*/
/*
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
- * Copyright (c) 2011 by Delphix. All rights reserved.
+ * Copyright (c) 2012 by Delphix. All rights reserved.
*/
#include <sys/dsl_pool.h>
#include <sys/zfs_znode.h>
#include <sys/spa_impl.h>
#include <sys/dsl_deadlist.h>
+#include <sys/bptree.h>
+#include <sys/zfeature.h>
+#include <sys/zil_impl.h>
int zfs_no_write_throttle = 0;
int zfs_write_limit_shift = 3; /* 1/8th of physical memory */
int zfs_txg_synctime_ms = 1000; /* target millisecs to sync a txg */
+int zfs_txg_history = 60; /* statistics for the last N txgs */
unsigned long zfs_write_limit_min = 32 << 20; /* min write limit is 32MB */
unsigned long zfs_write_limit_max = 0; /* max data payload per txg */
static pgcnt_t old_physmem = 0;
+static void
+dsl_pool_tx_assign_init(dsl_pool_t *dp, unsigned int ndata)
+{
+ kstat_named_t *ks;
+ char name[KSTAT_STRLEN];
+ int i, data_size = ndata * sizeof(kstat_named_t);
+
+ (void) snprintf(name, KSTAT_STRLEN, "dmu_tx_assign-%s",
+ spa_name(dp->dp_spa));
+
+ dp->dp_tx_assign_size = ndata;
+
+ if (data_size)
+ dp->dp_tx_assign_buckets = kmem_alloc(data_size, KM_SLEEP);
+ else
+ dp->dp_tx_assign_buckets = NULL;
+
+ for (i = 0; i < dp->dp_tx_assign_size; i++) {
+ ks = &dp->dp_tx_assign_buckets[i];
+ ks->data_type = KSTAT_DATA_UINT64;
+ ks->value.ui64 = 0;
+ (void) snprintf(ks->name, KSTAT_STRLEN, "%u us", 1 << i);
+ }
+
+ dp->dp_tx_assign_kstat = kstat_create("zfs", 0, name, "misc",
+ KSTAT_TYPE_NAMED, 0, KSTAT_FLAG_VIRTUAL);
+
+ if (dp->dp_tx_assign_kstat) {
+ dp->dp_tx_assign_kstat->ks_data = dp->dp_tx_assign_buckets;
+ dp->dp_tx_assign_kstat->ks_ndata = dp->dp_tx_assign_size;
+ dp->dp_tx_assign_kstat->ks_data_size = data_size;
+ kstat_install(dp->dp_tx_assign_kstat);
+ }
+}
+
+static void
+dsl_pool_tx_assign_destroy(dsl_pool_t *dp)
+{
+ if (dp->dp_tx_assign_buckets)
+ kmem_free(dp->dp_tx_assign_buckets,
+ dp->dp_tx_assign_size * sizeof(kstat_named_t));
+
+ if (dp->dp_tx_assign_kstat)
+ kstat_delete(dp->dp_tx_assign_kstat);
+}
+
+void
+dsl_pool_tx_assign_add_usecs(dsl_pool_t *dp, uint64_t usecs)
+{
+ uint64_t idx = 0;
+
+ while (((1 << idx) < usecs) && (idx < dp->dp_tx_assign_size - 1))
+ idx++;
+
+ atomic_inc_64(&dp->dp_tx_assign_buckets[idx].value.ui64);
+}
+
+static int
+dsl_pool_txg_history_update(kstat_t *ksp, int rw)
+{
+ dsl_pool_t *dp = ksp->ks_private;
+ txg_history_t *th;
+ int i = 0;
+
+ if (rw == KSTAT_WRITE)
+ return (EACCES);
+
+ if (ksp->ks_data)
+ kmem_free(ksp->ks_data, ksp->ks_data_size);
+
+ mutex_enter(&dp->dp_lock);
+
+ ksp->ks_ndata = dp->dp_txg_history_size;
+ ksp->ks_data_size = dp->dp_txg_history_size * sizeof(kstat_txg_t);
+ if (ksp->ks_data_size > 0)
+ ksp->ks_data = kmem_alloc(ksp->ks_data_size, KM_PUSHPAGE);
+
+ /* Traversed oldest to youngest for the most readable kstat output */
+ for (th = list_tail(&dp->dp_txg_history); th != NULL;
+ th = list_prev(&dp->dp_txg_history, th)) {
+ mutex_enter(&th->th_lock);
+ ASSERT3S(i + sizeof(kstat_txg_t), <=, ksp->ks_data_size);
+ memcpy(ksp->ks_data + i, &th->th_kstat, sizeof(kstat_txg_t));
+ i += sizeof(kstat_txg_t);
+ mutex_exit(&th->th_lock);
+ }
+
+ mutex_exit(&dp->dp_lock);
+
+ return (0);
+}
+
+static void
+dsl_pool_txg_history_init(dsl_pool_t *dp, uint64_t txg)
+{
+ char name[KSTAT_STRLEN];
+
+ list_create(&dp->dp_txg_history, sizeof (txg_history_t),
+ offsetof(txg_history_t, th_link));
+ dsl_pool_txg_history_add(dp, txg);
+
+ (void) snprintf(name, KSTAT_STRLEN, "txgs-%s", spa_name(dp->dp_spa));
+ dp->dp_txg_kstat = kstat_create("zfs", 0, name, "misc",
+ KSTAT_TYPE_TXG, 0, KSTAT_FLAG_VIRTUAL);
+ if (dp->dp_txg_kstat) {
+ dp->dp_txg_kstat->ks_data = NULL;
+ dp->dp_txg_kstat->ks_private = dp;
+ dp->dp_txg_kstat->ks_update = dsl_pool_txg_history_update;
+ kstat_install(dp->dp_txg_kstat);
+ }
+}
+
+static void
+dsl_pool_txg_history_destroy(dsl_pool_t *dp)
+{
+ txg_history_t *th;
+
+ if (dp->dp_txg_kstat) {
+ if (dp->dp_txg_kstat->ks_data)
+ kmem_free(dp->dp_txg_kstat->ks_data,
+ dp->dp_txg_kstat->ks_data_size);
+
+ kstat_delete(dp->dp_txg_kstat);
+ }
+
+ mutex_enter(&dp->dp_lock);
+ while ((th = list_remove_head(&dp->dp_txg_history))) {
+ dp->dp_txg_history_size--;
+ mutex_destroy(&th->th_lock);
+ kmem_free(th, sizeof(txg_history_t));
+ }
+
+ ASSERT3U(dp->dp_txg_history_size, ==, 0);
+ list_destroy(&dp->dp_txg_history);
+ mutex_exit(&dp->dp_lock);
+}
+
+txg_history_t *
+dsl_pool_txg_history_add(dsl_pool_t *dp, uint64_t txg)
+{
+ txg_history_t *th, *rm;
+
+ th = kmem_zalloc(sizeof(txg_history_t), KM_PUSHPAGE);
+ mutex_init(&th->th_lock, NULL, MUTEX_DEFAULT, NULL);
+ th->th_kstat.txg = txg;
+ th->th_kstat.state = TXG_STATE_OPEN;
+ th->th_kstat.birth = gethrtime();
+
+ mutex_enter(&dp->dp_lock);
+
+ list_insert_head(&dp->dp_txg_history, th);
+ dp->dp_txg_history_size++;
+
+ while (dp->dp_txg_history_size > zfs_txg_history) {
+ dp->dp_txg_history_size--;
+ rm = list_remove_tail(&dp->dp_txg_history);
+ mutex_destroy(&rm->th_lock);
+ kmem_free(rm, sizeof(txg_history_t));
+ }
+
+ mutex_exit(&dp->dp_lock);
+
+ return (th);
+}
+
+/*
+ * Traversed youngest to oldest because lookups are only done for open
+ * or syncing txgs which are guaranteed to be at the head of the list.
+ * The txg_history_t structure will be returned locked.
+ */
+txg_history_t *
+dsl_pool_txg_history_get(dsl_pool_t *dp, uint64_t txg)
+{
+ txg_history_t *th;
+
+ mutex_enter(&dp->dp_lock);
+ for (th = list_head(&dp->dp_txg_history); th != NULL;
+ th = list_next(&dp->dp_txg_history, th)) {
+ if (th->th_kstat.txg == txg) {
+ mutex_enter(&th->th_lock);
+ break;
+ }
+ }
+ mutex_exit(&dp->dp_lock);
+
+ return (th);
+}
+
+void
+dsl_pool_txg_history_put(txg_history_t *th)
+{
+ mutex_exit(&th->th_lock);
+}
+
int
dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **ddp)
{
txg_list_create(&dp->dp_dirty_datasets,
offsetof(dsl_dataset_t, ds_dirty_link));
+ txg_list_create(&dp->dp_dirty_zilogs,
+ offsetof(zilog_t, zl_dirty_link));
txg_list_create(&dp->dp_dirty_dirs,
offsetof(dsl_dir_t, dd_dirty_link));
txg_list_create(&dp->dp_sync_tasks,
offsetof(dsl_sync_task_group_t, dstg_node));
- list_create(&dp->dp_synced_datasets, sizeof (dsl_dataset_t),
- offsetof(dsl_dataset_t, ds_synced_link));
mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL);
dp->dp_iput_taskq = taskq_create("zfs_iput_taskq", 1, minclsyspri,
1, 4, 0);
+ dsl_pool_txg_history_init(dp, txg);
+ dsl_pool_tx_assign_init(dp, 32);
+
return (dp);
}
int
-dsl_pool_open(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
+dsl_pool_init(spa_t *spa, uint64_t txg, dsl_pool_t **dpp)
{
int err;
dsl_pool_t *dp = dsl_pool_open_impl(spa, txg);
+
+ err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp,
+ &dp->dp_meta_objset);
+ if (err != 0)
+ dsl_pool_close(dp);
+ else
+ *dpp = dp;
+
+ return (err);
+}
+
+int
+dsl_pool_open(dsl_pool_t *dp)
+{
+ int err;
dsl_dir_t *dd;
dsl_dataset_t *ds;
uint64_t obj;
rw_enter(&dp->dp_config_rwlock, RW_WRITER);
- err = dmu_objset_open_impl(spa, NULL, &dp->dp_meta_rootbp,
- &dp->dp_meta_objset);
- if (err)
- goto out;
-
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_ROOT_DATASET, sizeof (uint64_t), 1,
&dp->dp_root_dir_obj);
if (err)
goto out;
- if (spa_version(spa) >= SPA_VERSION_ORIGIN) {
+ if (spa_version(dp->dp_spa) >= SPA_VERSION_ORIGIN) {
err = dsl_pool_open_special_dir(dp, ORIGIN_DIR_NAME, &dd);
if (err)
goto out;
goto out;
}
- if (spa_version(spa) >= SPA_VERSION_DEADLISTS) {
+ if (spa_version(dp->dp_spa) >= SPA_VERSION_DEADLISTS) {
err = dsl_pool_open_special_dir(dp, FREE_DIR_NAME,
&dp->dp_free_dir);
if (err)
dp->dp_meta_objset, obj));
}
+ if (spa_feature_is_active(dp->dp_spa,
+ &spa_feature_table[SPA_FEATURE_ASYNC_DESTROY])) {
+ err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_BPTREE_OBJ, sizeof (uint64_t), 1,
+ &dp->dp_bptree_obj);
+ if (err != 0)
+ goto out;
+ }
+
+ if (spa_feature_is_active(dp->dp_spa,
+ &spa_feature_table[SPA_FEATURE_EMPTY_BPOBJ])) {
+ err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
+ DMU_POOL_EMPTY_BPOBJ, sizeof (uint64_t), 1,
+ &dp->dp_empty_bpobj);
+ if (err != 0)
+ goto out;
+ }
+
err = zap_lookup(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_POOL_TMP_USERREFS, sizeof (uint64_t), 1,
&dp->dp_tmp_userrefs_obj);
if (err)
goto out;
- err = dsl_scan_init(dp, txg);
+ err = dsl_scan_init(dp, dp->dp_tx.tx_open_txg);
out:
rw_exit(&dp->dp_config_rwlock);
- if (err)
- dsl_pool_close(dp);
- else
- *dpp = dp;
-
return (err);
}
dmu_objset_evict(dp->dp_meta_objset);
txg_list_destroy(&dp->dp_dirty_datasets);
+ txg_list_destroy(&dp->dp_dirty_zilogs);
txg_list_destroy(&dp->dp_sync_tasks);
txg_list_destroy(&dp->dp_dirty_dirs);
- list_destroy(&dp->dp_synced_datasets);
arc_flush(dp->dp_spa);
txg_fini(dp);
dsl_scan_fini(dp);
+ dsl_pool_tx_assign_destroy(dp);
+ dsl_pool_txg_history_destroy(dp);
rw_destroy(&dp->dp_config_rwlock);
mutex_destroy(&dp->dp_lock);
taskq_destroy(dp->dp_iput_taskq);
/* create the pool directory */
err = zap_create_claim(dp->dp_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
DMU_OT_OBJECT_DIRECTORY, DMU_OT_NONE, 0, tx);
- ASSERT3U(err, ==, 0);
+ ASSERT0(err);
/* Initialize scan structures */
VERIFY3U(0, ==, dsl_scan_init(dp, txg));
return (dp);
}
+/*
+ * Account for the meta-objset space in its placeholder dsl_dir.
+ */
+void
+dsl_pool_mos_diduse_space(dsl_pool_t *dp,
+ int64_t used, int64_t comp, int64_t uncomp)
+{
+ ASSERT3U(comp, ==, uncomp); /* it's all metadata */
+ mutex_enter(&dp->dp_lock);
+ dp->dp_mos_used_delta += used;
+ dp->dp_mos_compressed_delta += comp;
+ dp->dp_mos_uncompressed_delta += uncomp;
+ mutex_exit(&dp->dp_lock);
+}
+
static int
deadlist_enqueue_cb(void *arg, const blkptr_t *bp, dmu_tx_t *tx)
{
dmu_tx_t *tx;
dsl_dir_t *dd;
dsl_dataset_t *ds;
- dsl_sync_task_group_t *dstg;
objset_t *mos = dp->dp_meta_objset;
hrtime_t start, write_time;
uint64_t data_written;
int err;
+ list_t synced_datasets;
+
+ list_create(&synced_datasets, sizeof (dsl_dataset_t),
+ offsetof(dsl_dataset_t, ds_synced_link));
/*
* We need to copy dp_space_towrite() before doing
* may sync newly-created datasets on pass 2.
*/
ASSERT(!list_link_active(&ds->ds_synced_link));
- list_insert_tail(&dp->dp_synced_datasets, ds);
+ list_insert_tail(&synced_datasets, ds);
dsl_dataset_sync(ds, zio, tx);
}
DTRACE_PROBE(pool_sync__1setup);
ASSERT(err == 0);
DTRACE_PROBE(pool_sync__2rootzio);
- for (ds = list_head(&dp->dp_synced_datasets); ds;
- ds = list_next(&dp->dp_synced_datasets, ds))
+ /*
+ * After the data blocks have been written (ensured by the zio_wait()
+ * above), update the user/group space accounting.
+ */
+ for (ds = list_head(&synced_datasets); ds;
+ ds = list_next(&synced_datasets, ds))
dmu_objset_do_userquota_updates(ds->ds_objset, tx);
/*
* Sync the datasets again to push out the changes due to
* userspace updates. This must be done before we process the
- * sync tasks, because that could cause a snapshot of a dataset
- * whose ds_bp will be rewritten when we do this 2nd sync.
+ * sync tasks, so that any snapshots will have the correct
+ * user accounting information (and we won't get confused
+ * about which blocks are part of the snapshot).
*/
zio = zio_root(dp->dp_spa, NULL, NULL, ZIO_FLAG_MUSTSUCCEED);
while ((ds = txg_list_remove(&dp->dp_dirty_datasets, txg))) {
err = zio_wait(zio);
/*
- * Move dead blocks from the pending deadlist to the on-disk
- * deadlist.
+ * Now that the datasets have been completely synced, we can
+ * clean up our in-memory structures accumulated while syncing:
+ *
+ * - move dead blocks from the pending deadlist to the on-disk deadlist
+ * - clean up zil records
+ * - release hold from dsl_dataset_dirty()
*/
- for (ds = list_head(&dp->dp_synced_datasets); ds;
- ds = list_next(&dp->dp_synced_datasets, ds)) {
+ while ((ds = list_remove_head(&synced_datasets))) {
+ ASSERTV(objset_t *os = ds->ds_objset);
bplist_iterate(&ds->ds_pending_deadlist,
deadlist_enqueue_cb, &ds->ds_deadlist, tx);
+ ASSERT(!dmu_objset_is_dirty(os, txg));
+ dmu_buf_rele(ds->ds_dbuf, ds);
}
- while ((dstg = txg_list_remove(&dp->dp_sync_tasks, txg))) {
- /*
- * No more sync tasks should have been added while we
- * were syncing.
- */
- ASSERT(spa_sync_pass(dp->dp_spa) == 1);
- dsl_sync_task_group_sync(dstg, tx);
- }
- DTRACE_PROBE(pool_sync__3task);
-
start = gethrtime();
while ((dd = txg_list_remove(&dp->dp_dirty_dirs, txg)))
dsl_dir_sync(dd, tx);
write_time += gethrtime() - start;
+ /*
+ * The MOS's space is accounted for in the pool/$MOS
+ * (dp_mos_dir). We can't modify the mos while we're syncing
+ * it, so we remember the deltas and apply them here.
+ */
+ if (dp->dp_mos_used_delta != 0 || dp->dp_mos_compressed_delta != 0 ||
+ dp->dp_mos_uncompressed_delta != 0) {
+ dsl_dir_diduse_space(dp->dp_mos_dir, DD_USED_HEAD,
+ dp->dp_mos_used_delta,
+ dp->dp_mos_compressed_delta,
+ dp->dp_mos_uncompressed_delta, tx);
+ dp->dp_mos_used_delta = 0;
+ dp->dp_mos_compressed_delta = 0;
+ dp->dp_mos_uncompressed_delta = 0;
+ }
+
start = gethrtime();
if (list_head(&mos->os_dirty_dnodes[txg & TXG_MASK]) != NULL ||
list_head(&mos->os_free_dnodes[txg & TXG_MASK]) != NULL) {
hrtime_t, dp->dp_read_overhead);
write_time -= dp->dp_read_overhead;
+ /*
+ * If we modify a dataset in the same txg that we want to destroy it,
+ * its dsl_dir's dd_dbuf will be dirty, and thus have a hold on it.
+ * dsl_dir_destroy_check() will fail if there are unexpected holds.
+ * Therefore, we want to sync the MOS (thus syncing the dd_dbuf
+ * and clearing the hold on it) before we process the sync_tasks.
+ * The MOS data dirtied by the sync_tasks will be synced on the next
+ * pass.
+ */
+ DTRACE_PROBE(pool_sync__3task);
+ if (!txg_list_empty(&dp->dp_sync_tasks, txg)) {
+ dsl_sync_task_group_t *dstg;
+ /*
+ * No more sync tasks should have been added while we
+ * were syncing.
+ */
+ ASSERT(spa_sync_pass(dp->dp_spa) == 1);
+ while ((dstg = txg_list_remove(&dp->dp_sync_tasks, txg)))
+ dsl_sync_task_group_sync(dstg, tx);
+ }
+
dmu_tx_commit(tx);
dp->dp_space_towrite[txg & TXG_MASK] = 0;
void
dsl_pool_sync_done(dsl_pool_t *dp, uint64_t txg)
{
+ zilog_t *zilog;
dsl_dataset_t *ds;
- objset_t *os;
- while ((ds = list_head(&dp->dp_synced_datasets))) {
- list_remove(&dp->dp_synced_datasets, ds);
- os = ds->ds_objset;
- zil_clean(os->os_zil, txg);
- ASSERT(!dmu_objset_is_dirty(os, txg));
- dmu_buf_rele(ds->ds_dbuf, ds);
+ while ((zilog = txg_list_remove(&dp->dp_dirty_zilogs, txg))) {
+ ds = dmu_objset_ds(zilog->zl_os);
+ zil_clean(zilog, txg);
+ ASSERT(!dmu_objset_is_dirty(zilog->zl_os, txg));
+ dmu_buf_rele(ds->ds_dbuf, zilog);
}
ASSERT(!dmu_objset_is_dirty(dp->dp_meta_objset, txg));
}
dsl_pool_sync_context(dsl_pool_t *dp)
{
return (curthread == dp->dp_tx.tx_sync_thread ||
- spa_get_dsl(dp->dp_spa) == NULL);
+ spa_is_initializing(dp->dp_spa));
}
uint64_t
ASSERT(dp->dp_tmp_userrefs_obj == 0);
ASSERT(dmu_tx_is_syncing(tx));
- dp->dp_tmp_userrefs_obj = zap_create(mos, DMU_OT_USERREFS,
- DMU_OT_NONE, 0, tx);
-
- VERIFY(zap_add(mos, DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS,
- sizeof (uint64_t), 1, &dp->dp_tmp_userrefs_obj, tx) == 0);
+ dp->dp_tmp_userrefs_obj = zap_create_link(mos, DMU_OT_USERREFS,
+ DMU_POOL_DIRECTORY_OBJECT, DMU_POOL_TMP_USERREFS, tx);
}
static int
MODULE_PARM_DESC(zfs_write_limit_shift, "log2(fraction of memory) per txg");
module_param(zfs_txg_synctime_ms, int, 0644);
-MODULE_PARM_DESC(zfs_txg_synctime_ms, "Target milliseconds between tgx sync");
+MODULE_PARM_DESC(zfs_txg_synctime_ms, "Target milliseconds between txg sync");
+
+module_param(zfs_txg_history, int, 0644);
+MODULE_PARM_DESC(zfs_txg_history, "Historic statistics for the last N txgs");
module_param(zfs_write_limit_min, ulong, 0444);
-MODULE_PARM_DESC(zfs_write_limit_min, "Min tgx write limit");
+MODULE_PARM_DESC(zfs_write_limit_min, "Min txg write limit");
module_param(zfs_write_limit_max, ulong, 0444);
-MODULE_PARM_DESC(zfs_write_limit_max, "Max tgx write limit");
+MODULE_PARM_DESC(zfs_write_limit_max, "Max txg write limit");
module_param(zfs_write_limit_inflated, ulong, 0444);
-MODULE_PARM_DESC(zfs_write_limit_inflated, "Inflated tgx write limit");
+MODULE_PARM_DESC(zfs_write_limit_inflated, "Inflated txg write limit");
module_param(zfs_write_limit_override, ulong, 0444);
-MODULE_PARM_DESC(zfs_write_limit_override, "Override tgx write limit");
+MODULE_PARM_DESC(zfs_write_limit_override, "Override txg write limit");
#endif
git://git.camperquake.de / zfs.git / blobdiff