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SUNRPC: Add a per-rpc_clnt spinlock

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Use that to protect the rpc_clnt->cl_tasks list instead of using a global
lock.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust
2007-06-16 14:17:01 -04:00
parent 6529eba08f
commit 4bef61ff75
3 changed files with 30 additions and 20 deletions
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47
net/sunrpc/sched.c
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@@ -270,17 +270,22 @@ static int rpc_wait_bit_interruptible(void *word)
static void rpc_set_active(struct rpc_task *task)
{
struct rpc_clnt *clnt;
if (test_and_set_bit(RPC_TASK_ACTIVE, &task->tk_runstate) != 0)
return;
spin_lock(&rpc_sched_lock);
#ifdef RPC_DEBUG
task->tk_magic = RPC_TASK_MAGIC_ID;
spin_lock(&rpc_sched_lock);
task->tk_pid = rpc_task_id++;
spin_unlock(&rpc_sched_lock);
#endif
/* Add to global list of all tasks */
if (task->tk_client)
list_add_tail(&task->tk_task, &task->tk_client->cl_tasks);
spin_unlock(&rpc_sched_lock);
clnt = task->tk_client;
if (clnt != NULL) {
spin_lock(&clnt->cl_lock);
list_add_tail(&task->tk_task, &clnt->cl_tasks);
spin_unlock(&clnt->cl_lock);
}
}
/*
@@ -924,10 +929,11 @@ static void rpc_release_task(struct rpc_task *task)
dprintk("RPC: %5u release task\n", task->tk_pid);
if (!list_empty(&task->tk_task)) {
struct rpc_clnt *clnt = task->tk_client;
/* Remove from client task list */
spin_lock(&rpc_sched_lock);
spin_lock(&clnt->cl_lock);
list_del(&task->tk_task);
spin_unlock(&rpc_sched_lock);
spin_unlock(&clnt->cl_lock);
}
BUG_ON (RPC_IS_QUEUED(task));
@@ -970,12 +976,19 @@ EXPORT_SYMBOL(rpc_run_task);
* Kill all tasks for the given client.
* XXX: kill their descendants as well?
*/
static void rpc_killall_tasks_locked(struct list_head *head)
void rpc_killall_tasks(struct rpc_clnt *clnt)
{
struct rpc_task *rovr;
list_for_each_entry(rovr, head, tk_task) {
if (list_empty(&clnt->cl_tasks))
return;
dprintk("RPC: killing all tasks for client %p\n", clnt);
/*
* Spin lock all_tasks to prevent changes...
*/
spin_lock(&clnt->cl_lock);
list_for_each_entry(rovr, &clnt->cl_tasks, tk_task) {
if (! RPC_IS_ACTIVATED(rovr))
continue;
if (!(rovr->tk_flags & RPC_TASK_KILLED)) {
@@ -984,17 +997,7 @@ static void rpc_killall_tasks_locked(struct list_head *head)
rpc_wake_up_task(rovr);
}
}
}
void rpc_killall_tasks(struct rpc_clnt *clnt)
{
dprintk("RPC: killing all tasks for client %p\n", clnt);
/*
* Spin lock all_tasks to prevent changes...
*/
spin_lock(&rpc_sched_lock);
rpc_killall_tasks_locked(&clnt->cl_tasks);
spin_unlock(&rpc_sched_lock);
spin_unlock(&clnt->cl_lock);
}
static void rpciod_killall(void)
@@ -1007,7 +1010,7 @@ static void rpciod_killall(void)
spin_lock(&rpc_sched_lock);
list_for_each_entry(clnt, &all_clients, cl_clients)
rpc_killall_tasks_locked(&clnt->cl_tasks);
rpc_killall_tasks(clnt);
spin_unlock(&rpc_sched_lock);
flush_workqueue(rpciod_workqueue);
if (!list_empty(&all_clients))
@@ -1110,6 +1113,9 @@ void rpc_show_tasks(void)
printk("-pid- proc flgs status -client- -prog- --rqstp- -timeout "
"-rpcwait -action- ---ops--\n");
list_for_each_entry(clnt, &all_clients, cl_clients) {
if (list_empty(&clnt->cl_tasks))
continue;
spin_lock(&clnt->cl_lock);
list_for_each_entry(t, &clnt->cl_tasks, tk_task) {
const char *rpc_waitq = "none";
@@ -1126,6 +1132,7 @@ void rpc_show_tasks(void)
rpc_waitq,
t->tk_action, t->tk_ops);
}
spin_unlock(&clnt->cl_lock);
}
out:
spin_unlock(&rpc_sched_lock);