linux-kernel - Re: [RFC v2 0/3] iommu/intel: Free empty page tables on unmaps

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Message-ID: <20240429144623.GN231144@ziepe.ca>
Date: Mon, 29 Apr 2024 11:46:23 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Matthew Wilcox <willy@...radead.org>
Cc: David Hildenbrand <david@...hat.com>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, rientjes@...gle.com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, joro@...tes.org,
	will@...nel.org, robin.murphy@....com, iommu@...ts.linux.dev
Subject: Re: [RFC v2 0/3] iommu/intel: Free empty page tables on unmaps

On Fri, Apr 26, 2024 at 08:39:14PM +0100, Matthew Wilcox wrote:

> I think there's a lot of space in the struct page that can be used.
> These are iommu page tables, not cpu page tables, so things are a bit
> different for them.  But should they be converted to use ptdesc?  Maybe!

Definately! Someday we will need more stuff in here..

Jason