netdev - Re: [RFC] shrinking struct page (part of page pool)

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Message-ID: <aCF4Bm-2cpU__QDA@infradead.org>
Date: Sun, 11 May 2025 21:24:38 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Andrew Lunn <andrew@...n.ch>
Cc: Ilias Apalodimas <ilias.apalodimas@...aro.org>,
	Jakub Kicinski <kuba@...nel.org>, Byungchul Park <byungchul@...com>,
	willy@...radead.org, almasrymina@...gle.com,
	kernel_team@...ynix.com, 42.hyeyoo@...il.com, linux-mm@...ck.org,
	hawk@...nel.org, netdev@...r.kernel.org
Subject: Re: [RFC] shrinking struct page (part of page pool)

On Sat, May 10, 2025 at 03:53:47PM +0200, Andrew Lunn wrote:
> > Random thoughts here until I look at the patches.
> > The concept of devices doing DMA + recycling the used buffer
> > transcends networking.
> 
> Do you know of any other subsystem which takes a page, splits it into
> two, and then uses each half independently for DMA and recycling. A
> typical packet is 1514 octets, so you can get two in a page.

The mm/dmapool.c code is all about this.