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stat.c

#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <libgen.h>
#include <math.h>

#include "fio.h"
#include "diskutil.h"

void update_rusage_stat(struct thread_data *td)
{
      struct thread_stat *ts = &td->ts;

      getrusage(RUSAGE_SELF, &ts->ru_end);

      ts->usr_time += mtime_since(&ts->ru_start.ru_utime,
                              &ts->ru_end.ru_utime);
      ts->sys_time += mtime_since(&ts->ru_start.ru_stime,
                              &ts->ru_end.ru_stime);
      ts->ctx += ts->ru_end.ru_nvcsw + ts->ru_end.ru_nivcsw
                  - (ts->ru_start.ru_nvcsw + ts->ru_start.ru_nivcsw);
      ts->minf += ts->ru_end.ru_minflt - ts->ru_start.ru_minflt;
      ts->majf += ts->ru_end.ru_majflt - ts->ru_start.ru_majflt;

      memcpy(&ts->ru_start, &ts->ru_end, sizeof(ts->ru_end));
}

static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
                double *mean, double *dev)
{
      double n = is->samples;

      if (is->samples == 0)
            return 0;

      *min = is->min_val;
      *max = is->max_val;

      n = (double) is->samples;
      *mean = is->mean;

      if (n > 1.0)
            *dev = sqrt(is->S / (n - 1.0));
      else
            *dev = 0;

      return 1;
}

static void show_group_stats(struct group_run_stats *rs, int id)
{
      char *p1, *p2, *p3, *p4;
      const char *ddir_str[] = { "   READ", "  WRITE" };
      int i;

      log_info("\nRun status group %d (all jobs):\n", id);

      for (i = 0; i <= DDIR_WRITE; i++) {
            const int i2p = is_power_of_2(rs->kb_base);

            if (!rs->max_run[i])
                  continue;

            p1 = num2str(rs->io_kb[i], 6, rs->kb_base, i2p);
            p2 = num2str(rs->agg[i], 6, rs->kb_base, i2p);
            p3 = num2str(rs->min_bw[i], 6, rs->kb_base, i2p);
            p4 = num2str(rs->max_bw[i], 6, rs->kb_base, i2p);

            log_info("%s: io=%sB, aggrb=%sB/s, minb=%sB/s, maxb=%sB/s,"
                   " mint=%llumsec, maxt=%llumsec\n", ddir_str[i], p1, p2,
                                    p3, p4, rs->min_run[i],
                                    rs->max_run[i]);

            free(p1);
            free(p2);
            free(p3);
            free(p4);
      }
}

#define ts_total_io_u(ts)     \
      ((ts)->total_io_u[0] + (ts)->total_io_u[1])

static void stat_calc_dist(unsigned int *map, unsigned long total,
                     double *io_u_dist)
{
      int i;

      /*
       * Do depth distribution calculations
       */
      for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
            if (total) {
                  io_u_dist[i] = (double) map[i] / (double) total;
                  io_u_dist[i] *= 100.0;
                  if (io_u_dist[i] < 0.1 && map[i])
                        io_u_dist[i] = 0.1;
            } else
                  io_u_dist[i] = 0.0;
      }
}

static void stat_calc_lat(struct thread_stat *ts, double *dst,
                    unsigned int *src, int nr)
{
      unsigned long total = ts_total_io_u(ts);
      int i;

      /*
       * Do latency distribution calculations
       */
      for (i = 0; i < nr; i++) {
            if (total) {
                  dst[i] = (double) src[i] / (double) total;
                  dst[i] *= 100.0;
                  if (dst[i] < 0.01 && src[i])
                        dst[i] = 0.01;
            } else
                  dst[i] = 0.0;
      }
}

static void stat_calc_lat_u(struct thread_stat *ts, double *io_u_lat)
{
      stat_calc_lat(ts, io_u_lat, ts->io_u_lat_u, FIO_IO_U_LAT_U_NR);
}

static void stat_calc_lat_m(struct thread_stat *ts, double *io_u_lat)
{
      stat_calc_lat(ts, io_u_lat, ts->io_u_lat_m, FIO_IO_U_LAT_M_NR);
}

static int usec_to_msec(unsigned long *min, unsigned long *max, double *mean,
                  double *dev)
{
      if (*min > 1000 && *max > 1000 && *mean > 1000.0 && *dev > 1000.0) {
            *min /= 1000;
            *max /= 1000;
            *mean /= 1000.0;
            *dev /= 1000.0;
            return 0;
      }

      return 1;
}

static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
                       int ddir)
{
      const char *ddir_str[] = { "read ", "write" };
      unsigned long min, max, runt;
      unsigned long long bw, iops;
      double mean, dev;
      char *io_p, *bw_p, *iops_p;
      int i2p;

      if (!ts->runtime[ddir])
            return;

      i2p = is_power_of_2(rs->kb_base);
      runt = ts->runtime[ddir];

      bw = (1000 * ts->io_bytes[ddir]) / runt;
      io_p = num2str(ts->io_bytes[ddir], 6, 1, i2p);
      bw_p = num2str(bw, 6, 1, i2p);

      iops = (1000 * ts->total_io_u[ddir]) / runt;
      iops_p = num2str(iops, 6, 1, 0);

      log_info("  %s: io=%sB, bw=%sB/s, iops=%s, runt=%6lumsec\n",
                              ddir_str[ddir], io_p, bw_p, iops_p,
                              ts->runtime[ddir]);

      free(io_p);
      free(bw_p);
      free(iops_p);

      if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev)) {
            const char *base = "(usec)";
            char *minp, *maxp;

            if (!usec_to_msec(&min, &max, &mean, &dev))
                  base = "(msec)";

            minp = num2str(min, 6, 1, 0);
            maxp = num2str(max, 6, 1, 0);

            log_info("    slat %s: min=%s, max=%s, avg=%5.02f,"
                   " stdev=%5.02f\n", base, minp, maxp, mean, dev);

            free(minp);
            free(maxp);
      }
      if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev)) {
            const char *base = "(usec)";
            char *minp, *maxp;

            if (!usec_to_msec(&min, &max, &mean, &dev))
                  base = "(msec)";

            minp = num2str(min, 6, 1, 0);
            maxp = num2str(max, 6, 1, 0);

            log_info("    clat %s: min=%s, max=%s, avg=%5.02f,"
                   " stdev=%5.02f\n", base, minp, maxp, mean, dev);

            free(minp);
            free(maxp);
      }
      if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
            double p_of_agg;

            p_of_agg = mean * 100 / (double) rs->agg[ddir];
            log_info("    bw (KB/s) : min=%5lu, max=%5lu, per=%3.2f%%,"
                   " avg=%5.02f, stdev=%5.02f\n", min, max, p_of_agg,
                                          mean, dev);
      }
}

static void show_lat(double *io_u_lat, int nr, const char **ranges,
                 const char *msg)
{
      int new_line = 1, i, line = 0;

      for (i = 0; i < nr; i++) {
            if (io_u_lat[i] <= 0.0)
                  continue;
            if (new_line) {
                  if (line)
                        log_info("\n");
                  log_info("     lat (%s): ", msg);
                  new_line = 0;
                  line = 0;
            }
            if (line)
                  log_info(", ");
            log_info("%s%3.2f%%", ranges[i], io_u_lat[i]);
            line++;
            if (line == 5)
                  new_line = 1;
      }
}

static void show_lat_u(double *io_u_lat_u)
{
      const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
                         "250=", "500=", "750=", "1000=", };

      show_lat(io_u_lat_u, FIO_IO_U_LAT_U_NR, ranges, "usec");
}

static void show_lat_m(double *io_u_lat_m)
{
      const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
                         "250=", "500=", "750=", "1000=", "2000=",
                         ">=2000=", };

      show_lat(io_u_lat_m, FIO_IO_U_LAT_M_NR, ranges, "msec");
}

static void show_latencies(double *io_u_lat_u, double *io_u_lat_m)
{
      show_lat_u(io_u_lat_u);
      log_info("\n");
      show_lat_m(io_u_lat_m);
      log_info("\n");
}

static void show_thread_status(struct thread_stat *ts,
                         struct group_run_stats *rs)
{
      double usr_cpu, sys_cpu;
      unsigned long runtime;
      double io_u_dist[FIO_IO_U_MAP_NR];
      double io_u_lat_u[FIO_IO_U_LAT_U_NR];
      double io_u_lat_m[FIO_IO_U_LAT_M_NR];

      if (!(ts->io_bytes[0] + ts->io_bytes[1]) &&
          !(ts->total_io_u[0] + ts->total_io_u[1]))
            return;

      if (!ts->error) {
            log_info("%s: (groupid=%d, jobs=%d): err=%2d: pid=%d\n",
                              ts->name, ts->groupid, ts->members,
                              ts->error, (int) ts->pid);
      } else {
            log_info("%s: (groupid=%d, jobs=%d): err=%2d (%s): pid=%d\n",
                              ts->name, ts->groupid, ts->members,
                              ts->error, ts->verror, (int) ts->pid);
      }

      if (ts->description)
            log_info("  Description  : [%s]\n", ts->description);

      if (ts->io_bytes[DDIR_READ])
            show_ddir_status(rs, ts, DDIR_READ);
      if (ts->io_bytes[DDIR_WRITE])
            show_ddir_status(rs, ts, DDIR_WRITE);

      runtime = ts->total_run_time;
      if (runtime) {
            double runt = (double) runtime;

            usr_cpu = (double) ts->usr_time * 100 / runt;
            sys_cpu = (double) ts->sys_time * 100 / runt;
      } else {
            usr_cpu = 0;
            sys_cpu = 0;
      }

      log_info("  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu, majf=%lu,"
             " minf=%lu\n", usr_cpu, sys_cpu, ts->ctx, ts->majf, ts->minf);

      stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
      log_info("  IO depths    : 1=%3.1f%%, 2=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%,"
             " 16=%3.1f%%, 32=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
                              io_u_dist[1], io_u_dist[2],
                              io_u_dist[3], io_u_dist[4],
                              io_u_dist[5], io_u_dist[6]);

      stat_calc_dist(ts->io_u_submit, ts->total_submit, io_u_dist);
      log_info("     submit    : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
             " 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
                              io_u_dist[1], io_u_dist[2],
                              io_u_dist[3], io_u_dist[4],
                              io_u_dist[5], io_u_dist[6]);
      stat_calc_dist(ts->io_u_complete, ts->total_complete, io_u_dist);
      log_info("     complete  : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
             " 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
                              io_u_dist[1], io_u_dist[2],
                              io_u_dist[3], io_u_dist[4],
                              io_u_dist[5], io_u_dist[6]);
      log_info("     issued r/w: total=%lu/%lu, short=%lu/%lu\n",
                              ts->total_io_u[0], ts->total_io_u[1],
                              ts->short_io_u[0], ts->short_io_u[1]);
      stat_calc_lat_u(ts, io_u_lat_u);
      stat_calc_lat_m(ts, io_u_lat_m);
      show_latencies(io_u_lat_u, io_u_lat_m);
      if (ts->continue_on_error) {
            log_info("     errors    : total=%lu, first_error=%d/<%s>\n",
                              ts->total_err_count,
                              ts->first_error,
                              strerror(ts->first_error));
      }
}

static void show_ddir_status_terse(struct thread_stat *ts,
                           struct group_run_stats *rs, int ddir)
{
      unsigned long min, max;
      unsigned long long bw;
      double mean, dev;

      bw = 0;
      if (ts->runtime[ddir])
            bw = ts->io_bytes[ddir] / ts->runtime[ddir];

      log_info(";%llu;%llu;%lu", ts->io_bytes[ddir] >> 10, bw,
                                          ts->runtime[ddir]);

      if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev))
            log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
      else
            log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

      if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev))
            log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
      else
            log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

      if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
            double p_of_agg;

            p_of_agg = mean * 100 / (double) rs->agg[ddir];
            log_info(";%lu;%lu;%f%%;%f;%f", min, max, p_of_agg, mean, dev);
      } else
            log_info(";%lu;%lu;%f%%;%f;%f", 0UL, 0UL, 0.0, 0.0, 0.0);
}


static void show_thread_status_terse(struct thread_stat *ts,
                             struct group_run_stats *rs)
{
      double io_u_dist[FIO_IO_U_MAP_NR];
      double io_u_lat_u[FIO_IO_U_LAT_U_NR];
      double io_u_lat_m[FIO_IO_U_LAT_M_NR];
      double usr_cpu, sys_cpu;
      int i;

      log_info("%s;%d;%d", ts->name, ts->groupid, ts->error);

      show_ddir_status_terse(ts, rs, 0);
      show_ddir_status_terse(ts, rs, 1);

      if (ts->total_run_time) {
            double runt = (double) ts->total_run_time;

            usr_cpu = (double) ts->usr_time * 100 / runt;
            sys_cpu = (double) ts->sys_time * 100 / runt;
      } else {
            usr_cpu = 0;
            sys_cpu = 0;
      }

      log_info(";%f%%;%f%%;%lu;%lu;%lu", usr_cpu, sys_cpu, ts->ctx, ts->majf,
                                                ts->minf);

      stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
      stat_calc_lat_u(ts, io_u_lat_u);
      stat_calc_lat_m(ts, io_u_lat_m);

      log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%",
                  io_u_dist[0], io_u_dist[1], io_u_dist[2], io_u_dist[3],
                  io_u_dist[4], io_u_dist[5], io_u_dist[6]);

      for (i = 0; i < FIO_IO_U_LAT_U_NR; i++)
            log_info(";%3.2f%%", io_u_lat_u[i]);
      for (i = 0; i < FIO_IO_U_LAT_M_NR; i++)
            log_info(";%3.2f%%", io_u_lat_m[i]);
      if (ts->continue_on_error)
            log_info(";%lu;%d", ts->total_err_count, ts->first_error);
      log_info("\n");

      if (ts->description)
            log_info(";%s", ts->description);

      log_info("\n");
}

static void sum_stat(struct io_stat *dst, struct io_stat *src, int nr)
{
      double mean, S;

      dst->min_val = min(dst->min_val, src->min_val);
      dst->max_val = max(dst->max_val, src->max_val);
      dst->samples += src->samples;

      /*
       * Needs a new method for calculating stddev, we cannot just
       * average them we do below for nr > 1
       */
      if (nr == 1) {
            mean = src->mean;
            S = src->S;
      } else {
            mean = ((src->mean * (double) (nr - 1))
                        + dst->mean) / ((double) nr);
            S = ((src->S * (double) (nr - 1)) + dst->S) / ((double) nr);
      }

      dst->mean = mean;
      dst->S = S;
}

void show_run_stats(void)
{
      struct group_run_stats *runstats, *rs;
      struct thread_data *td;
      struct thread_stat *threadstats, *ts;
      int i, j, k, l, nr_ts, last_ts, idx;
      int kb_base_warned = 0;

      runstats = malloc(sizeof(struct group_run_stats) * (groupid + 1));

      for (i = 0; i < groupid + 1; i++) {
            rs = &runstats[i];

            memset(rs, 0, sizeof(*rs));
            rs->min_bw[0] = rs->min_run[0] = ~0UL;
            rs->min_bw[1] = rs->min_run[1] = ~0UL;
      }

      /*
       * find out how many threads stats we need. if group reporting isn't
       * enabled, it's one-per-td.
       */
      nr_ts = 0;
      last_ts = -1;
      for_each_td(td, i) {
            if (!td->o.group_reporting) {
                  nr_ts++;
                  continue;
            }
            if (last_ts == td->groupid)
                  continue;

            last_ts = td->groupid;
            nr_ts++;
      }

      threadstats = malloc(nr_ts * sizeof(struct thread_stat));

      for (i = 0; i < nr_ts; i++) {
            ts = &threadstats[i];

            memset(ts, 0, sizeof(*ts));
            for (j = 0; j <= DDIR_WRITE; j++) {
                  ts->clat_stat[j].min_val = -1UL;
                  ts->slat_stat[j].min_val = -1UL;
                  ts->bw_stat[j].min_val = -1UL;
            }
            ts->groupid = -1;
      }

      j = 0;
      last_ts = -1;
      idx = 0;
      for_each_td(td, i) {
            if (idx && (!td->o.group_reporting ||
                (td->o.group_reporting && last_ts != td->groupid))) {
                  idx = 0;
                  j++;
            }

            last_ts = td->groupid;

            ts = &threadstats[j];

            idx++;
            ts->members++;

            if (ts->groupid == -1) {
                  /*
                   * These are per-group shared already
                   */
                  ts->name = td->o.name;
                  ts->description = td->o.description;
                  ts->groupid = td->groupid;

                  /*
                   * first pid in group, not very useful...
                   */
                  ts->pid = td->pid;

                  ts->kb_base = td->o.kb_base;
            } else if (ts->kb_base != td->o.kb_base && !kb_base_warned) {
                  log_info("fio: kb_base differs for jobs in group, using"
                         " %u as the base\n", ts->kb_base);
                  kb_base_warned = 1;
            }

            ts->continue_on_error = td->o.continue_on_error;
            ts->total_err_count += td->total_err_count;
            ts->first_error = td->first_error;
            if (!ts->error) {
                  if (!td->error && td->o.continue_on_error &&
                      td->first_error) {
                        ts->error = td->first_error;
                        ts->verror = td->verror;
                  } else  if (td->error) {
                        ts->error = td->error;
                        ts->verror = td->verror;
                  }
            }

            for (l = 0; l <= DDIR_WRITE; l++) {
                  sum_stat(&ts->clat_stat[l], &td->ts.clat_stat[l], idx);
                  sum_stat(&ts->slat_stat[l], &td->ts.slat_stat[l], idx);
                  sum_stat(&ts->bw_stat[l], &td->ts.bw_stat[l], idx);

                  ts->stat_io_bytes[l] += td->ts.stat_io_bytes[l];
                  ts->io_bytes[l] += td->ts.io_bytes[l];

                  if (ts->runtime[l] < td->ts.runtime[l])
                        ts->runtime[l] = td->ts.runtime[l];
            }

            ts->usr_time += td->ts.usr_time;
            ts->sys_time += td->ts.sys_time;
            ts->ctx += td->ts.ctx;
            ts->majf += td->ts.majf;
            ts->minf += td->ts.minf;

            for (k = 0; k < FIO_IO_U_MAP_NR; k++)
                  ts->io_u_map[k] += td->ts.io_u_map[k];
            for (k = 0; k < FIO_IO_U_MAP_NR; k++)
                  ts->io_u_submit[k] += td->ts.io_u_submit[k];
            for (k = 0; k < FIO_IO_U_MAP_NR; k++)
                  ts->io_u_complete[k] += td->ts.io_u_complete[k];
            for (k = 0; k < FIO_IO_U_LAT_U_NR; k++)
                  ts->io_u_lat_u[k] += td->ts.io_u_lat_u[k];
            for (k = 0; k < FIO_IO_U_LAT_M_NR; k++)
                  ts->io_u_lat_m[k] += td->ts.io_u_lat_m[k];


            for (k = 0; k <= DDIR_WRITE; k++) {
                  ts->total_io_u[k] += td->ts.total_io_u[k];
                  ts->short_io_u[k] += td->ts.short_io_u[k];
            }

            ts->total_run_time += td->ts.total_run_time;
            ts->total_submit += td->ts.total_submit;
            ts->total_complete += td->ts.total_complete;
      }

      for (i = 0; i < nr_ts; i++) {
            unsigned long long bw;

            ts = &threadstats[i];
            rs = &runstats[ts->groupid];
            rs->kb_base = ts->kb_base;

            for (j = 0; j <= DDIR_WRITE; j++) {
                  if (!ts->runtime[j])
                        continue;
                  if (ts->runtime[j] < rs->min_run[j] || !rs->min_run[j])
                        rs->min_run[j] = ts->runtime[j];
                  if (ts->runtime[j] > rs->max_run[j])
                        rs->max_run[j] = ts->runtime[j];

                  bw = 0;
                  if (ts->runtime[j]) {
                        unsigned long runt;

                        runt = ts->runtime[j];
                        bw = ts->io_bytes[j] / runt;
                  }
                  if (bw < rs->min_bw[j])
                        rs->min_bw[j] = bw;
                  if (bw > rs->max_bw[j])
                        rs->max_bw[j] = bw;

                  rs->io_kb[j] += ts->io_bytes[j] / rs->kb_base;
            }
      }

      for (i = 0; i < groupid + 1; i++) {
            unsigned long max_run[2];

            rs = &runstats[i];
            max_run[0] = rs->max_run[0];
            max_run[1] = rs->max_run[1];

            if (rs->max_run[0])
                  rs->agg[0] = (rs->io_kb[0] * 1000) / max_run[0];
            if (rs->max_run[1])
                  rs->agg[1] = (rs->io_kb[1] * 1000) / max_run[1];
      }

      /*
       * don't overwrite last signal output
       */
      if (!terse_output)
            printf("\n");

      for (i = 0; i < nr_ts; i++) {
            ts = &threadstats[i];
            rs = &runstats[ts->groupid];

            if (terse_output)
                  show_thread_status_terse(ts, rs);
            else
                  show_thread_status(ts, rs);
      }

      if (!terse_output) {
            for (i = 0; i < groupid + 1; i++)
                  show_group_stats(&runstats[i], i);

            show_disk_util();
      }

      free(runstats);
      free(threadstats);
}

static inline void add_stat_sample(struct io_stat *is, unsigned long data)
{
      double val = data;
      double delta;

      if (data > is->max_val)
            is->max_val = data;
      if (data < is->min_val)
            is->min_val = data;

      delta = val - is->mean;
      if (delta) {
            is->mean += delta / (is->samples + 1.0);
            is->S += delta * (val - is->mean);
      }

      is->samples++;
}

static void __add_log_sample(struct io_log *iolog, unsigned long val,
                       enum fio_ddir ddir, unsigned int bs,
                       unsigned long time)
{
      const int nr_samples = iolog->nr_samples;

      if (iolog->nr_samples == iolog->max_samples) {
            int new_size = sizeof(struct io_sample) * iolog->max_samples*2;

            iolog->log = realloc(iolog->log, new_size);
            iolog->max_samples <<= 1;
      }

      iolog->log[nr_samples].val = val;
      iolog->log[nr_samples].time = time;
      iolog->log[nr_samples].ddir = ddir;
      iolog->log[nr_samples].bs = bs;
      iolog->nr_samples++;
}

static void add_log_sample(struct thread_data *td, struct io_log *iolog,
                     unsigned long val, enum fio_ddir ddir,
                     unsigned int bs)
{
      __add_log_sample(iolog, val, ddir, bs, mtime_since_now(&td->epoch));
}

void add_agg_sample(unsigned long val, enum fio_ddir ddir, unsigned int bs)
{
      struct io_log *iolog = agg_io_log[ddir];

      __add_log_sample(iolog, val, ddir, bs, mtime_since_genesis());
}

void add_clat_sample(struct thread_data *td, enum fio_ddir ddir,
                 unsigned long usec, unsigned int bs)
{
      struct thread_stat *ts = &td->ts;

      add_stat_sample(&ts->clat_stat[ddir], usec);

      if (ts->clat_log)
            add_log_sample(td, ts->clat_log, usec, ddir, bs);
}

void add_slat_sample(struct thread_data *td, enum fio_ddir ddir,
                 unsigned long usec, unsigned int bs)
{
      struct thread_stat *ts = &td->ts;

      add_stat_sample(&ts->slat_stat[ddir], usec);

      if (ts->slat_log)
            add_log_sample(td, ts->slat_log, usec, ddir, bs);
}

void add_bw_sample(struct thread_data *td, enum fio_ddir ddir, unsigned int bs,
               struct timeval *t)
{
      struct thread_stat *ts = &td->ts;
      unsigned long spent = mtime_since(&ts->stat_sample_time[ddir], t);
      unsigned long rate;

      if (spent < td->o.bw_avg_time)
            return;

      rate = (td->this_io_bytes[ddir] - ts->stat_io_bytes[ddir]) * 1000 / spent / 1024;
      add_stat_sample(&ts->bw_stat[ddir], rate);

      if (ts->bw_log)
            add_log_sample(td, ts->bw_log, rate, ddir, bs);

      fio_gettime(&ts->stat_sample_time[ddir], NULL);
      ts->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
}

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