[Patch v2 0/3] iommu: reduce spinlock contention on fast path

Cong Wang
2019-11-29T00:49:23Z

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

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

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2.21.0