Re: [RFC PATCH 1/1] arm64: mm: remove unnecessary multiple tlb flush of contiguous hugetlb

[Catalin Marinas]

On Tue, Feb 07, 2023 at 07:09:41PM +0800, Kaihao Bai wrote:
> In arm64, contiguous flag refers to the same TLB entry that shared by a
> contiguous address range. If flush one entry of the address range, it
> would cover the whole contiguous address range. Thus there's no need to
> flush all contiguous range that CONT_PMD/PTE points to.

This doesn't work. The contiguous bit is a hint, so the CPU may not
coalesce multiple PTEs into a single TLB entry.

-- 
Catalin