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-rw-r--r--tools/perf/util/callchain.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index dc2212e12184..abb608b09269 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -23,8 +23,10 @@
#include "util.h"
#include "sort.h"
#include "machine.h"
+#include "map.h"
#include "callchain.h"
#include "branch.h"
+#include "symbol.h"
#define CALLCHAIN_PARAM_DEFAULT \
.mode = CHAIN_GRAPH_ABS, \
@@ -1577,3 +1579,18 @@ int callchain_cursor__copy(struct callchain_cursor *dst,
return rc;
}
+
+/*
+ * Initialize a cursor before adding entries inside, but keep
+ * the previously allocated entries as a cache.
+ */
+void callchain_cursor_reset(struct callchain_cursor *cursor)
+{
+ struct callchain_cursor_node *node;
+
+ cursor->nr = 0;
+ cursor->last = &cursor->first;
+
+ for (node = cursor->first; node != NULL; node = node->next)
+ map__zput(node->map);
+}