From: Ryan Roberts <ryan.roberts@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, "Matthew Wilcox (Oracle)" <willy@infradead.org>, Yu Zhao <yuzhao@google.com>, "Yin, Fengwei" <fengwei.yin@intel.com> Cc: Ryan Roberts <ryan.roberts@arm.com>, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org Subject: [RFC v2 PATCH 16/17] mm: mmap: Align unhinted maps to highest anon folio order Date: Fri, 14 Apr 2023 14:03:02 +0100 [thread overview] Message-ID: <20230414130303.2345383-17-ryan.roberts@arm.com> (raw) In-Reply-To: <20230414130303.2345383-1-ryan.roberts@arm.com> When allocating large anonymous folios, we want to maximize our chances of being able to use the highest order we support. Since one of the constraints is that a folio has to be mapped naturally aligned, let's have mmap default to that alignment when user space does not provide a hint. With this in place, an extra 2% of all allocated anonymous memory belongs to a folio of the highest order, when compiling the kernel. Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> --- mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index ff68a67a2a7c..e7652001a32e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1627,7 +1627,7 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, info.length = len; info.low_limit = mm->mmap_base; info.high_limit = mmap_end; - info.align_mask = 0; + info.align_mask = BIT(PAGE_SHIFT + ANON_FOLIO_ORDER_MAX) - 1; info.align_offset = 0; return vm_unmapped_area(&info); } @@ -1677,7 +1677,7 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, info.length = len; info.low_limit = max(PAGE_SIZE, mmap_min_addr); info.high_limit = arch_get_mmap_base(addr, mm->mmap_base); - info.align_mask = 0; + info.align_mask = BIT(PAGE_SHIFT + ANON_FOLIO_ORDER_MAX) - 1; info.align_offset = 0; addr = vm_unmapped_area(&info); -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Ryan Roberts <ryan.roberts@arm.com> To: Andrew Morton <akpm@linux-foundation.org>, "Matthew Wilcox (Oracle)" <willy@infradead.org>, Yu Zhao <yuzhao@google.com>, "Yin, Fengwei" <fengwei.yin@intel.com> Cc: Ryan Roberts <ryan.roberts@arm.com>, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org Subject: [RFC v2 PATCH 16/17] mm: mmap: Align unhinted maps to highest anon folio order Date: Fri, 14 Apr 2023 14:03:02 +0100 [thread overview] Message-ID: <20230414130303.2345383-17-ryan.roberts@arm.com> (raw) In-Reply-To: <20230414130303.2345383-1-ryan.roberts@arm.com> When allocating large anonymous folios, we want to maximize our chances of being able to use the highest order we support. Since one of the constraints is that a folio has to be mapped naturally aligned, let's have mmap default to that alignment when user space does not provide a hint. With this in place, an extra 2% of all allocated anonymous memory belongs to a folio of the highest order, when compiling the kernel. Signed-off-by: Ryan Roberts <ryan.roberts@arm.com> --- mm/mmap.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index ff68a67a2a7c..e7652001a32e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1627,7 +1627,7 @@ generic_get_unmapped_area(struct file *filp, unsigned long addr, info.length = len; info.low_limit = mm->mmap_base; info.high_limit = mmap_end; - info.align_mask = 0; + info.align_mask = BIT(PAGE_SHIFT + ANON_FOLIO_ORDER_MAX) - 1; info.align_offset = 0; return vm_unmapped_area(&info); } @@ -1677,7 +1677,7 @@ generic_get_unmapped_area_topdown(struct file *filp, unsigned long addr, info.length = len; info.low_limit = max(PAGE_SIZE, mmap_min_addr); info.high_limit = arch_get_mmap_base(addr, mm->mmap_base); - info.align_mask = 0; + info.align_mask = BIT(PAGE_SHIFT + ANON_FOLIO_ORDER_MAX) - 1; info.align_offset = 0; addr = vm_unmapped_area(&info); -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2023-04-14 13:04 UTC|newest] Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-04-14 13:02 [RFC v2 PATCH 00/17] variable-order, large folios for anonymous memory Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 01/17] mm: Expose clear_huge_page() unconditionally Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 02/17] mm: pass gfp flags and order to vma_alloc_zeroed_movable_folio() Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 03/17] mm: Introduce try_vma_alloc_movable_folio() Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-17 8:49 ` Yin, Fengwei 2023-04-17 8:49 ` Yin, Fengwei 2023-04-17 10:11 ` Ryan Roberts 2023-04-17 10:11 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 04/17] mm: Implement folio_add_new_anon_rmap_range() Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 05/17] mm: Routines to determine max anon folio allocation order Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 14:09 ` Kirill A. Shutemov 2023-04-14 14:09 ` Kirill A. Shutemov 2023-04-14 14:38 ` Ryan Roberts 2023-04-14 14:38 ` Ryan Roberts 2023-04-14 15:37 ` Kirill A. Shutemov 2023-04-14 15:37 ` Kirill A. Shutemov 2023-04-14 16:06 ` Ryan Roberts 2023-04-14 16:06 ` Ryan Roberts 2023-04-14 16:18 ` Matthew Wilcox 2023-04-14 16:18 ` Matthew Wilcox 2023-04-14 16:31 ` Ryan Roberts 2023-04-14 16:31 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 06/17] mm: Allocate large folios for anonymous memory Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 07/17] mm: Allow deferred splitting of arbitrary large anon folios Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 08/17] mm: Implement folio_move_anon_rmap_range() Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 09/17] mm: Update wp_page_reuse() to operate on range of pages Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 10/17] mm: Reuse large folios for anonymous memory Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 11/17] mm: Split __wp_page_copy_user() into 2 variants Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 12/17] mm: ptep_clear_flush_range_notify() macro for batch operation Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:02 ` [RFC v2 PATCH 13/17] mm: Implement folio_remove_rmap_range() Ryan Roberts 2023-04-14 13:02 ` Ryan Roberts 2023-04-14 13:03 ` [RFC v2 PATCH 14/17] mm: Copy large folios for anonymous memory Ryan Roberts 2023-04-14 13:03 ` Ryan Roberts 2023-04-14 13:03 ` [RFC v2 PATCH 15/17] mm: Convert zero page to large folios on write Ryan Roberts 2023-04-14 13:03 ` Ryan Roberts 2023-04-14 13:03 ` Ryan Roberts [this message] 2023-04-14 13:03 ` [RFC v2 PATCH 16/17] mm: mmap: Align unhinted maps to highest anon folio order Ryan Roberts 2023-04-17 8:25 ` Yin, Fengwei 2023-04-17 8:25 ` Yin, Fengwei 2023-04-17 10:13 ` Ryan Roberts 2023-04-17 10:13 ` Ryan Roberts 2023-04-14 13:03 ` [RFC v2 PATCH 17/17] mm: Batch-zap large anonymous folio PTE mappings Ryan Roberts 2023-04-14 13:03 ` Ryan Roberts 2023-04-17 8:04 ` [RFC v2 PATCH 00/17] variable-order, large folios for anonymous memory Yin, Fengwei 2023-04-17 8:04 ` Yin, Fengwei 2023-04-17 10:19 ` Ryan Roberts 2023-04-17 10:19 ` Ryan Roberts 2023-04-17 8:19 ` Yin, Fengwei 2023-04-17 8:19 ` Yin, Fengwei 2023-04-17 10:28 ` Ryan Roberts 2023-04-17 10:28 ` Ryan Roberts 2023-04-17 10:54 ` David Hildenbrand 2023-04-17 10:54 ` David Hildenbrand 2023-04-17 11:43 ` Ryan Roberts 2023-04-17 11:43 ` Ryan Roberts 2023-04-17 14:05 ` David Hildenbrand 2023-04-17 14:05 ` David Hildenbrand 2023-04-17 15:38 ` Ryan Roberts 2023-04-17 15:38 ` Ryan Roberts 2023-04-17 15:44 ` David Hildenbrand 2023-04-17 15:44 ` David Hildenbrand 2023-04-17 16:15 ` Ryan Roberts 2023-04-17 16:15 ` Ryan Roberts 2023-04-26 10:41 ` Ryan Roberts 2023-04-26 10:41 ` Ryan Roberts 2023-05-17 13:58 ` David Hildenbrand 2023-05-17 13:58 ` David Hildenbrand 2023-05-18 11:23 ` Ryan Roberts 2023-05-18 11:23 ` Ryan Roberts 2023-04-19 10:12 ` Ryan Roberts 2023-04-19 10:12 ` Ryan Roberts 2023-04-19 10:51 ` David Hildenbrand 2023-04-19 10:51 ` David Hildenbrand 2023-04-19 11:13 ` Ryan Roberts 2023-04-19 11:13 ` Ryan Roberts
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