diff options
Diffstat (limited to 'src/include/mutex.h')
| -rw-r--r-- | src/include/mutex.h | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/src/include/mutex.h b/src/include/mutex.h index f0f8173bad4..b736d6ee9fb 100644 --- a/src/include/mutex.h +++ b/src/include/mutex.h @@ -74,6 +74,16 @@ struct __wt_rwlock { struct WT_COMPILER_TYPE_ALIGN(WT_CACHE_LINE_ALIGNMENT) __wt_spinlock { volatile int lock; + + /* + * We track acquisitions and time spent waiting for some locks. For + * performance reasons and to make it possible to write generic code + * that tracks statistics for different locks, we store the offset + * of the statistics fields to be updated during lock acquisition. + */ + int16_t stat_count_off; /* acquisitions offset */ + int16_t stat_app_usecs_off; /* waiting application threads offset */ + int16_t stat_int_usecs_off; /* waiting server threads offset */ }; #elif SPINLOCK_TYPE == SPINLOCK_PTHREAD_MUTEX ||\ @@ -83,7 +93,17 @@ struct WT_COMPILER_TYPE_ALIGN(WT_CACHE_LINE_ALIGNMENT) __wt_spinlock { struct WT_COMPILER_TYPE_ALIGN(WT_CACHE_LINE_ALIGNMENT) __wt_spinlock { wt_mutex_t lock; - const char *name; /* Statistics: mutex name */ + const char *name; /* Mutex name */ + + /* + * We track acquisitions and time spent waiting for some locks. For + * performance reasons and to make it possible to write generic code + * that tracks statistics for different locks, we store the offset + * of the statistics fields to be updated during lock acquisition. + */ + int16_t stat_count_off; /* acquisitions offset */ + int16_t stat_app_usecs_off; /* waiting application threads offset */ + int16_t stat_int_usecs_off; /* waiting server threads offset */ int8_t initialized; /* Lock initialized, for cleanup */ }; |