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-rw-r--r--btt/iostat.c283
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diff --git a/btt/iostat.c b/btt/iostat.c
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+++ b/btt/iostat.c
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+/*
+ * blktrace output analysis: generate a timeline & gather statistics
+ *
+ * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.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, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include "globals.h"
+
+#define INC_STAT(dip, fld) \
+ do { \
+ (dip)->stats. fld ++; \
+ (dip)->all_stats. fld ++; \
+ } while (0)
+
+#define DEC_STAT(dip, fld) \
+ do { \
+ (dip)->stats. fld --; \
+ (dip)->all_stats. fld --; \
+ } while (0)
+
+#define ADD_STAT(dip, fld, val) \
+ do { \
+ __u64 __v = (val); \
+ (dip)->stats. fld += __v; \
+ (dip)->all_stats. fld += __v; \
+ } while (0)
+
+#define SUB_STAT(dip, fld, val) \
+ do { \
+ __u64 __v = (val); \
+ (dip)->stats. fld -= __v; \
+ (dip)->all_stats. fld -= __v; \
+ } while (0)
+
+__u64 last_start, iostat_last_stamp;
+__u64 iostat_interval = 1000000000;
+char *iostat_name = NULL;
+FILE *iostat_ofp = NULL;
+
+static void dump_hdr(void)
+{
+ fprintf(iostat_ofp, "Device: rrqm/s wrqm/s r/s w/s "
+ "rsec/s wsec/s rkB/s wkB/s "
+ "avgrq-sz avgqu-sz await svctm %%util Stamp\n");
+}
+
+static void update_tot_qusz(struct d_info *dip, double now)
+{
+ dip->stats.tot_qusz += ((now - dip->stats.last_qu_change) *
+ dip->stats.cur_qusz);
+ dip->all_stats.tot_qusz += ((now - dip->all_stats.last_qu_change) *
+ dip->all_stats.cur_qusz);
+
+ dip->stats.last_qu_change = dip->all_stats.last_qu_change = now;
+}
+
+static void update_idle_time(struct d_info *dip, double now, int force)
+{
+ if (dip->stats.cur_dev == 0 || force) {
+ dip->stats.idle_time += (now - dip->stats.last_dev_change);
+ dip->all_stats.idle_time +=
+ (now - dip->all_stats.last_dev_change);
+ }
+ dip->stats.last_dev_change = dip->all_stats.last_dev_change = now;
+}
+
+void __dump_stats(__u64 stamp, int all, struct d_info *dip, struct stats_t *asp)
+{
+ char hdr[16];
+ struct stats *sp;
+ double dt, nios, avgrq_sz, p_util, nrqm, await, svctm;
+ double now = TO_SEC(stamp);
+
+ if (all) {
+ dt = (double)stamp / 1.0e9;
+ sp = &dip->all_stats;
+ } else {
+ dt = (double)(stamp-last_start) / 1.0e9;
+ sp = &dip->stats;
+ }
+
+ nios = (double)(sp->ios[0] + sp->ios[1]);
+ nrqm = (double)(sp->rqm[0] + sp->rqm[1]);
+ update_idle_time(dip, now, 1);
+ update_tot_qusz(dip, now);
+
+ if (nios > 0.0) {
+ avgrq_sz = (double)(sp->sec[0] + sp->sec[1]) / nios;
+ svctm = TO_MSEC(sp->svctm) / nios;
+ } else
+ avgrq_sz = svctm = 0.0;
+
+ await = ((nios + nrqm) > 0.0) ? TO_MSEC(sp->wait) / (nios+nrqm) : 0.0;
+ p_util = (sp->idle_time <= dt) ? 100.0 * (1.0 - (sp->idle_time / dt)) :
+ 0.0;
+
+ /*
+ * For AWAIT: nios should be the same as number of inserts
+ * and we add in nrqm (number of merges), which should give
+ * us the total number of IOs sent to the block IO layer.
+ */
+ fprintf(iostat_ofp, "%-11s ", make_dev_hdr(hdr, 11, dip, 1));
+ fprintf(iostat_ofp, "%8.2lf ", (double)sp->rqm[1] / dt);
+ fprintf(iostat_ofp, "%8.2lf ", (double)sp->rqm[0] / dt);
+ fprintf(iostat_ofp, "%7.2lf ", (double)sp->ios[1] / dt);
+ fprintf(iostat_ofp, "%7.2lf ", (double)sp->ios[0] / dt);
+ fprintf(iostat_ofp, "%9.2lf ", (double)sp->sec[1] / dt);
+ fprintf(iostat_ofp, "%9.2lf ", (double)sp->sec[0] / dt);
+ fprintf(iostat_ofp, "%9.2lf ", (double)(sp->sec[1] / 2) / dt);
+ fprintf(iostat_ofp, "%9.2lf ", (double)(sp->sec[0] / 2) / dt);
+ fprintf(iostat_ofp, "%8.2lf ", avgrq_sz);
+ fprintf(iostat_ofp, "%8.2lf ", (double)sp->tot_qusz / dt);
+ fprintf(iostat_ofp, "%7.2lf ", await);
+ fprintf(iostat_ofp, "%7.2lf ", svctm);
+ fprintf(iostat_ofp, "%6.2lf", p_util);
+ if (all)
+ fprintf(iostat_ofp, "%8s\n", "TOTAL");
+ else {
+ fprintf(iostat_ofp, "%8.2lf\n", TO_SEC(stamp));
+ sp->rqm[0] = sp->rqm[1] = 0;
+ sp->ios[0] = sp->ios[1] = 0;
+ sp->sec[0] = sp->sec[1] = 0;
+ sp->wait = sp->svctm = 0;
+
+ sp->tot_qusz = sp->idle_time = 0.0;
+ }
+
+ if (asp) {
+ int i;
+
+ asp->n += 1.0;
+ for (i = 0; i < 2; i++) {
+ asp->rqm_s[i] += ((double)sp->rqm[i] / dt);
+ asp->ios_s[i] += ((double)sp->ios[i] / dt);
+ asp->sec_s[i] += ((double)sp->sec[i] / dt);
+ }
+ asp->avgrq_sz += avgrq_sz;
+ asp->avgqu_sz += (double)sp->tot_qusz / dt;
+ asp->await += await;
+ asp->svctm += svctm;
+ asp->p_util += p_util;
+ }
+}
+
+static void __dump_stats_t(__u64 stamp, struct stats_t *asp, int all)
+{
+ if (asp->n < 2.0) return; // What's the point?
+
+ fprintf(iostat_ofp, "%-11s ", "TOTAL");
+ fprintf(iostat_ofp, "%8.2lf ", asp->rqm_s[0]);
+ fprintf(iostat_ofp, "%8.2lf ", asp->rqm_s[1]);
+ fprintf(iostat_ofp, "%7.2lf ", asp->ios_s[0]);
+ fprintf(iostat_ofp, "%7.2lf ", asp->ios_s[1]);
+ fprintf(iostat_ofp, "%9.2lf ", asp->sec_s[0]);
+ fprintf(iostat_ofp, "%9.2lf ", asp->sec_s[1]);
+ fprintf(iostat_ofp, "%9.2lf ", asp->sec_s[0] / 2.0);
+ fprintf(iostat_ofp, "%9.2lf ", asp->sec_s[1] / 2.0);
+ fprintf(iostat_ofp, "%8.2lf ", asp->avgrq_sz / asp->n);
+ fprintf(iostat_ofp, "%8.2lf ", asp->avgqu_sz / asp->n);
+ fprintf(iostat_ofp, "%7.2lf ", asp->await / asp->n);
+ fprintf(iostat_ofp, "%7.2lf ", asp->svctm / asp->n);
+ fprintf(iostat_ofp, "%6.2lf", asp->p_util / asp->n);
+ if (all)
+ fprintf(iostat_ofp, "%8s\n", "TOTAL");
+ else
+ fprintf(iostat_ofp, "%8.2lf\n", TO_SEC(stamp));
+}
+
+void iostat_init(void)
+{
+ last_start = (__u64)-1;
+ if (iostat_ofp)
+ dump_hdr();
+}
+
+void iostat_dump_stats(__u64 stamp, int all)
+{
+ struct d_info *dip;
+ struct stats_t as;
+
+ memset(&as, 0, sizeof(struct stats_t));
+ if (all)
+ dump_hdr();
+
+ if (devices == NULL) {
+ struct list_head *p;
+
+ __list_for_each(p, &all_devs) {
+ dip = list_entry(p, struct d_info, all_head);
+ __dump_stats(stamp, all, dip, &as);
+ }
+ } else {
+ int i;
+ unsigned int mjr, mnr;
+ char *p = devices;
+
+ while (p && ((i = sscanf(p, "%u,%u", &mjr, &mnr)) == 2)) {
+ dip = __dip_find((__u32)((mjr << MINORBITS) | mnr));
+ __dump_stats(stamp, all, dip, &as);
+
+ p = strchr(p, ';');
+ if (p) p++;
+ }
+ }
+
+ __dump_stats_t(stamp, &as, all);
+
+ if (!all && iostat_ofp)
+ fprintf(iostat_ofp, "\n");
+}
+
+void iostat_check_time(__u64 stamp)
+{
+ if (iostat_ofp) {
+ if (last_start == (__u64)-1)
+ last_start = stamp;
+ else if ((stamp - last_start) >= iostat_interval) {
+ iostat_dump_stats(stamp, 0);
+ last_start = stamp;
+ }
+
+ iostat_last_stamp = stamp;
+ }
+}
+
+void iostat_getrq(struct io *iop)
+{
+ update_tot_qusz(iop->dip, TO_SEC(iop->t.time));
+ INC_STAT(iop->dip, cur_qusz);
+}
+
+void iostat_merge(struct io *iop)
+{
+ INC_STAT(iop->dip, rqm[IOP_RW(iop)]);
+}
+
+void iostat_issue(struct io *iop)
+{
+ int rw = IOP_RW(iop);
+ struct d_info *dip = iop->dip;
+ double now = TO_SEC(iop->t.time);
+
+ INC_STAT(dip, ios[rw]);
+ ADD_STAT(dip, sec[rw], iop->t.bytes >> 9);
+
+ update_idle_time(dip, now, 0);
+ INC_STAT(dip, cur_dev);
+}
+
+void iostat_complete(struct io *q_iop, struct io *c_iop)
+{
+ double now = TO_SEC(c_iop->t.time);
+ struct d_info *dip = q_iop->dip;
+
+ if (q_iop->i_time != (__u64)-1)
+ ADD_STAT(c_iop->dip, wait, tdelta(q_iop->i_time,c_iop->t.time));
+ else if (q_iop->m_time != (__u64)-1)
+ ADD_STAT(c_iop->dip, wait, tdelta(q_iop->m_time,c_iop->t.time));
+
+ update_tot_qusz(dip, now);
+ DEC_STAT(dip, cur_qusz);
+
+ update_idle_time(dip, now, 0);
+ DEC_STAT(dip, cur_dev);
+
+ ADD_STAT(dip, svctm, tdelta(q_iop->t.time, c_iop->t.time));
+}
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