linux-kernel - Re: [PATCH 3/3] dma-pool: limit DMA and DMA32 zone size pools

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Message-ID: <20220822111447.GA8935@lst.de>
Date:   Mon, 22 Aug 2022 13:14:47 +0200
From:   Christoph Hellwig <hch@....de>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Christoph Hellwig <hch@....de>, iommu@...ts.linux.dev,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] dma-pool: limit DMA and DMA32 zone size pools

On Mon, Aug 22, 2022 at 10:41:01AM +0200, Michal Hocko wrote:
> ZONE_DMA existance is not runtime controlable (at least on x86).

This is more about ZONE_DMA32 that can disappear if all memory is
inside ZONE_DMA.  That is highly unusual (but still possible) with a
tiny x86-style ZONE_DMA, but can happen with a larger one other
architectures.