svn commit: r365346 - in vendor-sys/openzfs/dist/module: os/freebsd/zfs os/linux/zfs zfs
Matt Macy
mmacy at FreeBSD.org
Fri Sep 4 22:11:59 UTC 2020
Author: mmacy
Date: Fri Sep 4 22:11:58 2020
New Revision: 365346
URL: https://svnweb.freebsd.org/changeset/base/365346
Log:
make spa_stats.c common
Added:
vendor-sys/openzfs/dist/module/zfs/spa_stats.c
- copied unchanged from r365345, vendor-sys/openzfs/dist/module/os/linux/zfs/spa_stats.c
Deleted:
vendor-sys/openzfs/dist/module/os/freebsd/zfs/spa_stats.c
vendor-sys/openzfs/dist/module/os/linux/zfs/spa_stats.c
Copied: vendor-sys/openzfs/dist/module/zfs/spa_stats.c (from r365345, vendor-sys/openzfs/dist/module/os/linux/zfs/spa_stats.c)
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ vendor-sys/openzfs/dist/module/zfs/spa_stats.c Fri Sep 4 22:11:58 2020 (r365346, copy of r365345, vendor-sys/openzfs/dist/module/os/linux/zfs/spa_stats.c)
@@ -0,0 +1,1043 @@
+/*
+ * 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)
+{
+ if (n == 0)
+ return (ksp->ks_private); /* return the spa_t */
+ return (NULL);
+}
+
+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;
*** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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