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xprtrdma: Saving IRQs no longer needed for rb_lock 

Now that RPC replies are processed in a workqueue, there's no need
to disable IRQs when managing send and receive buffers. This saves
noticeable overhead per RPC.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2015-10-24 17:27:27 -04:00 committed by Anna Schumaker
parent 2da9ab3008
commit a5b027e189
1 changed files with 10 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
net/sunrpc/xprtrdma/verbs.c
View File

@ -1063,24 +1063,23 @@ struct rpcrdma_req *
rpcrdma_buffer_get(struct rpcrdma_buffer *buffers)
{
struct rpcrdma_req *req;
unsigned long flags;
spin_lock_irqsave(&buffers->rb_lock, flags);
spin_lock(&buffers->rb_lock);
if (list_empty(&buffers->rb_send_bufs))
goto out_reqbuf;
req = rpcrdma_buffer_get_req_locked(buffers);
if (list_empty(&buffers->rb_recv_bufs))
goto out_repbuf;
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
return req;
out_reqbuf:
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
pr_warn("RPC: %s: out of request buffers\n", __func__);
return NULL;
out_repbuf:
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
pr_warn("RPC: %s: out of reply buffers\n", __func__);
req->rl_reply = NULL;
return req;
@ -1095,16 +1094,15 @@ rpcrdma_buffer_put(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
struct rpcrdma_rep *rep = req->rl_reply;
unsigned long flags;
req->rl_niovs = 0;
req->rl_reply = NULL;
spin_lock_irqsave(&buffers->rb_lock, flags);
spin_lock(&buffers->rb_lock);
list_add_tail(&req->rl_free, &buffers->rb_send_bufs);
if (rep)
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
}
/*
@ -1115,12 +1113,11 @@ void
rpcrdma_recv_buffer_get(struct rpcrdma_req *req)
{
struct rpcrdma_buffer *buffers = req->rl_buffer;
unsigned long flags;
spin_lock_irqsave(&buffers->rb_lock, flags);
spin_lock(&buffers->rb_lock);
if (!list_empty(&buffers->rb_recv_bufs))
req->rl_reply = rpcrdma_buffer_get_rep_locked(buffers);
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
}
/*
@ -1131,11 +1128,10 @@ void
rpcrdma_recv_buffer_put(struct rpcrdma_rep *rep)
{
struct rpcrdma_buffer *buffers = &rep->rr_rxprt->rx_buf;
unsigned long flags;
spin_lock_irqsave(&buffers->rb_lock, flags);
spin_lock(&buffers->rb_lock);
list_add_tail(&rep->rr_list, &buffers->rb_recv_bufs);
spin_unlock_irqrestore(&buffers->rb_lock, flags);
spin_unlock(&buffers->rb_lock);
}
/*