linux-kernel - [PATCH 12/21] perf db-export: Also export thread's current comm

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Date:   Wed, 10 Jul 2019 11:58:01 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 12/21] perf db-export: Also export thread's current comm

Currently, the initial comm of the main thread is exported. Export also a
thread's current comm. That better supports the tracing of multi-threaded
applications that set different comms for different threads to make it
easier to distinguish them.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/db-export.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index 305adead3a1d..2220a60ad29e 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -298,6 +298,7 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 	};
 	struct thread *main_thread;
 	struct comm *comm = NULL;
+	struct comm *curr_comm;
 	int err;
 
 	err = db_export__evsel(dbe, evsel);
@@ -349,6 +350,13 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 		}
 	}
 
+	curr_comm = thread__comm(thread);
+	if (curr_comm) {
+		err = db_export__comm(dbe, curr_comm, thread);
+		if (err)
+			goto out_put;
+	}
+
 	es.db_id = ++dbe->sample_last_db_id;
 
 	err = db_ids_from_al(dbe, al, &es.dso_db_id, &es.sym_db_id, &es.offset);
-- 
2.17.1