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authorChris Mason <chris.mason@oracle.com>2010-05-12 02:09:45 +0400
committerAndy Grover <andy.grover@oracle.com>2010-09-09 05:15:08 +0400
commit38a4e5e61344490f18241333d7b1b368a3a38748 (patch)
tree60268171e32aff9938334806d0debd5c35b3dc56 /net/rds/af_rds.c
parente4c52c98e04937ea87b0979a81354d0040d284f9 (diff)
downloadlinux-38a4e5e61344490f18241333d7b1b368a3a38748.tar.xz
rds: Use RCU for the bind lookup searches
The RDS bind lookups are somewhat expensive in terms of CPU time and locking overhead. This commit changes them into a faster RCU based hash tree instead of the rbtrees they were using before. On large NUMA systems it is a significant improvement. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'net/rds/af_rds.c')
-rw-r--r--net/rds/af_rds.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/rds/af_rds.c b/net/rds/af_rds.c
index ef09340cf7a9..f16d2a92cb89 100644
--- a/net/rds/af_rds.c
+++ b/net/rds/af_rds.c
@@ -72,7 +72,15 @@ static int rds_release(struct socket *sock)
* with the socket. */
rds_clear_recv_queue(rs);
rds_cong_remove_socket(rs);
+
+ /*
+ * the binding lookup hash uses rcu, we need to
+ * make sure we sychronize_rcu before we free our
+ * entry
+ */
rds_remove_bound(rs);
+ synchronize_rcu();
+
rds_send_drop_to(rs, NULL);
rds_rdma_drop_keys(rs);
rds_notify_queue_get(rs, NULL);