[PATCH 4/6] perf script: add call path id to exported sample in db export

[Chris Phlipot <cphlipot0@gmail.com>]

The exported sample now contains a reference to the call_path_id that
represents its callchain.

While callchains themselves are nice to have, being able to associate
them with samples makes them much more useful, and can allow for such
things as determining how much cumulative time is spent in a particular
function. This information is normally possible to get from the
call return processor. However, when doing normal sampling, call/return
information is not available, thus necessitating the need for associating
samples directly with call paths.

This commit include changes to db-export layer to make this information
available for subsequent patches in this change set, but by itself, does
not make any changes visible to the user.

Signed-off-by: Chris Phlipot <cphlipot0@gmail.com>
---
 tools/perf/util/db-export.c | 4 +++-
 tools/perf/util/db-export.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index cb96591..74f6875 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -412,8 +412,10 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 		struct call_path *cp = call_path_from_sample(dbe, al->machine,
 							     thread, sample,
 							     evsel);
-		if (cp)
+		if (cp) {
 			db_export__call_path(dbe, cp);
+			es.call_path_id = cp->db_id;
+		}
 	}
 
 	if ((evsel->attr.sample_type & PERF_SAMPLE_ADDR) &&
diff --git a/tools/perf/util/db-export.h b/tools/perf/util/db-export.h
index f5daf55..67bc6b8 100644
--- a/tools/perf/util/db-export.h
+++ b/tools/perf/util/db-export.h
@@ -44,6 +44,7 @@ struct export_sample {
 	u64			addr_dso_db_id;
 	u64			addr_sym_db_id;
 	u64			addr_offset; /* addr offset from symbol start */
+	u64			call_path_id;
 };
 
 struct db_export {
-- 
2.7.4