From: Yu Zhao <yuzhao@google.com> To: linux-mm@kvack.org Cc: Alex Shi <alexs@kernel.org>, Andi Kleen <ak@linux.intel.com>, Andrew Morton <akpm@linux-foundation.org>, Benjamin Manes <ben.manes@gmail.com>, Dave Chinner <david@fromorbit.com>, Dave Hansen <dave.hansen@linux.intel.com>, Hillf Danton <hdanton@sina.com>, Jens Axboe <axboe@kernel.dk>, Johannes Weiner <hannes@cmpxchg.org>, Jonathan Corbet <corbet@lwn.net>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Matthew Wilcox <willy@infradead.org>, Mel Gorman <mgorman@suse.de>, Miaohe Lin <linmiaohe@huawei.com>, Michael Larabel <michael@michaellarabel.com>, Michal Hocko <mhocko@suse.com>, Michel Lespinasse <michel@lespinasse.org>, Rik van Riel <riel@surriel.com>, Roman Gushchin <guro@fb.com>, Rong Chen <rong.a.chen@intel.com>, SeongJae Park <sjpark@amazon.de>, Tim Chen <tim.c.chen@linux.intel.com>, Vlastimil Babka <vbabka@suse.cz>, Yang Shi <shy828301@gmail.com>, Ying Huang <ying.huang@intel.com>, Zi Yan <ziy@nvidia.com>, linux-kernel@vger.kernel.org, lkp@lists.01.org, page-reclaim@google.com, Yu Zhao <yuzhao@google.com> Subject: [PATCH v2 06/16] mm, x86: support the access bit on non-leaf PMD entries Date: Tue, 13 Apr 2021 00:56:23 -0600 [thread overview] Message-ID: <20210413065633.2782273-7-yuzhao@google.com> (raw) In-Reply-To: <20210413065633.2782273-1-yuzhao@google.com> Some architectures support the accessed bit on non-leaf PMD entries (parents) in addition to leaf PTE entries (children) where pages are mapped, e.g., x86_64 sets the accessed bit on a parent when using it as part of linear-address translation [1]. Page table walkers who are interested in the accessed bit on children can take advantage of this: they do not need to search the children when the accessed bit is not set on a parent, given that they have previously cleared the accessed bit on this parent. [1]: Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3 (October 2019), section 4.8 Signed-off-by: Yu Zhao <yuzhao@google.com> --- arch/Kconfig | 9 +++++++++ arch/x86/Kconfig | 1 + arch/x86/include/asm/pgtable.h | 2 +- arch/x86/mm/pgtable.c | 5 ++++- include/linux/pgtable.h | 4 ++-- 5 files changed, 17 insertions(+), 4 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index ecfd3520b676..cbd7f66734ee 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -782,6 +782,15 @@ config HAVE_ARCH_TRANSPARENT_HUGEPAGE config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD bool +config HAVE_ARCH_PARENT_PMD_YOUNG + bool + depends on PGTABLE_LEVELS > 2 + help + Architectures that select this are able to set the accessed bit on + non-leaf PMD entries in addition to leaf PTE entries where pages are + mapped. For them, page table walkers that clear the accessed bit may + stop at non-leaf PMD entries when they do not see the accessed bit. + config HAVE_ARCH_HUGE_VMAP bool diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2792879d398e..b5972eb82337 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -163,6 +163,7 @@ config X86 select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64 + select HAVE_ARCH_PARENT_PMD_YOUNG if X86_64 select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD select HAVE_ARCH_VMAP_STACK if X86_64 select HAVE_ARCH_WITHIN_STACK_FRAMES diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index a02c67291cfc..a6b5cfe1fc5a 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -846,7 +846,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) static inline int pmd_bad(pmd_t pmd) { - return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; + return ((pmd_flags(pmd) | _PAGE_ACCESSED) & ~_PAGE_USER) != _KERNPG_TABLE; } static inline unsigned long pages_to_mb(unsigned long npg) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index f6a9e2e36642..1c27e6f43f80 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -550,7 +550,7 @@ int ptep_test_and_clear_young(struct vm_area_struct *vma, return ret; } -#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp) { @@ -562,6 +562,9 @@ int pmdp_test_and_clear_young(struct vm_area_struct *vma, return ret; } +#endif + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE int pudp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pud_t *pudp) { diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 5e772392a379..08dd9b8c055a 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -193,7 +193,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, #endif #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) @@ -214,7 +214,7 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, BUILD_BUG(); return 0; } -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG */ #endif #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -- 2.31.1.295.g9ea45b61b8-goog
WARNING: multiple messages have this Message-ID (diff)
From: Yu Zhao <yuzhao@google.com> To: lkp@lists.01.org Subject: [PATCH v2 06/16] mm, x86: support the access bit on non-leaf PMD entries Date: Tue, 13 Apr 2021 00:56:23 -0600 [thread overview] Message-ID: <20210413065633.2782273-7-yuzhao@google.com> (raw) In-Reply-To: <20210413065633.2782273-1-yuzhao@google.com> [-- Attachment #1: Type: text/plain, Size: 4286 bytes --] Some architectures support the accessed bit on non-leaf PMD entries (parents) in addition to leaf PTE entries (children) where pages are mapped, e.g., x86_64 sets the accessed bit on a parent when using it as part of linear-address translation [1]. Page table walkers who are interested in the accessed bit on children can take advantage of this: they do not need to search the children when the accessed bit is not set on a parent, given that they have previously cleared the accessed bit on this parent. [1]: Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3 (October 2019), section 4.8 Signed-off-by: Yu Zhao <yuzhao@google.com> --- arch/Kconfig | 9 +++++++++ arch/x86/Kconfig | 1 + arch/x86/include/asm/pgtable.h | 2 +- arch/x86/mm/pgtable.c | 5 ++++- include/linux/pgtable.h | 4 ++-- 5 files changed, 17 insertions(+), 4 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index ecfd3520b676..cbd7f66734ee 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -782,6 +782,15 @@ config HAVE_ARCH_TRANSPARENT_HUGEPAGE config HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD bool +config HAVE_ARCH_PARENT_PMD_YOUNG + bool + depends on PGTABLE_LEVELS > 2 + help + Architectures that select this are able to set the accessed bit on + non-leaf PMD entries in addition to leaf PTE entries where pages are + mapped. For them, page table walkers that clear the accessed bit may + stop at non-leaf PMD entries when they do not see the accessed bit. + config HAVE_ARCH_HUGE_VMAP bool diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 2792879d398e..b5972eb82337 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -163,6 +163,7 @@ config X86 select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64 + select HAVE_ARCH_PARENT_PMD_YOUNG if X86_64 select HAVE_ARCH_USERFAULTFD_WP if X86_64 && USERFAULTFD select HAVE_ARCH_VMAP_STACK if X86_64 select HAVE_ARCH_WITHIN_STACK_FRAMES diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index a02c67291cfc..a6b5cfe1fc5a 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -846,7 +846,7 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) static inline int pmd_bad(pmd_t pmd) { - return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE; + return ((pmd_flags(pmd) | _PAGE_ACCESSED) & ~_PAGE_USER) != _KERNPG_TABLE; } static inline unsigned long pages_to_mb(unsigned long npg) diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c index f6a9e2e36642..1c27e6f43f80 100644 --- a/arch/x86/mm/pgtable.c +++ b/arch/x86/mm/pgtable.c @@ -550,7 +550,7 @@ int ptep_test_and_clear_young(struct vm_area_struct *vma, return ret; } -#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pmd_t *pmdp) { @@ -562,6 +562,9 @@ int pmdp_test_and_clear_young(struct vm_area_struct *vma, return ret; } +#endif + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE int pudp_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pud_t *pudp) { diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 5e772392a379..08dd9b8c055a 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -193,7 +193,7 @@ static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, #endif #ifndef __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG -#ifdef CONFIG_TRANSPARENT_HUGEPAGE +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG) static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, unsigned long address, pmd_t *pmdp) @@ -214,7 +214,7 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma, BUILD_BUG(); return 0; } -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HAVE_ARCH_PARENT_PMD_YOUNG */ #endif #ifndef __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH -- 2.31.1.295.g9ea45b61b8-goog
next prev parent reply other threads:[~2021-04-13 6:57 UTC|newest] Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-13 6:56 [PATCH v2 00/16] Multigenerational LRU Framework Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 01/16] include/linux/memcontrol.h: do not warn in page_memcg_rcu() if !CONFIG_MEMCG Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 02/16] include/linux/nodemask.h: define next_memory_node() if !CONFIG_NUMA Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 03/16] include/linux/huge_mm.h: define is_huge_zero_pmd() if !CONFIG_TRANSPARENT_HUGEPAGE Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 04/16] include/linux/cgroup.h: export cgroup_mutex Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 05/16] mm/swap.c: export activate_page() Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao [this message] 2021-04-13 6:56 ` [PATCH v2 06/16] mm, x86: support the access bit on non-leaf PMD entries Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 07/16] mm/vmscan.c: refactor shrink_node() Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 08/16] mm: multigenerational lru: groundwork Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 09/16] mm: multigenerational lru: activation Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 10/16] mm: multigenerational lru: mm_struct list Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-14 14:36 ` Matthew Wilcox 2021-04-14 14:36 ` Matthew Wilcox 2021-04-13 6:56 ` [PATCH v2 11/16] mm: multigenerational lru: aging Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 12/16] mm: multigenerational lru: eviction Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 13/16] mm: multigenerational lru: page reclaim Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` [PATCH v2 14/16] mm: multigenerational lru: user interface Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 22:39 ` kernel test robot 2021-04-13 22:39 ` kernel test robot 2021-04-13 6:56 ` [PATCH v2 15/16] mm: multigenerational lru: Kconfig Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 16:19 ` kernel test robot 2021-04-13 16:19 ` kernel test robot 2021-04-14 4:54 ` kernel test robot 2021-04-14 4:54 ` kernel test robot 2021-04-13 6:56 ` [PATCH v2 16/16] mm: multigenerational lru: documentation Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 6:56 ` Yu Zhao 2021-04-13 7:51 ` [PATCH v2 00/16] Multigenerational LRU Framework SeongJae Park 2021-04-13 7:51 ` SeongJae Park 2021-04-13 16:13 ` Jens Axboe 2021-04-13 16:13 ` Jens Axboe 2021-04-13 16:42 ` SeongJae Park 2021-04-13 16:42 ` SeongJae Park 2021-04-13 23:14 ` Dave Chinner 2021-04-13 23:14 ` Dave Chinner 2021-04-14 2:29 ` Rik van Riel 2021-04-14 2:29 ` Rik van Riel 2021-04-14 2:29 ` Rik van Riel 2021-04-14 4:13 ` Yu Zhao 2021-04-14 4:13 ` Yu Zhao 2021-04-14 6:15 ` Huang, Ying 2021-04-14 6:15 ` Huang, Ying 2021-04-14 6:15 ` Huang, Ying 2021-04-14 7:58 ` Yu Zhao 2021-04-14 7:58 ` Yu Zhao 2021-04-14 7:58 ` Yu Zhao 2021-04-14 8:27 ` Huang, Ying 2021-04-14 8:27 ` Huang, Ying 2021-04-14 8:27 ` Huang, Ying 2021-04-14 13:51 ` Rik van Riel 2021-04-14 13:51 ` Rik van Riel 2021-04-14 13:51 ` Rik van Riel 2021-04-14 15:56 ` Andi Kleen 2021-04-14 15:56 ` Andi Kleen 2021-04-14 15:58 ` [page-reclaim] " Shakeel Butt 2021-04-14 15:58 ` Shakeel Butt 2021-04-14 15:58 ` Shakeel Butt 2021-04-14 18:45 ` Yu Zhao 2021-04-14 18:45 ` Yu Zhao 2021-04-14 18:45 ` Yu Zhao 2021-04-14 15:51 ` Andi Kleen 2021-04-14 15:51 ` Andi Kleen 2021-04-14 15:58 ` Rik van Riel 2021-04-14 15:58 ` Rik van Riel 2021-04-14 15:58 ` Rik van Riel 2021-04-14 19:14 ` Yu Zhao 2021-04-14 19:14 ` Yu Zhao 2021-04-14 19:14 ` Yu Zhao 2021-04-14 19:41 ` Rik van Riel 2021-04-14 19:41 ` Rik van Riel 2021-04-14 19:41 ` Rik van Riel 2021-04-14 20:08 ` Yu Zhao 2021-04-14 20:08 ` Yu Zhao 2021-04-14 20:08 ` Yu Zhao 2021-04-14 19:04 ` Yu Zhao 2021-04-14 19:04 ` Yu Zhao 2021-04-14 19:04 ` Yu Zhao 2021-04-15 3:00 ` Andi Kleen 2021-04-15 3:00 ` Andi Kleen 2021-04-15 7:13 ` Yu Zhao 2021-04-15 7:13 ` Yu Zhao 2021-04-15 7:13 ` Yu Zhao 2021-04-15 8:19 ` Huang, Ying 2021-04-15 8:19 ` Huang, Ying 2021-04-15 8:19 ` Huang, Ying 2021-04-15 9:57 ` Michel Lespinasse 2021-04-18 6:48 ` Michel Lespinasse 2021-04-24 2:33 ` Yu Zhao 2021-04-24 2:33 ` Yu Zhao 2021-04-24 2:33 ` Yu Zhao 2021-04-24 3:30 ` Andi Kleen 2021-04-24 3:30 ` Andi Kleen 2021-04-24 4:16 ` Yu Zhao 2021-04-24 4:16 ` Yu Zhao 2021-04-24 4:16 ` Yu Zhao 2021-04-14 3:40 ` Yu Zhao 2021-04-14 3:40 ` Yu Zhao 2021-04-14 3:40 ` Yu Zhao 2021-04-14 4:50 ` Dave Chinner 2021-04-14 4:50 ` Dave Chinner 2021-04-14 7:16 ` Yu Zhao 2021-04-14 7:16 ` Yu Zhao 2021-04-14 7:16 ` Yu Zhao 2021-04-14 10:00 ` Yu Zhao 2021-04-14 10:00 ` Yu Zhao 2021-04-15 1:36 ` Dave Chinner 2021-04-15 1:36 ` Dave Chinner 2021-04-24 21:21 ` Yu Zhao 2021-04-24 21:21 ` Yu Zhao 2021-04-24 21:21 ` Yu Zhao 2021-04-14 14:43 ` Jens Axboe 2021-04-14 14:43 ` Jens Axboe 2021-04-14 19:42 ` Yu Zhao 2021-04-14 19:42 ` Yu Zhao 2021-04-14 19:42 ` Yu Zhao 2021-04-15 1:21 ` Dave Chinner 2021-04-15 1:21 ` Dave Chinner 2021-04-14 17:43 ` Johannes Weiner 2021-04-14 17:43 ` Johannes Weiner 2021-04-27 10:35 ` Yu Zhao 2021-04-27 10:35 ` Yu Zhao 2021-04-27 10:35 ` Yu Zhao 2021-04-29 23:46 ` Konstantin Kharlamov 2021-04-29 23:46 ` Konstantin Kharlamov 2021-04-29 23:46 ` Konstantin Kharlamov 2021-04-30 6:37 ` Konstantin Kharlamov 2021-04-30 6:37 ` Konstantin Kharlamov 2021-04-30 6:37 ` Konstantin Kharlamov 2021-04-30 19:31 ` Yu Zhao 2021-04-30 19:31 ` Yu Zhao 2021-04-30 19:31 ` Yu Zhao
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