From patchwork Wed Jul 6 08:59:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baolin Wang X-Patchwork-Id: 12907608 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 386FCCCA47C for ; Wed, 6 Jul 2022 08:59:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232622AbiGFI7n (ORCPT ); Wed, 6 Jul 2022 04:59:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232354AbiGFI7f (ORCPT ); Wed, 6 Jul 2022 04:59:35 -0400 Received: from out30-54.freemail.mail.aliyun.com (out30-54.freemail.mail.aliyun.com [115.124.30.54]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D159E2B9; Wed, 6 Jul 2022 01:59:33 -0700 (PDT) X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=ay29a033018045168;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=33;SR=0;TI=SMTPD_---0VIXgrTG_1657097965; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0VIXgrTG_1657097965) by smtp.aliyun-inc.com; Wed, 06 Jul 2022 16:59:26 +0800 From: Baolin Wang To: akpm@linux-foundation.org Cc: rppt@linux.ibm.com, willy@infradead.org, will@kernel.org, aneesh.kumar@linux.ibm.com, npiggin@gmail.com, peterz@infradead.org, catalin.marinas@arm.com, chenhuacai@kernel.org, kernel@xen0n.name, tsbogend@alpha.franken.de, dave.hansen@linux.intel.com, luto@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, arnd@arndb.de, guoren@kernel.org, monstr@monstr.eu, jonas@southpole.se, stefan.kristiansson@saunalahti.fi, shorne@gmail.com, baolin.wang@linux.alibaba.com, x86@kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-csky@vger.kernel.org, openrisc@lists.librecores.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/3] mm: Add PUD level pagetable account Date: Wed, 6 Jul 2022 16:59:16 +0800 Message-Id: <6c7316e17ccf8d9343c5f703c272df51346b44fa.1657096412.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: References: In-Reply-To: References: Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Now the PUD level ptes are always protected by mm->page_table_lock, which means no split pagetable lock needed. So the generic PUD level pagetable pages allocation will not call pgtable_pte_page_ctor/dtor(), that means we will miss to account PUD level pagetable pages. So introducing pgtable_pud_page_ctor/dtor(), which are just wrappers of page_{set,clear}_pgtable() to help to get an accurate PUD pagetable accounting, when allocating or freeing PUD level pagetable pages. Moreover this patch will also mark the PUD level pagetable with PG_table flag, which will help to do sanity validation in unpoison_memory() and get more accurate pagetable accounting by /proc/kpageflags interface. Meanwhile converting the architectures with using generic PUD pagatable allocation to add corresponding pgtable_pud_page_ctor() or pgtable_pud_page_dtor() to account PUD level pagetable. Signed-off-by: Baolin Wang --- arch/arm64/include/asm/tlb.h | 5 ++++- arch/loongarch/include/asm/pgalloc.h | 12 +++++++++--- arch/mips/include/asm/pgalloc.h | 12 +++++++++--- arch/x86/mm/pgtable.c | 5 ++++- include/asm-generic/pgalloc.h | 12 ++++++++++-- include/linux/mm.h | 10 ++++++++++ 6 files changed, 46 insertions(+), 10 deletions(-) diff --git a/arch/arm64/include/asm/tlb.h b/arch/arm64/include/asm/tlb.h index c995d1f..6665f33 100644 --- a/arch/arm64/include/asm/tlb.h +++ b/arch/arm64/include/asm/tlb.h @@ -94,7 +94,10 @@ static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp, unsigned long addr) { - tlb_remove_table(tlb, virt_to_page(pudp)); + struct page *page = virt_to_page(pudp); + + pgtable_pud_page_dtor(page); + tlb_remove_table(tlb, page); } #endif diff --git a/arch/loongarch/include/asm/pgalloc.h b/arch/loongarch/include/asm/pgalloc.h index 4bfeb3c..8138101 100644 --- a/arch/loongarch/include/asm/pgalloc.h +++ b/arch/loongarch/include/asm/pgalloc.h @@ -89,10 +89,16 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) { pud_t *pud; + struct page *page; + + page = alloc_page(GFP_KERNEL); + if (!page) + return NULL; + + pgtable_pud_page_ctor(page); + pud = (pud_t *)page_address(page); + pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); - pud = (pud_t *) __get_free_page(GFP_KERNEL); - if (pud) - pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); return pud; } diff --git a/arch/mips/include/asm/pgalloc.h b/arch/mips/include/asm/pgalloc.h index 7960357..5da5880 100644 --- a/arch/mips/include/asm/pgalloc.h +++ b/arch/mips/include/asm/pgalloc.h @@ -89,11 +89,17 @@ static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address) static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long address) { + struct page *page; pud_t *pud; - pud = (pud_t *) __get_free_pages(GFP_KERNEL, PUD_TABLE_ORDER); - if (pud) - pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); + page = alloc_pages(GFP_KERNEL, PUD_TABLE_ORDER); + if (!page) + return NULL; + + pgtable_pud_page_ctor(page); + pud = (pud_t *)page_address(page); + pud_init((unsigned long)pud, (unsigned long)invalid_pmd_table); + return pud; } diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index a932d77..ea39670 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -76,8 +76,11 @@ void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd) #if CONFIG_PGTABLE_LEVELS > 3 void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud) { + struct page *page = virt_to_page(pud); + + pgtable_pud_page_dtor(page); paravirt_release_pud(__pa(pud) >> PAGE_SHIFT); - paravirt_tlb_remove_table(tlb, virt_to_page(pud)); + paravirt_tlb_remove_table(tlb, page); } #if CONFIG_PGTABLE_LEVELS > 4 diff --git a/include/asm-generic/pgalloc.h b/include/asm-generic/pgalloc.h index 977bea1..8ce8d7c 100644 --- a/include/asm-generic/pgalloc.h +++ b/include/asm-generic/pgalloc.h @@ -149,11 +149,16 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) static inline pud_t *__pud_alloc_one(struct mm_struct *mm, unsigned long addr) { + struct page *page; gfp_t gfp = GFP_PGTABLE_USER; if (mm == &init_mm) gfp = GFP_PGTABLE_KERNEL; - return (pud_t *)get_zeroed_page(gfp); + page = alloc_pages(gfp, 0); + if (!page) + return NULL; + pgtable_pud_page_ctor(page); + return (pud_t *)page_address(page); } #ifndef __HAVE_ARCH_PUD_ALLOC_ONE @@ -174,8 +179,11 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) static inline void __pud_free(struct mm_struct *mm, pud_t *pud) { + struct page *page = virt_to_page(pud); + BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); - free_page((unsigned long)pud); + pgtable_pud_page_dtor(page); + __free_page(page); } #ifndef __HAVE_ARCH_PUD_FREE diff --git a/include/linux/mm.h b/include/linux/mm.h index 7894bc5..54ed6f7 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2364,6 +2364,16 @@ static inline void page_clear_pgtable(struct page *page) dec_lruvec_page_state(page, NR_PAGETABLE); } +static inline void pgtable_pud_page_ctor(struct page *page) +{ + page_set_pgtable(page); +} + +static inline void pgtable_pud_page_dtor(struct page *page) +{ + page_clear_pgtable(page); +} + static inline bool pgtable_pte_page_ctor(struct page *page) { if (!ptlock_init(page))