Add background thread related stats.

4 files changed, 16 insertions, 0 deletions

diff --git a/include/jemalloc/internal/background_thread_externs.h b/include/jemalloc/internal/background_thread_externs.h
index 993f0e3..fe25acf 100644
--- a/include/jemalloc/internal/background_thread_externs.h
+++ b/include/jemalloc/internal/background_thread_externs.h
@@ -19,6 +19,8 @@ void background_thread_prefork0(tsdn_t *tsdn);
 void background_thread_prefork1(tsdn_t *tsdn);
 void background_thread_postfork_parent(tsdn_t *tsdn);
 void background_thread_postfork_child(tsdn_t *tsdn);
+bool background_thread_stats_read(tsdn_t *tsdn,
+    background_thread_stats_t *stats);
 
 #if defined(JEMALLOC_BACKGROUND_THREAD) || defined(JEMALLOC_LAZY_LOCK)
 extern int (*pthread_create_fptr)(pthread_t *__restrict, const pthread_attr_t *,
diff --git a/include/jemalloc/internal/background_thread_structs.h b/include/jemalloc/internal/background_thread_structs.h
index a43d600..c4eb827 100644
--- a/include/jemalloc/internal/background_thread_structs.h
+++ b/include/jemalloc/internal/background_thread_structs.h
@@ -18,8 +18,19 @@ struct background_thread_info_s {
 	 *  background thread to wake up earlier.
 	 */
 	size_t			npages_to_purge_new;
+	/* Stats: total number of runs since started. */
+	uint64_t		tot_n_runs;
+	/* Stats: total sleep time since started. */
+	nstime_t		tot_sleep_time;
 #endif /* ifdef JEMALLOC_BACKGROUND_THREAD */
 };
 typedef struct background_thread_info_s background_thread_info_t;
 
+struct background_thread_stats_s {
+	size_t num_threads;
+	uint64_t num_runs;
+	nstime_t run_interval;
+};
+typedef struct background_thread_stats_s background_thread_stats_t;
+
 #endif /* JEMALLOC_INTERNAL_BACKGROUND_THREAD_STRUCTS_H */
diff --git a/include/jemalloc/internal/ctl.h b/include/jemalloc/internal/ctl.h
index 60b3979..f159383 100644
--- a/include/jemalloc/internal/ctl.h
+++ b/include/jemalloc/internal/ctl.h
@@ -52,6 +52,7 @@ typedef struct ctl_stats_s {
 	size_t mapped;
 	size_t retained;
 
+	background_thread_stats_t background_thread;
 	mutex_prof_data_t mutex_prof_data[mutex_prof_num_global_mutexes];
 } ctl_stats_t;
 
diff --git a/include/jemalloc/internal/nstime.h b/include/jemalloc/internal/nstime.h
index ad7efb8..17c177c 100644
--- a/include/jemalloc/internal/nstime.h
+++ b/include/jemalloc/internal/nstime.h
@@ -18,7 +18,9 @@ uint64_t nstime_nsec(const nstime_t *time);
 void nstime_copy(nstime_t *time, const nstime_t *source);
 int nstime_compare(const nstime_t *a, const nstime_t *b);
 void nstime_add(nstime_t *time, const nstime_t *addend);
+void nstime_iadd(nstime_t *time, uint64_t addend);
 void nstime_subtract(nstime_t *time, const nstime_t *subtrahend);
+void nstime_isubtract(nstime_t *time, uint64_t subtrahend);
 void nstime_imultiply(nstime_t *time, uint64_t multiplier);
 void nstime_idivide(nstime_t *time, uint64_t divisor);
 uint64_t nstime_divide(const nstime_t *time, const nstime_t *divisor);