linux-kernel - Re: [PATCH] mm/hugetlb: align cma on allocation order, not demotion order

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Message-ID: <ZjPDLZZ-raoO2mRy@P9FQF9L96D>
Date: Thu, 2 May 2024 09:45:33 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Frank van der Linden <fvdl@...gle.com>
Cc: linux-mm@...ck.org, muchun.song@...ux.dev, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/hugetlb: align cma on allocation order, not demotion
 order

On Tue, Apr 30, 2024 at 04:14:37PM +0000, Frank van der Linden wrote:
> Align the CMA area for hugetlb gigantic pages to their size, not the
> size that they can be demoted to. Otherwise there might be misaligned
> sections at the start and end of the CMA area that will never be used
> for hugetlb page allocations.
> 
> Signed-off-by: Frank van der Linden <fvdl@...gle.com>
> Cc: Roman Gushchin <roman.gushchin@...ux.dev>
> Fixes: a01f43901cfb ("hugetlb: be sure to free demoted CMA pages to CMA")

Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>

Thanks!