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 2484F377009 for ; Thu, 9 Jul 2026 23:05:29 +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=1783638331; cv=none; b=UeMkSkVS6kZshLWziwNzrMETYY4OzwxYRoGBxM9qPmywvd61kcnwg8RFM0qR0ICR6geyE7cfdJ3gcJFyL9qgl/wzosVV+4I3mmD/tN0Yp3MY3qC0sFQWCECdiJj1IqVnDK7R+pXVOUfPtM0LBpzTVFtfr5HL6AQE1SxaRP3bQwg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783638331; c=relaxed/simple; bh=7IfXAZcToCy/+wzL0TLP/IUE9nNwQxWlZXVfKrALdSY=; h=Date:To:From:Subject:Message-Id; b=gR5Lkul9R8dn+v+qXVUVyKbn4vJSnmSwLKeYNfjYOiyC0iEj8RkKMVZi9ugTHg1q8mWGHi3dnOuolq6VLr5doq4qlb+fsOmf+QlGxn3eURYgShspyE27COPsG6tMaAtycKCMyuWHiSc1gv4+LYps0Pc2wbtU7oeqhHNPnloA5HY= 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=WrfCrEmn; 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="WrfCrEmn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2C451F000E9; Thu, 9 Jul 2026 23:05:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1783638329; bh=4fYX9GjRsUnZCrWa/0c7D1887fQhUD+zEN1Eu0TFnTY=; h=Date:To:From:Subject; b=WrfCrEmnK7DlT4L4zLB3fNEEsJwaNbtBkEpvwws+4mQze39PMXiGnYtYowiBwWJBN xfHlUXmOon6auqExXZ7hlLVy4leABzS5q+7V8k8zXtMSPvvpln/EqN3tLgPLrsgzXP 1jVQbmBJlgGV1ya+r6Rhhk5WR3X0iPWm0Q7/s4m4= Date: Thu, 09 Jul 2026 16:05:29 -0700 To: mm-commits@vger.kernel.org,xueyuan.chen21@gmail.com,will@kernel.org,urezki@gmail.com,ryan.roberts@arm.com,rppt@kernel.org,leo.yan@arm.com,jiangwenxiaomi@gmail.com,jiangwen6@xiaomi.com,dev.jain@arm.com,david@kernel.org,catalin.marinas@arm.com,anshuman.khandual@arm.com,ajd@linux.ibm.com,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-new branch Message-Id: <20260709230529.C2C451F000E9@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-new 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-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next 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: Thu, 9 Jul 2026 15:38:23 +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/20260709073823.6643-7-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) Cc: Andrew Donnellan Cc: Anshuman Khandual Cc: Catalin Marinas Cc: David Hildenbrand Cc: Dev Jain 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 @@ -3309,6 +3309,14 @@ 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 @@ -3632,6 +3640,30 @@ 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 @@ -3670,7 +3702,8 @@ 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