From patchwork Tue Jun 6 19:03:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ackerley Tng X-Patchwork-Id: 13269590 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 508EEC77B73 for ; Tue, 6 Jun 2023 19:04:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239253AbjFFTEb (ORCPT ); Tue, 6 Jun 2023 15:04:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239207AbjFFTES (ORCPT ); Tue, 6 Jun 2023 15:04:18 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2701210D5 for ; Tue, 6 Jun 2023 12:04:17 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id 3f1490d57ef6-babb7aaa605so9804456276.3 for ; Tue, 06 Jun 2023 12:04:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1686078257; x=1688670257; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=+hBYwj+hDVdRsN8/1AwobMe3CTJKx3rv/kAyLXc58so=; b=H7E3FiMFKx8wp9Dwc4KoRhYITqBdXBFbeuSdYVU7Xl2quiLV1TI/RBj6a84p3NhH+A 6Ot5kD4xdeERpXhx7UwpPyWytx0ckODJexzs4v23BK+jBmvA/ejV4+lVF1eJPpgHviEu uumCUBgaOBD3ECdp59KweUCJLiBB+HqC6NZrMNuSqXw8B1oiojQQln/v/JBqZ3dwGu23 pfO6fIO6tANLPLyeFwUcf8Qi72Eo5MQO/Xul1ZcTopSBQKuO94fsqUr8V4qbQI+x7jBp uRAq7xDxsM2mm1v+/TKXiQUaFoQhkNFaDB59XiYo7wFgeMK27ohvJb62IAQGNTsPTIVZ PvjQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686078257; x=1688670257; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=+hBYwj+hDVdRsN8/1AwobMe3CTJKx3rv/kAyLXc58so=; b=F2CWn7/qGq3bdVxyYoaqNV+QyFznrnfjsSftN4xmt5Jd322URxY78U0wAXm3x2fV6a 3JrzOY0bzKbdOkCMeSpozaWkAYfSo7V5D5AZX+y2P3ARAUoLvFE2ltp442A+BmC73yA9 6Fp1gcsyWArC0O4S1Bv/5nl33OWAnurxOABB9cKPno8PPSZXjZKMWKaNGSP83sKrDVe9 Ypb9x2jBh+9mEaTWBdlpuSw5CM1nzHJTMKc9AY43HqHNoOHCrxMneWLuUPVYDG1LUTQ/ bcX1YWof4dSafKacZIHHgEh9Ez/s15Nl8GPkNfVTmovDkzsLlxfmccQcaQEslFYXpa1V /zCw== X-Gm-Message-State: AC+VfDw7X1lN4DxhzfhTOsIyWMFaXDdDDqIfF6DyLQuF8/lIevSicEVf B97uYkdGZIS/+lurxNVzLUswRjTZqicLt9kcDA== X-Google-Smtp-Source: ACHHUZ68tuaeB7ur+Gj0U5ZR5IxxzkEh+TRxbplImu5DoiCt68fH6drAzpWUcd9Di+kjyJGUd+Eua/GN38BmucMMtA== X-Received: from ackerleytng-ctop.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:13f8]) (user=ackerleytng job=sendgmr) by 2002:a05:6902:1882:b0:ba8:337a:d8a3 with SMTP id cj2-20020a056902188200b00ba8337ad8a3mr1661367ybb.11.1686078256773; Tue, 06 Jun 2023 12:04:16 -0700 (PDT) Date: Tue, 6 Jun 2023 19:03:47 +0000 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.41.0.rc0.172.g3f132b7071-goog Message-ID: <97c312c8c0b56218454d546a540a3ea2e2a825e2.1686077275.git.ackerleytng@google.com> Subject: [RFC PATCH 02/19] mm: hugetlb: Move and expose hugetlbfs_zero_partial_page From: Ackerley Tng To: akpm@linux-foundation.org, mike.kravetz@oracle.com, muchun.song@linux.dev, pbonzini@redhat.com, seanjc@google.com, shuah@kernel.org, willy@infradead.org Cc: brauner@kernel.org, chao.p.peng@linux.intel.com, coltonlewis@google.com, david@redhat.com, dhildenb@redhat.com, dmatlack@google.com, erdemaktas@google.com, hughd@google.com, isaku.yamahata@gmail.com, jarkko@kernel.org, jmattson@google.com, joro@8bytes.org, jthoughton@google.com, jun.nakajima@intel.com, kirill.shutemov@linux.intel.com, liam.merwick@oracle.com, mail@maciej.szmigiero.name, mhocko@suse.com, michael.roth@amd.com, qperret@google.com, rientjes@google.com, rppt@kernel.org, steven.price@arm.com, tabba@google.com, vannapurve@google.com, vbabka@suse.cz, vipinsh@google.com, vkuznets@redhat.com, wei.w.wang@intel.com, yu.c.zhang@linux.intel.com, kvm@vger.kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org, x86@kernel.org, Ackerley Tng Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Zeroing of pages is generalizable to hugetlb and is not specific to hugetlbfs. Rename hugetlbfs_zero_partial_page => hugetlb_zero_partial_page, move it to mm/hugetlb.c and expose it in linux/hugetlb.h. Signed-off-by: Ackerley Tng --- fs/hugetlbfs/inode.c | 27 ++------------------------- include/linux/hugetlb.h | 6 ++++++ mm/hugetlb.c | 22 ++++++++++++++++++++++ 3 files changed, 30 insertions(+), 25 deletions(-) diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 406d7366cf3e..3dab50d3ed88 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -688,29 +688,6 @@ static void hugetlb_vmtruncate(struct inode *inode, loff_t offset) remove_inode_hugepages(inode, offset, LLONG_MAX); } -static void hugetlbfs_zero_partial_page(struct hstate *h, - struct address_space *mapping, - loff_t start, - loff_t end) -{ - pgoff_t idx = start >> huge_page_shift(h); - struct folio *folio; - - folio = filemap_lock_folio(mapping, idx); - if (!folio) - return; - - start = start & ~huge_page_mask(h); - end = end & ~huge_page_mask(h); - if (!end) - end = huge_page_size(h); - - folio_zero_segment(folio, (size_t)start, (size_t)end); - - folio_unlock(folio); - folio_put(folio); -} - static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) { struct hugetlbfs_inode_info *info = HUGETLBFS_I(inode); @@ -737,7 +714,7 @@ static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) /* If range starts before first full page, zero partial page. */ if (offset < hole_start) - hugetlbfs_zero_partial_page(h, mapping, + hugetlb_zero_partial_page(h, mapping, offset, min(offset + len, hole_start)); /* Unmap users of full pages in the hole. */ @@ -750,7 +727,7 @@ static long hugetlbfs_punch_hole(struct inode *inode, loff_t offset, loff_t len) /* If range extends beyond last full page, zero partial page. */ if ((offset + len) > hole_end && (offset + len) > hole_start) - hugetlbfs_zero_partial_page(h, mapping, + hugetlb_zero_partial_page(h, mapping, hole_end, offset + len); i_mmap_unlock_write(mapping); diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 37c2edf7beea..023293ceec25 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -256,6 +256,9 @@ long hugetlb_change_protection(struct vm_area_struct *vma, bool is_hugetlb_entry_migration(pte_t pte); void hugetlb_unshare_all_pmds(struct vm_area_struct *vma); +void hugetlb_zero_partial_page(struct hstate *h, struct address_space *mapping, + loff_t start, loff_t end); + #else /* !CONFIG_HUGETLB_PAGE */ static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma) @@ -464,6 +467,9 @@ static inline vm_fault_t hugetlb_fault(struct mm_struct *mm, static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { } +static inline void hugetlb_zero_partial_page( + struct hstate *h, struct address_space *mapping, loff_t start, loff_t end) {} + #endif /* !CONFIG_HUGETLB_PAGE */ /* * hugepages at page global directory. If arch support diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 07abcb6eb203..9c9262833b4f 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -7407,6 +7407,28 @@ void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) ALIGN_DOWN(vma->vm_end, PUD_SIZE)); } +void hugetlb_zero_partial_page(struct hstate *h, + struct address_space *mapping, + loff_t start, loff_t end) +{ + pgoff_t idx = start >> huge_page_shift(h); + struct folio *folio; + + folio = filemap_lock_folio(mapping, idx); + if (!folio) + return; + + start = start & ~huge_page_mask(h); + end = end & ~huge_page_mask(h); + if (!end) + end = huge_page_size(h); + + folio_zero_segment(folio, (size_t)start, (size_t)end); + + folio_unlock(folio); + folio_put(folio); +} + #ifdef CONFIG_CMA static bool cma_reserve_called __initdata;