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authorAndy Grover <andy.grover@oracle.com>2010-03-11 13:50:04 +0000
committerDavid S. Miller <davem@davemloft.net>2010-03-16 21:16:59 -0700
commitb98ba52f96e7cdb4dbe2b06bced83d95d94c9d02 (patch)
tree72e22772c6326ff554bd030bda35abcb1526249e /net/rds/rds.h
parent550a8002e4340eaf3bc333e33b59427e9c20272d (diff)
downloadlwn-b98ba52f96e7cdb4dbe2b06bced83d95d94c9d02.tar.gz
lwn-b98ba52f96e7cdb4dbe2b06bced83d95d94c9d02.zip
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>
Diffstat (limited to 'net/rds/rds.h')
-rw-r--r--net/rds/rds.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h
index 85d6f897ecc7..4bec6e2ed495 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -388,6 +388,8 @@ struct rds_sock {
/* flag indicating we were congested or not */
int rs_congested;
+ /* seen congestion (ENOBUFS) when sending? */
+ int rs_seen_congestion;
/* rs_lock protects all these adjacent members before the newline */
spinlock_t rs_lock;