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authorMike Marciniszyn <mike.marciniszyn@intel.com>2012-06-27 18:33:19 -0400
committerRoland Dreier <roland@purestorage.com>2012-07-08 18:05:19 -0700
commit8aac4cc3a9d7d7c2f203b7a8db521b604cfb5dc9 (patch)
treef9e98f1fd7df79a1577c77d74b7242fa16b9a74d /drivers/infiniband/hw/qib/qib_verbs.c
parent6a82649f217023863d6b1740017e6c3dd6685327 (diff)
IB/qib: RCU locking for MR validation
Profiling indicates that MR validation locking is expensive. The MR table is largely read-only and is a suitable candidate for RCU locking. The patch uses RCU locking during validation to eliminate one lock/unlock during that validation. Reviewed-by: Mike Heinz <michael.william.heinz@intel.com> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/qib/qib_verbs.c')
-rw-r--r--drivers/infiniband/hw/qib/qib_verbs.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 76d7ce8a8c6..59cdea345a8 100644
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -2066,7 +2066,9 @@ int qib_register_ib_device(struct qib_devdata *dd)
ret = -ENOMEM;
goto err_lk;
}
- memset(dev->lk_table.table, 0, lk_tab_size);
+ RCU_INIT_POINTER(dev->dma_mr, NULL);
+ for (i = 0; i < dev->lk_table.max; i++)
+ RCU_INIT_POINTER(dev->lk_table.table[i], NULL);
INIT_LIST_HEAD(&dev->pending_mmaps);
spin_lock_init(&dev->pending_lock);
dev->mmap_offset = PAGE_SIZE;