diff options
| -rw-r--r-- | module/zfs/mmp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c index 2d740e025..a668e8dbd 100644 --- a/module/zfs/mmp.c +++ b/module/zfs/mmp.c @@ -323,7 +323,13 @@ mmp_write_uberblock(spa_t *spa) int label; uint64_t offset; + hrtime_t lock_acquire_time = gethrtime(); spa_config_enter(spa, SCL_STATE, mmp_tag, RW_READER); + lock_acquire_time = gethrtime() - lock_acquire_time; + if (lock_acquire_time > (MSEC2NSEC(MMP_MIN_INTERVAL) / 10)) + zfs_dbgmsg("SCL_STATE acquisition took %llu ns\n", + (u_longlong_t)lock_acquire_time); + vd = mmp_random_leaf(spa->spa_root_vdev); if (vd == NULL) { spa_config_exit(spa, SCL_STATE, FTAG); |