.09.15.06.03.26 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 15 Sep 2020 06:03:34 -0700 (PDT) From: Muchun Song To: corbet@lwn.net, mike.kravetz@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, paulmck@kernel.org, mchehab+huawei@kernel.org, pawan.kumar.gupta@linux.intel.com, rdunlap@infradead.org, oneukum@suse.com, anshuman.khandual@arm.com, jroedel@suse.de, almasrymina@google.com, rientjes@google.com Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, Muchun Song Subject: [RFC PATCH 21/24] mm/hugetlb: Merge pte to huge pmd only for gigantic page Date: Tue, 15 Sep 2020 20:59:44 +0800 Message-Id: <20200915125947.26204-22-songmuchun@bytedance.com> X-Mailer: git-send-email 2.21.0 (Apple Git-122) In-Reply-To: <20200915125947.26204-1-songmuchun@bytedance.com> References: <20200915125947.26204-1-songmuchun@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Merge pte to huge pmd if it has ever been split. Now only support gigantic page which's vmemmap pages size is an integer multiple of PMD_SIZE. This is the simplest case to handle. Signed-off-by: Muchun Song --- include/linux/hugetlb.h | 7 +++ mm/hugetlb.c | 104 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 109 insertions(+), 2 deletions(-) diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index e3aa192f1c39..c56df0da7ae5 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -611,6 +611,13 @@ static inline bool vmemmap_pmd_huge(pmd_t *pmd) } #endif +#ifndef vmemmap_pmd_mkhuge +static inline pmd_t vmemmap_pmd_mkhuge(struct page *page) +{ + return pmd_mkhuge(mk_pmd(page, PAGE_KERNEL)); +} +#endif + #ifndef VMEMMAP_HPAGE_SHIFT #define VMEMMAP_HPAGE_SHIFT PMD_SHIFT #endif diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 28c154679838..3ca36e259b4e 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1759,6 +1759,62 @@ static void __remap_huge_page_pte_vmemmap(struct page *reuse, pte_t *ptep, } } +static void __replace_huge_page_pte_vmemmap(pte_t *ptep, unsigned long start, + unsigned int nr, struct page *huge, + struct list_head *free_pages) +{ + unsigned long addr; + unsigned long end = start + (nr << PAGE_SHIFT); + + for (addr = start; addr < end; addr += PAGE_SIZE, ptep++) { + struct page *page; + pte_t old = *ptep; + pte_t entry; + + prepare_vmemmap_page(huge); + + entry = mk_pte(huge++, PAGE_KERNEL); + VM_WARN_ON(!pte_present(old)); + page = pte_page(old); + list_add(&page->lru, free_pages); + + set_pte_at(&init_mm, addr, ptep, entry); + } +} + +static void replace_huge_page_pmd_vmemmap(pmd_t *pmd, unsigned long start, + struct page *huge, + struct list_head *free_pages) +{ + unsigned long end = start + VMEMMAP_HPAGE_SIZE; + + flush_cache_vunmap(start, end); + __replace_huge_page_pte_vmemmap(pte_offset_kernel(pmd, start), start, + VMEMMAP_HPAGE_NR, huge, free_pages); + flush_tlb_kernel_range(start, end); +} + +static pte_t *merge_vmemmap_pte(pmd_t *pmdp, unsigned long addr) +{ + pte_t *pte; + struct page *page; + + pte = pte_offset_kernel(pmdp, addr); + page = pte_page(*pte); + set_pmd(pmdp, vmemmap_pmd_mkhuge(page)); + + return pte; +} + +static void merge_huge_page_pmd_vmemmap(pmd_t *pmd, unsigned long start, + struct page *huge, + struct list_head *free_pages) +{ + replace_huge_page_pmd_vmemmap(pmd, start, huge, free_pages); + pte_free_kernel(&init_mm, merge_vmemmap_pte(pmd, start)); + flush_tlb_kernel_range(start, start + VMEMMAP_HPAGE_SIZE); +} + static inline void alloc_vmemmap_pages(struct hstate *h, struct list_head *list) { int i; @@ -1772,6 +1828,15 @@ static inline void alloc_vmemmap_pages(struct hstate *h, struct list_head *list) } } +static inline void dissolve_compound_page(struct page *page, unsigned int order) +{ + int i; + unsigned int nr_pages = 1 << order; + + for (i = 1; i < nr_pages; i++) + set_page_refcounted(page + i); +} + static void alloc_huge_page_vmemmap(struct hstate *h, struct page *head) { pmd_t *pmd; @@ -1791,10 +1856,45 @@ static void alloc_huge_page_vmemmap(struct hstate *h, struct page *head) __remap_huge_page_pte_vmemmap); if (!freed_vmemmap_hpage_dec(pmd_page(*pmd)) && pmd_split(pmd)) { /* - * Todo: - * Merge pte to huge pmd if it has ever been split. + * Merge pte to huge pmd if it has ever been split. Now only + * support gigantic page which's vmemmap pages size is an + * integer multiple of PMD_SIZE. This is the simplest case + * to handle. */ clear_pmd_split(pmd); + + if (IS_ALIGNED(nr_vmemmap(h), VMEMMAP_HPAGE_NR)) { + unsigned long addr = (unsigned long)head; + unsigned long end = addr + nr_vmemmap_size(h); + + spin_unlock(ptl); + + for (; addr < end; addr += VMEMMAP_HPAGE_SIZE) { + void *to; + struct page *page; + + page = alloc_pages(GFP_VMEMMAP_PAGE & ~__GFP_NOFAIL, + VMEMMAP_HPAGE_ORDER); + if (!page) + goto out; + + to = page_to_virt(page); + memcpy(to, (void *)addr, VMEMMAP_HPAGE_SIZE); + + /* + * Make sure that any data that writes to the + * @to is made visible to the physical page. + */ + flush_kernel_vmap_range(to, VMEMMAP_HPAGE_SIZE); + + merge_huge_page_pmd_vmemmap(pmd++, addr, page, + &remap_pages); + } + +out: + free_vmemmap_page_list(&remap_pages); + return; + } } spin_unlock(ptl); } -- 2.20.1