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SUNRPC: introduce per-task RPC iostats 

Account for various things that occur while an RPC task is executed.
Separate timers for RPC round trip and RPC execution time show how
long RPC requests wait in queue before being sent.  Eventually these
will be accumulated at xprt_release time in one place where they can
be viewed from userland.

Test plan:
Compile kernel with CONFIG_NFS enabled.

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2006-03-20 13:44:17 -05:00 committed by Trond Myklebust
parent 262ca07de4
commit ef759a2e54
5 changed files with 14 additions and 0 deletions
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6
include/linux/sunrpc/sched.h
View File

@ -86,6 +86,12 @@ struct rpc_task {
struct work_struct tk_work; /* Async task work queue */
struct rpc_wait tk_wait; /* RPC wait */
} u;
unsigned short tk_timeouts; /* maj timeouts */
size_t tk_bytes_sent; /* total bytes sent */
unsigned long tk_start; /* RPC task init timestamp */
long tk_rtt; /* round-trip time (jiffies) */
#ifdef RPC_DEBUG
unsigned short tk_pid; /* debugging aid */
#endif

2
net/sunrpc/clnt.c
View File

@ -996,6 +996,8 @@ call_timeout(struct rpc_task *task)
}
dprintk("RPC: %4d call_timeout (major)\n", task->tk_pid);
task->tk_timeouts++;
if (RPC_IS_SOFT(task)) {
printk(KERN_NOTICE "%s: server %s not responding, timed out\n",
clnt->cl_protname, clnt->cl_server);

3
net/sunrpc/sched.c
View File

@ -817,6 +817,9 @@ void rpc_init_task(struct rpc_task *task, struct rpc_clnt *clnt, int flags, cons
BUG_ON(task->tk_ops == NULL);
/* starting timestamp */
task->tk_start = jiffies;
dprintk("RPC: %4d new task procpid %d\n", task->tk_pid,
current->pid);
}

2
net/sunrpc/xprt.c
View File

@ -648,6 +648,8 @@ void xprt_complete_rqst(struct rpc_task *task, int copied)
task->tk_pid, ntohl(req->rq_xid), copied);
task->tk_xprt->stat.recvs++;
task->tk_rtt = (long)jiffies - req->rq_xtime;
list_del_init(&req->rq_list);
req->rq_received = req->rq_private_buf.len = copied;
rpc_wake_up_task(task);

1
net/sunrpc/xprtsock.c
View File

@ -382,6 +382,7 @@ static int xs_tcp_send_request(struct rpc_task *task)
/* If we've sent the entire packet, immediately
* reset the count of bytes sent. */
req->rq_bytes_sent += status;
task->tk_bytes_sent += status;
if (likely(req->rq_bytes_sent >= req->rq_slen)) {
req->rq_bytes_sent = 0;
return 0;