[tip:perf/core] perf script: Add call path id to exported sample in db export

[tip-bot for Chris Phlipot <tipbot@zytor.com>]

Commit-ID:  568850eaad8cdd3783c3347623dfcad4f043cf1c
Gitweb:     http://git.kernel.org/tip/568850eaad8cdd3783c3347623dfcad4f043cf1c
Author:     Chris Phlipot <cphlipot0@gmail.com>
AuthorDate: Thu, 28 Apr 2016 01:19:09 -0700
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Fri, 6 May 2016 13:00:53 -0300

perf script: Add call path id to exported sample in db export

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>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1461831551-12213-5-git-send-email-cphlipot0@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.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 a0ca90c..f8e3057 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -408,8 +408,10 @@ 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 {