rds: per-rm flush_wait waitq

This removes a global waitqueue used to wait for rds messages
and replaces it with a waitqueue inside the rds_message struct.

The global waitqueue turns into a global lock and significantly
bottlenecks operations on large machines.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/rds/rds.h b/net/rds/rds.h
index b57cb50c1f22..c22bd7b49460 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -301,6 +301,8 @@ struct rds_message {
          *   -> rs->rs_lock
          */
         spinlock_t              m_rs_lock;
+        wait_queue_head_t       m_flush_wait;
+
         struct rds_sock         *m_rs;
 
         /* cookie to send to remote, in rds header */