From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794023389; b=H1QsN/Y+KgKERBmsVvIQKnI6esiaoCZ6eKOrizOisBWIKqSnIwX274JWmTdm4/CqLp7N mYogaOdz9mFdSZeIkG2JlsQC2Pk91KepvpJXnrT9XP4Z58xwkTBOC6wthwJF/yyjWHy6C 5efay20lHGry4lCOiQMODmlPV52JPSJcH3/doJaTi/FQTMwK5YLZgWdgVVgUPB8F7RxS/ qM6FHWQxuZcaQF22CupQRgvK/jedhz2Ay30A35eeplm0FDy0IJPuEqX5nuNOFCYJtqT2Q zYuo/cE7M9gTYResrp33t2d4GZIWvo39E6IsVvY/lC6AwP3DemJUhLqeNoDlNWBgrxg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794023389; h=Received:DKIM-Signature:Date:To:From:Subject:Message-Id; bh=7U0aWRTb/vx8vZMalXtg9v6C3ZUXt250K+PMd+6pshI=; b=uUCyZt/UWMjjZ1DimFBeJ2xuKYufS1R0uYTgIxBvcHCad2kNZeF5VqHCh5UIkZLW3IZg CFQKfdFnD6bvuJODHnpTFKPwcrLffC/Y/vqVRMMB9ceAMSEwBB7iWdtbE2ijSDZg1sATt 0DdLkCh+0A420wFd4fLAYT8y2c8MrN1oFv10vpvh29vmmWCXIiigoT2ukN/HE5atrR0cr I52w9sdXKeeFv5YZRURiQwz54W4c8cW550e2fF+9FK4QpYQFkobAhLKnMVAsFZ8ufs0aZ F9nIZ8tBvipeM4DrOUaZB6RzifIFR7oBh1tYn2ThvT1Jz5wCFtdIv75u84GlNB5t1hA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=JqBZ5bmC; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 991FB606A32C for ; Sat, 7 Nov 2026 03:49:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=JqBZ5bmC Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3054E1F0089F; Sat, 7 Nov 2026 03:49:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1794023389; bh=7U0aWRTb/vx8vZMalXtg9v6C3ZUXt250K+PMd+6pshI=; h=Date:To:From:Subject; b=JqBZ5bmCfaebz6e7df0AsJT9y9MUkih1+sZ2IHuAU8x9AhB/bcwHxTE3AQwLgaB3Y GrlN3iWgFLJe7SyyRTwKt9ZQxDIrEybvY/v9SSkONutwksbu1IoxMC8h3BCcnX9InV u7+ztaN48S3/H2ngRYzIMMy5fnBzEehmFd8Q3EtA= Date: Fri, 06 Nov 2026 19:49:48 -0800 To: mm-commits@vger.kernel.org,muchun.song@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: [to-be-updated] mm-hugetlb_vmemmap-generalize-vmemmap-page-allocation.patch removed from -mm tree Message-Id: <20261107034949.3054E1F0089F@smtp.kernel.org> X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list The quilt patch titled Subject: mm: hugetlb_vmemmap: generalize vmemmap page allocation has been removed from the -mm tree. Its filename was mm-hugetlb_vmemmap-generalize-vmemmap-page-allocation.patch This patch was dropped because an updated version will be issued ------------------------------------------------------ From: Muchun Song Subject: mm: hugetlb_vmemmap: generalize vmemmap page allocation Date: Wed, 04 Nov 2026 10:35:02 +0800 Vmemmap page allocation is currently tied to restoring a virtual range and assumes an empty destination list. These constraints prevent it from being reused when pages are requested independently of a vmemmap range or appended to an existing list. Generalize the allocator and give it an all-or-nothing list contract so the restore and optimization paths can share the same allocation policy. This also allows HVO head-page allocation to fail gracefully under memory pressure without triggering the OOM killer. Link: https://lore.kernel.org/20261104023510.260766-5-songmuchun@bytedance.com Signed-off-by: Muchun Song Signed-off-by: Andrew Morton Reviewed-by: Lance Yang Reviewed-by: Qi Zheng Tested-by: Andrew Morton Link: https://lore.kernel.org/20261103224659.2865b9ff27d09994949edd78@linux-foundation.org Reviewed-by: Oscar Salvador Reviewed-by: Mike Rapoport (Microsoft) Cc: James Houghton Cc: David Hildenbrand Cc: Huacai Chen --- mm/hugetlb_vmemmap.c | 31 ++++++++++++++----------------- 1 file changed, 14 insertions(+), 17 deletions(-) --- a/mm/hugetlb_vmemmap.c~mm-hugetlb_vmemmap-generalize-vmemmap-page-allocation +++ a/mm/hugetlb_vmemmap.c @@ -334,26 +334,24 @@ static int vmemmap_remap_free(unsigned l return ret; } -static int alloc_vmemmap_page_list(unsigned long start, unsigned long end, - struct list_head *list) +static int alloc_vmemmap_page_list(struct list_head *head, + unsigned int nr_pages, int nid) { - gfp_t gfp_mask = GFP_KERNEL | __GFP_RETRY_MAYFAIL; - unsigned long nr_pages = (end - start) >> PAGE_SHIFT; - int nid = page_to_nid((struct page *)start); + LIST_HEAD(new_pages); struct page *page, *next; - int i; - for (i = 0; i < nr_pages; i++) { - page = alloc_pages_node(nid, gfp_mask, 0); + for (unsigned int i = 0; i < nr_pages; i++) { + page = alloc_pages_node(nid, GFP_KERNEL | __GFP_RETRY_MAYFAIL, 0); if (!page) - goto out; - list_add(&page->lru, list); + goto free_pages; + list_add(&page->lru, &new_pages); } + list_splice(&new_pages, head); memmap_pages_add(nr_pages); return 0; -out: - list_for_each_entry_safe(page, next, list, lru) +free_pages: + list_for_each_entry_safe(page, next, &new_pages, lru) __free_page(page); return -ENOMEM; } @@ -374,13 +372,14 @@ static int vmemmap_remap_alloc(unsigned unsigned long flags) { LIST_HEAD(vmemmap_pages); + int nid = page_to_nid((struct page *)start); struct vmemmap_remap_walk walk = { .remap_pte = vmemmap_restore_pte, .vmemmap_pages = &vmemmap_pages, .flags = flags, }; - if (alloc_vmemmap_page_list(start, end, &vmemmap_pages)) + if (alloc_vmemmap_page_list(&vmemmap_pages, (end - start) / PAGE_SIZE, nid)) return -ENOMEM; return vmemmap_remap_range(start, end, &walk); @@ -527,15 +526,13 @@ static int __hugetlb_vmemmap_optimize_fo */ folio_set_hugetlb_vmemmap_optimized(folio); - vmemmap_head = alloc_pages_node(nid, GFP_KERNEL, 0); - if (!vmemmap_head) { + if (alloc_vmemmap_page_list(vmemmap_pages, VMEMMAP_OPTIMIZATION_PAGES, nid)) { ret = -ENOMEM; goto out; } + vmemmap_head = list_first_entry(vmemmap_pages, struct page, lru); copy_page(page_to_virt(vmemmap_head), folio); - list_add(&vmemmap_head->lru, vmemmap_pages); - memmap_pages_add(1); vmemmap_start = (unsigned long)&folio->page; vmemmap_end = vmemmap_start + hugetlb_vmemmap_size(h); _ Patches currently in -mm which might be from muchun.song@linux.dev are mm-fix-missing-page-table-destructor-in-pagetable_free.patch riscv-mm-fix-hotplug-page-table-destructor-handling.patch riscv-mm-fix-missing-destructor-for-hotplug-pud-tables.patch arm64-mm-fix-destructor-for-unconstructed-hotplug-page-tables.patch mm-sparse-vmemmap-map-shared-vmemmap-tail-pages-as-read-only.patch powerpc-mm-map-shared-vmemmap-tail-pages-as-read-only.patch mm-hugetlb_vmemmap-remove-vmemmap_wrprotect_hvo.patch mm-hugetlb_vmemmap-remove-hugetlb_vmemmap_optimize_bootmem_folios.patch mm-generalize-kernel-pte-table-allocation.patch mm-generalize-pmd-page-table-allocation.patch mm-generalize-pud-page-table-allocation.patch mm-remove-pagetable_dtor_free.patch mm-remove-redundant-pagetable_dtor-calls.patch mm-hugetlb_vmemmap-unify-writable-vmemmap-page-preparation.patch mm-hugetlb_vmemmap-rename-vmemmap_remap_pte-to-vmemmap_optimize_pte.patch mm-hugetlb_vmemmap-simplify-shared-tail-page-handling.patch mm-hugetlb_vmemmap-move-alloc_vmemmap_page_list-next-to-its-free-helper.patch mm-hugetlb_vmemmap-make-vmemmap-optimization-folio-oriented.patch mm-hugetlb_vmemmap-make-vmemmap-restoration-folio-oriented.patch mm-hugetlb_vmemmap-unify-vmemmap-range-restoration.patch mm-hugetlb_vmemmap-make-vmemmap-pte-conversion-folio-oriented.patch mm-hugetlb-fix-validation-of-unsupported-hugetlb-orders.patch