From: Rik van Riel <riel@surriel.com>
To: "Liam R. Howlett" <liam@infradead.org>, Jason Gunthorpe <jgg@ziepe.ca>
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
robin.murphy@arm.com, joro@8bytes.org, will@kernel.org,
iommu@lists.linux.dev, kyle@mcmartin.ca,
Rik van Riel <riel@meta.com>,
maple-tree@lists.infradead.org
Subject: Re: [PATCH v3 3/3] iova: defer maple tree erase on GFP_ATOMIC failure
Date: Thu, 18 Jun 2026 13:30:52 -0400 [thread overview]
Message-ID: <fc0bdfd6e0ddcbde208dff785ea0ce7f41d1f875.camel@surriel.com> (raw)
In-Reply-To: <r4jlbi3hbtvv6vrenarz6i7n6cu3vfqqdz2jfenkwsuv3fkadi@nq5u5txbtso6>
On Thu, 2026-06-18 at 13:27 -0400, Liam R. Howlett wrote:
> On 26/06/18 12:24PM, Jason Gunthorpe wrote:
> >
> >
> > - I like your idea for Rik to try to store NULL to erase, on
> > failure
> > store ZERO_ENTRY, and then set a note on the next alloc to clean
> > the
> > ZERO_ENTRYs?
>
> The ZERO_ENTRY can be found by mas_* functions and will cause issues
> with the gap searching. You also have to be careful to handle these
> entries in mas_for_each() loops - you don't want to treat them as
> valid
> entries.
>
Could it make sense for the maple tree to have
something similar to ZERO_ENTRY that is treated
like a gap, so the gap search can find it, and
get rid of those entries when the gap gets re-used?
--
All Rights Reversed.
next prev parent reply other threads:[~2026-06-18 17:31 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-03 3:35 [PATCH v3 0/3] iova: use maple tree for O(log n) allocation Rik van Riel
2026-06-03 3:35 ` [PATCH v3 1/3] iova: convert from rbtree to maple tree Rik van Riel
2026-06-17 19:55 ` Liam R. Howlett
2026-06-19 3:47 ` Rik van Riel
2026-06-03 3:35 ` [PATCH v3 2/3] iova: add KUnit test suite Rik van Riel
2026-06-03 3:35 ` [PATCH v3 3/3] iova: defer maple tree erase on GFP_ATOMIC failure Rik van Riel
2026-06-09 13:04 ` Jason Gunthorpe
2026-06-11 2:22 ` Rik van Riel
2026-06-12 16:02 ` Rik van Riel
2026-06-12 16:48 ` Jason Gunthorpe
2026-06-12 17:23 ` Rik van Riel
2026-06-12 18:03 ` Jason Gunthorpe
2026-06-12 18:44 ` Liam R. Howlett
2026-06-15 11:56 ` Jason Gunthorpe
2026-06-17 17:45 ` Liam R. Howlett
2026-06-17 18:04 ` Jason Gunthorpe
2026-06-18 14:50 ` Liam R. Howlett
2026-06-18 15:24 ` Jason Gunthorpe
2026-06-18 17:27 ` Liam R. Howlett
2026-06-18 17:30 ` Rik van Riel [this message]
2026-06-18 19:13 ` Liam R. Howlett
2026-06-19 12:08 ` Jason Gunthorpe
2026-06-30 18:39 ` Liam R. Howlett
2026-06-19 3:51 ` Rik van Riel
2026-06-19 4:54 ` Liam R. Howlett
2026-06-19 12:13 ` Jason Gunthorpe
2026-06-19 18:54 ` Rik van Riel
2026-06-21 0:08 ` Ashok Raj
2026-06-21 1:53 ` Rik van Riel
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