Commit 568850ea authored Apr 28, 2016 by Chris Phlipot Committed by Arnaldo Carvalho de Melo May 06, 2016

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>

parent 0a3eba3a

tools/perf/util/db-export.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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) &&

tools/perf/util/db-export.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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 {