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| author | Chuck Lever <chuck.lever@oracle.com> | 2018-03-05 15:13:13 -0500 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2018-04-10 16:06:22 -0400 |
| commit | ff699ea8269a02d977c6ee42d58f76efe83a34f9 (patch) | |
| tree | bc851db38c12b2e4f49847725bee180477068dbf /net/sunrpc | |
| parent | 78215759e20d859b8f1de7d0aebd08878fbc4eed (diff) | |
| download | linux-ff699ea8269a02d977c6ee42d58f76efe83a34f9.tar.gz linux-ff699ea8269a02d977c6ee42d58f76efe83a34f9.tar.bz2 linux-ff699ea8269a02d977c6ee42d58f76efe83a34f9.zip | |
SUNRPC: Make num_reqs a non-atomic integer
If recording xprt->stat.max_slots is moved into xprt_alloc_slot,
then xprt->num_reqs is never manipulated outside
xprt->reserve_lock. There's no longer a need for xprt->num_reqs to
be atomic.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc')
| -rw-r--r-- | net/sunrpc/xprt.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 73f05a1fbc19..70f005044f06 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -1009,7 +1009,7 @@ void xprt_transmit(struct rpc_task *task) struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; unsigned int connect_cookie; - int status, numreqs; + int status; dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen); @@ -1047,9 +1047,6 @@ void xprt_transmit(struct rpc_task *task) xprt->ops->set_retrans_timeout(task); - numreqs = atomic_read(&xprt->num_reqs); - if (numreqs > xprt->stat.max_slots) - xprt->stat.max_slots = numreqs; xprt->stat.sends++; xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs; xprt->stat.bklog_u += xprt->backlog.qlen; @@ -1111,14 +1108,15 @@ static struct rpc_rqst *xprt_dynamic_alloc_slot(struct rpc_xprt *xprt) { struct rpc_rqst *req = ERR_PTR(-EAGAIN); - if (!atomic_add_unless(&xprt->num_reqs, 1, xprt->max_reqs)) + if (xprt->num_reqs >= xprt->max_reqs) goto out; + ++xprt->num_reqs; spin_unlock(&xprt->reserve_lock); req = kzalloc(sizeof(struct rpc_rqst), GFP_NOFS); spin_lock(&xprt->reserve_lock); if (req != NULL) goto out; - atomic_dec(&xprt->num_reqs); + --xprt->num_reqs; req = ERR_PTR(-ENOMEM); out: return req; @@ -1126,7 +1124,8 @@ out: static bool xprt_dynamic_free_slot(struct rpc_xprt *xprt, struct rpc_rqst *req) { - if (atomic_add_unless(&xprt->num_reqs, -1, xprt->min_reqs)) { + if (xprt->num_reqs > xprt->min_reqs) { + --xprt->num_reqs; kfree(req); return true; } @@ -1162,6 +1161,8 @@ void xprt_alloc_slot(struct rpc_xprt *xprt, struct rpc_task *task) spin_unlock(&xprt->reserve_lock); return; out_init_req: + xprt->stat.max_slots = max_t(unsigned int, xprt->stat.max_slots, + xprt->num_reqs); task->tk_status = 0; task->tk_rqstp = req; xprt_request_init(task, xprt); @@ -1229,7 +1230,7 @@ struct rpc_xprt *xprt_alloc(struct net *net, size_t size, else xprt->max_reqs = num_prealloc; xprt->min_reqs = num_prealloc; - atomic_set(&xprt->num_reqs, num_prealloc); + xprt->num_reqs = num_prealloc; return xprt; |