diff --git a/mars_trans_logger.c b/mars_trans_logger.c
index 0682c7e0..49a6f0d6 100644
--- a/mars_trans_logger.c
+++ b/mars_trans_logger.c
@@ -42,6 +42,9 @@
 
 ///////////////////////// global tuning ////////////////////////
 
+int trans_logger_completion_semantics = 1;
+EXPORT_SYMBOL_GPL(trans_logger_completion_semantics);
+
 int trans_logger_do_crc =
 #ifdef CONFIG_MARS_DEBUG
 	true;
@@ -1351,9 +1354,9 @@ void _complete(struct trans_logger_brick *brick, struct trans_logger_mref_aspect
 	CHECK_PTR(orig_mref, err);
 
 	if (orig_mref_a->is_completed || 
-	   (pre_io &&
-	    (brick->completion_semantics >= 2 ||
-	     (brick->completion_semantics >= 1 && !orig_mref->ref_skip_sync)))) {
+	    (pre_io &&
+	     (trans_logger_completion_semantics >= 2 ||
+	      (trans_logger_completion_semantics >= 1 && !orig_mref->ref_skip_sync)))) {
 		goto done;
 	}
 
diff --git a/mars_trans_logger.h b/mars_trans_logger.h
index 38380183..869e07e6 100644
--- a/mars_trans_logger.h
+++ b/mars_trans_logger.h
@@ -18,6 +18,11 @@
 
 ///////////////////////// global tuning ////////////////////////
 
+/* 0 = early completion of all writes
+ * 1 = early completion of non-sync
+ * 2 = late completion
+ */
+extern int trans_logger_completion_semantics;
 extern int trans_logger_do_crc;
 extern int trans_logger_mem_usage; // in KB
 extern int trans_logger_max_depth;
@@ -141,7 +146,6 @@ struct trans_logger_brick {
 	int max_mref_size;// shorten mrefs to this maxlen
 	int align_size;   // alignment between requests
 	int chunk_size;   // must be at least 8K (better 64k)
-	int completion_semantics; // 0 = early completion of all writes, 1 = early completion of non-sync, 2 = late completion
 	bool replay_mode;   // mode of operation
 	bool continuous_replay_mode;   // mode of operation
 	bool log_reads;   // additionally log pre-images
diff --git a/sy_old/mars_light.c b/sy_old/mars_light.c
index d6a2ec75..7380ee65 100644
--- a/sy_old/mars_light.c
+++ b/sy_old/mars_light.c
@@ -138,8 +138,6 @@ EXPORT_SYMBOL_GPL(mars_mem_percent);
 #define CONF_TRANS_PRIO   MARS_PRIO_HIGH
 #define CONF_TRANS_LOG_READS false
 //#define CONF_TRANS_LOG_READS true
-//#define CONF_TRANS_COMPLETION_SEMANTICS 2
-#define CONF_TRANS_COMPLETION_SEMANTICS 0
 
 #define CONF_ALL_BATCHLEN 1
 #define CONF_ALL_PRIO   MARS_PRIO_NORMAL
@@ -196,7 +194,7 @@ int _set_trans_params(struct mars_brick *_brick, void *private)
 
 		trans_brick->shadow_mem_limit = CONF_TRANS_SHADOW_LIMIT;
 		trans_brick->log_reads = CONF_TRANS_LOG_READS;
-		trans_brick->completion_semantics = CONF_TRANS_COMPLETION_SEMANTICS;
+
 #ifdef TRANS_FAKE
 		trans_brick->debug_shortcut = true;
 #endif
diff --git a/sy_old/mars_proc.c b/sy_old/mars_proc.c
index 62cddec3..e25b6c41 100644
--- a/sy_old/mars_proc.c
+++ b/sy_old/mars_proc.c
@@ -198,6 +198,7 @@ ctl_table mars_table[] = {
 		.mode		= 0400,
 		.proc_handler	= &lamport_sysctl_handler,
 	},
+	INT_ENTRY("logger_completion_semantics", trans_logger_completion_semantics, 0600),
 	INT_ENTRY("logger_do_crc",        trans_logger_do_crc,    0600),
 	INT_ENTRY("syslog_min_class",     brick_say_syslog_min,   0600),
 	INT_ENTRY("syslog_max_class",     brick_say_syslog_max,   0600),