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[SIGAR-65] solaris disk_usage.service_time impl

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This commit is contained in:
Doug MacEachern 2007-11-07 05:41:08 +00:00
parent 7720fc973d
commit 2e6a1c1a20
1 changed files with 71 additions and 9 deletions
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80
src/os/solaris/solaris_sigar.c
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@ -1562,16 +1562,18 @@ static int io_kstat_read(sigar_t *sigar,
disk->read_bytes = io->nread;
disk->write_bytes = io->nwritten;
disk->queue = io->wcnt; /* XXX ? */
disk->rtime = io->rlentime * 1000;
disk->wtime = io->wlentime * 1000;
disk->rtime = io->rlentime;
disk->wtime = io->wlentime;
disk->time = disk->rtime + disk->wtime;
disk->snaptime = ksp->ks_snaptime;
return SIGAR_OK;
}
static int sigar_kstat_disk_usage_get(sigar_t *sigar, const char *name,
sigar_disk_usage_t *disk)
sigar_disk_usage_t *disk,
kstat_t **kio)
{
kstat_t *ksp;
@ -1579,8 +1581,6 @@ static int sigar_kstat_disk_usage_get(sigar_t *sigar, const char *name,
return errno;
}
SIGAR_DISK_STATS_INIT(disk);
for (ksp = sigar->kc->kc_chain;
ksp;
ksp = ksp->ks_next)
@ -1589,7 +1589,9 @@ static int sigar_kstat_disk_usage_get(sigar_t *sigar, const char *name,
continue;
}
if (strEQ(ksp->ks_name, name)) {
return io_kstat_read(sigar, disk, ksp);
int status = io_kstat_read(sigar, disk, ksp);
*kio = ksp;
return status;
}
}
@ -1608,11 +1610,14 @@ static int simple_hash(const char *s)
int sigar_disk_usage_get(sigar_t *sigar, const char *name,
sigar_disk_usage_t *disk)
{
kstat_t *ksp;
int status;
iodev_t *iodev;
iodev_t *iodev = NULL;
sigar_cache_entry_t *ent;
sigar_uint64_t id;
SIGAR_DISK_STATS_INIT(disk);
if (!sigar->fsdev) {
if (create_fsdev_cache(sigar) != SIGAR_OK) {
return SIGAR_OK;
@ -1632,10 +1637,11 @@ int sigar_disk_usage_get(sigar_t *sigar, const char *name,
return ENXIO;
}
iodev = (iodev_t *)ent->value;
status = sigar_kstat_disk_usage_get(sigar, iodev->name, disk);
status = sigar_kstat_disk_usage_get(sigar, iodev->name, disk, &ksp);
}
else {
status = sigar_kstat_disk_usage_get(sigar, name, disk);
status = sigar_kstat_disk_usage_get(sigar, name, disk, &ksp);
if (status != SIGAR_OK) {
return status;
}
@ -1651,6 +1657,62 @@ int sigar_disk_usage_get(sigar_t *sigar, const char *name,
}
}
/* service_time formula derived from opensolaris.org:iostat.c */
if ((status == SIGAR_OK) && iodev) {
sigar_uint64_t delta;
double avw, avr, tps, mtps;
double etime, hr_etime;
if (iodev->disk.snaptime) {
delta = disk->snaptime - iodev->disk.snaptime;
}
else {
delta = ksp->ks_crtime - ksp->ks_snaptime;
}
hr_etime = (double)delta;
if (hr_etime == 0.0) {
hr_etime = (double)NANOSEC;
}
etime = hr_etime / (double)NANOSEC;
tps =
(((double)(disk->reads - iodev->disk.reads)) / etime) +
(((double)(disk->writes - iodev->disk.writes)) / etime);
delta = disk->wtime - iodev->disk.wtime;
if (delta) {
avw = (double)delta;
avw /= hr_etime;
}
else {
avw = 0.0;
}
delta = disk->rtime - iodev->disk.rtime;
if (delta) {
avr = (double)delta;
avr /= hr_etime;
}
else {
avr = 0.0;
}
disk->service_time = 0.0;
if (tps && (avw != 0.0 || avr != 0.0)) {
mtps = 1000.0 / tps;
if (avw != 0.0) {
disk->service_time += avw * mtps;
}
if (avr != 0.0) {
disk->service_time += avr * mtps;
}
}
memcpy(&iodev->disk, disk, sizeof(iodev->disk));
}
return status;
}