2 files changed, 10 insertions, 0 deletions

diff --git a/tools/perf/util/xyarray.c b/tools/perf/util/xyarray.c
index 22afbf6c536a..c10ba41ef3f6 100644
--- a/tools/perf/util/xyarray.c
+++ b/tools/perf/util/xyarray.c
@@ -9,11 +9,19 @@ struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size)
         if (xy != NULL) {
                 xy->entry_size = entry_size;
                 xy->row_size   = row_size;
+                xy->entries    = xlen * ylen;
         }
 
         return xy;
 }
 
+void xyarray__reset(struct xyarray *xy)
+{
+        size_t n = xy->entries * xy->entry_size;
+
+        memset(xy->contents, 0, n);
+}
+
 void xyarray__delete(struct xyarray *xy)
 {
         free(xy);
diff --git a/tools/perf/util/xyarray.h b/tools/perf/util/xyarray.h
index c488a07275dd..7f30af371b7e 100644
--- a/tools/perf/util/xyarray.h
+++ b/tools/perf/util/xyarray.h
@@ -6,11 +6,13 @@
 struct xyarray {
         size_t row_size;
         size_t entry_size;
+        size_t entries;
         char contents[];
 };
 
 struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size);
 void xyarray__delete(struct xyarray *xy);
+void xyarray__reset(struct xyarray *xy);
 
 static inline void *xyarray__entry(struct xyarray *xy, int x, int y)
 {