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authorAndy Grover <andy.grover@oracle.com>2010-03-24 03:39:07 +0300
committerAndy Grover <andy.grover@oracle.com>2010-09-09 05:12:12 +0400
commit049ee3f500954176a87f22e6ee3e98aecb1b8958 (patch)
tree5dfd8cf3e6d9a7a15e80f6ddee7f4ce7c4aa7a8c /net/rds/rds.h
parentf17a1a55fb672d7f64be7f2e940ef5669e5efa0a (diff)
downloadlinux-049ee3f500954176a87f22e6ee3e98aecb1b8958.tar.xz
RDS: Change send lock from a mutex to a spinlock
This change allows us to call rds_send_xmit() from a tasklet, which is crucial to our new operating model. * Change c_send_lock to a spinlock * Update stats fields "sem_" to "_lock" * Remove unneeded rds_conn_is_sending() About locking between shutdown and send -- send checks if the connection is up. Shutdown puts the connection into DISCONNECTING. After this, all threads entering send will exit immediately. However, a thread could be *in* send_xmit(), so shutdown acquires the c_send_lock to ensure everyone is out before proceeding with connection shutdown. Signed-off-by: Andy Grover <andy.grover@oracle.com>
Diffstat (limited to 'net/rds/rds.h')
-rw-r--r--net/rds/rds.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/rds/rds.h b/net/rds/rds.h
index e81d7e478474..c3a668b9cc14 100644
--- a/net/rds/rds.h
+++ b/net/rds/rds.h
@@ -91,7 +91,7 @@ struct rds_connection {
struct rds_cong_map *c_lcong;
struct rds_cong_map *c_fcong;
- struct mutex c_send_lock; /* protect send ring */
+ spinlock_t c_send_lock; /* protect send ring */
struct rds_message *c_xmit_rm;
unsigned long c_xmit_sg;
unsigned int c_xmit_hdr_off;
@@ -548,8 +548,8 @@ struct rds_statistics {
uint64_t s_recv_ping;
uint64_t s_send_queue_empty;
uint64_t s_send_queue_full;
- uint64_t s_send_sem_contention;
- uint64_t s_send_sem_queue_raced;
+ uint64_t s_send_lock_contention;
+ uint64_t s_send_lock_queue_raced;
uint64_t s_send_immediate_retry;
uint64_t s_send_delayed_retry;
uint64_t s_send_drop_acked;