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SUNRPC: Replace division by multiplication in calculation of queue length

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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 <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-07-15 15:12:08 -04:00
parent 50c8000744
commit 3cf7292280
1 changed files with 2 additions and 3 deletions
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5
net/sunrpc/xprtmultipath.c
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@ -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;
}