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From: Qian Cai <cai@lca.pw>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch v3 0/3] iommu: reduce spinlock contention on fast path
Date: Fri, 6 Dec 2019 16:57:57 -0500	[thread overview]
Message-ID: <1CDA04A5-9EF1-4B6F-8461-37361D6460E2@lca.pw> (raw)
In-Reply-To: <20191206213803.12580-1-xiyou.wangcong@gmail.com>



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


WARNING: multiple messages have this Message-ID (diff)
From: Qian Cai <cai@lca.pw>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: [Patch v3 0/3] iommu: reduce spinlock contention on fast path
Date: Fri, 6 Dec 2019 16:57:57 -0500	[thread overview]
Message-ID: <1CDA04A5-9EF1-4B6F-8461-37361D6460E2@lca.pw> (raw)
In-Reply-To: <20191206213803.12580-1-xiyou.wangcong@gmail.com>



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

_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply	other threads:[~2019-12-06 21:58 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 21:38 [Patch v3 0/3] iommu: reduce spinlock contention on fast path Cong Wang
2019-12-06 21:38 ` Cong Wang
2019-12-06 21:38 ` [Patch v3 1/3] iommu: avoid unnecessary magazine allocations Cong Wang
2019-12-06 21:38   ` Cong Wang
2019-12-06 21:38 ` [Patch v3 2/3] iommu: optimize iova_magazine_free_pfns() Cong Wang
2019-12-06 21:38   ` Cong Wang
2019-12-06 21:38 ` [Patch v3 3/3] iommu: avoid taking iova_rbtree_lock twice Cong Wang
2019-12-06 21:38   ` Cong Wang
2019-12-06 21:57 ` Qian Cai [this message]
2019-12-06 21:57   ` [Patch v3 0/3] iommu: reduce spinlock contention on fast path Qian Cai
2019-12-10 14:53 ` John Garry
2019-12-10 14:53   ` John Garry
2019-12-18  4:39 Cong Wang
2019-12-18  4:39 ` Cong Wang
2020-01-20 23:10 ` Cong Wang
2020-01-20 23:10   ` Cong Wang

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