/*
* 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));
}