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perf db-export: Move export__comm_thread into db_export__sample()

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Move call to db_export__comm_thread() from db_export__thread() into
db_export__sample() because it makes the code easier to understand, and
add explanatory comments.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-07-10 11:57:55 +03:00 committed by Arnaldo Carvalho de Melo
parent 6319790bcf
commit 1ed1195898
2 changed files with 22 additions and 16 deletions
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35
tools/perf/util/db-export.c
View File

@ -59,25 +59,17 @@ int db_export__machine(struct db_export *dbe, struct machine *machine)
}
int db_export__thread(struct db_export *dbe, struct thread *thread,
struct machine *machine, struct comm *comm,
struct thread *main_thread)
struct machine *machine, struct thread *main_thread)
{
u64 main_thread_db_id = 0;
int err;
if (thread->db_id)
return 0;
thread->db_id = ++dbe->thread_last_db_id;
if (main_thread) {
if (main_thread != thread && comm) {
err = db_export__comm_thread(dbe, comm, thread);
if (err)
return err;
}
if (main_thread)
main_thread_db_id = main_thread->db_id;
}
if (dbe->export_thread)
return dbe->export_thread(dbe, thread, main_thread_db_id,
@ -303,15 +295,19 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
main_thread = thread__main_thread(al->machine, thread);
if (main_thread) {
comm = machine__thread_exec_comm(al->machine, main_thread);
/*
* A thread has a reference to the main thread, so export the
* main thread first.
*/
err = db_export__thread(dbe, main_thread, al->machine, comm,
err = db_export__thread(dbe, main_thread, al->machine,
main_thread);
if (err)
goto out_put;
/*
* Export comm before exporting the non-main thread because
* db_export__comm_thread() can be called further below.
*/
comm = machine__thread_exec_comm(al->machine, main_thread);
if (comm) {
err = db_export__exec_comm(dbe, comm, main_thread);
if (err)
@ -321,10 +317,21 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
}
if (thread != main_thread) {
err = db_export__thread(dbe, thread, al->machine, comm,
main_thread);
/*
* For a non-main thread, db_export__comm_thread() must be
* called only if thread has not previously been exported.
*/
bool export_comm_thread = comm && !thread->db_id;
err = db_export__thread(dbe, thread, al->machine, main_thread);
if (err)
goto out_put;
if (export_comm_thread) {
err = db_export__comm_thread(dbe, comm, thread);
if (err)
goto out_put;
}
}
es.db_id = ++dbe->sample_last_db_id;

3
tools/perf/util/db-export.h
View File

@ -75,8 +75,7 @@ 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);
int db_export__thread(struct db_export *dbe, struct thread *thread,
struct machine *machine, struct comm *comm,
struct thread *main_thread);
struct machine *machine, struct thread *main_thread);
int db_export__exec_comm(struct db_export *dbe, struct comm *comm,
struct thread *main_thread);
int db_export__comm_thread(struct db_export *dbe, struct comm *comm,