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Remove pool io kstats (#12212) 

This mostly reverts "3537 want pool io kstats" commit of 8 years ago.

From one side this code using pool-wide locks became pretty bad for
performance, creating significant lock contention in I/O pipeline.
From another, there are more efficient ways now to obtain detailed
statistics, while this statistics is illumos-specific and much less
usable on Linux and FreeBSD, reported only via procfs/sysctls.

This commit does not remove KSTAT_TYPE_IO implementation, that may
be removed later together with already unused KSTAT_TYPE_INTR and
KSTAT_TYPE_TIMER.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #12212
This commit is contained in:
Alexander Motin 2021-06-10 11:27:33 -04:00 committed by GitHub
parent 860051f1d1
commit 371f88d96f
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 0 additions and 276 deletions
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4
include/os/freebsd/spl/sys/kstat.h
View File

@ -210,10 +210,6 @@ extern kstat_t *__kstat_create(const char *ks_module, int ks_instance,
extern void __kstat_install(kstat_t *ksp);
extern void __kstat_delete(kstat_t *ksp);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
#define kstat_set_seq_raw_ops(k, h, d, a) \
__kstat_set_seq_raw_ops(k, h, d, a)

4
include/os/linux/spl/sys/kstat.h
View File

@ -206,10 +206,6 @@ extern void kstat_proc_entry_install(kstat_proc_entry_t *kpep, mode_t mode,
extern void __kstat_install(kstat_t *ksp);
extern void __kstat_delete(kstat_t *ksp);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
#define kstat_set_raw_ops(k, h, d, a) \
__kstat_set_raw_ops(k, h, d, a)

1
include/sys/spa.h
View File

@ -895,7 +895,6 @@ typedef struct spa_stats {
spa_history_list_t read_history;
spa_history_list_t txg_history;
spa_history_kstat_t tx_assign_histogram;
spa_history_kstat_t io_history;
spa_history_list_t mmp_history;
spa_history_kstat_t state; /* pool state */
spa_history_kstat_t iostats;

6
include/sys/zfs_context.h
View File

@ -360,12 +360,6 @@ extern kstat_t *kstat_create(const char *, int,
const char *, const char *, uchar_t, ulong_t, uchar_t);
extern void kstat_install(kstat_t *);
extern void kstat_delete(kstat_t *);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
extern void kstat_waitq_to_runq(kstat_io_t *);
extern void kstat_runq_back_to_waitq(kstat_io_t *);
extern void kstat_set_raw_ops(kstat_t *ksp,
int (*headers)(char *buf, size_t size),
int (*data)(char *buf, size_t size, void *data),

6
lib/libspl/include/sys/kstat.h
View File

@ -796,12 +796,6 @@ extern void kstat_delete_byname(const char *, int, const char *);
extern void kstat_delete_byname_zone(const char *, int, const char *, zoneid_t);
extern void kstat_named_init(kstat_named_t *, const char *, uchar_t);
extern void kstat_timer_init(kstat_timer_t *, const char *);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
extern void kstat_waitq_to_runq(kstat_io_t *);
extern void kstat_runq_back_to_waitq(kstat_io_t *);
extern void kstat_timer_start(kstat_timer_t *);
extern void kstat_timer_stop(kstat_timer_t *);

30
lib/libzpool/kernel.c
View File

@ -146,36 +146,6 @@ void
kstat_delete(kstat_t *ksp)
{}
/*ARGSUSED*/
void
kstat_waitq_enter(kstat_io_t *kiop)
{}
/*ARGSUSED*/
void
kstat_waitq_exit(kstat_io_t *kiop)
{}
/*ARGSUSED*/
void
kstat_runq_enter(kstat_io_t *kiop)
{}
/*ARGSUSED*/
void
kstat_runq_exit(kstat_io_t *kiop)
{}
/*ARGSUSED*/
void
kstat_waitq_to_runq(kstat_io_t *kiop)
{}
/*ARGSUSED*/
void
kstat_runq_back_to_waitq(kstat_io_t *kiop)
{}
void
kstat_set_raw_ops(kstat_t *ksp,
int (*headers)(char *buf, size_t size),

62
module/os/freebsd/spl/spl_kstat.c
View File

@ -508,65 +508,3 @@ kstat_delete(kstat_t *ksp)
kmem_free(ksp->ks_data, ksp->ks_data_size);
free(ksp, M_KSTAT);
}
void
kstat_waitq_enter(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t wcnt;
new = gethrtime();
delta = new - kiop->wlastupdate;
kiop->wlastupdate = new;
wcnt = kiop->wcnt++;
if (wcnt != 0) {
kiop->wlentime += delta * wcnt;
kiop->wtime += delta;
}
}
void
kstat_waitq_exit(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t wcnt;
new = gethrtime();
delta = new - kiop->wlastupdate;
kiop->wlastupdate = new;
wcnt = kiop->wcnt--;
ASSERT3S(wcnt, >, 0);
kiop->wlentime += delta * wcnt;
kiop->wtime += delta;
}
void
kstat_runq_enter(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t rcnt;
new = gethrtime();
delta = new - kiop->rlastupdate;
kiop->rlastupdate = new;
rcnt = kiop->rcnt++;
if (rcnt != 0) {
kiop->rlentime += delta * rcnt;
kiop->rtime += delta;
}
}
void
kstat_runq_exit(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t rcnt;
new = gethrtime();
delta = new - kiop->rlastupdate;
kiop->rlastupdate = new;
rcnt = kiop->rcnt--;
ASSERT3S(rcnt, >, 0);
kiop->rlentime += delta * rcnt;
kiop->rtime += delta;
}

66
module/os/linux/spl/spl-kstat.c
View File

@ -50,72 +50,6 @@ kstat_resize_raw(kstat_t *ksp)
return (0);
}
void
kstat_waitq_enter(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t wcnt;
new = gethrtime();
delta = new - kiop->wlastupdate;
kiop->wlastupdate = new;
wcnt = kiop->wcnt++;
if (wcnt != 0) {
kiop->wlentime += delta * wcnt;
kiop->wtime += delta;
}
}
EXPORT_SYMBOL(kstat_waitq_enter);
void
kstat_waitq_exit(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t wcnt;
new = gethrtime();
delta = new - kiop->wlastupdate;
kiop->wlastupdate = new;
wcnt = kiop->wcnt--;
ASSERT((int)wcnt > 0);
kiop->wlentime += delta * wcnt;
kiop->wtime += delta;
}
EXPORT_SYMBOL(kstat_waitq_exit);
void
kstat_runq_enter(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t rcnt;
new = gethrtime();
delta = new - kiop->rlastupdate;
kiop->rlastupdate = new;
rcnt = kiop->rcnt++;
if (rcnt != 0) {
kiop->rlentime += delta * rcnt;
kiop->rtime += delta;
}
}
EXPORT_SYMBOL(kstat_runq_enter);
void
kstat_runq_exit(kstat_io_t *kiop)
{
hrtime_t new, delta;
ulong_t rcnt;
new = gethrtime();
delta = new - kiop->rlastupdate;
kiop->rlastupdate = new;
rcnt = kiop->rcnt--;
ASSERT((int)rcnt > 0);
kiop->rlentime += delta * rcnt;
kiop->rtime += delta;
}
EXPORT_SYMBOL(kstat_runq_exit);
static int
kstat_seq_show_headers(struct seq_file *f)
{

50
module/zfs/spa_stats.c
View File

@ -548,54 +548,6 @@ spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs)
atomic_inc_64(&((kstat_named_t *)shk->priv)[idx].value.ui64);
}
/*
* ==========================================================================
* SPA IO History Routines
* ==========================================================================
*/
static int
spa_io_history_update(kstat_t *ksp, int rw)
{
if (rw == KSTAT_WRITE)
memset(ksp->ks_data, 0, ksp->ks_data_size);
return (0);
}
static void
spa_io_history_init(spa_t *spa)
{
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
char *name;
kstat_t *ksp;
mutex_init(&shk->lock, NULL, MUTEX_DEFAULT, NULL);
name = kmem_asprintf("zfs/%s", spa_name(spa));
ksp = kstat_create(name, 0, "io", "disk", KSTAT_TYPE_IO, 1, 0);
shk->kstat = ksp;
if (ksp) {
ksp->ks_lock = &shk->lock;
ksp->ks_private = spa;
ksp->ks_update = spa_io_history_update;
kstat_install(ksp);
}
kmem_strfree(name);
}
static void
spa_io_history_destroy(spa_t *spa)
{
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
if (shk->kstat)
kstat_delete(shk->kstat);
mutex_destroy(&shk->lock);
}
/*
* ==========================================================================
* SPA MMP History Routines
@ -996,7 +948,6 @@ spa_stats_init(spa_t *spa)
spa_read_history_init(spa);
spa_txg_history_init(spa);
spa_tx_assign_init(spa);
spa_io_history_init(spa);
spa_mmp_history_init(spa);
spa_state_init(spa);
spa_iostats_init(spa);
@ -1010,7 +961,6 @@ spa_stats_destroy(spa_t *spa)
spa_tx_assign_destroy(spa);
spa_txg_history_destroy(spa);
spa_read_history_destroy(spa);
spa_io_history_destroy(spa);
spa_mmp_history_destroy(spa);
}

47
module/zfs/vdev_queue.c
View File

@ -35,8 +35,6 @@
#include <sys/dsl_pool.h>
#include <sys/metaslab_impl.h>
#include <sys/spa.h>
#include <sys/spa_impl.h>
#include <sys/kstat.h>
#include <sys/abd.h>
/*
@ -516,35 +514,17 @@ vdev_queue_fini(vdev_t *vd)
static void
vdev_queue_io_add(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
avl_add(vdev_queue_class_tree(vq, zio->io_priority), zio);
avl_add(vdev_queue_type_tree(vq, zio->io_type), zio);
if (shk->kstat != NULL) {
mutex_enter(&shk->lock);
kstat_waitq_enter(shk->kstat->ks_data);
mutex_exit(&shk->lock);
}
}
static void
vdev_queue_io_remove(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
avl_remove(vdev_queue_class_tree(vq, zio->io_priority), zio);
avl_remove(vdev_queue_type_tree(vq, zio->io_type), zio);
if (shk->kstat != NULL) {
mutex_enter(&shk->lock);
kstat_waitq_exit(shk->kstat->ks_data);
mutex_exit(&shk->lock);
}
}
static boolean_t
@ -564,9 +544,6 @@ vdev_queue_is_interactive(zio_priority_t p)
static void
vdev_queue_pending_add(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT(MUTEX_HELD(&vq->vq_lock));
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
vq->vq_class[zio->io_priority].vqc_active++;
@ -577,20 +554,11 @@ vdev_queue_pending_add(vdev_queue_t *vq, zio_t *zio)
vq->vq_nia_credit--;
}
avl_add(&vq->vq_active_tree, zio);
if (shk->kstat != NULL) {
mutex_enter(&shk->lock);
kstat_runq_enter(shk->kstat->ks_data);
mutex_exit(&shk->lock);
}
}
static void
vdev_queue_pending_remove(vdev_queue_t *vq, zio_t *zio)
{
spa_t *spa = zio->io_spa;
spa_history_kstat_t *shk = &spa->spa_stats.io_history;
ASSERT(MUTEX_HELD(&vq->vq_lock));
ASSERT3U(zio->io_priority, <, ZIO_PRIORITY_NUM_QUEUEABLE);
vq->vq_class[zio->io_priority].vqc_active--;
@ -602,21 +570,6 @@ vdev_queue_pending_remove(vdev_queue_t *vq, zio_t *zio)
} else if (vq->vq_ia_active == 0)
vq->vq_nia_credit++;
avl_remove(&vq->vq_active_tree, zio);
if (shk->kstat != NULL) {
kstat_io_t *ksio = shk->kstat->ks_data;
mutex_enter(&shk->lock);
kstat_runq_exit(ksio);
if (zio->io_type == ZIO_TYPE_READ) {
ksio->reads++;
ksio->nread += zio->io_size;
} else if (zio->io_type == ZIO_TYPE_WRITE) {
ksio->writes++;
ksio->nwritten += zio->io_size;
}
mutex_exit(&shk->lock);
}
}
static void