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 7AE633C3F45 for ; Fri, 28 Aug 2026 05:40:43 +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=1787895647; cv=none; b=NO2GBBUat5rNiUbU8Oup2fevYg6eNa6VSAxbu0noSYzKiHr5CRFWmdOQkrIOWKQlCG5FXbEd3lfkhVOdmqiawYPE/UL3FtkplAVHQFL5fbQTFtxb2xLafv9ngtzevXnyocjGg5OvgsJ4UmVlu1Nkjjk4E7O3hWKMnuVUeQxDHCk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787895647; c=relaxed/simple; bh=Qz5YmPElnOhOMKtG5cW1yQWlKYRFW9apnZrWIaU3vEA=; h=Date:To:From:Subject:Message-Id; b=BpHm3xz0CxbywkuckHBLSUxyO9oR9xmUfkDJxQa99W0jHoylnClCNj0wOL81RuBwJ/TZSICsK1Q2ZlVKejD+PWlJbVN/m/JFeh4+JqPnjObsvieOO0jCj8z7Oxm7kQUzYhqjorjk0X82fPE7C8yRFycfBQTK+s0cOJ7A9yTsVEE= 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=vQhK68pu; 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="vQhK68pu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C348E1F000E9; Fri, 28 Aug 2026 05:40:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1787895643; bh=5HQ7GXM+ymU74guSsCfy6ypuy0gOg0vEMf5IrWbBzr4=; h=Date:To:From:Subject; b=vQhK68pueP1p8QKB7U7MkR1SJB7+gyUcCNMIS7aTXgveK9+paWs4BrlEsC5zf7dIR Tf1Qdi3nIksywFLQyZPYFlEr5thaADSEiryAei71K+Kl42r6FT8EcxfTRMU2vB5on+ 5o/x79a0JZ0WOBm35ku91glPkXb+pn2F3DRThU18= Date: Thu, 27 Aug 2026 22:40:43 -0700 To: mm-commits@vger.kernel.org,rppt@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-vmalloc-make-set_area_direct_map-huge_vmap-friendly.patch added to mm-new branch Message-Id: <20260828054043.C348E1F000E9@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: make set_area_direct_map HUGE_VMAP friendly has been added to the -mm mm-new branch. Its filename is mm-vmalloc-make-set_area_direct_map-huge_vmap-friendly.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-make-set_area_direct_map-huge_vmap-friendly.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: "Mike Rapoport (Microsoft)" Subject: mm/vmalloc: make set_area_direct_map HUGE_VMAP friendly Date: Sun, 23 Aug 2026 14:46:15 +0300 set_area_direct_map() always updates direct map alias permissions in single page increments. For HUGE_VMAP areas it's suboptimal. Not only the loop in set_area_direct_map() needlessly has more iterations (e.g times 512 on x86), but it also causes fragmentation of the direct map that could be avoided for the HUGE_VMAP areas populated with large pages. All pages in an area are always of the same order: either same-order large pages when VM_ALLOW_HUGE_VMAP is set and all huge pages were successfully allocated, or order-0 page when VM_ALLOW_HUGE_VMAP is cleared or when huge pages allocation fails and fallback path is taken. Instead of updating the direct map permissions for every order-0 page in an area, use the area's page_order as the loop increment and update the large pages in one call to set_direct_map_{invalid,default}_noflush(). Link: https://lore.kernel.org/20260823-execmem-set-vm-perms-v0-2-v2-4-b013a37d84b3@kernel.org Signed-off-by: Mike Rapoport (Microsoft) Cc: Albert Ou Cc: Alexander Gordeev Cc: Alexandre Ghiti Cc: Andy Lutomirski Cc: "Borislav Petkov (AMD)" Cc: Brendan Jackman Cc: Catalin Marinas Cc: Christian Borntraeger Cc: Dave Hansen Cc: David Hildenbrand Cc: Gerald Schaefer Cc: Heiko Carstens Cc: "H. Peter Anvin" Cc: Huacai Chen Cc: Ingo Molnar Cc: Len Brown Cc: Palmer Dabbelt Cc: Peter Zijlstra Cc: "Rafael J. Wysocki" Cc: Ryan Roberts Cc: Sven Schnelle Cc: "Uladzislau Rezki (Sony)" Cc: Vasily Gorbik Cc: WANG Xuerui Cc: Will Deacon Signed-off-by: Andrew Morton --- mm/vmalloc.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) --- a/mm/vmalloc.c~mm-vmalloc-make-set_area_direct_map-huge_vmap-friendly +++ a/mm/vmalloc.c @@ -3366,12 +3366,15 @@ static inline void set_area_direct_map(c int (*set_direct_map)(struct page *page, unsigned int nr)) { - unsigned long i; + unsigned int nr = (1U << vm_area_page_order(area)); - /* HUGE_VMALLOC passes small pages to set_direct_map */ - for (i = 0; i < area->nr_pages; i++) - if (page_address(area->pages[i])) - set_direct_map(area->pages[i], 1); + for (unsigned long i = 0; i < area->nr_pages; i += nr) { + if (page_address(area->pages[i])) { + int err = set_direct_map(area->pages[i], nr); + + WARN_ON_ONCE(err); + } + } } /* _ Patches currently in -mm which might be from rppt@kernel.org are set_memory-add-number-of-pages-parameter-to-set_direct_map-apis.patch mm-vmalloc-set-areas-page_order-after-allocation-succeeds.patch mm-vmalloc-constify-vm-parameter-of-get_vm_area_page_order.patch mm-vmalloc-make-set_area_direct_map-huge_vmap-friendly.patch mm-execmem-use-vm_flush_reset_perms-for-rox-cache-allocations.patch revert-arch-introduce-set_direct_map_valid_noflush.patch sh-remove-config_numa-and-realted-configuration-options.patch sh-mm-remove-numac.patch sh-mm-drop-allocate_pgdat.patch sh-remove-setup_bootmem_node-and-plat_mem_setup.patch sh-drop-dead-code-guarded-by-ifdef-config_numa.patch sh-drop-include-asm-mmzoneh.patch init-kconfig-drop-arch_want_numa_variable_locality.patch sh-init-remove-call-the-memblock_set_node.patch sh-remove-sparsemem-related-entries-from-kconfig.patch sh-drop-include-asm-sparsememh.patch