This introduces set of functions used on client side to account statistics of RDMA data sent/received, amount of IOs inflight, latency, cpu migrations, etc. Almost all statistics is collected using percpu variables.
Signed-off-by: Roman Pen <roman.peny...@profitbricks.com> Signed-off-by: Danil Kipnis <danil.kip...@profitbricks.com> Cc: Jack Wang <jinpu.w...@profitbricks.com> --- drivers/infiniband/ulp/ibtrs/ibtrs-clt-stats.c | 455 +++++++++++++++++++++++++ 1 file changed, 455 insertions(+) diff --git a/drivers/infiniband/ulp/ibtrs/ibtrs-clt-stats.c b/drivers/infiniband/ulp/ibtrs/ibtrs-clt-stats.c new file mode 100644 index 000000000000..af2ed05d2900 --- /dev/null +++ b/drivers/infiniband/ulp/ibtrs/ibtrs-clt-stats.c @@ -0,0 +1,455 @@ +/* + * InfiniBand Transport Layer + * + * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved. + * Authors: Fabian Holler <m...@fholler.de> + * Jack Wang <jinpu.w...@profitbricks.com> + * Kleber Souza <kleber.so...@profitbricks.com> + * Danil Kipnis <danil.kip...@profitbricks.com> + * Roman Penyaev <roman.peny...@profitbricks.com> + * Milind Dumbare <milind.dumb...@gmail.com> + * + * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved. + * Authors: Danil Kipnis <danil.kip...@profitbricks.com> + * Roman Penyaev <roman.peny...@profitbricks.com> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#undef pr_fmt +#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt + +#include "ibtrs-clt.h" + +static inline int ibtrs_clt_ms_to_id(unsigned long ms) +{ + int id = ms ? ilog2(ms) - MIN_LOG_LAT + 1 : 0; + + return clamp(id, 0, LOG_LAT_SZ - 1); +} + +void ibtrs_clt_update_rdma_lat(struct ibtrs_clt_stats *stats, bool read, + unsigned long ms) +{ + struct ibtrs_clt_stats_pcpu *s; + int id; + + id = ibtrs_clt_ms_to_id(ms); + s = this_cpu_ptr(stats->pcpu_stats); + if (read) { + s->rdma_lat_distr[id].read++; + if (s->rdma_lat_max.read < ms) + s->rdma_lat_max.read = ms; + } else { + s->rdma_lat_distr[id].write++; + if (s->rdma_lat_max.write < ms) + s->rdma_lat_max.write = ms; + } +} + +void ibtrs_clt_decrease_inflight(struct ibtrs_clt_stats *stats) +{ + atomic_dec(&stats->inflight); +} + +void ibtrs_clt_update_wc_stats(struct ibtrs_clt_con *con) +{ + struct ibtrs_clt_sess *sess = to_clt_sess(con->c.sess); + struct ibtrs_clt_stats *stats = &sess->stats; + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + cpu = raw_smp_processor_id(); + s = this_cpu_ptr(stats->pcpu_stats); + s->wc_comp.cnt++; + s->wc_comp.total_cnt++; + if (unlikely(con->cpu != cpu)) { + s->cpu_migr.to++; + + /* Careful here, override s pointer */ + s = per_cpu_ptr(stats->pcpu_stats, con->cpu); + atomic_inc(&s->cpu_migr.from); + } +} + +void ibtrs_clt_inc_failover_cnt(struct ibtrs_clt_stats *stats) +{ + struct ibtrs_clt_stats_pcpu *s; + + s = this_cpu_ptr(stats->pcpu_stats); + s->rdma.failover_cnt++; +} + +static inline u32 ibtrs_clt_stats_get_avg_wc_cnt(struct ibtrs_clt_stats *stats) +{ + u32 cnt = 0; + u64 sum = 0; + int cpu; + + for_each_possible_cpu(cpu) { + struct ibtrs_clt_stats_pcpu *s; + + s = per_cpu_ptr(stats->pcpu_stats, cpu); + sum += s->wc_comp.total_cnt; + cnt += s->wc_comp.cnt; + } + + return cnt ? sum / cnt : 0; +} + +int ibtrs_clt_stats_wc_completion_to_str(struct ibtrs_clt_stats *stats, + char *buf, size_t len) +{ + return scnprintf(buf, len, "%u\n", + ibtrs_clt_stats_get_avg_wc_cnt(stats)); +} + +ssize_t ibtrs_clt_stats_rdma_lat_distr_to_str(struct ibtrs_clt_stats *stats, + char *page, size_t len) +{ + struct ibtrs_clt_stats_rdma_lat res[LOG_LAT_SZ]; + struct ibtrs_clt_stats_rdma_lat max; + struct ibtrs_clt_stats_pcpu *s; + + ssize_t cnt = 0; + int i, cpu; + + max.write = 0; + max.read = 0; + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + + if (max.write < s->rdma_lat_max.write) + max.write = s->rdma_lat_max.write; + if (max.read < s->rdma_lat_max.read) + max.read = s->rdma_lat_max.read; + } + for (i = 0; i < ARRAY_SIZE(res); i++) { + res[i].write = 0; + res[i].read = 0; + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + + res[i].write += s->rdma_lat_distr[i].write; + res[i].read += s->rdma_lat_distr[i].read; + } + } + + for (i = 0; i < ARRAY_SIZE(res) - 1; i++) + cnt += scnprintf(page + cnt, len - cnt, + "< %6d ms: %llu %llu\n", + 1 << (i + MIN_LOG_LAT), res[i].read, + res[i].write); + cnt += scnprintf(page + cnt, len - cnt, ">= %5d ms: %llu %llu\n", + 1 << (i - 1 + MIN_LOG_LAT), res[i].read, + res[i].write); + cnt += scnprintf(page + cnt, len - cnt, " maximum ms: %llu %llu\n", + max.read, max.write); + + return cnt; +} + +int ibtrs_clt_stats_migration_cnt_to_str(struct ibtrs_clt_stats *stats, + char *buf, size_t len) +{ + struct ibtrs_clt_stats_pcpu *s; + + size_t used; + int cpu; + + used = scnprintf(buf, len, " "); + for_each_possible_cpu(cpu) + used += scnprintf(buf + used, len - used, " CPU%u", cpu); + + used += scnprintf(buf + used, len - used, "\nfrom:"); + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + used += scnprintf(buf + used, len - used, " %d", + atomic_read(&s->cpu_migr.from)); + } + + used += scnprintf(buf + used, len - used, "\nto :"); + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + used += scnprintf(buf + used, len - used, " %d", + s->cpu_migr.to); + } + used += scnprintf(buf + used, len - used, "\n"); + + return used; +} + +int ibtrs_clt_stats_reconnects_to_str(struct ibtrs_clt_stats *stats, char *buf, + size_t len) +{ + return scnprintf(buf, len, "%d %d\n", + stats->reconnects.successful_cnt, + stats->reconnects.fail_cnt); +} + +ssize_t ibtrs_clt_stats_rdma_to_str(struct ibtrs_clt_stats *stats, + char *page, size_t len) +{ + struct ibtrs_clt_stats_rdma sum; + struct ibtrs_clt_stats_rdma *r; + int cpu; + + memset(&sum, 0, sizeof(sum)); + + for_each_possible_cpu(cpu) { + r = &per_cpu_ptr(stats->pcpu_stats, cpu)->rdma; + + sum.dir[READ].cnt += r->dir[READ].cnt; + sum.dir[READ].size_total += r->dir[READ].size_total; + sum.dir[WRITE].cnt += r->dir[WRITE].cnt; + sum.dir[WRITE].size_total += r->dir[WRITE].size_total; + sum.failover_cnt += r->failover_cnt; + } + + return scnprintf(page, len, "%llu %llu %llu %llu %u %llu\n", + sum.dir[READ].cnt, sum.dir[READ].size_total, + sum.dir[WRITE].cnt, sum.dir[WRITE].size_total, + atomic_read(&stats->inflight), sum.failover_cnt); +} + +int ibtrs_clt_stats_sg_list_distr_to_str(struct ibtrs_clt_stats *stats, + char *buf, size_t len) +{ + struct ibtrs_clt_stats_pcpu *s; + + int i, cpu, cnt; + + cnt = scnprintf(buf, len, "n\\cpu:"); + for_each_possible_cpu(cpu) + cnt += scnprintf(buf + cnt, len - cnt, "%5d", cpu); + + for (i = 0; i < SG_DISTR_SZ; i++) { + if (i <= MAX_LIN_SG) + cnt += scnprintf(buf + cnt, len - cnt, "\n= %3d:", i); + else if (i < SG_DISTR_SZ - 1) + cnt += scnprintf(buf + cnt, len - cnt, + "\n< %3d:", + 1 << (i + MIN_LOG_SG - MAX_LIN_SG)); + else + cnt += scnprintf(buf + cnt, len - cnt, + "\n>=%3d:", + 1 << (i + MIN_LOG_SG - MAX_LIN_SG - 1)); + + for_each_possible_cpu(cpu) { + unsigned int p, p_i, p_f; + u64 total, distr; + + s = per_cpu_ptr(stats->pcpu_stats, cpu); + total = s->sg_list_total; + distr = s->sg_list_distr[i]; + + p = total ? distr * 1000 / total : 0; + p_i = p / 10; + p_f = p % 10; + + if (distr) + cnt += scnprintf(buf + cnt, len - cnt, + " %2u.%01u", p_i, p_f); + else + cnt += scnprintf(buf + cnt, len - cnt, " 0"); + } + } + + cnt += scnprintf(buf + cnt, len - cnt, "\ntotal:"); + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + cnt += scnprintf(buf + cnt, len - cnt, " %llu", + s->sg_list_total); + } + cnt += scnprintf(buf + cnt, len - cnt, "\n"); + + return cnt; +} + +ssize_t ibtrs_clt_reset_all_help(struct ibtrs_clt_stats *s, + char *page, size_t len) +{ + return scnprintf(page, len, "echo 1 to reset all statistics\n"); +} + +int ibtrs_clt_reset_rdma_stats(struct ibtrs_clt_stats *stats, bool enable) +{ + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + if (unlikely(!enable)) + return -EINVAL; + + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + memset(&s->rdma, 0, sizeof(s->rdma)); + } + + return 0; +} + +int ibtrs_clt_reset_rdma_lat_distr_stats(struct ibtrs_clt_stats *stats, + bool enable) +{ + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + if (enable) { + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + memset(&s->rdma_lat_max, 0, sizeof(s->rdma_lat_max)); + memset(&s->rdma_lat_distr, 0, + sizeof(s->rdma_lat_distr)); + } + } + stats->enable_rdma_lat = enable; + + return 0; +} + +int ibtrs_clt_reset_sg_list_distr_stats(struct ibtrs_clt_stats *stats, + bool enable) +{ + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + if (unlikely(!enable)) + return -EINVAL; + + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + memset(&s->sg_list_total, 0, sizeof(s->sg_list_total)); + memset(&s->sg_list_distr, 0, sizeof(s->sg_list_distr)); + } + + return 0; +} + +int ibtrs_clt_reset_cpu_migr_stats(struct ibtrs_clt_stats *stats, bool enable) +{ + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + if (unlikely(!enable)) + return -EINVAL; + + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + memset(&s->cpu_migr, 0, sizeof(s->cpu_migr)); + } + + return 0; +} + +int ibtrs_clt_reset_reconnects_stat(struct ibtrs_clt_stats *stats, bool enable) +{ + if (unlikely(!enable)) + return -EINVAL; + + memset(&stats->reconnects, 0, sizeof(stats->reconnects)); + + return 0; +} + +int ibtrs_clt_reset_wc_comp_stats(struct ibtrs_clt_stats *stats, bool enable) +{ + struct ibtrs_clt_stats_pcpu *s; + int cpu; + + if (unlikely(!enable)) + return -EINVAL; + + for_each_possible_cpu(cpu) { + s = per_cpu_ptr(stats->pcpu_stats, cpu); + memset(&s->wc_comp, 0, sizeof(s->wc_comp)); + } + + return 0; +} + +int ibtrs_clt_reset_all_stats(struct ibtrs_clt_stats *s, bool enable) +{ + if (enable) { + ibtrs_clt_reset_rdma_stats(s, enable); + ibtrs_clt_reset_rdma_lat_distr_stats(s, enable); + ibtrs_clt_reset_sg_list_distr_stats(s, enable); + ibtrs_clt_reset_cpu_migr_stats(s, enable); + ibtrs_clt_reset_reconnects_stat(s, enable); + ibtrs_clt_reset_wc_comp_stats(s, enable); + atomic_set(&s->inflight, 0); + return 0; + } + + return -EINVAL; +} + +static inline void ibtrs_clt_record_sg_distr(u64 stat[SG_DISTR_SZ], u64 *total, + unsigned int cnt) +{ + int i; + + i = cnt > MAX_LIN_SG ? ilog2(cnt) + MAX_LIN_SG - MIN_LOG_SG + 1 : cnt; + i = i < SG_DISTR_SZ ? i : SG_DISTR_SZ - 1; + + stat[i]++; + (*total)++; +} + +static inline void ibtrs_clt_update_rdma_stats(struct ibtrs_clt_stats *stats, + size_t size, int d) +{ + struct ibtrs_clt_stats_pcpu *s; + + s = this_cpu_ptr(stats->pcpu_stats); + s->rdma.dir[d].cnt++; + s->rdma.dir[d].size_total += size; +} + +void ibtrs_clt_update_all_stats(struct ibtrs_clt_io_req *req, int dir) +{ + struct ibtrs_clt_con *con = req->con; + struct ibtrs_clt_sess *sess = to_clt_sess(con->c.sess); + struct ibtrs_clt_stats *stats = &sess->stats; + unsigned int len; + + struct ibtrs_clt_stats_pcpu *s; + + s = this_cpu_ptr(stats->pcpu_stats); + ibtrs_clt_record_sg_distr(s->sg_list_distr, &s->sg_list_total, + req->sg_cnt); + len = req->usr_len + req->data_len; + ibtrs_clt_update_rdma_stats(stats, len, dir); + atomic_inc(&stats->inflight); +} + +int ibtrs_clt_init_stats(struct ibtrs_clt_stats *stats) +{ + stats->enable_rdma_lat = false; + stats->pcpu_stats = alloc_percpu(typeof(*stats->pcpu_stats)); + if (unlikely(!stats->pcpu_stats)) + return -ENOMEM; + + /* + * successful_cnt will be set to 0 after session + * is established for the first time + */ + stats->reconnects.successful_cnt = -1; + + return 0; +} + +void ibtrs_clt_free_stats(struct ibtrs_clt_stats *stats) +{ + free_percpu(stats->pcpu_stats); +} -- 2.13.1
