Re: [Patch v3 0/3] iommu: reduce spinlock contention on fast path

[Qian Cai]

> On Dec 6, 2019, at 4:38 PM, Cong Wang <xiyou.wangcong@xxxxxxxxx> wrote:
> 
> This patchset contains three small optimizations for the global spinlock
> contention in IOVA cache. Our memcache perf test shows this reduced its
> p999 latency down by 45% on AMD when IOMMU is enabled.

Can you at least have a changelog compared to previous versions?

> 
> Cong Wang (3):
>  iommu: avoid unnecessary magazine allocations
>  iommu: optimize iova_magazine_free_pfns()
>  iommu: avoid taking iova_rbtree_lock twice
> ---
> drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------
> 1 file changed, 45 insertions(+), 30 deletions(-)
> 
> -- 
> 2.21.0
> 
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