From: Christoph Hellwig <hch@lst.de>
To: Robin Murphy <robin.murphy@arm.com>
Cc: Christoph Hellwig <hch@lst.de>,
m.szyprowski@samsung.com, yajun.deng@linux.dev,
iommu@lists.linux.dev
Subject: Re: [PATCH] dma-contiguous: fix the Kconfig entry for CONFIG_DMA_NUMA_CMA
Date: Wed, 30 Aug 2023 13:54:31 +0200 [thread overview]
Message-ID: <20230830115431.GA23190@lst.de> (raw)
In-Reply-To: <a33702d2-6024-0129-588d-ce1a879f825c@arm.com>
On Wed, Aug 30, 2023 at 11:11:29AM +0100, Robin Murphy wrote:
> I think the "good reason" is that folks who do have NUMA systems are likely
> to be more interested in getting more consistent DMA performance than
> losing a bit more non-movable memory capacity, and the runtime impact on
> non-NUMA systems should be negligible, so I would definitely be inclined to
> make it "default y". But it's not critically important.
Well, Linus hates these default y, and usually for a good reason.
If it's that useful/importanst for numa systems we should just drop
the option and make the code conditional on CONFIG_NUMA only.
next prev parent reply other threads:[~2023-08-30 11:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-30 9:27 [PATCH] dma-contiguous: fix the Kconfig entry for CONFIG_DMA_NUMA_CMA Christoph Hellwig
2023-08-30 10:11 ` Robin Murphy
2023-08-30 11:54 ` Christoph Hellwig [this message]
2023-08-30 12:04 ` Robin Murphy
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