Re: [PATCH v2] mm/huge_memory: prevent THP_ZERO_PAGE_ALLOC increased twice

[Kirill A. Shutemov]

On Thu, Sep 08, 2022 at 11:55:33AM +0800, Liu Shixin wrote:
> If two or more threads call get_huge_zero_page concurrently,
> THP_ZERO_PAGE_ALLOC may increased two or more times. But actually,
> this should only count as once since the extra zero pages has been
> freed. Redefine its meaning to indicate the times a huge zero page
> used for thp is successfully allocated.

I don't particularly care, but it is not obvoius why the new behaviour is
better.

All huge zero pages are freed apart from possibly the last one allocated.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov