diff options
| author |   Mike Marciniszyn <mike.marciniszyn@intel.com> | 2012-06-27 18:33:19 -0400 |
|---|---|---|
| committer |   Roland Dreier <roland@purestorage.com> | 2012-07-08 18:05:19 -0700 |
| commit | 8aac4cc3a9d7d7c2f203b7a8db521b604cfb5dc9 (patch) | |
| tree | f9e98f1fd7df79a1577c77d74b7242fa16b9a74d /drivers/infiniband/hw/qib/qib_verbs.c | |
| parent | IB/qib: Avoid returning EBUSY from MR deregister (diff) | |
| download | linux-dev-8aac4cc3a9d7d7c2f203b7a8db521b604cfb5dc9.tar.xz linux-dev-8aac4cc3a9d7d7c2f203b7a8db521b604cfb5dc9.zip | |
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.c | 4 |
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 76d7ce8a8c6e..59cdea345a82 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; |