linux-kernel - Re: [PATCH 0/3] dma-mapping: Improve atomic pool behaviour

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Message-ID: <643b75da-d673-4106-888f-7fe232dccf7b@samsung.com>
Date: Tue, 13 Jan 2026 23:59:05 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Robin Murphy <robin.murphy@....com>, akpm@...ux-foundation.org,
	vbabka@...e.cz, david@...nel.org
Cc: bhe@...hat.com, iommu@...ts.linux-foundation.org, linux-mm@...ck.org,
	vladimir.kondratiev@...ileye.com, s-adivi@...com,
	linux-kernel@...r.kernel.org, lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com, rppt@...nel.org, surenb@...gle.com,
	mhocko@...e.com, jackmanb@...gle.com, hannes@...xchg.org, ziy@...dia.com
Subject: Re: [PATCH 0/3] dma-mapping: Improve atomic pool behaviour

On 12.01.2026 16:46, Robin Murphy wrote:
> These days we have somewhat of a matrix of mm zones that may or may not
> exist and may or may not be empty, which the per-zone atomic pool logic
> doesn't actually handle all that well. It's not all that difficult to
> improve robustness and reduce redundancy, so that's what this series
> aims for.
>
> I initially wrote this just because I happened to be looking through the
> boot log of one of my boards and had one of those out-of-the-blue
> realisations of "hang on, why *is* it allocating pools for zones it
> doesn't even have memory in?", but coincidentally, it seems that others
> happened to notice related aspects around the same time[1][2]. This is
> my attempt to sort it all out properly.
>
> I guess this could go via either the dma-mapping or mm tree, whichever
> maintainers prefer.

I will take this patchset to dma-mapping-fixes branch, thanks!

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland