X-Git-Url: http://rtime.felk.cvut.cz/gitweb/can-benchmark.git/blobdiff_plain/67617ebf00d594ee3c932b6c8e1850265f28adee..1df7ce4dbf6b357b85234709150bc98c8c1250a5:/latester/histogram.h

diff --git a/latester/histogram.h b/latester/histogram.h
index 4a9aade..b4546e4 100644
--- a/latester/histogram.h
+++ b/latester/histogram.h
@@ -23,8 +23,9 @@ int histogram_init(struct histogram *h,
 		return -1;
 }
 
-void histogram_add(struct histogram *h, unsigned value)
+void histogram_add(struct histogram *h, int value)
 {
+	if (value < 0) value = 0;
 	unsigned index = value / h->resolution;
 	if (index >= h->allocated)
 		index = h->allocated - 1;
@@ -35,6 +36,10 @@ void histogram_fprint(struct histogram *h, FILE *f)
 {
 	unsigned long long sum = 0, cum;
 	unsigned i;
+
+	if (!f)
+		return;
+
 	for (i = 0; i < h->allocated; i++)
 		sum += h->data[i];
 	cum = sum;
@@ -47,5 +52,41 @@ void histogram_fprint(struct histogram *h, FILE *f)
 }
 
 
+struct histogram_stats {
+	unsigned count;
+	unsigned long long sum;
+	unsigned avg;
+	unsigned percentile[101];
+};
+
+void histogram_stats(struct histogram *h, struct histogram_stats *s)
+{
+	unsigned long long sum;
+	unsigned i, j;
+
+	if (!s)
+		return;
+
+	memset(s, 0, sizeof(*s));
+
+	for (i = 0; i < h->allocated; i++) {
+		s->count += h->data[i];
+		s->sum += h->data[i] * i * h->resolution;
+	}
+	if (s->count == 0)
+		return;
+
+	s->avg = s->sum / s->count;
+
+	for (i = 0, j = 0, sum = 0; i < 100; i++) {
+		while (sum <= i * s->count / 100)
+			sum += h->data[j++];
+
+		s->percentile[i] = (j-1) * h->resolution;
+	}
+	while (sum < i * s->count / 100)
+		sum += h->data[j++];
+	s->percentile[100] = (j-1) * h->resolution;
+}
 
 #endif