[PATCH v6 07/25] rtrs: client: statistics functions

Jack Wang
2019-12-30T10:29:57Z

From: Jack Wang <jinpu.wang@cloud.ionos.com>

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: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
---
drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c | 435 +++++++++++++++++++
1 file changed, 435 insertions(+)
create mode 100644 drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c b/drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c
new file mode 100644
index 000000000000..aff8ebd3b9f7
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt-stats.c
@@ -0,0 +1,435 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ *
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ *
+ * Copyright (c) 2019 1&1 IONOS SE. All rights reserved.
+ */
+#undef pr_fmt
+#define pr_fmt(fmt) KBUILD_MODNAME " L" __stringify(__LINE__) ": " fmt
+
+#include "rtrs-clt.h"
+
+static inline int rtrs_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 rtrs_clt_update_rdma_lat(struct rtrs_clt_stats *stats, bool read,
+ unsigned long ms)
+{
+ struct rtrs_clt_stats_pcpu *s;
+ int id;
+
+ id = rtrs_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 rtrs_clt_decrease_inflight(struct rtrs_clt_stats *stats)
+{
+ atomic_dec(&stats->inflight);
+}
+
+void rtrs_clt_update_wc_stats(struct rtrs_clt_con *con)
+{
+ struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess);
+ struct rtrs_clt_stats *stats = &sess->stats;
+ struct rtrs_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 rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *stats)
+{
+ struct rtrs_clt_stats_pcpu *s;
+
+ s = this_cpu_ptr(stats->pcpu_stats);
+ s->rdma.failover_cnt++;
+}
+
+static inline u32 rtrs_clt_stats_get_avg_wc_cnt(struct rtrs_clt_stats *stats)
+{
+ u32 cnt = 0;
+ u64 sum = 0;
+ int cpu;
+
+ for_each_possible_cpu(cpu) {
+ struct rtrs_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 rtrs_clt_stats_wc_completion_to_str(struct rtrs_clt_stats *stats,
+ char *buf, size_t len)
+{
+ return scnprintf(buf, len, "%u\n",
+ rtrs_clt_stats_get_avg_wc_cnt(stats));
+}
+
+ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
+ char *page, size_t len)
+{
+ struct rtrs_clt_stats_rdma_lat res[LOG_LAT_SZ];
+ struct rtrs_clt_stats_rdma_lat max;
+ struct rtrs_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 rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats,
+ char *buf, size_t len)
+{
+ struct rtrs_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 rtrs_clt_stats_reconnects_to_str(struct rtrs_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 rtrs_clt_stats_rdma_to_str(struct rtrs_clt_stats *stats,
+ char *page, size_t len)
+{
+ struct rtrs_clt_stats_rdma sum;
+ struct rtrs_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 rtrs_clt_stats_sg_list_distr_to_str(struct rtrs_clt_stats *stats,
+ char *buf, size_t len)
+{
+ struct rtrs_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 rtrs_clt_reset_all_help(struct rtrs_clt_stats *s,
+ char *page, size_t len)
+{
+ return scnprintf(page, len, "echo 1 to reset all statistics\n");
+}
+
+int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable)
+{
+ struct rtrs_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 rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
+ bool enable)
+{
+ struct rtrs_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 rtrs_clt_reset_sg_list_distr_stats(struct rtrs_clt_stats *stats,
+ bool enable)
+{
+ struct rtrs_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 rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable)
+{
+ struct rtrs_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 rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable)
+{
+ if (unlikely(!enable))
+ return -EINVAL;
+
+ memset(&stats->reconnects, 0, sizeof(stats->reconnects));
+
+ return 0;
+}
+
+int rtrs_clt_reset_wc_comp_stats(struct rtrs_clt_stats *stats, bool enable)
+{
+ struct rtrs_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 rtrs_clt_reset_all_stats(struct rtrs_clt_stats *s, bool enable)
+{
+ if (enable) {
+ rtrs_clt_reset_rdma_stats(s, enable);
+ rtrs_clt_reset_rdma_lat_distr_stats(s, enable);
+ rtrs_clt_reset_sg_list_distr_stats(s, enable);
+ rtrs_clt_reset_cpu_migr_stats(s, enable);
+ rtrs_clt_reset_reconnects_stat(s, enable);
+ rtrs_clt_reset_wc_comp_stats(s, enable);
+ atomic_set(&s->inflight, 0);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+static inline void rtrs_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 rtrs_clt_update_rdma_stats(struct rtrs_clt_stats *stats,
+ size_t size, int d)
+{
+ struct rtrs_clt_stats_pcpu *s;
+
+ s = this_cpu_ptr(stats->pcpu_stats);
+ s->rdma.dir[d].cnt++;
+ s->rdma.dir[d].size_total += size;
+}
+
+void rtrs_clt_update_all_stats(struct rtrs_clt_io_req *req, int dir)
+{
+ struct rtrs_clt_con *con = req->con;
+ struct rtrs_clt_sess *sess = to_clt_sess(con->c.sess);
+ struct rtrs_clt_stats *stats = &sess->stats;
+ unsigned int len;
+
+ struct rtrs_clt_stats_pcpu *s;
+
+ s = this_cpu_ptr(stats->pcpu_stats);
+ rtrs_clt_record_sg_distr(s->sg_list_distr, &s->sg_list_total,
+ req->sg_cnt);
+ len = req->usr_len + req->data_len;
+ rtrs_clt_update_rdma_stats(stats, len, dir);
+ atomic_inc(&stats->inflight);
+}
+
+int rtrs_clt_init_stats(struct rtrs_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 rtrs_clt_free_stats(struct rtrs_clt_stats *stats)
+{
+ free_percpu(stats->pcpu_stats);
+}
--
2.17.1