From: Jason Gunthorpe <jgg@ziepe.ca>
To: Mostafa Saleh <smostafa@google.com>
Cc: Pranjal Shrivastava <praan@google.com>,
Joerg Roedel <joro@8bytes.org>, Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Kevin Tian <kevin.tian@intel.com>,
Daniel Mentz <danielmentz@google.com>,
Samiullah Khawaja <skhawaja@google.com>,
Logan Odell <loganodell@google.com>,
iommu@lists.linux.dev, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/5] iommupt: Introduce IO page table shrinker
Date: Mon, 9 Nov 2026 10:52:50 -0400 [thread overview]
Message-ID: <20261109145250.GO663069@ziepe.ca> (raw)
In-Reply-To: <avG97sxE2NFZFtvE@google.com>
On Mon, Nov 09, 2026 at 12:34:54PM +0000, Mostafa Saleh wrote:
> I believe there is a value in supporting other users beyond IOMMUFD/VFIO
> (eg. DMA domains) or even outside of iommupt, I haven't investigated this,
> but it's worth looking into either integrating the "iommupt clean(gap)"
> idea in the IOVA allocator or more generally rely on refcounting +
> shrinker (or other method).
The main point is to avoid the refcounting because that is going to be a
perf negative for everyone..
I think most people should be able to do a clean call, and if it is
routed as a generic domain function that would be fine too
Jason
next prev parent reply other threads:[~2026-11-09 14:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-01 23:02 [RFC PATCH 0/5] iommupt: Introduce IO page table shrinker Pranjal Shrivastava
2026-10-01 23:02 ` [RFC PATCH 1/5] iommu: Add reclaim_list xarray to struct iommu_domain Pranjal Shrivastava
2026-10-01 23:02 ` [RFC PATCH 2/5] iommupt: Implement refcounting logic for Leaf entries Pranjal Shrivastava
2026-10-01 23:02 ` [RFC PATCH 3/5] iommupt: Add lockless sever_branch helper Pranjal Shrivastava
2026-10-01 23:02 ` [RFC PATCH 4/5] iommupt: Introduce lockless page table shrinker Pranjal Shrivastava
2026-10-01 23:02 ` [RFC PATCH 5/5] iommupt: Return real page count to the shrinker core Pranjal Shrivastava
2026-10-02 15:08 ` [RFC PATCH 0/5] iommupt: Introduce IO page table shrinker Jason Gunthorpe
2026-10-05 4:58 ` Pranjal Shrivastava
2026-11-09 12:34 ` Mostafa Saleh
2026-11-09 14:52 ` Jason Gunthorpe [this message]
2026-10-03 8:10 ` [syzbot ci] " syzbot ci
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