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>
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Andy Grover
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David S. Miller
David S. Miller
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0fbc78cbf5
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148
net/rds/stats.c
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148
net/rds/stats.c
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/*
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* Copyright (c) 2006 Oracle. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/percpu.h>
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#include <linux/seq_file.h>
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#include <linux/proc_fs.h>
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#include "rds.h"
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DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats);
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/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */
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static char *rds_stat_names[] = {
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"conn_reset",
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"recv_drop_bad_checksum",
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"recv_drop_old_seq",
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"recv_drop_no_sock",
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"recv_drop_dead_sock",
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"recv_deliver_raced",
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"recv_delivered",
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"recv_queued",
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"recv_immediate_retry",
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"recv_delayed_retry",
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"recv_ack_required",
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"recv_rdma_bytes",
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"recv_ping",
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"send_queue_empty",
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"send_queue_full",
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"send_sem_contention",
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"send_sem_queue_raced",
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"send_immediate_retry",
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"send_delayed_retry",
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"send_drop_acked",
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"send_ack_required",
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"send_queued",
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"send_rdma",
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"send_rdma_bytes",
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"send_pong",
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"page_remainder_hit",
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"page_remainder_miss",
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"copy_to_user",
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"copy_from_user",
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"cong_update_queued",
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"cong_update_received",
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"cong_send_error",
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"cong_send_blocked",
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};
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void rds_stats_info_copy(struct rds_info_iterator *iter,
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uint64_t *values, char **names, size_t nr)
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{
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struct rds_info_counter ctr;
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size_t i;
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for (i = 0; i < nr; i++) {
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BUG_ON(strlen(names[i]) >= sizeof(ctr.name));
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strncpy(ctr.name, names[i], sizeof(ctr.name) - 1);
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ctr.value = values[i];
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rds_info_copy(iter, &ctr, sizeof(ctr));
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}
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}
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/*
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* This gives global counters across all the transports. The strings
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* are copied in so that the tool doesn't need knowledge of the specific
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* stats that we're exporting. Some are pretty implementation dependent
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* and may change over time. That doesn't stop them from being useful.
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*
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* This is the only function in the chain that knows about the byte granular
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* length in userspace. It converts it to number of stat entries that the
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* rest of the functions operate in.
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*/
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static void rds_stats_info(struct socket *sock, unsigned int len,
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struct rds_info_iterator *iter,
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struct rds_info_lengths *lens)
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{
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struct rds_statistics stats = {0, };
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uint64_t *src;
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uint64_t *sum;
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size_t i;
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int cpu;
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unsigned int avail;
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avail = len / sizeof(struct rds_info_counter);
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if (avail < ARRAY_SIZE(rds_stat_names)) {
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avail = 0;
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goto trans;
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}
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for_each_online_cpu(cpu) {
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src = (uint64_t *)&(per_cpu(rds_stats, cpu));
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sum = (uint64_t *)&stats;
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for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
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*(sum++) += *(src++);
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}
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rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names,
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ARRAY_SIZE(rds_stat_names));
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avail -= ARRAY_SIZE(rds_stat_names);
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trans:
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lens->each = sizeof(struct rds_info_counter);
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lens->nr = rds_trans_stats_info_copy(iter, avail) +
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ARRAY_SIZE(rds_stat_names);
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}
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void rds_stats_exit(void)
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{
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rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info);
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}
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int __init rds_stats_init(void)
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{
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rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info);
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return 0;
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}
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