[PATCH 42/52] perf tools: Defer export of comms that were not 'set'

Adrian Hunter
2014-07-22T13:21:34Z

Tracing for a workload begins before the comm event
is seen, which results in the initial comm having a
string of the form ":<pid>" (e.g. ":12345"). In order
to export the correct string, defer the export until
the new script 'flush' callback.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
tools/perf/util/db-export.c | 62 +++++++++++++++++++++-
tools/perf/util/db-export.h | 3 ++
.../util/scripting-engines/trace-event-python.c | 4 +-
3 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index ca79616..ef61cf7 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -21,17 +21,74 @@
#include "comm.h"
#include "symbol.h"
#include "event.h"
+#include "util.h"
#include "thread-stack.h"
#include "db-export.h"

+struct deferred_export {
+ struct list_head node;
+ struct comm *comm;
+};
+
+static int db_export__deferred(struct db_export *dbe)
+{
+ struct deferred_export *de;
+ int err;
+
+ while (!list_empty(&dbe->deferred)) {
+ de = list_entry(dbe->deferred.next, struct deferred_export,
+ node);
+ err = dbe->export_comm(dbe, de->comm);
+ list_del(&de->node);
+ free(de);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+static void db_export__free_deferred(struct db_export *dbe)
+{
+ struct deferred_export *de;
+
+ while (!list_empty(&dbe->deferred)) {
+ de = list_entry(dbe->deferred.next, struct deferred_export,
+ node);
+ list_del(&de->node);
+ free(de);
+ }
+}
+
+static int db_export__defer_comm(struct db_export *dbe, struct comm *comm)
+{
+ struct deferred_export *de;
+
+ de = zalloc(sizeof(struct deferred_export));
+ if (!de)
+ return -ENOMEM;
+
+ de->comm = comm;
+ list_add_tail(&de->node, &dbe->deferred);
+
+ return 0;
+}
+
int db_export__init(struct db_export *dbe)
{
memset(dbe, 0, sizeof(struct db_export));
+ INIT_LIST_HEAD(&dbe->deferred);
return 0;
}

+int db_export__flush(struct db_export *dbe)
+{
+ return db_export__deferred(dbe);
+}
+
void db_export__exit(struct db_export *dbe)
{
+ db_export__free_deferred(dbe);
call_return_processor__free(dbe->crp);
dbe->crp = NULL;
}
@@ -115,7 +172,10 @@ int db_export__comm(struct db_export *dbe, struct comm *comm,
comm->db_id = ++dbe->comm_last_db_id;

if (dbe->export_comm) {
- err = dbe->export_comm(dbe, comm);
+ if (main_thread->comm_set)
+ err = dbe->export_comm(dbe, comm);
+ else
+ err = db_export__defer_comm(dbe, comm);
if (err)
return err;
}
diff --git a/tools/perf/util/db-export.h b/tools/perf/util/db-export.h
index dd5ac2a..adbd22d 100644
--- a/tools/perf/util/db-export.h
+++ b/tools/perf/util/db-export.h
@@ -17,6 +17,7 @@
#define __PERF_DB_EXPORT_H

#include <linux/types.h>
+#include <linux/list.h>

struct perf_evsel;
struct machine;
@@ -74,9 +75,11 @@ struct db_export {
u64 sample_last_db_id;
u64 call_path_last_db_id;
u64 call_return_last_db_id;
+ struct list_head deferred;
};

int db_export__init(struct db_export *dbe);
+int db_export__flush(struct db_export *dbe);
void db_export__exit(struct db_export *dbe);
int db_export__evsel(struct db_export *dbe, struct perf_evsel *evsel);
int db_export__machine(struct db_export *dbe, struct machine *machine);
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index ed754d0..6c0ce62 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -1024,7 +1024,9 @@ error:

static int python_flush_script(void)
{
- return 0;
+ struct tables *tables = &tables_global;
+
+ return db_export__flush(&tables->dbe);
}

/*
--
1.8.3.2