linux-kernel - Re: [RESEND PATCH v3] iommu/iova: Optimize alloc_iova with rbtree

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Date:   Tue, 8 Nov 2022 11:43:56 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Robin Murphy <robin.murphy@....com>, joro@...tes.org,
        will@...nel.org
Cc:     wangjie125@...wei.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, haifeng.zhao@...ux.intel.com,
        john.garry@...wei.com
Subject: Re: [RESEND PATCH v3] iommu/iova: Optimize alloc_iova with
 rbtree_augmented

> https://lore.kernel.org/linux-iommu/2b0ca6254dd0102bf559b2a73e9b51da089afbe3.1663764627.git.robin.murphy@arm.com/
I don't think this method solves the problem, because sometimes it's 
just that the allocation is very slow, it's not that it can't be allocated.

This is a test of the performance improvement of the network card by 
this patch:
https://lore.kernel.org/lkml/42909903-5b6c-efe8-9ed3-3ac012f1a421@huawei.com/
At least this optimization makes sense.

The only downside of this optimization is that it is more complex, if 
you think it is difficult to maintain it, I can help maintain it.

Thanks,
Peng.