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Add visibility in to dmu_tx_assign times

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This change adds a new kstat to gain some visibility into the
amount of time spent in each call to dmu_tx_assign. A histogram
is exported via the new dmu_tx_assign file. The information
contained in this histogram is the frequency dmu_tx_assign
took to complete given an interval range.

Signed-off-by: Prakash Surya <surya1@llnl.gov>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2013-10-02 11:43:52 -07:00
parent 0b1401ee91
commit 2d37239a28
3 changed files with 113 additions and 0 deletions
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include/sys/spa.h
+2
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@@ -549,6 +549,7 @@ typedef struct spa_stats_history {
typedef struct spa_stats {
spa_stats_history_t read_history;
spa_stats_history_t txg_history;
spa_stats_history_t tx_assign_histogram;
} spa_stats_t;
typedef enum txg_state {
@@ -568,6 +569,7 @@ extern int spa_txg_history_set(spa_t *spa, uint64_t txg,
txg_state_t completed_state, hrtime_t completed_time);
extern int spa_txg_history_set_io(spa_t *spa, uint64_t txg, uint64_t nread,
uint64_t nwritten, uint64_t reads, uint64_t writes, uint64_t nreserved);
extern void spa_tx_assign_add_nsecs(spa_t *spa, uint64_t nsecs);
/* Pool configuration locks */
extern int spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw);