SUNRPC: RPC buffer size estimates are too large
The RPC buffer size estimation logic in net/sunrpc/clnt.c always
significantly overestimates the requirements for the buffer size.
A little instrumentation demonstrated that in fact rpc_malloc was never
allocating the buffer from the mempool, but almost always called kmalloc.
To compute the size of the RPC buffer more precisely, split p_bufsiz into
two fields; one for the argument size, and one for the result size.
Then, compute the sum of the exact call and reply header sizes, and split
the RPC buffer precisely between the two. That should keep almost all RPC
buffers within the 2KiB buffer mempool limit.
And, we can finally be rid of RPC_SLACK_SPACE!
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 396cdbe..12487aa 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -36,8 +36,6 @@
#include <linux/sunrpc/metrics.h>
-#define RPC_SLACK_SPACE (1024) /* total overkill */
-
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_CALL
#endif
@@ -747,21 +745,37 @@
static void
call_allocate(struct rpc_task *task)
{
+ unsigned int slack = task->tk_auth->au_cslack;
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = task->tk_xprt;
- unsigned int bufsiz;
+ struct rpc_procinfo *proc = task->tk_msg.rpc_proc;
dprint_status(task);
+ task->tk_status = 0;
task->tk_action = call_bind;
+
if (req->rq_buffer)
return;
- /* FIXME: compute buffer requirements more exactly using
- * auth->au_wslack */
- bufsiz = task->tk_msg.rpc_proc->p_bufsiz + RPC_SLACK_SPACE;
+ if (proc->p_proc != 0) {
+ BUG_ON(proc->p_arglen == 0);
+ if (proc->p_decode != NULL)
+ BUG_ON(proc->p_replen == 0);
+ }
- if (xprt->ops->buf_alloc(task, bufsiz << 1) != NULL)
+ /*
+ * Calculate the size (in quads) of the RPC call
+ * and reply headers, and convert both values
+ * to byte sizes.
+ */
+ req->rq_callsize = RPC_CALLHDRSIZE + (slack << 1) + proc->p_arglen;
+ req->rq_callsize <<= 2;
+ req->rq_rcvsize = RPC_REPHDRSIZE + slack + proc->p_replen;
+ req->rq_rcvsize <<= 2;
+
+ xprt->ops->buf_alloc(task, req->rq_callsize + req->rq_rcvsize);
+ if (req->rq_buffer != NULL)
return;
dprintk("RPC: %5u rpc_buffer allocation failed\n", task->tk_pid);
@@ -788,6 +802,17 @@
task->tk_rqstp->rq_snd_buf.len = 0;
}
+static inline void
+rpc_xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
+{
+ buf->head[0].iov_base = start;
+ buf->head[0].iov_len = len;
+ buf->tail[0].iov_len = 0;
+ buf->page_len = 0;
+ buf->len = 0;
+ buf->buflen = len;
+}
+
/*
* 3. Encode arguments of an RPC call
*/
@@ -795,28 +820,17 @@
call_encode(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
- struct xdr_buf *sndbuf = &req->rq_snd_buf;
- struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
- unsigned int bufsiz;
kxdrproc_t encode;
__be32 *p;
dprint_status(task);
- /* Default buffer setup */
- bufsiz = req->rq_bufsize >> 1;
- sndbuf->head[0].iov_base = (void *)req->rq_buffer;
- sndbuf->head[0].iov_len = bufsiz;
- sndbuf->tail[0].iov_len = 0;
- sndbuf->page_len = 0;
- sndbuf->len = 0;
- sndbuf->buflen = bufsiz;
- rcvbuf->head[0].iov_base = (void *)((char *)req->rq_buffer + bufsiz);
- rcvbuf->head[0].iov_len = bufsiz;
- rcvbuf->tail[0].iov_len = 0;
- rcvbuf->page_len = 0;
- rcvbuf->len = 0;
- rcvbuf->buflen = bufsiz;
+ rpc_xdr_buf_init(&req->rq_snd_buf,
+ req->rq_buffer,
+ req->rq_callsize);
+ rpc_xdr_buf_init(&req->rq_rcv_buf,
+ (char *)req->rq_buffer + req->rq_callsize,
+ req->rq_rcvsize);
/* Encode header and provided arguments */
encode = task->tk_msg.rpc_proc->p_encode;