#include <sys/zfs_context.h>
#include <sys/spa_impl.h>
+#include <sys/vdev_impl.h>
+#include <sys/spa.h>
+#include <zfs_comutil.h>
/*
* Keeps stats on last N reads per spa_t, disabled by default.
int zfs_read_history_hits = 0;
/*
- * Keeps stats on the last N txgs, disabled by default.
+ * Keeps stats on the last 100 txgs by default.
*/
-int zfs_txg_history = 0;
+int zfs_txg_history = 100;
+
+/*
+ * Keeps stats on the last N MMP updates, disabled by default.
+ */
+int zfs_multihost_history = 0;
/*
* ==========================================================================
* Read statistics - Information exported regarding each arc_read call
*/
typedef struct spa_read_history {
- uint64_t uid; /* unique identifier */
hrtime_t start; /* time read completed */
uint64_t objset; /* read from this objset */
uint64_t object; /* read of this object number */
uint32_t aflags; /* ARC flags (cached, prefetch, etc.) */
pid_t pid; /* PID of task doing read */
char comm[16]; /* process name of task doing read */
- list_node_t srh_link;
+ procfs_list_node_t srh_node;
} spa_read_history_t;
static int
-spa_read_history_headers(char *buf, size_t size)
+spa_read_history_show_header(struct seq_file *f)
{
- (void) snprintf(buf, size, "%-8s %-16s %-8s %-8s %-8s %-8s %-8s "
+ seq_printf(f, "%-8s %-16s %-8s %-8s %-8s %-8s %-8s "
"%-24s %-8s %-16s\n", "UID", "start", "objset", "object",
"level", "blkid", "aflags", "origin", "pid", "process");
}
static int
-spa_read_history_data(char *buf, size_t size, void *data)
+spa_read_history_show(struct seq_file *f, void *data)
{
spa_read_history_t *srh = (spa_read_history_t *)data;
- (void) snprintf(buf, size, "%-8llu %-16llu 0x%-6llx "
+ seq_printf(f, "%-8llu %-16llu 0x%-6llx "
"%-8lli %-8lli %-8lli 0x%-6x %-24s %-8i %-16s\n",
- (u_longlong_t)srh->uid, srh->start,
+ (u_longlong_t)srh->srh_node.pln_id, srh->start,
(longlong_t)srh->objset, (longlong_t)srh->object,
(longlong_t)srh->level, (longlong_t)srh->blkid,
srh->aflags, srh->origin, srh->pid, srh->comm);
return (0);
}
-/*
- * Calculate the address for the next spa_stats_history_t entry. The
- * ssh->lock will be held until ksp->ks_ndata entries are processed.
- */
-static void *
-spa_read_history_addr(kstat_t *ksp, loff_t n)
+/* Remove oldest elements from list until there are no more than 'size' left */
+static void
+spa_read_history_truncate(spa_history_list_t *shl, unsigned int size)
{
- spa_t *spa = ksp->ks_private;
- spa_stats_history_t *ssh = &spa->spa_stats.read_history;
-
- ASSERT(MUTEX_HELD(&ssh->lock));
-
- if (n == 0)
- ssh->private = list_tail(&ssh->list);
- else if (ssh->private)
- ssh->private = list_prev(&ssh->list, ssh->private);
+ spa_read_history_t *srh;
+ while (shl->size > size) {
+ srh = list_remove_head(&shl->procfs_list.pl_list);
+ ASSERT3P(srh, !=, NULL);
+ kmem_free(srh, sizeof (spa_read_history_t));
+ shl->size--;
+ }
- return (ssh->private);
+ if (size == 0)
+ ASSERT(list_is_empty(&shl->procfs_list.pl_list));
}
-/*
- * When the kstat is written discard all spa_read_history_t entires. The
- * ssh->lock will be held until ksp->ks_ndata entries are processed.
- */
static int
-spa_read_history_update(kstat_t *ksp, int rw)
+spa_read_history_clear(procfs_list_t *procfs_list)
{
- spa_t *spa = ksp->ks_private;
- spa_stats_history_t *ssh = &spa->spa_stats.read_history;
-
- if (rw == KSTAT_WRITE) {
- spa_read_history_t *srh;
-
- while ((srh = list_remove_head(&ssh->list))) {
- ssh->size--;
- kmem_free(srh, sizeof (spa_read_history_t));
- }
-
- ASSERT3U(ssh->size, ==, 0);
- }
-
- ksp->ks_ndata = ssh->size;
- ksp->ks_data_size = ssh->size * sizeof (spa_read_history_t);
-
+ spa_history_list_t *shl = procfs_list->pl_private;
+ mutex_enter(&procfs_list->pl_lock);
+ spa_read_history_truncate(shl, 0);
+ mutex_exit(&procfs_list->pl_lock);
return (0);
}
static void
spa_read_history_init(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.read_history;
- char name[KSTAT_STRLEN];
- kstat_t *ksp;
+ spa_history_list_t *shl = &spa->spa_stats.read_history;
+ char *module;
- mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
- list_create(&ssh->list, sizeof (spa_read_history_t),
- offsetof(spa_read_history_t, srh_link));
+ shl->size = 0;
- ssh->count = 0;
- ssh->size = 0;
- ssh->private = NULL;
+ module = kmem_asprintf("zfs/%s", spa_name(spa));
- (void) snprintf(name, KSTAT_STRLEN, "zfs/%s", spa_name(spa));
-
- ksp = kstat_create(name, 0, "reads", "misc",
- KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
- ssh->kstat = ksp;
+ shl->procfs_list.pl_private = shl;
+ procfs_list_install(module,
+ "reads",
+ &shl->procfs_list,
+ spa_read_history_show,
+ spa_read_history_show_header,
+ spa_read_history_clear,
+ offsetof(spa_read_history_t, srh_node));
- if (ksp) {
- ksp->ks_lock = &ssh->lock;
- ksp->ks_data = NULL;
- ksp->ks_private = spa;
- ksp->ks_update = spa_read_history_update;
- kstat_set_raw_ops(ksp, spa_read_history_headers,
- spa_read_history_data, spa_read_history_addr);
- kstat_install(ksp);
- }
+ strfree(module);
}
static void
spa_read_history_destroy(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.read_history;
- spa_read_history_t *srh;
- kstat_t *ksp;
-
- ksp = ssh->kstat;
- if (ksp)
- kstat_delete(ksp);
-
- mutex_enter(&ssh->lock);
- while ((srh = list_remove_head(&ssh->list))) {
- ssh->size--;
- kmem_free(srh, sizeof (spa_read_history_t));
- }
-
- ASSERT3U(ssh->size, ==, 0);
- list_destroy(&ssh->list);
- mutex_exit(&ssh->lock);
-
- mutex_destroy(&ssh->lock);
+ spa_history_list_t *shl = &spa->spa_stats.read_history;
+ procfs_list_uninstall(&shl->procfs_list);
+ spa_read_history_truncate(shl, 0);
+ procfs_list_destroy(&shl->procfs_list);
}
void
spa_read_history_add(spa_t *spa, const zbookmark_phys_t *zb, uint32_t aflags)
{
- spa_stats_history_t *ssh = &spa->spa_stats.read_history;
- spa_read_history_t *srh, *rm;
+ spa_history_list_t *shl = &spa->spa_stats.read_history;
+ spa_read_history_t *srh;
ASSERT3P(spa, !=, NULL);
ASSERT3P(zb, !=, NULL);
- if (zfs_read_history == 0 && ssh->size == 0)
+ if (zfs_read_history == 0 && shl->size == 0)
return;
- if (zfs_read_history_hits == 0 && (aflags & ARC_CACHED))
+ if (zfs_read_history_hits == 0 && (aflags & ARC_FLAG_CACHED))
return;
- srh = kmem_zalloc(sizeof (spa_read_history_t), KM_PUSHPAGE);
+ srh = kmem_zalloc(sizeof (spa_read_history_t), KM_SLEEP);
strlcpy(srh->comm, getcomm(), sizeof (srh->comm));
srh->start = gethrtime();
srh->objset = zb->zb_objset;
srh->aflags = aflags;
srh->pid = getpid();
- mutex_enter(&ssh->lock);
+ mutex_enter(&shl->procfs_list.pl_lock);
- srh->uid = ssh->count++;
- list_insert_head(&ssh->list, srh);
- ssh->size++;
+ procfs_list_add(&shl->procfs_list, srh);
+ shl->size++;
- while (ssh->size > zfs_read_history) {
- ssh->size--;
- rm = list_remove_tail(&ssh->list);
- kmem_free(rm, sizeof (spa_read_history_t));
- }
+ spa_read_history_truncate(shl, zfs_read_history);
- mutex_exit(&ssh->lock);
+ mutex_exit(&shl->procfs_list.pl_lock);
}
/*
uint64_t writes; /* number of write operations */
uint64_t ndirty; /* number of dirty bytes */
hrtime_t times[TXG_STATE_COMMITTED]; /* completion times */
- list_node_t sth_link;
+ procfs_list_node_t sth_node;
} spa_txg_history_t;
static int
-spa_txg_history_headers(char *buf, size_t size)
+spa_txg_history_show_header(struct seq_file *f)
{
- (void) snprintf(buf, size, "%-8s %-16s %-5s %-12s %-12s %-12s "
+ seq_printf(f, "%-8s %-16s %-5s %-12s %-12s %-12s "
"%-8s %-8s %-12s %-12s %-12s %-12s\n", "txg", "birth", "state",
"ndirty", "nread", "nwritten", "reads", "writes",
"otime", "qtime", "wtime", "stime");
-
return (0);
}
static int
-spa_txg_history_data(char *buf, size_t size, void *data)
+spa_txg_history_show(struct seq_file *f, void *data)
{
spa_txg_history_t *sth = (spa_txg_history_t *)data;
uint64_t open = 0, quiesce = 0, wait = 0, sync = 0;
sync = sth->times[TXG_STATE_SYNCED] -
sth->times[TXG_STATE_WAIT_FOR_SYNC];
- (void) snprintf(buf, size, "%-8llu %-16llu %-5c %-12llu "
+ seq_printf(f, "%-8llu %-16llu %-5c %-12llu "
"%-12llu %-12llu %-8llu %-8llu %-12llu %-12llu %-12llu %-12llu\n",
(longlong_t)sth->txg, sth->times[TXG_STATE_BIRTH], state,
(u_longlong_t)sth->ndirty,
return (0);
}
-/*
- * Calculate the address for the next spa_stats_history_t entry. The
- * ssh->lock will be held until ksp->ks_ndata entries are processed.
- */
-static void *
-spa_txg_history_addr(kstat_t *ksp, loff_t n)
+/* Remove oldest elements from list until there are no more than 'size' left */
+static void
+spa_txg_history_truncate(spa_history_list_t *shl, unsigned int size)
{
- spa_t *spa = ksp->ks_private;
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
-
- ASSERT(MUTEX_HELD(&ssh->lock));
+ spa_txg_history_t *sth;
+ while (shl->size > size) {
+ sth = list_remove_head(&shl->procfs_list.pl_list);
+ ASSERT3P(sth, !=, NULL);
+ kmem_free(sth, sizeof (spa_txg_history_t));
+ shl->size--;
+ }
- if (n == 0)
- ssh->private = list_tail(&ssh->list);
- else if (ssh->private)
- ssh->private = list_prev(&ssh->list, ssh->private);
+ if (size == 0)
+ ASSERT(list_is_empty(&shl->procfs_list.pl_list));
- return (ssh->private);
}
-/*
- * When the kstat is written discard all spa_txg_history_t entires. The
- * ssh->lock will be held until ksp->ks_ndata entries are processed.
- */
static int
-spa_txg_history_update(kstat_t *ksp, int rw)
+spa_txg_history_clear(procfs_list_t *procfs_list)
{
- spa_t *spa = ksp->ks_private;
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
-
- ASSERT(MUTEX_HELD(&ssh->lock));
-
- if (rw == KSTAT_WRITE) {
- spa_txg_history_t *sth;
-
- while ((sth = list_remove_head(&ssh->list))) {
- ssh->size--;
- kmem_free(sth, sizeof (spa_txg_history_t));
- }
-
- ASSERT3U(ssh->size, ==, 0);
- }
-
- ksp->ks_ndata = ssh->size;
- ksp->ks_data_size = ssh->size * sizeof (spa_txg_history_t);
-
+ spa_history_list_t *shl = procfs_list->pl_private;
+ mutex_enter(&procfs_list->pl_lock);
+ spa_txg_history_truncate(shl, 0);
+ mutex_exit(&procfs_list->pl_lock);
return (0);
}
static void
spa_txg_history_init(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
- char name[KSTAT_STRLEN];
- kstat_t *ksp;
+ spa_history_list_t *shl = &spa->spa_stats.txg_history;
+ char *module;
- mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
- list_create(&ssh->list, sizeof (spa_txg_history_t),
- offsetof(spa_txg_history_t, sth_link));
+ shl->size = 0;
- ssh->count = 0;
- ssh->size = 0;
- ssh->private = NULL;
+ module = kmem_asprintf("zfs/%s", spa_name(spa));
- (void) snprintf(name, KSTAT_STRLEN, "zfs/%s", spa_name(spa));
+ shl->procfs_list.pl_private = shl;
+ procfs_list_install(module,
+ "txgs",
+ &shl->procfs_list,
+ spa_txg_history_show,
+ spa_txg_history_show_header,
+ spa_txg_history_clear,
+ offsetof(spa_txg_history_t, sth_node));
- ksp = kstat_create(name, 0, "txgs", "misc",
- KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
- ssh->kstat = ksp;
-
- if (ksp) {
- ksp->ks_lock = &ssh->lock;
- ksp->ks_data = NULL;
- ksp->ks_private = spa;
- ksp->ks_update = spa_txg_history_update;
- kstat_set_raw_ops(ksp, spa_txg_history_headers,
- spa_txg_history_data, spa_txg_history_addr);
- kstat_install(ksp);
- }
+ strfree(module);
}
static void
spa_txg_history_destroy(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
- spa_txg_history_t *sth;
- kstat_t *ksp;
-
- ksp = ssh->kstat;
- if (ksp)
- kstat_delete(ksp);
-
- mutex_enter(&ssh->lock);
- while ((sth = list_remove_head(&ssh->list))) {
- ssh->size--;
- kmem_free(sth, sizeof (spa_txg_history_t));
- }
-
- ASSERT3U(ssh->size, ==, 0);
- list_destroy(&ssh->list);
- mutex_exit(&ssh->lock);
-
- mutex_destroy(&ssh->lock);
+ spa_history_list_t *shl = &spa->spa_stats.txg_history;
+ procfs_list_uninstall(&shl->procfs_list);
+ spa_txg_history_truncate(shl, 0);
+ procfs_list_destroy(&shl->procfs_list);
}
/*
void
spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time)
{
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
- spa_txg_history_t *sth, *rm;
+ spa_history_list_t *shl = &spa->spa_stats.txg_history;
+ spa_txg_history_t *sth;
- if (zfs_txg_history == 0 && ssh->size == 0)
+ if (zfs_txg_history == 0 && shl->size == 0)
return;
- sth = kmem_zalloc(sizeof (spa_txg_history_t), KM_PUSHPAGE);
+ sth = kmem_zalloc(sizeof (spa_txg_history_t), KM_SLEEP);
sth->txg = txg;
sth->state = TXG_STATE_OPEN;
sth->times[TXG_STATE_BIRTH] = birth_time;
- mutex_enter(&ssh->lock);
-
- list_insert_head(&ssh->list, sth);
- ssh->size++;
-
- while (ssh->size > zfs_txg_history) {
- ssh->size--;
- rm = list_remove_tail(&ssh->list);
- kmem_free(rm, sizeof (spa_txg_history_t));
- }
-
- mutex_exit(&ssh->lock);
+ mutex_enter(&shl->procfs_list.pl_lock);
+ procfs_list_add(&shl->procfs_list, sth);
+ shl->size++;
+ spa_txg_history_truncate(shl, zfs_txg_history);
+ mutex_exit(&shl->procfs_list.pl_lock);
}
/*
spa_txg_history_set(spa_t *spa, uint64_t txg, txg_state_t completed_state,
hrtime_t completed_time)
{
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
+ spa_history_list_t *shl = &spa->spa_stats.txg_history;
spa_txg_history_t *sth;
int error = ENOENT;
if (zfs_txg_history == 0)
return (0);
- mutex_enter(&ssh->lock);
- for (sth = list_head(&ssh->list); sth != NULL;
- sth = list_next(&ssh->list, sth)) {
+ mutex_enter(&shl->procfs_list.pl_lock);
+ for (sth = list_tail(&shl->procfs_list.pl_list); sth != NULL;
+ sth = list_prev(&shl->procfs_list.pl_list, sth)) {
if (sth->txg == txg) {
sth->times[completed_state] = completed_time;
sth->state++;
break;
}
}
- mutex_exit(&ssh->lock);
+ mutex_exit(&shl->procfs_list.pl_lock);
return (error);
}
/*
* Set txg IO stats.
*/
-int
+static int
spa_txg_history_set_io(spa_t *spa, uint64_t txg, uint64_t nread,
uint64_t nwritten, uint64_t reads, uint64_t writes, uint64_t ndirty)
{
- spa_stats_history_t *ssh = &spa->spa_stats.txg_history;
+ spa_history_list_t *shl = &spa->spa_stats.txg_history;
spa_txg_history_t *sth;
int error = ENOENT;
if (zfs_txg_history == 0)
return (0);
- mutex_enter(&ssh->lock);
- for (sth = list_head(&ssh->list); sth != NULL;
- sth = list_next(&ssh->list, sth)) {
+ mutex_enter(&shl->procfs_list.pl_lock);
+ for (sth = list_tail(&shl->procfs_list.pl_list); sth != NULL;
+ sth = list_prev(&shl->procfs_list.pl_list, sth)) {
if (sth->txg == txg) {
sth->nread = nread;
sth->nwritten = nwritten;
break;
}
}
- mutex_exit(&ssh->lock);
+ mutex_exit(&shl->procfs_list.pl_lock);
return (error);
}
+txg_stat_t *
+spa_txg_history_init_io(spa_t *spa, uint64_t txg, dsl_pool_t *dp)
+{
+ txg_stat_t *ts;
+
+ if (zfs_txg_history == 0)
+ return (NULL);
+
+ ts = kmem_alloc(sizeof (txg_stat_t), KM_SLEEP);
+
+ spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
+ vdev_get_stats(spa->spa_root_vdev, &ts->vs1);
+ spa_config_exit(spa, SCL_ALL, FTAG);
+
+ ts->txg = txg;
+ ts->ndirty = dp->dp_dirty_pertxg[txg & TXG_MASK];
+
+ spa_txg_history_set(spa, txg, TXG_STATE_WAIT_FOR_SYNC, gethrtime());
+
+ return (ts);
+}
+
+void
+spa_txg_history_fini_io(spa_t *spa, txg_stat_t *ts)
+{
+ if (ts == NULL)
+ return;
+
+ if (zfs_txg_history == 0) {
+ kmem_free(ts, sizeof (txg_stat_t));
+ return;
+ }
+
+ spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
+ vdev_get_stats(spa->spa_root_vdev, &ts->vs2);
+ spa_config_exit(spa, SCL_ALL, FTAG);
+
+ spa_txg_history_set(spa, ts->txg, TXG_STATE_SYNCED, gethrtime());
+ spa_txg_history_set_io(spa, ts->txg,
+ ts->vs2.vs_bytes[ZIO_TYPE_READ] - ts->vs1.vs_bytes[ZIO_TYPE_READ],
+ ts->vs2.vs_bytes[ZIO_TYPE_WRITE] - ts->vs1.vs_bytes[ZIO_TYPE_WRITE],
+ ts->vs2.vs_ops[ZIO_TYPE_READ] - ts->vs1.vs_ops[ZIO_TYPE_READ],
+ ts->vs2.vs_ops[ZIO_TYPE_WRITE] - ts->vs1.vs_ops[ZIO_TYPE_WRITE],
+ ts->ndirty);
+
+ kmem_free(ts, sizeof (txg_stat_t));
+}
+
/*
* ==========================================================================
* SPA TX Assign Histogram Routines
spa_tx_assign_update(kstat_t *ksp, int rw)
{
spa_t *spa = ksp->ks_private;
- spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
+ spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram;
int i;
if (rw == KSTAT_WRITE) {
- for (i = 0; i < ssh->count; i++)
- ((kstat_named_t *)ssh->private)[i].value.ui64 = 0;
+ for (i = 0; i < shk->count; i++)
+ ((kstat_named_t *)shk->private)[i].value.ui64 = 0;
}
- for (i = ssh->count; i > 0; i--)
- if (((kstat_named_t *)ssh->private)[i-1].value.ui64 != 0)
+ for (i = shk->count; i > 0; i--)
+ if (((kstat_named_t *)shk->private)[i-1].value.ui64 != 0)
break;
ksp->ks_ndata = i;
static void
spa_tx_assign_init(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
- char name[KSTAT_STRLEN];
+ spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram;
+ char *name;
kstat_named_t *ks;
kstat_t *ksp;
int i;
- mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&shk->lock, NULL, MUTEX_DEFAULT, NULL);
- ssh->count = 42; /* power of two buckets for 1ns to 2,199s */
- ssh->size = ssh->count * sizeof (kstat_named_t);
- ssh->private = kmem_alloc(ssh->size, KM_SLEEP);
+ shk->count = 42; /* power of two buckets for 1ns to 2,199s */
+ shk->size = shk->count * sizeof (kstat_named_t);
+ shk->private = kmem_alloc(shk->size, KM_SLEEP);
- (void) snprintf(name, KSTAT_STRLEN, "zfs/%s", spa_name(spa));
+ name = kmem_asprintf("zfs/%s", spa_name(spa));
- for (i = 0; i < ssh->count; i++) {
- ks = &((kstat_named_t *)ssh->private)[i];
+ for (i = 0; i < shk->count; i++) {
+ ks = &((kstat_named_t *)shk->private)[i];
ks->data_type = KSTAT_DATA_UINT64;
ks->value.ui64 = 0;
(void) snprintf(ks->name, KSTAT_STRLEN, "%llu ns",
ksp = kstat_create(name, 0, "dmu_tx_assign", "misc",
KSTAT_TYPE_NAMED, 0, KSTAT_FLAG_VIRTUAL);
- ssh->kstat = ksp;
+ shk->kstat = ksp;
if (ksp) {
- ksp->ks_lock = &ssh->lock;
- ksp->ks_data = ssh->private;
- ksp->ks_ndata = ssh->count;
- ksp->ks_data_size = ssh->size;
+ ksp->ks_lock = &shk->lock;
+ ksp->ks_data = shk->private;
+ ksp->ks_ndata = shk->count;
+ ksp->ks_data_size = shk->size;
ksp->ks_private = spa;
ksp->ks_update = spa_tx_assign_update;
kstat_install(ksp);
}
+ strfree(name);
}
static void
spa_tx_assign_destroy(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
+ spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram;
kstat_t *ksp;
- ksp = ssh->kstat;
+ ksp = shk->kstat;
if (ksp)
kstat_delete(ksp);
- kmem_free(ssh->private, ssh->size);
- mutex_destroy(&ssh->lock);
+ kmem_free(shk->private, shk->size);
+ mutex_destroy(&shk->lock);
}
void
spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs)
{
- spa_stats_history_t *ssh = &spa->spa_stats.tx_assign_histogram;
+ spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram;
uint64_t idx = 0;
- while (((1 << idx) < nsecs) && (idx < ssh->size - 1))
+ while (((1ULL << idx) < nsecs) && (idx < shk->size - 1))
idx++;
- atomic_inc_64(&((kstat_named_t *)ssh->private)[idx].value.ui64);
+ atomic_inc_64(&((kstat_named_t *)shk->private)[idx].value.ui64);
}
/*
static void
spa_io_history_init(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
- char name[KSTAT_STRLEN];
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
+ char *name;
kstat_t *ksp;
- mutex_init(&ssh->lock, NULL, MUTEX_DEFAULT, NULL);
+ mutex_init(&shk->lock, NULL, MUTEX_DEFAULT, NULL);
- (void) snprintf(name, KSTAT_STRLEN, "zfs/%s", spa_name(spa));
+ name = kmem_asprintf("zfs/%s", spa_name(spa));
ksp = kstat_create(name, 0, "io", "disk", KSTAT_TYPE_IO, 1, 0);
- ssh->kstat = ksp;
+ shk->kstat = ksp;
if (ksp) {
- ksp->ks_lock = &ssh->lock;
+ ksp->ks_lock = &shk->lock;
ksp->ks_private = spa;
ksp->ks_update = spa_io_history_update;
kstat_install(ksp);
}
+ strfree(name);
}
static void
spa_io_history_destroy(spa_t *spa)
{
- spa_stats_history_t *ssh = &spa->spa_stats.io_history;
+ spa_history_kstat_t *shk = &spa->spa_stats.io_history;
- if (ssh->kstat)
- kstat_delete(ssh->kstat);
+ if (shk->kstat)
+ kstat_delete(shk->kstat);
- mutex_destroy(&ssh->lock);
+ mutex_destroy(&shk->lock);
+}
+
+/*
+ * ==========================================================================
+ * SPA MMP History Routines
+ * ==========================================================================
+ */
+
+/*
+ * MMP statistics - Information exported regarding attempted MMP writes
+ * For MMP writes issued, fields used as per comments below.
+ * For MMP writes skipped, an entry represents a span of time when
+ * writes were skipped for same reason (error from mmp_random_leaf).
+ * Differences are:
+ * timestamp time first write skipped, if >1 skipped in a row
+ * mmp_delay delay value at timestamp
+ * vdev_guid number of writes skipped
+ * io_error one of enum mmp_error
+ * duration time span (ns) of skipped writes
+ */
+
+typedef struct spa_mmp_history {
+ uint64_t mmp_node_id; /* unique # for updates */
+ uint64_t txg; /* txg of last sync */
+ uint64_t timestamp; /* UTC time MMP write issued */
+ uint64_t mmp_delay; /* mmp_thread.mmp_delay at timestamp */
+ uint64_t vdev_guid; /* unique ID of leaf vdev */
+ char *vdev_path;
+ int vdev_label; /* vdev label */
+ int io_error; /* error status of MMP write */
+ hrtime_t error_start; /* hrtime of start of error period */
+ hrtime_t duration; /* time from submission to completion */
+ procfs_list_node_t smh_node;
+} spa_mmp_history_t;
+
+static int
+spa_mmp_history_show_header(struct seq_file *f)
+{
+ seq_printf(f, "%-10s %-10s %-10s %-6s %-10s %-12s %-24s "
+ "%-10s %s\n", "id", "txg", "timestamp", "error", "duration",
+ "mmp_delay", "vdev_guid", "vdev_label", "vdev_path");
+ return (0);
+}
+
+static int
+spa_mmp_history_show(struct seq_file *f, void *data)
+{
+ spa_mmp_history_t *smh = (spa_mmp_history_t *)data;
+ char skip_fmt[] = "%-10llu %-10llu %10llu %#6llx %10lld %12llu %-24llu "
+ "%-10lld %s\n";
+ char write_fmt[] = "%-10llu %-10llu %10llu %6lld %10lld %12llu %-24llu "
+ "%-10lld %s\n";
+
+ seq_printf(f, (smh->error_start ? skip_fmt : write_fmt),
+ (u_longlong_t)smh->mmp_node_id, (u_longlong_t)smh->txg,
+ (u_longlong_t)smh->timestamp, (longlong_t)smh->io_error,
+ (longlong_t)smh->duration, (u_longlong_t)smh->mmp_delay,
+ (u_longlong_t)smh->vdev_guid, (u_longlong_t)smh->vdev_label,
+ (smh->vdev_path ? smh->vdev_path : "-"));
+
+ return (0);
+}
+
+/* Remove oldest elements from list until there are no more than 'size' left */
+static void
+spa_mmp_history_truncate(spa_history_list_t *shl, unsigned int size)
+{
+ spa_mmp_history_t *smh;
+ while (shl->size > size) {
+ smh = list_remove_head(&shl->procfs_list.pl_list);
+ if (smh->vdev_path)
+ strfree(smh->vdev_path);
+ kmem_free(smh, sizeof (spa_mmp_history_t));
+ shl->size--;
+ }
+
+ if (size == 0)
+ ASSERT(list_is_empty(&shl->procfs_list.pl_list));
+
+}
+
+static int
+spa_mmp_history_clear(procfs_list_t *procfs_list)
+{
+ spa_history_list_t *shl = procfs_list->pl_private;
+ mutex_enter(&procfs_list->pl_lock);
+ spa_mmp_history_truncate(shl, 0);
+ mutex_exit(&procfs_list->pl_lock);
+ return (0);
+}
+
+static void
+spa_mmp_history_init(spa_t *spa)
+{
+ spa_history_list_t *shl = &spa->spa_stats.mmp_history;
+ char *module;
+
+ shl->size = 0;
+
+ module = kmem_asprintf("zfs/%s", spa_name(spa));
+
+ shl->procfs_list.pl_private = shl;
+ procfs_list_install(module,
+ "multihost",
+ &shl->procfs_list,
+ spa_mmp_history_show,
+ spa_mmp_history_show_header,
+ spa_mmp_history_clear,
+ offsetof(spa_mmp_history_t, smh_node));
+
+ strfree(module);
+}
+
+static void
+spa_mmp_history_destroy(spa_t *spa)
+{
+ spa_history_list_t *shl = &spa->spa_stats.mmp_history;
+ procfs_list_uninstall(&shl->procfs_list);
+ spa_mmp_history_truncate(shl, 0);
+ procfs_list_destroy(&shl->procfs_list);
+}
+
+/*
+ * Set duration in existing "skip" record to how long we have waited for a leaf
+ * vdev to become available.
+ *
+ * Important that we start search at the tail of the list where new
+ * records are inserted, so this is normally an O(1) operation.
+ */
+int
+spa_mmp_history_set_skip(spa_t *spa, uint64_t mmp_node_id)
+{
+ spa_history_list_t *shl = &spa->spa_stats.mmp_history;
+ spa_mmp_history_t *smh;
+ int error = ENOENT;
+
+ if (zfs_multihost_history == 0 && shl->size == 0)
+ return (0);
+
+ mutex_enter(&shl->procfs_list.pl_lock);
+ for (smh = list_tail(&shl->procfs_list.pl_list); smh != NULL;
+ smh = list_prev(&shl->procfs_list.pl_list, smh)) {
+ if (smh->mmp_node_id == mmp_node_id) {
+ ASSERT3U(smh->io_error, !=, 0);
+ smh->duration = gethrtime() - smh->error_start;
+ smh->vdev_guid++;
+ error = 0;
+ break;
+ }
+ }
+ mutex_exit(&shl->procfs_list.pl_lock);
+
+ return (error);
+}
+
+/*
+ * Set MMP write duration and error status in existing record.
+ * See comment re: search order above spa_mmp_history_set_skip().
+ */
+int
+spa_mmp_history_set(spa_t *spa, uint64_t mmp_node_id, int io_error,
+ hrtime_t duration)
+{
+ spa_history_list_t *shl = &spa->spa_stats.mmp_history;
+ spa_mmp_history_t *smh;
+ int error = ENOENT;
+
+ if (zfs_multihost_history == 0 && shl->size == 0)
+ return (0);
+
+ mutex_enter(&shl->procfs_list.pl_lock);
+ for (smh = list_tail(&shl->procfs_list.pl_list); smh != NULL;
+ smh = list_prev(&shl->procfs_list.pl_list, smh)) {
+ if (smh->mmp_node_id == mmp_node_id) {
+ ASSERT(smh->io_error == 0);
+ smh->io_error = io_error;
+ smh->duration = duration;
+ error = 0;
+ break;
+ }
+ }
+ mutex_exit(&shl->procfs_list.pl_lock);
+
+ return (error);
+}
+
+/*
+ * Add a new MMP historical record.
+ * error == 0 : a write was issued.
+ * error != 0 : a write was not issued because no leaves were found.
+ */
+void
+spa_mmp_history_add(spa_t *spa, uint64_t txg, uint64_t timestamp,
+ uint64_t mmp_delay, vdev_t *vd, int label, uint64_t mmp_node_id,
+ int error)
+{
+ spa_history_list_t *shl = &spa->spa_stats.mmp_history;
+ spa_mmp_history_t *smh;
+
+ if (zfs_multihost_history == 0 && shl->size == 0)
+ return;
+
+ smh = kmem_zalloc(sizeof (spa_mmp_history_t), KM_SLEEP);
+ smh->txg = txg;
+ smh->timestamp = timestamp;
+ smh->mmp_delay = mmp_delay;
+ if (vd) {
+ smh->vdev_guid = vd->vdev_guid;
+ if (vd->vdev_path)
+ smh->vdev_path = strdup(vd->vdev_path);
+ }
+ smh->vdev_label = label;
+ smh->mmp_node_id = mmp_node_id;
+
+ if (error) {
+ smh->io_error = error;
+ smh->error_start = gethrtime();
+ smh->vdev_guid = 1;
+ }
+
+ mutex_enter(&shl->procfs_list.pl_lock);
+ procfs_list_add(&shl->procfs_list, smh);
+ shl->size++;
+ spa_mmp_history_truncate(shl, zfs_multihost_history);
+ mutex_exit(&shl->procfs_list.pl_lock);
+}
+
+static void *
+spa_state_addr(kstat_t *ksp, loff_t n)
+{
+ return (ksp->ks_private); /* return the spa_t */
+}
+
+static int
+spa_state_data(char *buf, size_t size, void *data)
+{
+ spa_t *spa = (spa_t *)data;
+ (void) snprintf(buf, size, "%s\n", spa_state_to_name(spa));
+ return (0);
+}
+
+/*
+ * Return the state of the pool in /proc/spl/kstat/zfs/<pool>/state.
+ *
+ * This is a lock-less read of the pool's state (unlike using 'zpool', which
+ * can potentially block for seconds). Because it doesn't block, it can useful
+ * as a pool heartbeat value.
+ */
+static void
+spa_state_init(spa_t *spa)
+{
+ spa_history_kstat_t *shk = &spa->spa_stats.state;
+ 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, "state", "misc",
+ KSTAT_TYPE_RAW, 0, KSTAT_FLAG_VIRTUAL);
+
+ shk->kstat = ksp;
+ if (ksp) {
+ ksp->ks_lock = &shk->lock;
+ ksp->ks_data = NULL;
+ ksp->ks_private = spa;
+ ksp->ks_flags |= KSTAT_FLAG_NO_HEADERS;
+ kstat_set_raw_ops(ksp, NULL, spa_state_data, spa_state_addr);
+ kstat_install(ksp);
+ }
+
+ strfree(name);
+}
+
+static void
+spa_health_destroy(spa_t *spa)
+{
+ spa_history_kstat_t *shk = &spa->spa_stats.state;
+ kstat_t *ksp = shk->kstat;
+ if (ksp)
+ kstat_delete(ksp);
+
+ mutex_destroy(&shk->lock);
}
void
spa_txg_history_init(spa);
spa_tx_assign_init(spa);
spa_io_history_init(spa);
+ spa_mmp_history_init(spa);
+ spa_state_init(spa);
}
void
spa_stats_destroy(spa_t *spa)
{
+ spa_health_destroy(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);
}
-#if defined(_KERNEL) && defined(HAVE_SPL)
+#if defined(_KERNEL)
+/* CSTYLED */
module_param(zfs_read_history, int, 0644);
-MODULE_PARM_DESC(zfs_read_history, "Historic statistics for the last N reads");
+MODULE_PARM_DESC(zfs_read_history,
+ "Historical statistics for the last N reads");
module_param(zfs_read_history_hits, int, 0644);
-MODULE_PARM_DESC(zfs_read_history_hits, "Include cache hits in read history");
+MODULE_PARM_DESC(zfs_read_history_hits,
+ "Include cache hits in read history");
module_param(zfs_txg_history, int, 0644);
-MODULE_PARM_DESC(zfs_txg_history, "Historic statistics for the last N txgs");
+MODULE_PARM_DESC(zfs_txg_history,
+ "Historical statistics for the last N txgs");
+
+module_param(zfs_multihost_history, int, 0644);
+MODULE_PARM_DESC(zfs_multihost_history,
+ "Historical statistics for last N multihost writes");
+/* END CSTYLED */
#endif
projects / mirror_zfs.git / blobdiff