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Diffstat (limited to '')
| -rw-r--r-- | net/rds/stats.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/net/rds/stats.c b/net/rds/stats.c new file mode 100644 index 000000000..6bbab4d74 --- /dev/null +++ b/net/rds/stats.c @@ -0,0 +1,154 @@ +/* + * Copyright (c) 2006 Oracle. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ +#include <linux/percpu.h> +#include <linux/seq_file.h> +#include <linux/proc_fs.h> +#include <linux/export.h> + +#include "rds.h" + +DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_statistics, rds_stats); +EXPORT_PER_CPU_SYMBOL_GPL(rds_stats); + +/* :.,$s/unsigned long\>.*\<s_\(.*\);/"\1",/g */ + +static const char *const rds_stat_names[] = { + "conn_reset", + "recv_drop_bad_checksum", + "recv_drop_old_seq", + "recv_drop_no_sock", + "recv_drop_dead_sock", + "recv_deliver_raced", + "recv_delivered", + "recv_queued", + "recv_immediate_retry", + "recv_delayed_retry", + "recv_ack_required", + "recv_rdma_bytes", + "recv_ping", + "send_queue_empty", + "send_queue_full", + "send_lock_contention", + "send_lock_queue_raced", + "send_immediate_retry", + "send_delayed_retry", + "send_drop_acked", + "send_ack_required", + "send_queued", + "send_rdma", + "send_rdma_bytes", + "send_pong", + "page_remainder_hit", + "page_remainder_miss", + "copy_to_user", + "copy_from_user", + "cong_update_queued", + "cong_update_received", + "cong_send_error", + "cong_send_blocked", + "recv_bytes_added_to_sock", + "recv_bytes_freed_fromsock", +}; + +void rds_stats_info_copy(struct rds_info_iterator *iter, + uint64_t *values, const char *const *names, size_t nr) +{ + struct rds_info_counter ctr; + size_t i; + + for (i = 0; i < nr; i++) { + BUG_ON(strlen(names[i]) >= sizeof(ctr.name)); + strncpy(ctr.name, names[i], sizeof(ctr.name) - 1); + ctr.name[sizeof(ctr.name) - 1] = '\0'; + ctr.value = values[i]; + + rds_info_copy(iter, &ctr, sizeof(ctr)); + } +} +EXPORT_SYMBOL_GPL(rds_stats_info_copy); + +/* + * This gives global counters across all the transports. The strings + * are copied in so that the tool doesn't need knowledge of the specific + * stats that we're exporting. Some are pretty implementation dependent + * and may change over time. That doesn't stop them from being useful. + * + * This is the only function in the chain that knows about the byte granular + * length in userspace. It converts it to number of stat entries that the + * rest of the functions operate in. + */ +static void rds_stats_info(struct socket *sock, unsigned int len, + struct rds_info_iterator *iter, + struct rds_info_lengths *lens) +{ + struct rds_statistics stats = {0, }; + uint64_t *src; + uint64_t *sum; + size_t i; + int cpu; + unsigned int avail; + + avail = len / sizeof(struct rds_info_counter); + + if (avail < ARRAY_SIZE(rds_stat_names)) { + avail = 0; + goto trans; + } + + for_each_online_cpu(cpu) { + src = (uint64_t *)&(per_cpu(rds_stats, cpu)); + sum = (uint64_t *)&stats; + for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++) + *(sum++) += *(src++); + } + + rds_stats_info_copy(iter, (uint64_t *)&stats, rds_stat_names, + ARRAY_SIZE(rds_stat_names)); + avail -= ARRAY_SIZE(rds_stat_names); + +trans: + lens->each = sizeof(struct rds_info_counter); + lens->nr = rds_trans_stats_info_copy(iter, avail) + + ARRAY_SIZE(rds_stat_names); +} + +void rds_stats_exit(void) +{ + rds_info_deregister_func(RDS_INFO_COUNTERS, rds_stats_info); +} + +int rds_stats_init(void) +{ + rds_info_register_func(RDS_INFO_COUNTERS, rds_stats_info); + return 0; +} |