From patchwork Mon Mar 3 16:30:00 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13999184 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 39245248863 for ; Mon, 3 Mar 2025 16:30:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019448; cv=none; b=IOpeiboXzKPehfcsw3AM8pwlDzYod46Nb3LXeRI+i/4H70IRBVT+MuPVxggY9BAsC3vOycahYMQDr4zhNLksY91cUpp+NrtPQ0ci/W6Vaa7LUXnHIkT5T2pfpfj4D96W4xGmE3ZSavuk/JKxuX3MCHO9oktKSqPgB02f3ogIpFc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741019448; c=relaxed/simple; bh=d9bRuBXmVv0p2a7zWAANlT4EIsScBcQtDcfcUcIlMKQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ODzSMLxQBkkugYF7f7pbCCNhTpdsFMoDnj4dErPwGw5Ht9jCiOgqoOnJ8KycSLUR2erssAp1LiZUIb2yu9RXHlA6bv1PFpB+SuBPBXYuNh/wZot9/+R7BDSDifttzKpMmyftPHpRciaI7aHX0te7B3F+RCqZf5DpdmrRcvBV8cQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=cAgDtyWK; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cAgDtyWK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1741019445; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=6obLj5/+7cSJHkmjj4/LIEhJkcwhtMxgxzLmveILbME=; b=cAgDtyWKS2mAs+tB7173SeZYRh2yJhMtF92cCEOdWJ+66ktpp7dIcAYFf1ecN1nju4w272 3wqyIrwD/76ze1sCbjVSZruR0x7QnK0RZhpeqaZKP6RLLY/c/hIlsfWYXMNpZcbatgprCN WTCRH3sg+XJ66deyRuwbd6MVi7hHb0I= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-648-l7H3YMLXP32yI35lrMPo6w-1; Mon, 03 Mar 2025 11:30:33 -0500 X-MC-Unique: l7H3YMLXP32yI35lrMPo6w-1 X-Mimecast-MFC-AGG-ID: l7H3YMLXP32yI35lrMPo6w_1741019433 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-3910b93cb1eso462948f8f.1 for ; Mon, 03 Mar 2025 08:30:33 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1741019432; x=1741624232; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=6obLj5/+7cSJHkmjj4/LIEhJkcwhtMxgxzLmveILbME=; b=D/O0qJGTK63vADJZxSRVCT1QLtO1YxzvSQWQYZskVbTEBan71+4Nj+IaihlO5BQ1+Z KBf9xdIh447B8ytcSDnogjrRfJTkNEytWWsNCXdxIAes20bMcZ6a94X7mv2Rv/5QLX1X 1lC1pYZ3rzDtjOYM+SEC1Ja/bOS+Q80bcPdRmJj/9s8+WEnap5NU6pX/1j/acw+talW7 CsZpo2VPgL53LAR5Nl5r98gRrdkNwvxDB74Gpul4LjKs4yPazeP1sPfR+SEtzfV7CMD5 N6dJs92Vun5ivMdWHSNd71IAJhlR9QaH1mMDOS+zIKj7be/XhYoGTRNIdsyrxKedDYLv ddAg== X-Forwarded-Encrypted: i=1; AJvYcCWIURo6g64kuDruEayXiCa61apelS3MCH48iDvzNgxrWCSzIFmhX7r+rbgnJQ6S5RTXyZ3nNlwUZgCm32fd@vger.kernel.org X-Gm-Message-State: AOJu0YxIi9JVWUhOhlISJTVFT9xwI5OIaZsk0gyizWvPJX2nerKX8had hz2a7RgI/RsKwdMKpV1lXaaXnubdu2s1gUe9IBXD8YAU6mR4PaNKMgW12vEHhF0cK+JCc4eJDe9 6RegfzU9MIaSSGBY+fX9CzWNiIhkJNr1QU83xnvxDQIV6fz9oJ85IQ8GB6ogiN+0= X-Gm-Gg: ASbGncuCW+Ixh3IMaJTD6nSq2efVMRajLDe0+oyz2JvicmIDSq9ki2LVF3R5lE7FkLy nKCkL23YaCclWl4aDQ9o38JGxqVcf0vM/8vqvE/BllZFEiBi+9DWn656ntqlMQmJeloypqyQ5jp 9yFmkdqJbk0bkFoJ6DTCS2LPwp5DAu+BW5qbDeu0kg3Nq9j0ScbVffu7urmmalPZFx+v+XUBGBJ aQdMeHaKW233Y5ypqAjOJLFgvqki2A+TJfWIgZVoi759jGhejWN87cnoID8ZdtKKlMw9nFq48W/ 0giMgS+Tc2ouOw8VCvDUTHta9U/MM+QXdbLHzdTeTXFMoPnHwN0TA7fu3WK7qY+3FJkmVCKu5Ro + X-Received: by 2002:a05:6000:21c6:b0:390:fd23:c145 with SMTP id ffacd0b85a97d-390fd23c2c2mr4404035f8f.36.1741019432580; Mon, 03 Mar 2025 08:30:32 -0800 (PST) X-Google-Smtp-Source: AGHT+IG8V3sUJRCUTqrZLWnaeVZz5cWv6qO720rAawUL8eI33aPl04j18jrwhTf4sp/MF8gqzp2DbA== X-Received: by 2002:a05:6000:21c6:b0:390:fd23:c145 with SMTP id ffacd0b85a97d-390fd23c2c2mr4403996f8f.36.1741019432210; Mon, 03 Mar 2025 08:30:32 -0800 (PST) Received: from localhost (p200300cbc7349600af274326a2162bfb.dip0.t-ipconnect.de. [2003:cb:c734:9600:af27:4326:a216:2bfb]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-43bbfece041sm38658125e9.1.2025.03.03.08.30.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 03 Mar 2025 08:30:31 -0800 (PST) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-doc@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org, David Hildenbrand , Andrew Morton , "Matthew Wilcox (Oracle)" , Tejun Heo , Zefan Li , Johannes Weiner , =?utf-8?q?Michal_Koutn=C3=BD?= , Jonathan Corbet , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Muchun Song , "Liam R. Howlett" , Lorenzo Stoakes , Vlastimil Babka , Jann Horn Subject: [PATCH v3 07/20] mm/rmap: pass dst_vma to folio_dup_file_rmap_pte() and friends Date: Mon, 3 Mar 2025 17:30:00 +0100 Message-ID: <20250303163014.1128035-8-david@redhat.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250303163014.1128035-1-david@redhat.com> References: <20250303163014.1128035-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We'll need access to the destination MM when modifying the large mapcount of a non-hugetlb large folios next. So pass in the destination VMA. Signed-off-by: David Hildenbrand --- include/linux/rmap.h | 42 +++++++++++++++++++++++++----------------- mm/huge_memory.c | 2 +- mm/memory.c | 10 +++++----- 3 files changed, 31 insertions(+), 23 deletions(-) diff --git a/include/linux/rmap.h b/include/linux/rmap.h index 6abf7960077aa..e795610bade80 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -335,7 +335,8 @@ static inline void hugetlb_remove_rmap(struct folio *folio) } static __always_inline void __folio_dup_file_rmap(struct folio *folio, - struct page *page, int nr_pages, enum rmap_level level) + struct page *page, int nr_pages, struct vm_area_struct *dst_vma, + enum rmap_level level) { const int orig_nr_pages = nr_pages; @@ -366,45 +367,47 @@ static __always_inline void __folio_dup_file_rmap(struct folio *folio, * @folio: The folio to duplicate the mappings of * @page: The first page to duplicate the mappings of * @nr_pages: The number of pages of which the mapping will be duplicated + * @dst_vma: The destination vm area * * The page range of the folio is defined by [page, page + nr_pages) * * The caller needs to hold the page table lock. */ static inline void folio_dup_file_rmap_ptes(struct folio *folio, - struct page *page, int nr_pages) + struct page *page, int nr_pages, struct vm_area_struct *dst_vma) { - __folio_dup_file_rmap(folio, page, nr_pages, RMAP_LEVEL_PTE); + __folio_dup_file_rmap(folio, page, nr_pages, dst_vma, RMAP_LEVEL_PTE); } static __always_inline void folio_dup_file_rmap_pte(struct folio *folio, - struct page *page) + struct page *page, struct vm_area_struct *dst_vma) { - __folio_dup_file_rmap(folio, page, 1, RMAP_LEVEL_PTE); + __folio_dup_file_rmap(folio, page, 1, dst_vma, RMAP_LEVEL_PTE); } /** * folio_dup_file_rmap_pmd - duplicate a PMD mapping of a page range of a folio * @folio: The folio to duplicate the mapping of * @page: The first page to duplicate the mapping of + * @dst_vma: The destination vm area * * The page range of the folio is defined by [page, page + HPAGE_PMD_NR) * * The caller needs to hold the page table lock. */ static inline void folio_dup_file_rmap_pmd(struct folio *folio, - struct page *page) + struct page *page, struct vm_area_struct *dst_vma) { #ifdef CONFIG_TRANSPARENT_HUGEPAGE - __folio_dup_file_rmap(folio, page, HPAGE_PMD_NR, RMAP_LEVEL_PTE); + __folio_dup_file_rmap(folio, page, HPAGE_PMD_NR, dst_vma, RMAP_LEVEL_PTE); #else WARN_ON_ONCE(true); #endif } static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio, - struct page *page, int nr_pages, struct vm_area_struct *src_vma, - enum rmap_level level) + struct page *page, int nr_pages, struct vm_area_struct *dst_vma, + struct vm_area_struct *src_vma, enum rmap_level level) { const int orig_nr_pages = nr_pages; bool maybe_pinned; @@ -470,6 +473,7 @@ static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio, * @folio: The folio to duplicate the mappings of * @page: The first page to duplicate the mappings of * @nr_pages: The number of pages of which the mapping will be duplicated + * @dst_vma: The destination vm area * @src_vma: The vm area from which the mappings are duplicated * * The page range of the folio is defined by [page, page + nr_pages) @@ -488,16 +492,18 @@ static __always_inline int __folio_try_dup_anon_rmap(struct folio *folio, * Returns 0 if duplicating the mappings succeeded. Returns -EBUSY otherwise. */ static inline int folio_try_dup_anon_rmap_ptes(struct folio *folio, - struct page *page, int nr_pages, struct vm_area_struct *src_vma) + struct page *page, int nr_pages, struct vm_area_struct *dst_vma, + struct vm_area_struct *src_vma) { - return __folio_try_dup_anon_rmap(folio, page, nr_pages, src_vma, - RMAP_LEVEL_PTE); + return __folio_try_dup_anon_rmap(folio, page, nr_pages, dst_vma, + src_vma, RMAP_LEVEL_PTE); } static __always_inline int folio_try_dup_anon_rmap_pte(struct folio *folio, - struct page *page, struct vm_area_struct *src_vma) + struct page *page, struct vm_area_struct *dst_vma, + struct vm_area_struct *src_vma) { - return __folio_try_dup_anon_rmap(folio, page, 1, src_vma, + return __folio_try_dup_anon_rmap(folio, page, 1, dst_vma, src_vma, RMAP_LEVEL_PTE); } @@ -506,6 +512,7 @@ static __always_inline int folio_try_dup_anon_rmap_pte(struct folio *folio, * of a folio * @folio: The folio to duplicate the mapping of * @page: The first page to duplicate the mapping of + * @dst_vma: The destination vm area * @src_vma: The vm area from which the mapping is duplicated * * The page range of the folio is defined by [page, page + HPAGE_PMD_NR) @@ -524,11 +531,12 @@ static __always_inline int folio_try_dup_anon_rmap_pte(struct folio *folio, * Returns 0 if duplicating the mapping succeeded. Returns -EBUSY otherwise. */ static inline int folio_try_dup_anon_rmap_pmd(struct folio *folio, - struct page *page, struct vm_area_struct *src_vma) + struct page *page, struct vm_area_struct *dst_vma, + struct vm_area_struct *src_vma) { #ifdef CONFIG_TRANSPARENT_HUGEPAGE - return __folio_try_dup_anon_rmap(folio, page, HPAGE_PMD_NR, src_vma, - RMAP_LEVEL_PMD); + return __folio_try_dup_anon_rmap(folio, page, HPAGE_PMD_NR, dst_vma, + src_vma, RMAP_LEVEL_PMD); #else WARN_ON_ONCE(true); return -EBUSY; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 07d43ca6db1c6..8e8b07e8b12fe 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1782,7 +1782,7 @@ int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm, src_folio = page_folio(src_page); folio_get(src_folio); - if (unlikely(folio_try_dup_anon_rmap_pmd(src_folio, src_page, src_vma))) { + if (unlikely(folio_try_dup_anon_rmap_pmd(src_folio, src_page, dst_vma, src_vma))) { /* Page maybe pinned: split and retry the fault on PTEs. */ folio_put(src_folio); pte_free(dst_mm, pgtable); diff --git a/mm/memory.c b/mm/memory.c index 1efc393e32b6d..73b783c7d7d51 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -866,7 +866,7 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, folio_get(folio); rss[mm_counter(folio)]++; /* Cannot fail as these pages cannot get pinned. */ - folio_try_dup_anon_rmap_pte(folio, page, src_vma); + folio_try_dup_anon_rmap_pte(folio, page, dst_vma, src_vma); /* * We do not preserve soft-dirty information, because so @@ -1020,14 +1020,14 @@ copy_present_ptes(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma folio_ref_add(folio, nr); if (folio_test_anon(folio)) { if (unlikely(folio_try_dup_anon_rmap_ptes(folio, page, - nr, src_vma))) { + nr, dst_vma, src_vma))) { folio_ref_sub(folio, nr); return -EAGAIN; } rss[MM_ANONPAGES] += nr; VM_WARN_ON_FOLIO(PageAnonExclusive(page), folio); } else { - folio_dup_file_rmap_ptes(folio, page, nr); + folio_dup_file_rmap_ptes(folio, page, nr, dst_vma); rss[mm_counter_file(folio)] += nr; } if (any_writable) @@ -1045,7 +1045,7 @@ copy_present_ptes(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma * guarantee the pinned page won't be randomly replaced in the * future. */ - if (unlikely(folio_try_dup_anon_rmap_pte(folio, page, src_vma))) { + if (unlikely(folio_try_dup_anon_rmap_pte(folio, page, dst_vma, src_vma))) { /* Page may be pinned, we have to copy. */ folio_put(folio); err = copy_present_page(dst_vma, src_vma, dst_pte, src_pte, @@ -1055,7 +1055,7 @@ copy_present_ptes(struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma rss[MM_ANONPAGES]++; VM_WARN_ON_FOLIO(PageAnonExclusive(page), folio); } else { - folio_dup_file_rmap_pte(folio, page); + folio_dup_file_rmap_pte(folio, page, dst_vma); rss[mm_counter_file(folio)]++; }