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-rw-r--r--tools/perf/util/spark.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/perf/util/spark.c b/tools/perf/util/spark.c
new file mode 100644
index 000000000..70272a8b8
--- /dev/null
+++ b/tools/perf/util/spark.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+#include "spark.h"
+#include "stat.h"
+
+#define SPARK_SHIFT 8
+
+/* Print spark lines on outf for numval values in val. */
+int print_spark(char *bf, int size, unsigned long *val, int numval)
+{
+ static const char *ticks[NUM_SPARKS] = {
+ "▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"
+ };
+ int i, printed = 0;
+ unsigned long min = ULONG_MAX, max = 0, f;
+
+ for (i = 0; i < numval; i++) {
+ if (val[i] < min)
+ min = val[i];
+ if (val[i] > max)
+ max = val[i];
+ }
+ f = ((max - min) << SPARK_SHIFT) / (NUM_SPARKS - 1);
+ if (f < 1)
+ f = 1;
+ for (i = 0; i < numval; i++) {
+ printed += scnprintf(bf + printed, size - printed, "%s",
+ ticks[((val[i] - min) << SPARK_SHIFT) / f]);
+ }
+
+ return printed;
+}