linux-kernel - [tip:perf/urgent] perf db-export: Also export thread's current comm

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Message-ID: <tip-4650c7bed79582c74452d284e45d5b76987c0ef3@git.kernel.org>
Date:   Wed, 17 Jul 2019 15:59:05 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     jolsa@...hat.com, acme@...hat.com, hpa@...or.com,
        tglx@...utronix.de, adrian.hunter@...el.com, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf db-export: Also export thread's current comm

Commit-ID:  4650c7bed79582c74452d284e45d5b76987c0ef3
Gitweb:     https://git.kernel.org/tip/4650c7bed79582c74452d284e45d5b76987c0ef3
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Wed, 10 Jul 2019 11:58:01 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 10 Jul 2019 12:14:07 -0300

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>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-13-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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 b1e581c13963..5057fdd7f62d 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -299,6 +299,7 @@ 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);
@@ -350,6 +351,13 @@ 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);