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

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Message-Id: <20191218043951.10534-1-xiyou.wangcong@gmail.com>
Date:   Tue, 17 Dec 2019 20:39:48 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     iommu@...ts.linux-foundation.org
Cc:     robin.murphy@....com, linux-kernel@...r.kernel.org,
        joro@...tes.org, Cong Wang <xiyou.wangcong@...il.com>
Subject: [Patch v3 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.

(Resending v3 on Joerg's request.)

Cong Wang (3):
  iommu: avoid unnecessary magazine allocations
  iommu: optimize iova_magazine_free_pfns()
  iommu: avoid taking iova_rbtree_lock twice

---
v3: improve changelog, no code change
v2: fix a memory leak

 drivers/iommu/iova.c | 75 ++++++++++++++++++++++++++------------------
 1 file changed, 45 insertions(+), 30 deletions(-)

-- 
2.21.0