diff options
| author | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2016-07-05 08:35:15 +0300 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2017-01-03 01:02:59 +0300 |
| commit | 3289025aedc018f8fd9d0e37fb9efa0c6d531ffa (patch) | |
| tree | 251ddb4c6606d91809d98d40a22e18382025664e /net/rds/recv.c | |
| parent | f9fb69adb6c7acca60977a4db5a5f95b8e66c041 (diff) | |
| download | linux-3289025aedc018f8fd9d0e37fb9efa0c6d531ffa.tar.xz | |
RDS: add receive message trace used by application
Socket option to tap receive path latency in various stages
in nano seconds. It can be enabled on selective sockets using
using SO_RDS_MSG_RXPATH_LATENCY socket option. RDS will return
the data to application with RDS_CMSG_RXPATH_LATENCY in defined
format. Scope is left to add more trace points for future
without need of change in the interface.
Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Diffstat (limited to 'net/rds/recv.c')
| -rw-r--r-- | net/rds/recv.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/net/rds/recv.c b/net/rds/recv.c index ba19eeeae85a..8b7e7b7f2c2d 100644 --- a/net/rds/recv.c +++ b/net/rds/recv.c @@ -43,6 +43,8 @@ void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, __be32 saddr) { + int i; + atomic_set(&inc->i_refcount, 1); INIT_LIST_HEAD(&inc->i_item); inc->i_conn = conn; @@ -50,6 +52,9 @@ void rds_inc_init(struct rds_incoming *inc, struct rds_connection *conn, inc->i_rdma_cookie = 0; inc->i_rx_tstamp.tv_sec = 0; inc->i_rx_tstamp.tv_usec = 0; + + for (i = 0; i < RDS_RX_MAX_TRACES; i++) + inc->i_rx_lat_trace[i] = 0; } EXPORT_SYMBOL_GPL(rds_inc_init); @@ -373,6 +378,7 @@ void rds_recv_incoming(struct rds_connection *conn, __be32 saddr, __be32 daddr, if (sock_flag(sk, SOCK_RCVTSTAMP)) do_gettimeofday(&inc->i_rx_tstamp); rds_inc_addref(inc); + inc->i_rx_lat_trace[RDS_MSG_RX_END] = local_clock(); list_add_tail(&inc->i_item, &rs->rs_recv_queue); __rds_wake_sk_sleep(sk); } else { @@ -534,7 +540,7 @@ static int rds_cmsg_recv(struct rds_incoming *inc, struct msghdr *msg, ret = put_cmsg(msg, SOL_RDS, RDS_CMSG_RDMA_DEST, sizeof(inc->i_rdma_cookie), &inc->i_rdma_cookie); if (ret) - return ret; + goto out; } if ((inc->i_rx_tstamp.tv_sec != 0) && @@ -543,10 +549,30 @@ static int rds_cmsg_recv(struct rds_incoming *inc, struct msghdr *msg, sizeof(struct timeval), &inc->i_rx_tstamp); if (ret) - return ret; + goto out; } - return 0; + if (rs->rs_rx_traces) { + struct rds_cmsg_rx_trace t; + int i, j; + + inc->i_rx_lat_trace[RDS_MSG_RX_CMSG] = local_clock(); + t.rx_traces = rs->rs_rx_traces; + for (i = 0; i < rs->rs_rx_traces; i++) { + j = rs->rs_rx_trace[i]; + t.rx_trace_pos[i] = j; + t.rx_trace[i] = inc->i_rx_lat_trace[j + 1] - + inc->i_rx_lat_trace[j]; + } + + ret = put_cmsg(msg, SOL_RDS, RDS_CMSG_RXPATH_LATENCY, + sizeof(t), &t); + if (ret) + goto out; + } + +out: + return ret; } int rds_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |