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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A068CD3E79C for ; Thu, 11 Dec 2025 08:17:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/ea6etQCpReM0Dd5R3qfwP463Goog5MVH76oxL1v2kk=; b=J766Et2dF/sMv2fViyQkEyMkkB tdBbqBRfUfbIeRgBrn6fCzqwUDl8CAm1TAdFTe5KtO+RR59SNZJMywfksnWjumcU7cChBOPPTJusp gwkPMmQ7OS3mfnk6BCjFZbmPVMSehmvxJtvxTZdaiVMaom+r5fovoxeGE7flrNdoBzClNEiGOl7X1 TzdpBQn4Uxfno4QgCPhvDsxPIx0JhXNAZuH7db7USryj7kPxCjVZsqyy7koHjiW/UBOBwRgdgk67h 5PsttGs2BEe8ZxfIQ5lKpZV7yY1i4AluRnN9uA+gihjiztPoUWhtVuWuuumhqVaICsroTTOleHdW3 aE1kTUMA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vTbra-0000000GN1l-2Wz3; Thu, 11 Dec 2025 08:17:26 +0000 Received: from out30-99.freemail.mail.aliyun.com ([115.124.30.99]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vTbrT-0000000GMxg-0ls6 for linux-arm-kernel@lists.infradead.org; Thu, 11 Dec 2025 08:17:22 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1765441032; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=/ea6etQCpReM0Dd5R3qfwP463Goog5MVH76oxL1v2kk=; b=cbOqi1BmJlR3HeCWfRata3dM8PlfIC8sss/Oz9J9NrF8666xT8cH8zu5mEMSH6/k0NMTZWL1dNHWUX0yD2GZIzaFSVcjmZWMsmENwumzxS03lgFOnicbPHW8IwpLArzqc3tNVi7/b0UtHgMtB21urPYtnlLaimHfUOeWfv0GNhk= Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0WuZnGbv_1765441030 cluster:ay36) by smtp.aliyun-inc.com; Thu, 11 Dec 2025 16:17:11 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.org, catalin.marinas@arm.com, will@kernel.org Cc: lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, riel@surriel.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/3] arm64: mm: support batch clearing of the young flag for large folios Date: Thu, 11 Dec 2025 16:16:54 +0800 Message-ID: X-Mailer: git-send-email 2.43.7 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251211_001719_712158_360F5039 X-CRM114-Status: GOOD ( 12.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Currently, contpte_ptep_test_and_clear_young() and contpte_ptep_clear_flush_young() only clear the young flag and flush TLBs for PTEs within the contiguous range. To support batch PTE operations for other sized large folios in the following patches, adding a new parameter to specify the number of PTEs. While we are at it, rename the functions to maintain consistency with other contpte_*() functions. Signed-off-by: Baolin Wang --- arch/arm64/include/asm/pgtable.h | 12 ++++----- arch/arm64/mm/contpte.c | 44 ++++++++++++++++++++++---------- 2 files changed, 37 insertions(+), 19 deletions(-) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 0944e296dd4a..e03034683156 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -1679,10 +1679,10 @@ extern void contpte_clear_full_ptes(struct mm_struct *mm, unsigned long addr, extern pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr, int full); -extern int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); -extern int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep); +extern int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); +extern int contpte_clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, unsigned int nr); extern void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr); extern int contpte_ptep_set_access_flags(struct vm_area_struct *vma, @@ -1854,7 +1854,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, if (likely(!pte_valid_cont(orig_pte))) return __ptep_test_and_clear_young(vma, addr, ptep); - return contpte_ptep_test_and_clear_young(vma, addr, ptep); + return contpte_test_and_clear_young_ptes(vma, addr, ptep, CONT_PTES); } #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH @@ -1866,7 +1866,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, if (likely(!pte_valid_cont(orig_pte))) return __ptep_clear_flush_young(vma, addr, ptep); - return contpte_ptep_clear_flush_young(vma, addr, ptep); + return contpte_clear_flush_young_ptes(vma, addr, ptep, CONT_PTES); } #define wrprotect_ptes wrprotect_ptes diff --git a/arch/arm64/mm/contpte.c b/arch/arm64/mm/contpte.c index c0557945939c..19b122441be3 100644 --- a/arch/arm64/mm/contpte.c +++ b/arch/arm64/mm/contpte.c @@ -488,8 +488,9 @@ pte_t contpte_get_and_clear_full_ptes(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(contpte_get_and_clear_full_ptes); -int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) +int contpte_test_and_clear_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) { /* * ptep_clear_flush_young() technically requires us to clear the access @@ -500,39 +501,56 @@ int contpte_ptep_test_and_clear_young(struct vm_area_struct *vma, * having to unfold. */ + unsigned long start = addr; + unsigned long end = start + nr * PAGE_SIZE; int young = 0; int i; - ptep = contpte_align_down(ptep); - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); + if (pte_cont(__ptep_get(ptep + nr - 1))) + end = ALIGN(end, CONT_PTE_SIZE); - for (i = 0; i < CONT_PTES; i++, ptep++, addr += PAGE_SIZE) - young |= __ptep_test_and_clear_young(vma, addr, ptep); + if (pte_cont(__ptep_get(ptep))) { + start = ALIGN_DOWN(start, CONT_PTE_SIZE); + ptep = contpte_align_down(ptep); + } + + nr = (end - start) / PAGE_SIZE; + for (i = 0; i < nr; i++, ptep++, start += PAGE_SIZE) + young |= __ptep_test_and_clear_young(vma, start, ptep); return young; } -EXPORT_SYMBOL_GPL(contpte_ptep_test_and_clear_young); +EXPORT_SYMBOL_GPL(contpte_test_and_clear_young_ptes); -int contpte_ptep_clear_flush_young(struct vm_area_struct *vma, - unsigned long addr, pte_t *ptep) +int contpte_clear_flush_young_ptes(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + unsigned int nr) { int young; - young = contpte_ptep_test_and_clear_young(vma, addr, ptep); + young = contpte_test_and_clear_young_ptes(vma, addr, ptep, nr); if (young) { + unsigned long start = addr; + unsigned long end = start + nr * PAGE_SIZE; + + if (pte_cont(__ptep_get(ptep + nr - 1))) + end = ALIGN(end, CONT_PTE_SIZE); + + if (pte_cont(__ptep_get(ptep))) + start = ALIGN_DOWN(start, CONT_PTE_SIZE); + /* * See comment in __ptep_clear_flush_young(); same rationale for * eliding the trailing DSB applies here. */ - addr = ALIGN_DOWN(addr, CONT_PTE_SIZE); - __flush_tlb_range_nosync(vma->vm_mm, addr, addr + CONT_PTE_SIZE, + __flush_tlb_range_nosync(vma->vm_mm, start, end, PAGE_SIZE, true, 3); } return young; } -EXPORT_SYMBOL_GPL(contpte_ptep_clear_flush_young); +EXPORT_SYMBOL_GPL(contpte_clear_flush_young_ptes); void contpte_wrprotect_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, unsigned int nr) -- 2.47.3