SUNRPC: track length of RPC wait queues
RPC wait queue length will eventually be exported to userland via the RPC
iostats interface.
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>
diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index a390c9b..6c23f73 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -203,6 +203,7 @@
unsigned char priority; /* current priority */
unsigned char count; /* # task groups remaining serviced so far */
unsigned char nr; /* # tasks remaining for cookie */
+ unsigned short qlen; /* total # tasks waiting in queue */
#ifdef RPC_DEBUG
const char * name;
#endif
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 1b74420..aa0449d 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -181,6 +181,7 @@
else
list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]);
task->u.tk_wait.rpc_waitq = queue;
+ queue->qlen++;
rpc_set_queued(task);
dprintk("RPC: %4d added to queue %p \"%s\"\n",
@@ -215,6 +216,7 @@
__rpc_remove_wait_queue_priority(task);
else
list_del(&task->u.tk_wait.list);
+ queue->qlen--;
dprintk("RPC: %4d removed from queue %p \"%s\"\n",
task->tk_pid, queue, rpc_qname(queue));
}
