Re: [PATCH] arm64: mm: enable per pmd page table lock

From: Anshuman Khandual
Date: Mon Feb 18 2019 - 22:08:58 EST

On 02/15/2019 02:46 AM, Yu Zhao wrote:
> Switch from per mm_struct to per pmd page table lock by enabling
> ARCH_ENABLE_SPLIT_PMD_PTLOCK. This provides better granularity for
> large system.
> I'm not sure if there is contention on mm->page_table_lock. Given
> the option comes at no cost (apart from initializing more spin
> locks), why not enable it now.

This has similar changes to what I had posted part of the general page table
page accounting clean up series on arm64 last month.