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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(-)


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