From: Will Deacon <will@kernel.org>
To: Dawei Li <set_pte_at@outlook.com>, joro@8bytes.org, robin.murphy@arm.com
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org, iommu@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] iommu/arm-smmu-v3: Change vmid alloc strategy from bitmap to ida
Date: Tue, 1 Aug 2023 21:41:47 +0100 [thread overview]
Message-ID: <169087904450.1290857.11726985177314533259.b4-ty@kernel.org> (raw)
In-Reply-To: <TYCP286MB2323E0C525FF9F94E3B07C7ACA35A@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COM>
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
https://will.arm64.dev
prev parent reply other threads:[~2023-08-01 20:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-15 16:16 Dawei Li
2023-07-25 13:41 ` Jason Gunthorpe
2023-08-01 20:41 ` Will Deacon [this message]
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