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@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-13-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index b1e581c13963efbed233f99a8649014248c098b8..5057fdd7f62d3b5d8d84396e71ae615e874a4bbf 100644 (file)
--- 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);