diff --git a/kernel/lib_timing.h b/kernel/lib_timing.h
index 51cd6922..8c346113 100644
--- a/kernel/lib_timing.h
+++ b/kernel/lib_timing.h
@@ -158,6 +158,7 @@ struct threshold {
 	int  thr_factor;  // in %
 	int  thr_plus;    // in us
 	// statistical
+	int thr_max;      // in ms
 	int thr_triggered;
 	int thr_true_hit;
 };
@@ -165,7 +166,10 @@ struct threshold {
 extern inline
 void threshold_check(struct threshold *thr, long long latency)
 {
+	int ms = latency >> 6; // ignore small rounding error
 	while (thr) {
+		if (ms > thr->thr_max)
+			thr->thr_max = ms;
 		if (thr->thr_limit &&
 		    latency > (long long)thr->thr_limit * 1000) {
 			thr->thr_triggered++;
diff --git a/kernel/sy_old/mars_proc.c b/kernel/sy_old/mars_proc.c
index 22435e67..b4f26e93 100644
--- a/kernel/sy_old/mars_proc.c
+++ b/kernel/sy_old/mars_proc.c
@@ -220,6 +220,7 @@ EXPORT_SYMBOL_GPL(mars_max_loadavg);
 	INT_ENTRY(PREFIX "_threshold_us",   (VAR)->thr_limit,    0600),	\
 	INT_ENTRY(PREFIX "_factor_percent", (VAR)->thr_factor,   0600),	\
 	INT_ENTRY(PREFIX "_plus_us",        (VAR)->thr_plus,     0600),	\
+	INT_ENTRY(PREFIX "_max_ms",         (VAR)->thr_max,      0600),	\
 	INT_ENTRY(PREFIX "_triggered",      (VAR)->thr_triggered,0400), \
 	INT_ENTRY(PREFIX "_true_hit",       (VAR)->thr_true_hit, 0400)	\