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authorAndy Grover <andy.grover@oracle.com>2009-02-24 10:30:22 -0500
committerDavid S. Miller <davem@davemloft.net>2009-02-27 02:39:25 -0500
commita8c879a7ee988eb67a5e85e87fa2cc953e0ca749 (patch)
tree493db4a3137d9f7bd1fe871ace4f5e12c1fbb2a1 /net/rds/stats.c
parent0fbc78cbf51f3edee17c2ede42c7b3c13736158a (diff)
RDS: Info and stats
RDS currently generates a lot of stats that are accessible via the rds-info utility. This code implements the support for this. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/stats.c')
-rw-r--r--net/rds/stats.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/net/rds/stats.c b/net/rds/stats.c
new file mode 100644
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+++ b/net/rds/stats.c
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1/*
2 * Copyright (c) 2006 Oracle. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 *
32 */
33#include <linux/percpu.h>
34#include <linux/seq_file.h>
35#include <linux/proc_fs.h>
36
37#include "rds.h"
38
39DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
40
41/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
42
43static char *rds_stat_names[] = {
44 "conn_reset",
45 "recv_drop_bad_checksum",
46 "recv_drop_old_seq",
47 "recv_drop_no_sock",
48 "recv_drop_dead_sock",
49 "recv_deliver_raced",
50 "recv_delivered",
51 "recv_queued",
52 "recv_immediate_retry",
53 "recv_delayed_retry",
54 "recv_ack_required",
55 "recv_rdma_bytes",
56 "recv_ping",
57 "send_queue_empty",
58 "send_queue_full",
59 "send_sem_contention",
60 "send_sem_queue_raced",
61 "send_immediate_retry",
62 "send_delayed_retry",
63 "send_drop_acked",
64 "send_ack_required",
65 "send_queued",
66 "send_rdma",
67 "send_rdma_bytes",
68 "send_pong",
69 "page_remainder_hit",
70 "page_remainder_miss",
71 "copy_to_user",
72 "copy_from_user",
73 "cong_update_queued",
74 "cong_update_received",
75 "cong_send_error",
76 "cong_send_blocked",
77};
78
79void rds_stats_info_copy(struct rds_info_iterator *iter,
80 uint64_t *values, char **names, size_t nr)
81{
82 struct rds_info_counter ctr;
83 size_t i;
84
85 for (i = 0; i < nr; i++) {
86 BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
87 strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
88 ctr.value = values[i];
89
90 rds_info_copy(iter, &ctr, sizeof(ctr));
91 }
92}
93
94/*
95 * This gives global counters across all the transports. The strings
96 * are copied in so that the tool doesn't need knowledge of the specific
97 * stats that we're exporting. Some are pretty implementation dependent
98 * and may change over time. That doesn't stop them from being useful.
99 *
100 * This is the only function in the chain that knows about the byte granular
101 * length in userspace. It converts it to number of stat entries that the
102 * rest of the functions operate in.
103 */
104static void rds_stats_info(struct socket *sock, unsigned int len,
105 struct rds_info_iterator *iter,
106 struct rds_info_lengths *lens)
107{
108 struct rds_statistics stats = {0, };
109 uint64_t *src;
110 uint64_t *sum;
111 size_t i;
112 int cpu;
113 unsigned int avail;
114
115 avail = len / sizeof(struct rds_info_counter);
116
117 if (avail < ARRAY_SIZE(rds_stat_names)) {
118 avail = 0;
119 goto trans;
120 }
121
122 for_each_online_cpu(cpu) {
123 src = (uint64_t *)&(per_cpu(rds_stats, cpu));
124 sum = (uint64_t *)&stats;
125 for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
126 *(sum++) += *(src++);
127 }
128
129 rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
130 ARRAY_SIZE(rds_stat_names));
131 avail -= ARRAY_SIZE(rds_stat_names);
132
133trans:
134 lens->each = sizeof(struct rds_info_counter);
135 lens->nr = rds_trans_stats_info_copy(iter, avail) +
136 ARRAY_SIZE(rds_stat_names);
137}
138
139void rds_stats_exit(void)
140{
141 rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
142}
143
144int __init rds_stats_init(void)
145{
146 rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
147 return 0;
148}