From 3cf7292280d5e484747a5f0ee4b62327b037344c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 15 Jul 2019 15:12:08 -0400 Subject: [PATCH] SUNRPC: Replace division by multiplication in calculation of queue length When checking whether or not a particular xprt queue length is shorter than the average queue length for all xprts, prefer to use multiplication rather than division for performance reasons. Signed-off-by: Trond Myklebust --- net/sunrpc/xprtmultipath.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/net/sunrpc/xprtmultipath.c b/net/sunrpc/xprtmultipath.c index 9d66ce53355d..5df4e7adedf0 100644 --- a/net/sunrpc/xprtmultipath.c +++ b/net/sunrpc/xprtmultipath.c @@ -322,7 +322,6 @@ struct rpc_xprt *xprt_iter_next_entry_roundrobin(struct rpc_xprt_iter *xpi) struct rpc_xprt *xprt; unsigned long xprt_queuelen; unsigned long xps_queuelen; - unsigned long xps_avglen; do { xprt = xprt_iter_next_entry_multiple(xpi, @@ -333,8 +332,8 @@ struct rpc_xprt *xprt_iter_next_entry_roundrobin(struct rpc_xprt_iter *xpi) if (xprt_queuelen <= 2) break; xps_queuelen = atomic_long_read(&xps->xps_queuelen); - xps_avglen = DIV_ROUND_UP(xps_queuelen, xps->xps_nactive); - } while (xprt_queuelen > xps_avglen); + /* Exit loop if xprt_queuelen <= average queue length */ + } while (xprt_queuelen * READ_ONCE(xps->xps_nactive) > xps_queuelen); return xprt; } -- 2.30.2