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

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Message-Id: <20191121001348.27230-1-xiyou.wangcong@gmail.com>
Date:   Wed, 20 Nov 2019 16:13:45 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     iommu@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org, joro@...tes.org,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: [PATCH 0/3] iommu: reduce spinlock contention on fast path

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.

Cong Wang (3):
  iommu: match the original algorithm
  iommu: optimize iova_magazine_free_pfns()
  iommu: avoid taking iova_rbtree_lock twice

---
 drivers/iommu/iova.c | 44 +++++++++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 19 deletions(-)

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2.21.0