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perf db-export: Pass main_thread to db_export__thread() 

Calls to db_export__thread() already have main_thread so there is no
reason to get it again, instead pass it as a parameter. Note that one
difference in this approach is that the main thread is not created if it
does not exist. It is better if it is not created because:

   - If main_thread is being traced it will have been created already.

   - If it is not being traced, there will be no other information about
     it, and it will never get deleted because there will be no EXIT event.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-07-10 11:57:52 +03:00 committed by Arnaldo Carvalho de Melo
parent 208032fef1
commit ed5c0a16fe
2 changed files with 10 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
tools/perf/util/db-export.c
View File

@ -59,9 +59,9 @@ int db_export__machine(struct db_export *dbe, struct machine *machine)
} }
int db_export__thread(struct db_export *dbe, struct thread *thread, int db_export__thread(struct db_export *dbe, struct thread *thread,
struct machine *machine, struct comm *comm) struct machine *machine, struct comm *comm,
struct thread *main_thread)
{ {
struct thread *main_thread;
u64 main_thread_db_id = 0; u64 main_thread_db_id = 0;
int err; int err;
@ -70,28 +70,19 @@ int db_export__thread(struct db_export *dbe, struct thread *thread,
thread->db_id = ++dbe->thread_last_db_id; thread->db_id = ++dbe->thread_last_db_id;
if (thread->pid_ != -1) { if (main_thread) {
if (thread->pid_ == thread->tid) { if (main_thread != thread) {
main_thread = thread;
} else {
main_thread = machine__findnew_thread(machine,
thread->pid_,
thread->pid_);
if (!main_thread)
return -ENOMEM;
err = db_export__thread(dbe, main_thread, machine, err = db_export__thread(dbe, main_thread, machine,
comm); comm, main_thread);
if (err) if (err)
goto out_put; return err;
if (comm) { if (comm) {
err = db_export__comm_thread(dbe, comm, thread); err = db_export__comm_thread(dbe, comm, thread);
if (err) if (err)
goto out_put; return err;
} }
} }
main_thread_db_id = main_thread->db_id; main_thread_db_id = main_thread->db_id;
if (main_thread != thread)
thread__put(main_thread);
} }
if (dbe->export_thread) if (dbe->export_thread)
@ -99,10 +90,6 @@ int db_export__thread(struct db_export *dbe, struct thread *thread,
machine); machine);
return 0; return 0;
out_put:
thread__put(main_thread);
return err;
} }
/* /*
@ -324,7 +311,7 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
if (main_thread) if (main_thread)
comm = machine__thread_exec_comm(al->machine, main_thread); comm = machine__thread_exec_comm(al->machine, main_thread);
err = db_export__thread(dbe, thread, al->machine, comm); err = db_export__thread(dbe, thread, al->machine, comm, main_thread);
if (err) if (err)
goto out_put; goto out_put;

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

@ -75,7 +75,8 @@ void db_export__exit(struct db_export *dbe);
int db_export__evsel(struct db_export *dbe, struct perf_evsel *evsel); 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__machine(struct db_export *dbe, struct machine *machine);
int db_export__thread(struct db_export *dbe, struct thread *thread, int db_export__thread(struct db_export *dbe, struct thread *thread,
struct machine *machine, struct comm *comm); struct machine *machine, struct comm *comm,
struct thread *main_thread);
int db_export__exec_comm(struct db_export *dbe, struct comm *comm, int db_export__exec_comm(struct db_export *dbe, struct comm *comm,
struct thread *main_thread); struct thread *main_thread);
int db_export__comm_thread(struct db_export *dbe, struct comm *comm, int db_export__comm_thread(struct db_export *dbe, struct comm *comm,