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perf python: Add evsel read method

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Add the evsel read method to enable python to read counter data for the
given evsel.

Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/linux-perf-users/20250512055748.479786-1-gautam@linux.ibm.com/
Link: https://lore.kernel.org/r/20250519195148.1708988-6-irogers@google.com
[ make the API take a CPU and thread then compute from these the appropriate indices. ]
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Gautam Menghani 2025-05-19 12:51:42 -07:00 • committed by Arnaldo Carvalho de Melo
parent 3b4991dcb4
commit 739621f657
1 changed files with 37 additions and 0 deletions
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37
tools/perf/util/python.c
View file

@ -888,6 +888,37 @@ static PyObject *pyrf_evsel__threads(struct pyrf_evsel *pevsel)
return (PyObject *)pthread_map;
}
static PyObject *pyrf_evsel__read(struct pyrf_evsel *pevsel,
PyObject *args, PyObject *kwargs)
{
struct evsel *evsel = &pevsel->evsel;
int cpu = 0, cpu_idx, thread = 0, thread_idx;
struct perf_counts_values counts;
struct pyrf_counts_values *count_values = PyObject_New(struct pyrf_counts_values,
&pyrf_counts_values__type);
if (!count_values)
return NULL;
if (!PyArg_ParseTuple(args, "ii", &cpu, &thread))
return NULL;
cpu_idx = perf_cpu_map__idx(evsel->core.cpus, (struct perf_cpu){.cpu = cpu});
if (cpu_idx < 0) {
PyErr_Format(PyExc_TypeError, "CPU %d is not part of evsel's CPUs", cpu);
return NULL;
}
thread_idx = perf_thread_map__idx(evsel->core.threads, thread);
if (cpu_idx < 0) {
PyErr_Format(PyExc_TypeError, "Thread %d is not part of evsel's threads",
thread);
return NULL;
}
perf_evsel__read(&(evsel->core), cpu_idx, thread_idx, &counts);
count_values->values = counts;
return (PyObject *)count_values;
}
static PyObject *pyrf_evsel__str(PyObject *self)
{
struct pyrf_evsel *pevsel = (void *)self;
@ -918,6 +949,12 @@ static PyMethodDef pyrf_evsel__methods[] = {
.ml_flags = METH_NOARGS,
.ml_doc = PyDoc_STR("threads the event is to be used with.")
},
{
.ml_name = "read",
.ml_meth = (PyCFunction)pyrf_evsel__read,
.ml_flags = METH_VARARGS | METH_KEYWORDS,
.ml_doc = PyDoc_STR("read counters")
},
{ .ml_name = NULL, }
};