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SUNRPC: Add basic load balancing to the transport switch

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For now, just count the queue length. It is less accurate than counting
number of bytes queued, but easier to implement.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust
2017-04-28 10:52:42 -04:00
committed by Trond Myklebust
parent 44942b4e45
commit 21f0ffaff5
4 changed files with 59 additions and 4 deletions
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20
net/sunrpc/xprtmultipath.c
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@@ -36,6 +36,7 @@ static void xprt_switch_add_xprt_locked(struct rpc_xprt_switch *xps,
if (xps->xps_nxprts == 0)
xps->xps_net = xprt->xprt_net;
xps->xps_nxprts++;
xps->xps_nactive++;
}
/**
@@ -62,6 +63,7 @@ static void xprt_switch_remove_xprt_locked(struct rpc_xprt_switch *xps,
{
if (unlikely(xprt == NULL))
return;
xps->xps_nactive--;
xps->xps_nxprts--;
if (xps->xps_nxprts == 0)
xps->xps_net = NULL;
@@ -317,8 +319,24 @@ struct rpc_xprt *xprt_switch_find_next_entry_roundrobin(struct list_head *head,
static
struct rpc_xprt *xprt_iter_next_entry_roundrobin(struct rpc_xprt_iter *xpi)
{
return xprt_iter_next_entry_multiple(xpi,
struct rpc_xprt_switch *xps = rcu_dereference(xpi->xpi_xpswitch);
struct rpc_xprt *xprt;
unsigned long xprt_queuelen;
unsigned long xps_queuelen;
unsigned long xps_avglen;
do {
xprt = xprt_iter_next_entry_multiple(xpi,
xprt_switch_find_next_entry_roundrobin);
if (xprt == NULL)
break;
xprt_queuelen = atomic_long_read(&xprt->queuelen);
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);
return xprt;
}
static