From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 09E1041A56E for ; Wed, 15 Jul 2026 18:38:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784140724; cv=none; b=NbMHvj0s3Lm/Jjmx9lZGLXrvPeVLeBAqDd6p0QkCbwVx1oAWNHBEl5RPo8+d/kvW1mOxok+0ksXhk/7Bbkv6vM3UJ7pPie+j8qLEZ7VcenVhsPOAlOS8fDkrGjq1/7EZDa/ZXtVuvJ4jwB347PqfxVVw8Rc+Nd8muqz3nplT/YI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784140724; c=relaxed/simple; bh=5caumuIlWlDZeWPcyOdT3RnpIuTIxmnF9p1ehrC0tYo=; h=Date:To:From:Subject:Message-Id; b=XMwZ3PmJcT3M1rXCsQLk64lzcPRvXJzy/0Mu5h4s9VaO9K2KXTMUY6lgrEWvwPLr8YzJ30cOaPNrRSuEfDHoclJ5ArihzjPWQaa6uNc0TYW4msavgBB8OJc++4D8vEdRQLhv5/Ps4RIGyTBP/MFZ01YYoLOtzVBuvfUKqsS7ds4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=G+oAjvVQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="G+oAjvVQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A8AAA1F00ACA; Wed, 15 Jul 2026 18:38:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1784140705; bh=vps8h0whAxuc8VPgrTQgsbY/79YxWy5Ji5evf2dINL0=; h=Date:To:From:Subject; b=G+oAjvVQLkDhJZVtO8X0hMhHpRdfWwR7v+CK/vK94OrLoUTqrVAO2J3ki5jyLtaUo t/Y65vZfg5OrIrDSVz3KQJZRKJ0YeGCIFv+6hLP14HhproQlQ/MC5YfhIGgNH28tMj z1+kCsUxEdehbGM8iLRb596mcyg7CRV3KNgzyKeo= Date: Wed, 15 Jul 2026 11:38:25 -0700 To: mm-commits@vger.kernel.org,baohua@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch added to mm-unstable branch Message-Id: <20260715183825.A8AAA1F00ACA@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/vmalloc: align vm_area so vmap() can batch mappings has been added to the -mm mm-unstable branch. Its filename is mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: "Barry Song (Xiaomi)" Subject: mm/vmalloc: align vm_area so vmap() can batch mappings Date: Wed, 15 Jul 2026 20:08:13 +0800 Try to align the vmap virtual address to PMD_SHIFT or a larger PTE mapping size hinted by the architecture, so contiguous pages can be batch-mapped when setting PMD or PTE entries. We do not expect any significant overhead for this. Add __get_vm_area_node_aligned_caller() as a wrapper over __get_vm_area_node() to simplify repeated calls with fixed arguments. Link: https://lore.kernel.org/20260715120813.3609949-8-jiangwen6@xiaomi.com Signed-off-by: Barry Song (Xiaomi) Signed-off-by: Wen Jiang Tested-by: Xueyuan Chen Tested-by: Leo Yan Reviewed-by: Uladzislau Rezki (Sony) Reviewed-by: Dev Jain Cc: Andrew Donnellan Cc: Anshuman Khandual Cc: Catalin Marinas Cc: David Hildenbrand Cc: Mike Rapoport Cc: Ryan Roberts Cc: Wen Jiang Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/vmalloc.c | 35 ++++++++++++++++++++++++++++++++++- 1 file changed, 34 insertions(+), 1 deletion(-) --- a/mm/vmalloc.c~mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings +++ a/mm/vmalloc.c @@ -3338,6 +3338,14 @@ struct vm_struct *get_vm_area_caller(uns NUMA_NO_NODE, GFP_KERNEL, caller); } +static struct vm_struct *__get_vm_area_node_aligned_caller(unsigned long size, + unsigned long align, unsigned long flags, const void *caller) +{ + return __get_vm_area_node(size, align, PAGE_SHIFT, flags, + VMALLOC_START, VMALLOC_END, + NUMA_NO_NODE, GFP_KERNEL, caller); +} + /** * find_vm_area - find a continuous kernel virtual area * @addr: base address @@ -3664,6 +3672,30 @@ out: return err; } +static struct vm_struct *vmap_get_aligned_vm_area(unsigned long size, + unsigned long flags, pgprot_t prot, const void *caller) +{ + struct vm_struct *vm_area; + unsigned int shift; + + if (arch_vmap_pmd_supported(prot) && size >= PMD_SIZE) { + vm_area = __get_vm_area_node_aligned_caller(size, PMD_SIZE, + flags, caller); + if (vm_area) + return vm_area; + } + + shift = arch_vmap_pte_supported_shift(size); + if (shift > PAGE_SHIFT) { + vm_area = __get_vm_area_node_aligned_caller(size, 1UL << shift, + flags, caller); + if (vm_area) + return vm_area; + } + + return __get_vm_area_node_aligned_caller(size, PAGE_SIZE, flags, caller); +} + /** * vmap - map an array of pages into virtually contiguous space * @pages: array of page pointers @@ -3702,7 +3734,8 @@ void *vmap(struct page **pages, unsigned return NULL; size = (unsigned long)count << PAGE_SHIFT; - area = get_vm_area_caller(size, flags, __builtin_return_address(0)); + area = vmap_get_aligned_vm_area(size, flags, prot, + __builtin_return_address(0)); if (!area) return NULL; _ Patches currently in -mm which might be from baohua@kernel.org are mm-avoid-unnecessary-lru-drain-for-wp_can_reuse_anon_folio.patch mm-avoid-unnecessary-lru-drain-for-wp_can_reuse_anon_folio-fix.patch mm-drop-stale-folio_ref_count==1-check-in-do_swap_page-reuse-logic.patch mm-entirely-remove-lru_add_drain-in-do_swap_page.patch mm-clarify-the-folio_free_swap-for-do_swap_page.patch arm64-hugetlb-extend-batching-of-multiple-cont_pte-in-a-single-pte-setup.patch arm64-vmalloc-allow-arch_vmap_pte_range_map_size-to-batch-multiple-cont_pte.patch mm-vmalloc-extend-page-table-walk-to-support-larger-page_shift-sizes-and-eliminate-page-table-rewalk.patch mm-vmalloc-map-contiguous-pages-in-batches-for-vmap-if-possible.patch mm-vmalloc-align-vm_area-so-vmap-can-batch-mappings.patch