From nobody Mon Feb 9 06:34:49 2026 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 EBA92EB64DA for ; Mon, 26 Jun 2023 17:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231288AbjFZRPa (ORCPT ); Mon, 26 Jun 2023 13:15:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51396 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231211AbjFZROx (ORCPT ); Mon, 26 Jun 2023 13:14:53 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 8962B1729; Mon, 26 Jun 2023 10:14:47 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5BD8D143D; Mon, 26 Jun 2023 10:15:31 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.26]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 577523F663; Mon, 26 Jun 2023 10:14:44 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , "Matthew Wilcox (Oracle)" , "Kirill A. Shutemov" , Yin Fengwei , David Hildenbrand , Yu Zhao , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Christian Borntraeger , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" Cc: Ryan Roberts , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-s390@vger.kernel.org Subject: [PATCH v1 02/10] mm: pass gfp flags and order to vma_alloc_zeroed_movable_folio() Date: Mon, 26 Jun 2023 18:14:22 +0100 Message-Id: <20230626171430.3167004-3-ryan.roberts@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230626171430.3167004-1-ryan.roberts@arm.com> References: <20230626171430.3167004-1-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Allow allocation of large folios with vma_alloc_zeroed_movable_folio(). This prepares the ground for large anonymous folios. The generic implementation of vma_alloc_zeroed_movable_folio() now uses clear_huge_page() to zero the allocated folio since it may now be a non-0 order. Currently the function is always called with order 0 and no extra gfp flags, so no functional change intended. But a subsequent commit will take advantage of the new parameters to allocate large folios. The extra gfp flags will be used to control the reclaim policy. Signed-off-by: Ryan Roberts --- arch/alpha/include/asm/page.h | 5 +++-- arch/arm64/include/asm/page.h | 3 ++- arch/arm64/mm/fault.c | 7 ++++--- arch/ia64/include/asm/page.h | 5 +++-- arch/m68k/include/asm/page_no.h | 7 ++++--- arch/s390/include/asm/page.h | 5 +++-- arch/x86/include/asm/page.h | 5 +++-- include/linux/highmem.h | 23 +++++++++++++---------- mm/memory.c | 5 +++-- 9 files changed, 38 insertions(+), 27 deletions(-) diff --git a/arch/alpha/include/asm/page.h b/arch/alpha/include/asm/page.h index 4db1ebc0ed99..6fc7fe91b6cb 100644 --- a/arch/alpha/include/asm/page.h +++ b/arch/alpha/include/asm/page.h @@ -17,8 +17,9 @@ extern void clear_page(void *page); #define clear_user_page(page, vaddr, pg) clear_page(page) =20 -#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ - vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) +#define vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order) \ + vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO | (gfp), \ + order, vma, vaddr, false) =20 extern void copy_page(void * _to, void * _from); #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h index 2312e6ee595f..47710852f872 100644 --- a/arch/arm64/include/asm/page.h +++ b/arch/arm64/include/asm/page.h @@ -30,7 +30,8 @@ void copy_highpage(struct page *to, struct page *from); #define __HAVE_ARCH_COPY_HIGHPAGE =20 struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma, - unsigned long vaddr); + unsigned long vaddr, + gfp_t gfp, int order); #define vma_alloc_zeroed_movable_folio vma_alloc_zeroed_movable_folio =20 void tag_clear_highpage(struct page *to); diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index 6045a5117ac1..0a43c3b3f190 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -961,9 +961,10 @@ NOKPROBE_SYMBOL(do_debug_exception); * Used during anonymous page fault handling. */ struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma, - unsigned long vaddr) + unsigned long vaddr, + gfp_t gfp, int order) { - gfp_t flags =3D GFP_HIGHUSER_MOVABLE | __GFP_ZERO; + gfp_t flags =3D GFP_HIGHUSER_MOVABLE | __GFP_ZERO | gfp; =20 /* * If the page is mapped with PROT_MTE, initialise the tags at the @@ -973,7 +974,7 @@ struct folio *vma_alloc_zeroed_movable_folio(struct vm_= area_struct *vma, if (vma->vm_flags & VM_MTE) flags |=3D __GFP_ZEROTAGS; =20 - return vma_alloc_folio(flags, 0, vma, vaddr, false); + return vma_alloc_folio(flags, order, vma, vaddr, false); } =20 void tag_clear_highpage(struct page *page) diff --git a/arch/ia64/include/asm/page.h b/arch/ia64/include/asm/page.h index 310b09c3342d..ebdf04274023 100644 --- a/arch/ia64/include/asm/page.h +++ b/arch/ia64/include/asm/page.h @@ -82,10 +82,11 @@ do { \ } while (0) =20 =20 -#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ +#define vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order) \ ({ \ struct folio *folio =3D vma_alloc_folio( \ - GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false); \ + GFP_HIGHUSER_MOVABLE | __GFP_ZERO | (gfp), \ + order, vma, vaddr, false); \ if (folio) \ flush_dcache_folio(folio); \ folio; \ diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_n= o.h index 060e4c0e7605..4a2fe57fef5e 100644 --- a/arch/m68k/include/asm/page_no.h +++ b/arch/m68k/include/asm/page_no.h @@ -3,7 +3,7 @@ #define _M68K_PAGE_NO_H =20 #ifndef __ASSEMBLY__ -=20 + extern unsigned long memory_start; extern unsigned long memory_end; =20 @@ -13,8 +13,9 @@ extern unsigned long memory_end; #define clear_user_page(page, vaddr, pg) clear_page(page) #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) =20 -#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ - vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) +#define vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order) \ + vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO | (gfp), \ + order, vma, vaddr, false) =20 #define __pa(vaddr) ((unsigned long)(vaddr)) #define __va(paddr) ((void *)((unsigned long)(paddr))) diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h index 8a2a3b5d1e29..b749564140f1 100644 --- a/arch/s390/include/asm/page.h +++ b/arch/s390/include/asm/page.h @@ -73,8 +73,9 @@ static inline void copy_page(void *to, void *from) #define clear_user_page(page, vaddr, pg) clear_page(page) #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) =20 -#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ - vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) +#define vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order) \ + vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO | (gfp), \ + order, vma, vaddr, false) =20 /* * These are used to make use of C type-checking.. diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h index d18e5c332cb9..34deab1a8dae 100644 --- a/arch/x86/include/asm/page.h +++ b/arch/x86/include/asm/page.h @@ -34,8 +34,9 @@ static inline void copy_user_page(void *to, void *from, u= nsigned long vaddr, copy_page(to, from); } =20 -#define vma_alloc_zeroed_movable_folio(vma, vaddr) \ - vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr, false) +#define vma_alloc_zeroed_movable_folio(vma, vaddr, gfp, order) \ + vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO | (gfp), \ + order, vma, vaddr, false) =20 #ifndef __pa #define __pa(x) __phys_addr((unsigned long)(x)) diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 4de1dbcd3ef6..b9a9b0340557 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -209,26 +209,29 @@ static inline void clear_user_highpage(struct page *p= age, unsigned long vaddr) =20 #ifndef vma_alloc_zeroed_movable_folio /** - * vma_alloc_zeroed_movable_folio - Allocate a zeroed page for a VMA. - * @vma: The VMA the page is to be allocated for. - * @vaddr: The virtual address the page will be inserted into. - * - * This function will allocate a page suitable for inserting into this - * VMA at this virtual address. It may be allocated from highmem or + * vma_alloc_zeroed_movable_folio - Allocate a zeroed folio for a VMA. + * @vma: The start VMA the folio is to be allocated for. + * @vaddr: The virtual address the folio will be inserted into. + * @gfp: Additional gfp falgs to mix in or 0. + * @order: The order of the folio (2^order pages). + * + * This function will allocate a folio suitable for inserting into this + * VMA starting at this virtual address. It may be allocated from highmem= or * the movable zone. An architecture may provide its own implementation. * - * Return: A folio containing one allocated and zeroed page or NULL if + * Return: A folio containing 2^order allocated and zeroed pages or NULL if * we are out of memory. */ static inline struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma, - unsigned long vaddr) + unsigned long vaddr, gfp_t gfp, int order) { struct folio *folio; =20 - folio =3D vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0, vma, vaddr, false); + folio =3D vma_alloc_folio(GFP_HIGHUSER_MOVABLE | gfp, + order, vma, vaddr, false); if (folio) - clear_user_highpage(&folio->page, vaddr); + clear_huge_page(&folio->page, vaddr, 1U << order); =20 return folio; } diff --git a/mm/memory.c b/mm/memory.c index 3d4ea668c4d1..367bbbb29d91 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3073,7 +3073,8 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) goto oom; =20 if (is_zero_pfn(pte_pfn(vmf->orig_pte))) { - new_folio =3D vma_alloc_zeroed_movable_folio(vma, vmf->address); + new_folio =3D vma_alloc_zeroed_movable_folio(vma, vmf->address, + 0, 0); if (!new_folio) goto oom; } else { @@ -4087,7 +4088,7 @@ static vm_fault_t do_anonymous_page(struct vm_fault *= vmf) /* Allocate our own private page. */ if (unlikely(anon_vma_prepare(vma))) goto oom; - folio =3D vma_alloc_zeroed_movable_folio(vma, vmf->address); + folio =3D vma_alloc_zeroed_movable_folio(vma, vmf->address, 0, 0); if (!folio) goto oom; =20 --=20 2.25.1