Re: [PATCH v5 10/12] mm/sparse-vmemmap: drop the extra tail page from device DAX reservation
flat view
From: "David Hildenbrand (Arm)" <david@kernel.org>
Date: 2026-09-29 07:45:10
Also in:
linux-doc, linux-mm, lkml
On 9/27/26 04:54, Muchun Song wrote:
The device DAX vmemmap population still reserves one extra tail vmemmap page after the head page. Drop that extra reservation and let the shared tail page cover all tail vmemmap pages after the head page, so DAX follows the same reservation model as HugeTLB. This reduces the reserved vmemmap pages for optimized DAX mappings to one and removes the now-unneeded first-tail population from the generic and powerpc paths to simplify the code as well. Signed-off-by: Muchun Song <redacted> Acked-by: Qi Zheng <qi.zheng@linux.dev> ---
Acked-by: David Hildenbrand (Arm) <david@kernel.org> -- Cheers, David