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Subject[PATCH 51/52] perf script: Add python support for stat events
Date
Add support to get stat events data in perf python scripts.

The python script shall implement following
new interface to process stat data:

def stat__<event_name>_[<modifier>](cpu, thread, time, val, ena, run):

- is called for every stat event for given counter,
if user monitors 'cycles,instructions:u" following
callbacks should be defined:

def stat__cycles(cpu, thread, time, val, ena, run):
def stat__instructions_u(cpu, thread, time, val, ena, run):

def stat__interval(time):

- is called for every interval with its time,
in non interval mode it's called after last
stat event with total meassured time in ns

The rest of the current interface stays untouched..

Please check example CPI metrics script in following patch
with command line examples in changelogs.

Link: http://lkml.kernel.org/n/tip-jojiaelyckrw6040wqc06q1j@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
.../util/scripting-engines/trace-event-python.c | 114 +++++++++++++++++++--
1 file changed, 108 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index a8e825fca42a..8436eb23eb16 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -41,6 +41,9 @@
#include "../thread-stack.h"
#include "../trace-event.h"
#include "../machine.h"
+#include "thread_map.h"
+#include "cpumap.h"
+#include "stat.h"

PyMODINIT_FUNC initperf_trace_context(void);

@@ -859,6 +862,103 @@ static void python_process_event(union perf_event *event,
}
}

+static void get_handler_name(char *str, size_t size,
+ struct perf_evsel *evsel)
+{
+ char *p = str;
+
+ scnprintf(str, size, "stat__%s", perf_evsel__name(evsel));
+
+ while ((p = strchr(p, ':'))) {
+ *p = '_';
+ p++;
+ }
+}
+
+static void
+process_stat(struct perf_evsel *counter, int cpu, int thread, u64 time,
+ struct perf_counts_values *count)
+{
+ PyObject *handler, *t;
+ static char handler_name[256];
+ int n = 0;
+
+ t = PyTuple_New(MAX_FIELDS);
+ if (!t)
+ Py_FatalError("couldn't create Python tuple");
+
+ get_handler_name(handler_name, sizeof(handler_name),
+ counter);
+
+ handler = get_handler(handler_name);
+ if (!handler) {
+ pr_debug("can't find python handler %s\n", handler_name);
+ return;
+ }
+
+ PyTuple_SetItem(t, n++, PyInt_FromLong(cpu));
+ PyTuple_SetItem(t, n++, PyInt_FromLong(thread));
+ PyTuple_SetItem(t, n++, PyLong_FromLong(time));
+ PyTuple_SetItem(t, n++, PyLong_FromLong(count->val));
+ PyTuple_SetItem(t, n++, PyLong_FromLong(count->ena));
+ PyTuple_SetItem(t, n++, PyLong_FromLong(count->run));
+
+ if (_PyTuple_Resize(&t, n) == -1)
+ Py_FatalError("error resizing Python tuple");
+
+ call_object(handler, t, handler_name);
+
+ Py_DECREF(t);
+}
+
+static void python_process_stat(struct perf_stat_config *config,
+ struct perf_evsel *counter, u64 time)
+{
+ struct thread_map *threads = counter->threads;
+ struct cpu_map *cpus = counter->cpus;
+ int cpu, thread;
+
+ if (config->aggr_mode == AGGR_GLOBAL) {
+ process_stat(counter, -1, -1, time,
+ &counter->counts->aggr);
+ return;
+ }
+
+ for (thread = 0; thread < threads->nr; thread++) {
+ for (cpu = 0; cpu < cpus->nr; cpu++) {
+ process_stat(counter, cpus->map[cpu],
+ thread_map__pid(threads, thread), time,
+ perf_counts(counter->counts, cpu, thread));
+ }
+ }
+}
+
+static void python_process_stat_interval(u64 time)
+{
+ PyObject *handler, *t;
+ static const char handler_name[] = "stat__interval";
+ int n = 0;
+
+ t = PyTuple_New(MAX_FIELDS);
+ if (!t)
+ Py_FatalError("couldn't create Python tuple");
+
+ handler = get_handler(handler_name);
+ if (!handler) {
+ pr_debug("can't find python handler %s\n", handler_name);
+ return;
+ }
+
+ PyTuple_SetItem(t, n++, PyLong_FromLong(time));
+
+ if (_PyTuple_Resize(&t, n) == -1)
+ Py_FatalError("error resizing Python tuple");
+
+ call_object(handler, t, handler_name);
+
+ Py_DECREF(t);
+}
+
static int run_start_sub(void)
{
main_module = PyImport_AddModule("__main__");
@@ -1201,10 +1301,12 @@ static int python_generate_script(struct pevent *pevent, const char *outfile)
}

struct scripting_ops python_scripting_ops = {
- .name = "Python",
- .start_script = python_start_script,
- .flush_script = python_flush_script,
- .stop_script = python_stop_script,
- .process_event = python_process_event,
- .generate_script = python_generate_script,
+ .name = "Python",
+ .start_script = python_start_script,
+ .flush_script = python_flush_script,
+ .stop_script = python_stop_script,
+ .process_event = python_process_event,
+ .process_stat = python_process_stat,
+ .process_stat_interval = python_process_stat_interval,
+ .generate_script = python_generate_script,
};
--
2.4.3


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