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perf db-export: Export switch events 

Export details of switch events including the threads and their current
comms.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-20-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-07-10 11:58:08 +03:00 committed by Arnaldo Carvalho de Melo
parent b3694e6c0a
commit abde8722d9
3 changed files with 138 additions and 0 deletions
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89
tools/perf/util/db-export.c
View File

@ -519,3 +519,92 @@ int db_export__call_return(struct db_export *dbe, struct call_return *cr,
return 0;
}
static int db_export__pid_tid(struct db_export *dbe, struct machine *machine,
pid_t pid, pid_t tid, u64 *db_id,
struct comm **comm_ptr, bool *is_idle)
{
struct thread *thread = machine__find_thread(machine, pid, tid);
struct thread *main_thread;
int err = 0;
if (!thread || !thread->comm_set)
goto out_put;
*is_idle = !thread->pid_ && !thread->tid;
main_thread = thread__main_thread(machine, thread);
err = db_export__threads(dbe, thread, main_thread, machine, comm_ptr);
*db_id = thread->db_id;
thread__put(main_thread);
out_put:
thread__put(thread);
return err;
}
int db_export__switch(struct db_export *dbe, union perf_event *event,
struct perf_sample *sample, struct machine *machine)
{
bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
bool out_preempt = out &&
(event->header.misc & PERF_RECORD_MISC_SWITCH_OUT_PREEMPT);
int flags = out | (out_preempt << 1);
bool is_idle_a = false, is_idle_b = false;
u64 th_a_id = 0, th_b_id = 0;
u64 comm_out_id, comm_in_id;
struct comm *comm_a = NULL;
struct comm *comm_b = NULL;
u64 th_out_id, th_in_id;
u64 db_id;
int err;
err = db_export__machine(dbe, machine);
if (err)
return err;
err = db_export__pid_tid(dbe, machine, sample->pid, sample->tid,
&th_a_id, &comm_a, &is_idle_a);
if (err)
return err;
if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE) {
pid_t pid = event->context_switch.next_prev_pid;
pid_t tid = event->context_switch.next_prev_tid;
err = db_export__pid_tid(dbe, machine, pid, tid, &th_b_id,
&comm_b, &is_idle_b);
if (err)
return err;
}
/*
* Do not export if both threads are unknown (i.e. not being traced),
* or one is unknown and the other is the idle task.
*/
if ((!th_a_id || is_idle_a) && (!th_b_id || is_idle_b))
return 0;
db_id = ++dbe->context_switch_last_db_id;
if (out) {
th_out_id = th_a_id;
th_in_id = th_b_id;
comm_out_id = comm_a ? comm_a->db_id : 0;
comm_in_id = comm_b ? comm_b->db_id : 0;
} else {
th_out_id = th_b_id;
th_in_id = th_a_id;
comm_out_id = comm_b ? comm_b->db_id : 0;
comm_in_id = comm_a ? comm_a->db_id : 0;
}
if (dbe->export_context_switch)
return dbe->export_context_switch(dbe, db_id, machine, sample,
th_out_id, comm_out_id,
th_in_id, comm_in_id, flags);
return 0;
}

8
tools/perf/util/db-export.h
View File

@ -57,6 +57,11 @@ struct db_export {
int (*export_call_path)(struct db_export *dbe, struct call_path *cp);
int (*export_call_return)(struct db_export *dbe,
struct call_return *cr);
int (*export_context_switch)(struct db_export *dbe, u64 db_id,
struct machine *machine,
struct perf_sample *sample,
u64 th_out_id, u64 comm_out_id,
u64 th_in_id, u64 comm_in_id, int flags);
struct call_return_processor *crp;
struct call_path_root *cpr;
u64 evsel_last_db_id;
@ -69,6 +74,7 @@ struct db_export {
u64 sample_last_db_id;
u64 call_path_last_db_id;
u64 call_return_last_db_id;
u64 context_switch_last_db_id;
};
int db_export__init(struct db_export *dbe);
@ -98,5 +104,7 @@ int db_export__branch_types(struct db_export *dbe);
int db_export__call_path(struct db_export *dbe, struct call_path *cp);
int db_export__call_return(struct db_export *dbe, struct call_return *cr,
u64 *parent_db_id);
int db_export__switch(struct db_export *dbe, union perf_event *event,
struct perf_sample *sample, struct machine *machine);
#endif

41
tools/perf/util/scripting-engines/trace-event-python.c
View File

@ -113,6 +113,7 @@ struct tables {
PyObject *call_path_handler;
PyObject *call_return_handler;
PyObject *synth_handler;
PyObject *context_switch_handler;
bool db_export_mode;
};
@ -1237,6 +1238,34 @@ static int python_export_call_return(struct db_export *dbe,
return 0;
}
static int python_export_context_switch(struct db_export *dbe, u64 db_id,
struct machine *machine,
struct perf_sample *sample,
u64 th_out_id, u64 comm_out_id,
u64 th_in_id, u64 comm_in_id, int flags)
{
struct tables *tables = container_of(dbe, struct tables, dbe);
PyObject *t;
t = tuple_new(9);
tuple_set_u64(t, 0, db_id);
tuple_set_u64(t, 1, machine->db_id);
tuple_set_u64(t, 2, sample->time);
tuple_set_s32(t, 3, sample->cpu);
tuple_set_u64(t, 4, th_out_id);
tuple_set_u64(t, 5, comm_out_id);
tuple_set_u64(t, 6, th_in_id);
tuple_set_u64(t, 7, comm_in_id);
tuple_set_s32(t, 8, flags);
call_object(tables->context_switch_handler, t, "context_switch");
Py_DECREF(t);
return 0;
}
static int python_process_call_return(struct call_return *cr, u64 *parent_db_id,
void *data)
{
@ -1300,6 +1329,16 @@ static void python_process_event(union perf_event *event,
}
}
static void python_process_switch(union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct tables *tables = &tables_global;
if (tables->db_export_mode)
db_export__switch(&tables->dbe, event, sample, machine);
}
static void get_handler_name(char *str, size_t size,
struct perf_evsel *evsel)
{
@ -1515,6 +1554,7 @@ static void set_table_handlers(struct tables *tables)
SET_TABLE_HANDLER(sample);
SET_TABLE_HANDLER(call_path);
SET_TABLE_HANDLER(call_return);
SET_TABLE_HANDLER(context_switch);
/*
* Synthesized events are samples but with architecture-specific data
@ -1833,6 +1873,7 @@ struct scripting_ops python_scripting_ops = {
.flush_script = python_flush_script,
.stop_script = python_stop_script,
.process_event = python_process_event,
.process_switch = python_process_switch,
.process_stat = python_process_stat,
.process_stat_interval = python_process_stat_interval,
.generate_script = python_generate_script,