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Add KSTAT_TYPE_TXG type 

Add a new kstat type for tracking useful statistics about a TXG.
The new KSTAT_TYPE_TXG type can be used to 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 2012-10-22 16:57:27 -07:00
parent 71c9f0b003
commit dba79fcbf2
2 changed files with 61 additions and 1 deletions
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23
include/sys/kstat.h
View File

@ -43,7 +43,8 @@
#define KSTAT_TYPE_INTR 2 /* interrupt stats; ks_ndata == 1 */
#define KSTAT_TYPE_IO 3 /* I/O stats; ks_ndata == 1 */
#define KSTAT_TYPE_TIMER 4 /* event timer; ks_ndata >= 1 */
#define KSTAT_NUM_TYPES 5
#define KSTAT_TYPE_TXG 5 /* txg sync; ks_ndata >= 1 */
#define KSTAT_NUM_TYPES 6
#define KSTAT_DATA_CHAR 0
#define KSTAT_DATA_INT32 1
@ -156,6 +157,26 @@ typedef struct kstat_timer {
hrtime_t stop_time; /* previous event stop time */
} kstat_timer_t;
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;
int spl_kstat_init(void);
void spl_kstat_fini(void);

39
module/spl/spl-kstat.c
View File

@ -78,6 +78,14 @@ kstat_seq_show_headers(struct seq_file *f)
"name", "events", "elapsed",
"min", "max", "start", "stop");
break;
case KSTAT_TYPE_TXG:
seq_printf(f,
"%-8s %-5s %-13s %-12s %-12s %-8s %-8s "
"%-12s %-12s %-12s\n",
"txg", "state", "birth",
"nread", "nwritten", "reads", "writes",
"otime", "qtime", "stime");
break;
default:
PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
@ -190,6 +198,27 @@ kstat_seq_show_timer(struct seq_file *f, kstat_timer_t *ktp)
return 0;
}
static int
kstat_seq_show_txg(struct seq_file *f, kstat_txg_t *ktp)
{
char state;
switch (ktp->state) {
case TXG_STATE_OPEN: state = 'O'; break;
case TXG_STATE_QUIESCING: state = 'Q'; break;
case TXG_STATE_SYNCING: state = 'S'; break;
case TXG_STATE_COMMITTED: state = 'C'; break;
default: state = '?'; break;
}
seq_printf(f,
"%-8llu %-5c %-13llu %-12llu %-12llu %-8u %-8u "
"%12lld %12lld %12lld\n", ktp->txg, state, ktp->birth,
ktp->nread, ktp->nwritten, ktp->reads, ktp->writes,
ktp->open_time, ktp->quiesce_time, ktp->sync_time);
return 0;
}
static int
kstat_seq_show(struct seq_file *f, void *p)
{
@ -216,6 +245,9 @@ kstat_seq_show(struct seq_file *f, void *p)
case KSTAT_TYPE_TIMER:
rc = kstat_seq_show_timer(f, (kstat_timer_t *)p);
break;
case KSTAT_TYPE_TXG:
rc = kstat_seq_show_txg(f, (kstat_txg_t *)p);
break;
default:
PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
@ -252,6 +284,9 @@ kstat_seq_data_addr(kstat_t *ksp, loff_t n)
case KSTAT_TYPE_TIMER:
rc = ksp->ks_data + n * sizeof(kstat_timer_t);
break;
case KSTAT_TYPE_TXG:
rc = ksp->ks_data + n * sizeof(kstat_txg_t);
break;
default:
PANIC("Undefined kstat type %d\n", ksp->ks_type);
}
@ -396,6 +431,10 @@ __kstat_create(const char *ks_module, int ks_instance, const char *ks_name,
ksp->ks_ndata = ks_ndata;
ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
break;
case KSTAT_TYPE_TXG:
ksp->ks_ndata = ks_ndata;
ksp->ks_data_size = ks_ndata * sizeof(kstat_timer_t);
break;
default:
PANIC("Undefined kstat type %d\n", ksp->ks_type);
}