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Add txgs-<pool> kstat file

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Create a kstat file which contains useful statistics about the
last N txgs processed.  This can be helpful when analyzing pool
performance.  The new KSTAT_TYPE_TXG type was added for this
purpose and it tracks the following statistics per-txg.

  txg          - Unique txg number
  state        - State (O)pen/(Q)uiescing/(S)yncing/(C)ommitted
  birth;       - Creation time
  nread        - Bytes read
  nwritten;    - Bytes written
  reads        - IOPs read
  writes       - IOPs write
  open_time;   - Length in nanoseconds the txg was open
  quiesce_time - Length in nanoseconds the txg was quiescing
  sync_time;   - Length in nanoseconds the txg was syncing

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2012-10-23 13:48:22 -07:00
parent e8fd45a0f9
commit e95853a331
4 changed files with 231 additions and 1 deletions
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include/sys/dsl_pool.h
+15
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@@ -65,6 +65,13 @@ typedef struct zfs_all_blkstats {
zfs_blkstat_t zab_type[DN_MAX_LEVELS + 1][DMU_OT_TOTAL + 1];
} zfs_all_blkstats_t;
typedef struct txg_history {
kstat_txg_t th_kstat;
vdev_stat_t th_vs1;
vdev_stat_t th_vs2;
kmutex_t th_lock;
list_node_t th_link;
} txg_history_t;
typedef struct dsl_pool {
/* Immutable */
@@ -76,6 +83,7 @@ typedef struct dsl_pool {
struct dsl_dataset *dp_origin_snap;
uint64_t dp_root_dir_obj;
struct taskq *dp_iput_taskq;
kstat_t *dp_txg_kstat;
/* No lock needed - sync context only */
blkptr_t dp_meta_rootbp;
@@ -92,6 +100,9 @@ typedef struct dsl_pool {
kmutex_t dp_lock;
uint64_t dp_space_towrite[TXG_SIZE];
uint64_t dp_tempreserved[TXG_SIZE];
uint64_t dp_txg_history_size;
list_t dp_txg_history;
/* Has its own locking */
tx_state_t dp_tx;
@@ -144,6 +155,10 @@ extern int dsl_pool_user_release(dsl_pool_t *dp, uint64_t dsobj,
extern void dsl_pool_clean_tmp_userrefs(dsl_pool_t *dp);
int dsl_pool_open_special_dir(dsl_pool_t *dp, const char *name, dsl_dir_t **);
txg_history_t *dsl_pool_txg_history_add(dsl_pool_t *dp, uint64_t txg);
txg_history_t *dsl_pool_txg_history_get(dsl_pool_t *dp, uint64_t txg);
void dsl_pool_txg_history_put(txg_history_t *th);
#ifdef __cplusplus
}
#endif