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SUNRPC: Replace xprt->resend and xprt->sending with a priority queue 

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2011-07-17 18:11:34 -04:00
parent 3b27bad7f7
commit 34006cee28
2 changed files with 21 additions and 22 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -165,7 +165,6 @@ struct rpc_xprt {
struct rpc_wait_queue binding; /* requests waiting on rpcbind */
struct rpc_wait_queue sending; /* requests waiting to send */
struct rpc_wait_queue resend; /* requests waiting to resend */
struct rpc_wait_queue pending; /* requests in flight */
struct rpc_wait_queue backlog; /* waiting for slot */
struct list_head free; /* free slots */

42
net/sunrpc/xprt.c
View File

@ -195,6 +195,7 @@ EXPORT_SYMBOL_GPL(xprt_load_transport);
int xprt_reserve_xprt(struct rpc_xprt *xprt, struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
int priority;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
if (task == xprt->snd_task)
@ -214,10 +215,13 @@ out_sleep:
task->tk_pid, xprt);
task->tk_timeout = 0;
task->tk_status = -EAGAIN;
if (req != NULL && req->rq_ntrans)
rpc_sleep_on(&xprt->resend, task, NULL);
if (req == NULL)
priority = RPC_PRIORITY_LOW;
else if (!req->rq_ntrans)
priority = RPC_PRIORITY_NORMAL;
else
rpc_sleep_on(&xprt->sending, task, NULL);
priority = RPC_PRIORITY_HIGH;
rpc_sleep_on_priority(&xprt->sending, task, NULL, priority);
return 0;
}
EXPORT_SYMBOL_GPL(xprt_reserve_xprt);
@ -244,6 +248,7 @@ static void xprt_clear_locked(struct rpc_xprt *xprt)
int xprt_reserve_xprt_cong(struct rpc_xprt *xprt, struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
int priority;
if (test_and_set_bit(XPRT_LOCKED, &xprt->state)) {
if (task == xprt->snd_task)
@ -265,10 +270,13 @@ out_sleep:
dprintk("RPC: %5u failed to lock transport %p\n", task->tk_pid, xprt);
task->tk_timeout = 0;
task->tk_status = -EAGAIN;
if (req != NULL && req->rq_ntrans)
rpc_sleep_on(&xprt->resend, task, NULL);
if (req == NULL)
priority = RPC_PRIORITY_LOW;
else if (!req->rq_ntrans)
priority = RPC_PRIORITY_NORMAL;
else
rpc_sleep_on(&xprt->sending, task, NULL);
priority = RPC_PRIORITY_HIGH;
rpc_sleep_on_priority(&xprt->sending, task, NULL, priority);
return 0;
}
EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong);
@ -291,12 +299,9 @@ static void __xprt_lock_write_next(struct rpc_xprt *xprt)
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
return;
task = rpc_wake_up_next(&xprt->resend);
if (!task) {
task = rpc_wake_up_next(&xprt->sending);
if (task == NULL)
goto out_unlock;
}
task = rpc_wake_up_next(&xprt->sending);
if (task == NULL)
goto out_unlock;
req = task->tk_rqstp;
xprt->snd_task = task;
@ -319,12 +324,9 @@ static void __xprt_lock_write_next_cong(struct rpc_xprt *xprt)
return;
if (RPCXPRT_CONGESTED(xprt))
goto out_unlock;
task = rpc_wake_up_next(&xprt->resend);
if (!task) {
task = rpc_wake_up_next(&xprt->sending);
if (task == NULL)
goto out_unlock;
}
task = rpc_wake_up_next(&xprt->sending);
if (task == NULL)
goto out_unlock;
req = task->tk_rqstp;
if (req == NULL) {
@ -1177,8 +1179,7 @@ static void xprt_init(struct rpc_xprt *xprt, struct net *net)
rpc_init_wait_queue(&xprt->binding, "xprt_binding");
rpc_init_wait_queue(&xprt->pending, "xprt_pending");
rpc_init_wait_queue(&xprt->sending, "xprt_sending");
rpc_init_wait_queue(&xprt->resend, "xprt_resend");
rpc_init_priority_wait_queue(&xprt->sending, "xprt_sending");
rpc_init_priority_wait_queue(&xprt->backlog, "xprt_backlog");
xprt_init_xid(xprt);
@ -1240,7 +1241,6 @@ static void xprt_destroy(struct rpc_xprt *xprt)
rpc_destroy_wait_queue(&xprt->binding);
rpc_destroy_wait_queue(&xprt->pending);
rpc_destroy_wait_queue(&xprt->sending);
rpc_destroy_wait_queue(&xprt->resend);
rpc_destroy_wait_queue(&xprt->backlog);
cancel_work_sync(&xprt->task_cleanup);
/*