RDS: only put sockets that have seen congestion on the poll_waitq
authorAndy Grover <andy.grover@oracle.com>
Thu, 11 Mar 2010 13:50:04 +0000 (13:50 +0000)
committerDavid S. Miller <davem@davemloft.net>
Wed, 17 Mar 2010 04:16:59 +0000 (21:16 -0700)
commitb98ba52f96e7cdb4dbe2b06bced83d95d94c9d02
tree72e22772c6326ff554bd030bda35abcb1526249e
parent550a8002e4340eaf3bc333e33b59427e9c20272d
RDS: only put sockets that have seen congestion on the poll_waitq

rds_poll_waitq's listeners will be awoken if we receive a congestion
notification. Bad performance may result because *all* polled sockets
contend for this single lock. However, it should not be necessary to
wake pollers when a congestion update arrives if they have never
experienced congestion, and not putting these on the waitq will
hopefully greatly reduce contention.

Signed-off-by: Andy Grover <andy.grover@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/rds/af_rds.c
net/rds/rds.h
net/rds/send.c