SUNRPC: switchable buffer allocation

 Add RPC client transport switch support for replacing buffer management
 on a per-transport basis.

 In the current IPv4 socket transport implementation, RPC buffers are
 allocated as needed for each RPC message that is sent.  Some transport
 implementations may choose to use pre-allocated buffers for encoding,
 sending, receiving, and unmarshalling RPC messages, however.  For
 transports capable of direct data placement, the buffers can be carved
 out of a pre-registered area of memory rather than from a slab cache.

 Test-plan:
 Millions of fsx operations.  Performance characterization with "sio" and
 "iozone".  Use oprofile and other tools to look for significant regression
 in CPU utilization.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
index 94b0afa4ab05..8b25629accd8 100644
--- a/include/linux/sunrpc/sched.h
+++ b/include/linux/sunrpc/sched.h
@@ -52,8 +52,6 @@ struct rpc_task {
          * RPC call state
          */
         struct rpc_message      tk_msg;         /* RPC call info */
-        __u32 *                 tk_buffer;      /* XDR buffer */
-        size_t                  tk_bufsize;
         __u8                    tk_garb_retry;
         __u8                    tk_cred_retry;
 
@@ -268,6 +266,7 @@ struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
 void            rpc_wake_up_status(struct rpc_wait_queue *, int);
 void            rpc_delay(struct rpc_task *, unsigned long);
 void *          rpc_malloc(struct rpc_task *, size_t);
+void            rpc_free(struct rpc_task *);
 int             rpciod_up(void);
 void            rpciod_down(void);
 void            rpciod_wake_up(void);