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

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Message-Id: <1CDA04A5-9EF1-4B6F-8461-37361D6460E2@lca.pw>
Date:   Fri, 6 Dec 2019 16:57:57 -0500
From:   Qian Cai <cai@....pw>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 0/3] iommu: reduce spinlock contention on fast path

> On Dec 6, 2019, at 4:38 PM, Cong Wang <xiyou.wangcong@...il.com> 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
> 
> _______________________________________________
> iommu mailing list
> iommu@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu

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