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

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