linux-kernel - Re: [PATCH v5 1/2] iommu/iova: Retry from last rb tree node if iova search fails

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Date:   Tue, 17 Nov 2020 23:24:29 +0000
From:   Will Deacon <will@...nel.org>
To:     "vjitta@...eaurora.org" <vjitta@...eaurora.org>, joro@...tes.org,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, robin.murphy@....com,
        vinmenon@...eaurora.org
Subject: Re: [PATCH v5 1/2] iommu/iova: Retry from last rb tree node if iova search fails

On Wed, 30 Sep 2020 13:14:23 +0530, vjitta@...eaurora.org wrote:
> When ever a new iova alloc request comes iova is always searched
> from the cached node and the nodes which are previous to cached
> node. So, even if there is free iova space available in the nodes
> which are next to the cached node iova allocation can still fail
> because of this approach.
> 
> Consider the following sequence of iova alloc and frees on
> 1GB of iova space
> 
> [...]

Applied to arm64 (for-next/iommu/iova), thanks!

[1/2] iommu/iova: Retry from last rb tree node if iova search fails
      https://git.kernel.org/arm64/c/4e89dce72521
[2/2] iommu/iova: Free global iova rcache on iova alloc failure
      https://git.kernel.org/arm64/c/6fa3525b455a

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev