Re: [PATCH mm-unstable v1] mm/page_alloc: try not to overestimate free highatomic

[Matt Fleming]

On Wed, Oct 23, 2024 at 8:35 AM Vlastimil Babka <vbabka@xxxxxxx> wrote:
>
> I thought the alloc demand is only blocked on the pessimistic watermark
> calculation. Usable free pages exist, but the allocation is not allowed to
> use them.

I'm confused -- I thought the problem was the inverse of your
statement: the allocation is attempted because
__zone_watermark_unusable_free() claims the highatomic pages are free
but they're not?