Add new kstat for monitoring time in dmu_tx_assign

[zfs.git] / module / zfs / dsl_pool.c

diff --git a/module/zfs/dsl_pool.c b/module/zfs/dsl_pool.c
index 6d25771..7795d80 100644 (file)
--- a/module/zfs/dsl_pool.c
+++ b/module/zfs/dsl_pool.c
@@ -58,6 +58,63 @@ kmutex_t zfs_write_limit_lock;
 
 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)
 {
@@ -238,6 +295,7 @@ dsl_pool_open_impl(spa_t *spa, uint64_t txg)
            1, 4, 0);
 
        dsl_pool_txg_history_init(dp, txg);
+       dsl_pool_tx_assign_init(dp, 32);
 
        return (dp);
 }
@@ -379,6 +437,7 @@ dsl_pool_close(dsl_pool_t *dp)
        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);