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SUNRPC: add sending,pending queue and max slot to xprt stats 

With static RPC slots, the xprt backlog queue stats were useful in showing
when the transport (TCP) was starved by lack of RPC slots. The new dynamic
RPC slot code, commit d9ba131d8f, always
provides an RPC slot and so only uses the xprt backlog queue when the
tcp_max_slot_table_entries value has been hit or when an allocation error
occurs. All requests are now placed on the xprt sending or pending queue which
need to be monitored for debugging.

The max_slot stat shows the maximum number of dynamic RPC slots reached which is
useful when debugging performance issues.

Add the new fields at the end of the mountstats xprt stanza so that mountstats
outputs the previous correct values and ignores the new fields. Bump
NFS_IOSTATS_VERS.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
hifive-unleashed-5.1
Andy Adamson 2012-02-14 16:19:18 -05:00 committed by Trond Myklebust
parent 1d96e80faf
commit 15a4520621
4 changed files with 29 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/nfs_iostat.h
View File

@ -21,7 +21,7 @@
#ifndef _LINUX_NFS_IOSTAT
#define _LINUX_NFS_IOSTAT
#define NFS_IOSTAT_VERS "1.0"
#define NFS_IOSTAT_VERS "1.1"
/*
* NFS byte counters

7
include/linux/sunrpc/xprt.h
View File

@ -219,10 +219,13 @@ struct rpc_xprt {
connect_time, /* jiffies waiting for connect */
sends, /* how many complete requests */
recvs, /* how many complete requests */
bad_xids; /* lookup_rqst didn't find XID */
bad_xids, /* lookup_rqst didn't find XID */
max_slots; /* max rpc_slots used */
unsigned long long req_u, /* average requests on the wire */
bklog_u; /* backlog queue utilization */
bklog_u, /* backlog queue utilization */
sending_u, /* send q utilization */
pending_u; /* pend q utilization */
} stat;
struct net *xprt_net;

7
net/sunrpc/xprt.c
View File

@ -885,7 +885,7 @@ void xprt_transmit(struct rpc_task *task)
{
struct rpc_rqst *req = task->tk_rqstp;
struct rpc_xprt *xprt = req->rq_xprt;
int status;
int status, numreqs;
dprintk("RPC: %5u xprt_transmit(%u)\n", task->tk_pid, req->rq_slen);
@ -922,9 +922,14 @@ void xprt_transmit(struct rpc_task *task)
xprt->ops->set_retrans_timeout(task);
numreqs = atomic_read(&xprt->num_reqs);
if (numreqs > xprt->stat.max_slots)
xprt->stat.max_slots = numreqs;
xprt->stat.sends++;
xprt->stat.req_u += xprt->stat.sends - xprt->stat.recvs;
xprt->stat.bklog_u += xprt->backlog.qlen;
xprt->stat.sending_u += xprt->sending.qlen;
xprt->stat.pending_u += xprt->pending.qlen;
/* Don't race with disconnect */
if (!xprt_connected(xprt))

23
net/sunrpc/xprtsock.c
View File

@ -2227,7 +2227,7 @@ static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
idle_time = (long)(jiffies - xprt->last_used) / HZ;
seq_printf(seq, "\txprt:\tlocal %lu %lu %lu %ld %lu %lu %lu "
"%llu %llu\n",
"%llu %llu %lu %llu %llu\n",
xprt->stat.bind_count,
xprt->stat.connect_count,
xprt->stat.connect_time,
@ -2236,7 +2236,10 @@ static void xs_local_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
xprt->stat.recvs,
xprt->stat.bad_xids,
xprt->stat.req_u,
xprt->stat.bklog_u);
xprt->stat.bklog_u,
xprt->stat.max_slots,
xprt->stat.sending_u,
xprt->stat.pending_u);
}
/**
@ -2249,14 +2252,18 @@ static void xs_udp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
{
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %Lu %Lu\n",
seq_printf(seq, "\txprt:\tudp %u %lu %lu %lu %lu %llu %llu "
"%lu %llu %llu\n",
transport->srcport,
xprt->stat.bind_count,
xprt->stat.sends,
xprt->stat.recvs,
xprt->stat.bad_xids,
xprt->stat.req_u,
xprt->stat.bklog_u);
xprt->stat.bklog_u,
xprt->stat.max_slots,
xprt->stat.sending_u,
xprt->stat.pending_u);
}
/**
@ -2273,7 +2280,8 @@ static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
if (xprt_connected(xprt))
idle_time = (long)(jiffies - xprt->last_used) / HZ;
seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu %Lu %Lu\n",
seq_printf(seq, "\txprt:\ttcp %u %lu %lu %lu %ld %lu %lu %lu "
"%llu %llu %lu %llu %llu\n",
transport->srcport,
xprt->stat.bind_count,
xprt->stat.connect_count,
@ -2283,7 +2291,10 @@ static void xs_tcp_print_stats(struct rpc_xprt *xprt, struct seq_file *seq)
xprt->stat.recvs,
xprt->stat.bad_xids,
xprt->stat.req_u,
xprt->stat.bklog_u);
xprt->stat.bklog_u,
xprt->stat.max_slots,
xprt->stat.sending_u,
xprt->stat.pending_u);
}
/*