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

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Message-ID: <CAGis_TUHyH8mM4q+pWJH+LfYchQkjL6Pap4sNfLA=HRqg50KAQ@mail.gmail.com>
Date: Wed, 23 Oct 2024 10:25:43 +0100
From: Matt Fleming <mfleming@...udflare.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: Yu Zhao <yuzhao@...gle.com>, Michal Hocko <mhocko@...e.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org, Link Lin <linkl@...gle.com>, 
	Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH mm-unstable v1] mm/page_alloc: try not to overestimate
 free highatomic

On Wed, Oct 23, 2024 at 8:35 AM Vlastimil Babka <vbabka@...e.cz> 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?