linux-kernel - Re: [PATCH] iommu/arm-smmu-v3: Change vmid alloc strategy from bitmap to ida

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Date:   Tue,  1 Aug 2023 21:41:47 +0100
From:   Will Deacon <will@...nel.org>
To:     Dawei Li <set_pte_at@...look.com>, joro@...tes.org,
        robin.murphy@....com
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-v3: Change vmid alloc strategy from bitmap to ida

On Sun, 16 Jul 2023 00:16:21 +0800, Dawei Li wrote:
> For current implementation of vmid allocation of arm smmu-v3, a per-smmu
> devide bitmap of 64K bits(8K bytes) is allocated on behalf of possible VMID
> range, which is two pages for some architectures. Besides that, its memory
> consumption is 'static', despite of how many VMIDs are allocated actually.
> 
> That's memory inefficient and lack of scalability.
> 
> [...]

Applied to will (for-joerg/arm-smmu/updates), thanks!

[1/1] iommu/arm-smmu-v3: Change vmid alloc strategy from bitmap to ida
      https://git.kernel.org/will/c/1672730cffaf

Cheers,
-- 
Will

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