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xprtrdma: Split rb_lock 

/proc/lock_stat showed contention between rpcrdma_buffer_get/put
and the MR allocation functions during I/O intensive workloads.

Now that MRs are no longer allocated in rpcrdma_buffer_get(),
there's no reason the rb_mws list has to be managed using the
same lock as the send/receive buffers. Split that lock. The
new lock does not need to disable interrupts because buffer
get/put is never called in an interrupt context.

struct rpcrdma_buffer is re-arranged to ensure rb_mwlock and rb_mws
are always in a different cacheline than rb_lock and the buffer
pointers.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Tested-By: Devesh Sharma <devesh.sharma@avagotech.com>
Reviewed-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2015-05-26 11:53:13 -04:00 committed by Anna Schumaker
parent 7e53df111b
commit 58d1dcf5a8
4 changed files with 15 additions and 13 deletions
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1
net/sunrpc/xprtrdma/fmr_ops.c
View File

@ -65,6 +65,7 @@ fmr_op_init(struct rpcrdma_xprt *r_xprt)
struct rpcrdma_mw *r;
int i, rc;
spin_lock_init(&buf->rb_mwlock);
INIT_LIST_HEAD(&buf->rb_mws);
INIT_LIST_HEAD(&buf->rb_all);

1
net/sunrpc/xprtrdma/frwr_ops.c
View File

@ -266,6 +266,7 @@ frwr_op_init(struct rpcrdma_xprt *r_xprt)
struct ib_pd *pd = r_xprt->rx_ia.ri_pd;
int i;
spin_lock_init(&buf->rb_mwlock);
INIT_LIST_HEAD(&buf->rb_mws);
INIT_LIST_HEAD(&buf->rb_all);

10
net/sunrpc/xprtrdma/verbs.c
View File

@ -1173,15 +1173,14 @@ rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
struct rpcrdma_mw *mw = NULL;
unsigned long flags;
spin_lock_irqsave(&buf->rb_lock, flags);
spin_lock(&buf->rb_mwlock);
if (!list_empty(&buf->rb_mws)) {
mw = list_first_entry(&buf->rb_mws,
struct rpcrdma_mw, mw_list);
list_del_init(&mw->mw_list);
}
spin_unlock_irqrestore(&buf->rb_lock, flags);
spin_unlock(&buf->rb_mwlock);
if (!mw)
pr_err("RPC: %s: no MWs available\n", __func__);
@ -1192,11 +1191,10 @@ void
rpcrdma_put_mw(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mw *mw)
{
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
unsigned long flags;
spin_lock_irqsave(&buf->rb_lock, flags);
spin_lock(&buf->rb_mwlock);
list_add_tail(&mw->mw_list, &buf->rb_mws);
spin_unlock_irqrestore(&buf->rb_lock, flags);
spin_unlock(&buf->rb_mwlock);
}
static void

16
net/sunrpc/xprtrdma/xprt_rdma.h
View File

@ -282,15 +282,17 @@ rpcr_to_rdmar(struct rpc_rqst *rqst)
* One of these is associated with a transport instance
*/
struct rpcrdma_buffer {
spinlock_t rb_lock; /* protects indexes */
u32 rb_max_requests;/* client max requests */
struct list_head rb_mws; /* optional memory windows/fmrs/frmrs */
struct list_head rb_all;
int rb_send_index;
spinlock_t rb_mwlock; /* protect rb_mws list */
struct list_head rb_mws;
struct list_head rb_all;
char *rb_pool;
spinlock_t rb_lock; /* protect buf arrays */
u32 rb_max_requests;
int rb_send_index;
int rb_recv_index;
struct rpcrdma_req **rb_send_bufs;
int rb_recv_index;
struct rpcrdma_rep **rb_recv_bufs;
char *rb_pool;
};
#define rdmab_to_ia(b) (&container_of((b), struct rpcrdma_xprt, rx_buf)->rx_ia)