diff options
| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2015-04-09 22:33:30 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-18 22:32:59 +0300 |
| commit | ff7d37a502022149655c18035b99a53391be0383 (patch) | |
| tree | 262ef5021055702d1edfb2982c618720cde4489c /lib/Makefile | |
| parent | c12f048ffdf3a5802239426dc290290929268dc9 (diff) | |
| download | linux-ff7d37a502022149655c18035b99a53391be0383.tar.xz | |
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_map_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>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/Makefile')
| -rw-r--r-- | lib/Makefile | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Makefile b/lib/Makefile index da6116b21555..6c37933336a0 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -106,7 +106,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o obj-$(CONFIG_AUDIT_COMPAT_GENERIC) += compat_audit.o obj-$(CONFIG_SWIOTLB) += swiotlb.o -obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o +obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o iommu-common.o obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o obj-$(CONFIG_NOTIFIER_ERROR_INJECTION) += notifier-error-inject.o obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o |