tree 1322d01102b150a8c04d2815fee1935efc951b76
parent 497a5df7bf6ffd136ae21c49d1a01292930d7ca2
author Sowmini Varadhan <sowmini.varadhan@oracle.com> 1426204955 -0400
committer David S. Miller <davem@davemloft.net> 1429213495 -0700

sparc: Break up monolithic iommu table/lock into finer graularity pools and lock

Investigation of multithreaded iperf experiments on an ethernet
interface show the iommu->lock as the hottest lock identified by
lockstat, with something of the order of  21M contentions out of
27M acquisitions, and an average wait time of 26 us for the lock.
This is not efficient. A more scalable design is to follow the ppc
model, where the iommu_table has multiple pools, each stretching
over a segment of the map, and with a separate lock for each pool.
This model allows for better parallelization of the iommu map search.

This patch adds the iommu range alloc/free function infrastructure.

Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>