diff options
Diffstat (limited to 'module/zfs/spa_stats.c')
| -rw-r--r-- | module/zfs/spa_stats.c | 1047 |
1 files changed, 1047 insertions, 0 deletions
diff --git a/module/zfs/spa_stats.c b/module/zfs/spa_stats.c new file mode 100644 index 000000000..86cefa6dd --- /dev/null +++ b/module/zfs/spa_stats.c @@ -0,0 +1,1047 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (the "License"). + * You may not use this file except in compliance with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ + +#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 = 0; + +/* + * Include cache hits in history, disabled by default. + */ +int zfs_read_history_hits = 0; + +/* + * Keeps stats on the last 100 txgs by default. + */ +int zfs_txg_history = 100; + +/* + * Keeps stats on the last N MMP updates, disabled by default. + */ +int zfs_multihost_history = 0; + +/* + * ========================================================================== + * SPA Read History Routines + * ========================================================================== + */ + +/* + * Read statistics - Information exported regarding each arc_read call + */ +typedef struct spa_read_history { + hrtime_t start; /* time read completed */ + uint64_t objset; /* read from this objset */ + uint64_t object; /* read of this object number */ + uint64_t level; /* block's indirection level */ + uint64_t blkid; /* read of this block id */ + char origin[24]; /* read originated from here */ + 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 */ + procfs_list_node_t srh_node; +} spa_read_history_t; + +static int +spa_read_history_show_header(struct seq_file *f) +{ + seq_printf(f, "%-8s %-16s %-8s %-8s %-8s %-8s %-8s " + "%-24s %-8s %-16s\n", "UID", "start", "objset", "object", + "level", "blkid", "aflags", "origin", "pid", "process"); + + return (0); +} + +static int +spa_read_history_show(struct seq_file *f, void *data) +{ + spa_read_history_t *srh = (spa_read_history_t *)data; + + seq_printf(f, "%-8llu %-16llu 0x%-6llx " + "%-8lli %-8lli %-8lli 0x%-6x %-24s %-8i %-16s\n", + (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); +} + +/* 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_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--; + } + + if (size == 0) + ASSERT(list_is_empty(&shl->procfs_list.pl_list)); +} + +static int +spa_read_history_clear(procfs_list_t *procfs_list) +{ + 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_history_list_t *shl = &spa->spa_stats.read_history; + char *module; + + shl->size = 0; + + module = kmem_asprintf("zfs/%s", spa_name(spa)); + + shl->procfs_list.pl_private = shl; + procfs_list_install(module, + "reads", + 0600, + &shl->procfs_list, + spa_read_history_show, + spa_read_history_show_header, + spa_read_history_clear, + offsetof(spa_read_history_t, srh_node)); + + kmem_strfree(module); +} + +static void +spa_read_history_destroy(spa_t *spa) +{ + 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_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 && shl->size == 0) + return; + + if (zfs_read_history_hits == 0 && (aflags & ARC_FLAG_CACHED)) + return; + + 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->object = zb->zb_object; + srh->level = zb->zb_level; + srh->blkid = zb->zb_blkid; + srh->aflags = aflags; + srh->pid = getpid(); + + mutex_enter(&shl->procfs_list.pl_lock); + + procfs_list_add(&shl->procfs_list, srh); + shl->size++; + + spa_read_history_truncate(shl, zfs_read_history); + + mutex_exit(&shl->procfs_list.pl_lock); +} + +/* + * ========================================================================== + * SPA TXG History Routines + * ========================================================================== + */ + +/* + * Txg statistics - Information exported regarding each txg sync + */ + +typedef struct spa_txg_history { + uint64_t txg; /* txg id */ + txg_state_t state; /* active txg state */ + uint64_t nread; /* number of bytes read */ + uint64_t nwritten; /* number of bytes written */ + uint64_t reads; /* number of read operations */ + uint64_t writes; /* number of write operations */ + uint64_t ndirty; /* number of dirty bytes */ + hrtime_t times[TXG_STATE_COMMITTED]; /* completion times */ + procfs_list_node_t sth_node; +} spa_txg_history_t; + +static int +spa_txg_history_show_header(struct seq_file *f) +{ + 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_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; + char state; + + switch (sth->state) { + case TXG_STATE_BIRTH: state = 'B'; break; + case TXG_STATE_OPEN: state = 'O'; break; + case TXG_STATE_QUIESCED: state = 'Q'; break; + case TXG_STATE_WAIT_FOR_SYNC: state = 'W'; break; + case TXG_STATE_SYNCED: state = 'S'; break; + case TXG_STATE_COMMITTED: state = 'C'; break; + default: state = '?'; break; + } + + if (sth->times[TXG_STATE_OPEN]) + open = sth->times[TXG_STATE_OPEN] - + sth->times[TXG_STATE_BIRTH]; + + if (sth->times[TXG_STATE_QUIESCED]) + quiesce = sth->times[TXG_STATE_QUIESCED] - + sth->times[TXG_STATE_OPEN]; + + if (sth->times[TXG_STATE_WAIT_FOR_SYNC]) + wait = sth->times[TXG_STATE_WAIT_FOR_SYNC] - + sth->times[TXG_STATE_QUIESCED]; + + if (sth->times[TXG_STATE_SYNCED]) + sync = sth->times[TXG_STATE_SYNCED] - + sth->times[TXG_STATE_WAIT_FOR_SYNC]; + + 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, + (u_longlong_t)sth->nread, (u_longlong_t)sth->nwritten, + (u_longlong_t)sth->reads, (u_longlong_t)sth->writes, + (u_longlong_t)open, (u_longlong_t)quiesce, (u_longlong_t)wait, + (u_longlong_t)sync); + + return (0); +} + +/* 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_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 (size == 0) + ASSERT(list_is_empty(&shl->procfs_list.pl_list)); + +} + +static int +spa_txg_history_clear(procfs_list_t *procfs_list) +{ + 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_history_list_t *shl = &spa->spa_stats.txg_history; + char *module; + + shl->size = 0; + + module = kmem_asprintf("zfs/%s", spa_name(spa)); + + shl->procfs_list.pl_private = shl; + procfs_list_install(module, + "txgs", + 0644, + &shl->procfs_list, + spa_txg_history_show, + spa_txg_history_show_header, + spa_txg_history_clear, + offsetof(spa_txg_history_t, sth_node)); + + kmem_strfree(module); +} + +static void +spa_txg_history_destroy(spa_t *spa) +{ + 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); +} + +/* + * Add a new txg to historical record. + */ +void +spa_txg_history_add(spa_t *spa, uint64_t txg, hrtime_t birth_time) +{ + spa_history_list_t *shl = &spa->spa_stats.txg_history; + spa_txg_history_t *sth; + + if (zfs_txg_history == 0 && shl->size == 0) + return; + + 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(&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); +} + +/* + * Set txg state completion time and increment current state. + */ +int +spa_txg_history_set(spa_t *spa, uint64_t txg, txg_state_t completed_state, + hrtime_t completed_time) +{ + 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(&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++; + error = 0; + break; + } + } + mutex_exit(&shl->procfs_list.pl_lock); + + return (error); +} + +/* + * Set txg IO stats. + */ +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_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(&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; + sth->reads = reads; + sth->writes = writes; + sth->ndirty = ndirty; + error = 0; + break; + } + } + 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_CONFIG, FTAG, RW_READER); + vdev_get_stats(spa->spa_root_vdev, &ts->vs1); + spa_config_exit(spa, SCL_CONFIG, 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_CONFIG, FTAG, RW_READER); + vdev_get_stats(spa->spa_root_vdev, &ts->vs2); + spa_config_exit(spa, SCL_CONFIG, 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 + * ========================================================================== + */ + +/* + * Tx statistics - Information exported regarding dmu_tx_assign time. + */ + +/* + * When the kstat is written zero all buckets. When the kstat is read + * count the number of trailing buckets set to zero and update ks_ndata + * such that they are not output. + */ +static int +spa_tx_assign_update(kstat_t *ksp, int rw) +{ + spa_t *spa = ksp->ks_private; + spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram; + int i; + + if (rw == KSTAT_WRITE) { + for (i = 0; i < shk->count; i++) + ((kstat_named_t *)shk->priv)[i].value.ui64 = 0; + } + + for (i = shk->count; i > 0; i--) + if (((kstat_named_t *)shk->priv)[i-1].value.ui64 != 0) + break; + + ksp->ks_ndata = i; + ksp->ks_data_size = i * sizeof (kstat_named_t); + + return (0); +} + +static void +spa_tx_assign_init(spa_t *spa) +{ + spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram; + char *name; + kstat_named_t *ks; + kstat_t *ksp; + int i; + + mutex_init(&shk->lock, NULL, MUTEX_DEFAULT, NULL); + + shk->count = 42; /* power of two buckets for 1ns to 2,199s */ + shk->size = shk->count * sizeof (kstat_named_t); + shk->priv = kmem_alloc(shk->size, KM_SLEEP); + + name = kmem_asprintf("zfs/%s", spa_name(spa)); + + for (i = 0; i < shk->count; i++) { + ks = &((kstat_named_t *)shk->priv)[i]; + ks->data_type = KSTAT_DATA_UINT64; + ks->value.ui64 = 0; + (void) snprintf(ks->name, KSTAT_STRLEN, "%llu ns", + (u_longlong_t)1 << i); + } + + ksp = kstat_create(name, 0, "dmu_tx_assign", "misc", + KSTAT_TYPE_NAMED, 0, KSTAT_FLAG_VIRTUAL); + shk->kstat = ksp; + + if (ksp) { + ksp->ks_lock = &shk->lock; + ksp->ks_data = shk->priv; + 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); + } + kmem_strfree(name); +} + +static void +spa_tx_assign_destroy(spa_t *spa) +{ + spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram; + kstat_t *ksp; + + ksp = shk->kstat; + if (ksp) + kstat_delete(ksp); + + kmem_free(shk->priv, shk->size); + mutex_destroy(&shk->lock); +} + +void +spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs) +{ + spa_history_kstat_t *shk = &spa->spa_stats.tx_assign_histogram; + uint64_t idx = 0; + + while (((1ULL << idx) < nsecs) && (idx < shk->size - 1)) + idx++; + + 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 + * ========================================================================== + */ + +/* + * 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) + kmem_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", + 0644, + &shl->procfs_list, + spa_mmp_history_show, + spa_mmp_history_show_header, + spa_mmp_history_clear, + offsetof(spa_mmp_history_t, smh_node)); + + kmem_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 = kmem_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); + } + + kmem_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); +} + +static spa_iostats_t spa_iostats_template = { + { "trim_extents_written", KSTAT_DATA_UINT64 }, + { "trim_bytes_written", KSTAT_DATA_UINT64 }, + { "trim_extents_skipped", KSTAT_DATA_UINT64 }, + { "trim_bytes_skipped", KSTAT_DATA_UINT64 }, + { "trim_extents_failed", KSTAT_DATA_UINT64 }, + { "trim_bytes_failed", KSTAT_DATA_UINT64 }, + { "autotrim_extents_written", KSTAT_DATA_UINT64 }, + { "autotrim_bytes_written", KSTAT_DATA_UINT64 }, + { "autotrim_extents_skipped", KSTAT_DATA_UINT64 }, + { "autotrim_bytes_skipped", KSTAT_DATA_UINT64 }, + { "autotrim_extents_failed", KSTAT_DATA_UINT64 }, + { "autotrim_bytes_failed", KSTAT_DATA_UINT64 }, + { "simple_trim_extents_written", KSTAT_DATA_UINT64 }, + { "simple_trim_bytes_written", KSTAT_DATA_UINT64 }, + { "simple_trim_extents_skipped", KSTAT_DATA_UINT64 }, + { "simple_trim_bytes_skipped", KSTAT_DATA_UINT64 }, + { "simple_trim_extents_failed", KSTAT_DATA_UINT64 }, + { "simple_trim_bytes_failed", KSTAT_DATA_UINT64 }, +}; + +#define SPA_IOSTATS_ADD(stat, val) \ + atomic_add_64(&iostats->stat.value.ui64, (val)); + +void +spa_iostats_trim_add(spa_t *spa, trim_type_t type, + uint64_t extents_written, uint64_t bytes_written, + uint64_t extents_skipped, uint64_t bytes_skipped, + uint64_t extents_failed, uint64_t bytes_failed) +{ + spa_history_kstat_t *shk = &spa->spa_stats.iostats; + kstat_t *ksp = shk->kstat; + spa_iostats_t *iostats; + + if (ksp == NULL) + return; + + iostats = ksp->ks_data; + if (type == TRIM_TYPE_MANUAL) { + SPA_IOSTATS_ADD(trim_extents_written, extents_written); + SPA_IOSTATS_ADD(trim_bytes_written, bytes_written); + SPA_IOSTATS_ADD(trim_extents_skipped, extents_skipped); + SPA_IOSTATS_ADD(trim_bytes_skipped, bytes_skipped); + SPA_IOSTATS_ADD(trim_extents_failed, extents_failed); + SPA_IOSTATS_ADD(trim_bytes_failed, bytes_failed); + } else if (type == TRIM_TYPE_AUTO) { + SPA_IOSTATS_ADD(autotrim_extents_written, extents_written); + SPA_IOSTATS_ADD(autotrim_bytes_written, bytes_written); + SPA_IOSTATS_ADD(autotrim_extents_skipped, extents_skipped); + SPA_IOSTATS_ADD(autotrim_bytes_skipped, bytes_skipped); + SPA_IOSTATS_ADD(autotrim_extents_failed, extents_failed); + SPA_IOSTATS_ADD(autotrim_bytes_failed, bytes_failed); + } else { + SPA_IOSTATS_ADD(simple_trim_extents_written, extents_written); + SPA_IOSTATS_ADD(simple_trim_bytes_written, bytes_written); + SPA_IOSTATS_ADD(simple_trim_extents_skipped, extents_skipped); + SPA_IOSTATS_ADD(simple_trim_bytes_skipped, bytes_skipped); + SPA_IOSTATS_ADD(simple_trim_extents_failed, extents_failed); + SPA_IOSTATS_ADD(simple_trim_bytes_failed, bytes_failed); + } +} + +static int +spa_iostats_update(kstat_t *ksp, int rw) +{ + if (rw == KSTAT_WRITE) { + memcpy(ksp->ks_data, &spa_iostats_template, + sizeof (spa_iostats_t)); + } + + return (0); +} + +static void +spa_iostats_init(spa_t *spa) +{ + spa_history_kstat_t *shk = &spa->spa_stats.iostats; + + mutex_init(&shk->lock, NULL, MUTEX_DEFAULT, NULL); + + char *name = kmem_asprintf("zfs/%s", spa_name(spa)); + kstat_t *ksp = kstat_create(name, 0, "iostats", "misc", + KSTAT_TYPE_NAMED, sizeof (spa_iostats_t) / sizeof (kstat_named_t), + KSTAT_FLAG_VIRTUAL); + + shk->kstat = ksp; + if (ksp) { + int size = sizeof (spa_iostats_t); + ksp->ks_lock = &shk->lock; + ksp->ks_private = spa; + ksp->ks_update = spa_iostats_update; + ksp->ks_data = kmem_alloc(size, KM_SLEEP); + memcpy(ksp->ks_data, &spa_iostats_template, size); + kstat_install(ksp); + } + + kmem_strfree(name); +} + +static void +spa_iostats_destroy(spa_t *spa) +{ + spa_history_kstat_t *shk = &spa->spa_stats.iostats; + kstat_t *ksp = shk->kstat; + if (ksp) { + kmem_free(ksp->ks_data, sizeof (spa_iostats_t)); + kstat_delete(ksp); + } + + mutex_destroy(&shk->lock); +} + +void +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); +} + +void +spa_stats_destroy(spa_t *spa) +{ + spa_iostats_destroy(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) +/* CSTYLED */ +module_param(zfs_read_history, int, 0644); +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_param(zfs_txg_history, int, 0644); +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 |