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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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lib/libspl/include/sys/kstat.h
+26 -1
View File
@@ -228,8 +228,10 @@ typedef struct kstat32 {
/* ks_ndata == 1 */
#define KSTAT_TYPE_TIMER 4 /* event timer */
/* ks_ndata >= 1 */
#define KSTAT_TYPE_TXG 5 /* txg statistics */
/* ks_ndata >= 0 */
#define KSTAT_NUM_TYPES 5
#define KSTAT_NUM_TYPES 6
/*
* kstat class
@@ -698,6 +700,29 @@ typedef struct kstat_timer {
#define KSTAT_TIMER_PTR(kptr) ((kstat_timer_t *)(kptr)->ks_data)
/*
* TXG statistics - bytes read/written and iops performed
*/
typedef enum kstat_txg_state {
TXG_STATE_OPEN = 1,
TXG_STATE_QUIESCING = 2,
TXG_STATE_SYNCING = 3,
TXG_STATE_COMMITTED = 4,
} kstat_txg_state_t;
typedef struct kstat_txg {
u_longlong_t txg; /* txg id */
kstat_txg_state_t state; /* txg state */
hrtime_t birth; /* birth time stamp */
u_longlong_t nread; /* number of bytes read */
u_longlong_t nwritten; /* number of bytes written */
uint_t reads; /* number of read operations */
uint_t writes; /* number of write operations */
hrtime_t open_time; /* open time */
hrtime_t quiesce_time; /* quiesce time */
hrtime_t sync_time; /* sync time */
} kstat_txg_t;
#if defined(_KERNEL)
#include <sys/t_lock.h>