[PATCH 02/10] perf tools: Introduce callchain_cursor__copy()

[Namhyung Kim]

The callchain_cursor__copy() function is to save current callchain
captured by a cursor.  It'll be used to keep callchains when switching
to idle task for each cpu.

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/util/callchain.c | 27 +++++++++++++++++++++++++++
 tools/perf/util/callchain.h |  3 +++
 2 files changed, 30 insertions(+)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 823befd8209a..42922512c1c6 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -1234,3 +1234,30 @@ int callchain_node__make_parent_list(struct 
callchain_node *node)
        }
        return -ENOMEM;
 }
+
+int callchain_cursor__copy(struct callchain_cursor *dst,
+                          struct callchain_cursor *src)
+{
+       int rc = 0;
+
+       callchain_cursor_reset(dst);
+       callchain_cursor_commit(src);
+
+       while (true) {
+               struct callchain_cursor_node *node;
+
+               node = callchain_cursor_current(src);
+               if (node == NULL)
+                       break;
+
+               rc = callchain_cursor_append(dst, node->ip, node->map, 
node->sym,
+                                            node->branch, &node->branch_flags,
+                                            node->nr_loop_iter, node->samples);
+               if (rc)
+                       break;
+
+               callchain_cursor_advance(src);
+       }
+
+       return rc;
+}
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index d9c70dccf06a..35c8e379530f 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -216,6 +216,9 @@ static inline void callchain_cursor_advance(struct 
callchain_cursor *cursor)
        cursor->pos++;
 }
 
+int callchain_cursor__copy(struct callchain_cursor *dst,
+                          struct callchain_cursor *src);
+
 struct option;
 struct hist_entry;
 
-- 
2.10.1