xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

IB/qib: RCU locking for MR validation

Browse Source 
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>
This commit is contained in:
Mike Marciniszyn
2012-06-27 18:33:19 -04:00
committed by Roland Dreier
parent 6a82649f21
commit 8aac4cc3a9
4 changed files with 66 additions and 50 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/infiniband/hw/qib/qib_verbs.c
View File

@@ -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;