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Date: Tue, 2 May 2023 13:37:04 -0700
From: Ian Rogers <irogers@...gle.com>
To: Jinli Xiao <jinli.xiao@....edu>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Leo Yan <leo.yan@...aro.org>,
Suzuki Poulouse <suzuki.poulose@....com>,
James Clark <james.clark@....com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf python: Set error messages on call failure
On Tue, May 2, 2023 at 1:31 PM Jinli Xiao <jinli.xiao@....edu> wrote:
>
> Updates the perf python binding to provide more informative error
> messages to the user when there is a call failure. The changes include
> setting error messages on several different scenarios when the package
> needs to return -1 or NULL.
>
> Signed-off-by: Jinli Xiao <jinli.xiao@....edu>
Nice! Would it be possible to test this? We could do a shell test:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/tests/shell
Thanks,
Ian
> ---
> tools/perf/util/python.c | 61 ++++++++++++++++++++++++++++++----------
> 1 file changed, 46 insertions(+), 15 deletions(-)
>
> diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
> index 42e8b813d010..7e6b12e87744 100644
> --- a/tools/perf/util/python.c
> +++ b/tools/perf/util/python.c
> @@ -635,12 +635,16 @@ static int pyrf_cpu_map__init(struct pyrf_cpu_map *pcpus,
> char *cpustr = NULL;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|s",
> - kwlist, &cpustr))
> + kwlist, &cpustr)) {
> + PyErr_BadArgument();
> return -1;
> + }
>
> pcpus->cpus = perf_cpu_map__new(cpustr);
> - if (pcpus->cpus == NULL)
> + if (pcpus->cpus == NULL) {
> + PyErr_SetFromErrno(PyExc_OSError);
> return -1;
> + }
> return 0;
> }
>
> @@ -704,12 +708,16 @@ static int pyrf_thread_map__init(struct pyrf_thread_map *pthreads,
> int pid = -1, tid = -1, uid = UINT_MAX;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|iii",
> - kwlist, &pid, &tid, &uid))
> + kwlist, &pid, &tid, &uid)) {
> + PyErr_BadArgument();
> return -1;
> + }
>
> pthreads->threads = thread_map__new(pid, tid, uid);
> - if (pthreads->threads == NULL)
> + if (pthreads->threads == NULL) {
> + PyErr_SetFromErrno(PyExc_OSError);
> return -1;
> + }
> return 0;
> }
>
> @@ -839,13 +847,18 @@ static int pyrf_evsel__init(struct pyrf_evsel *pevsel,
> &enable_on_exec, &task, &watermark,
> &precise_ip, &mmap_data, &sample_id_all,
> &attr.wakeup_events, &attr.bp_type,
> - &attr.bp_addr, &attr.bp_len, &idx))
> + &attr.bp_addr, &attr.bp_len, &idx)) {
> + PyErr_BadArgument();
> return -1;
> + }
>
> /* union... */
> if (sample_period != 0) {
> - if (attr.sample_freq != 0)
> - return -1; /* FIXME: throw right exception */
> + if (attr.sample_freq != 0) {
> + PyErr_SetString(PyExc_ValueError,
> + "perf: sample_freq and sample_period are mutually exclusive");
> + return -1;
> + }
> attr.sample_period = sample_period;
> }
>
> @@ -892,8 +905,10 @@ static PyObject *pyrf_evsel__open(struct pyrf_evsel *pevsel,
> static char *kwlist[] = { "cpus", "threads", "group", "inherit", NULL };
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOii", kwlist,
> - &pcpus, &pthreads, &group, &inherit))
> + &pcpus, &pthreads, &group, &inherit)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> if (pthreads != NULL)
> threads = ((struct pyrf_thread_map *)pthreads)->threads;
> @@ -957,8 +972,10 @@ static int pyrf_evlist__init(struct pyrf_evlist *pevlist,
> struct perf_cpu_map *cpus;
> struct perf_thread_map *threads;
>
> - if (!PyArg_ParseTuple(args, "OO", &pcpus, &pthreads))
> + if (!PyArg_ParseTuple(args, "OO", &pcpus, &pthreads)) {
> + PyErr_BadArgument();
> return -1;
> + }
>
> threads = ((struct pyrf_thread_map *)pthreads)->threads;
> cpus = ((struct pyrf_cpu_map *)pcpus)->cpus;
> @@ -980,8 +997,10 @@ static PyObject *pyrf_evlist__mmap(struct pyrf_evlist *pevlist,
> int pages = 128, overwrite = false;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ii", kwlist,
> - &pages, &overwrite))
> + &pages, &overwrite)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> if (evlist__mmap(evlist, pages) < 0) {
> PyErr_SetFromErrno(PyExc_OSError);
> @@ -999,8 +1018,10 @@ static PyObject *pyrf_evlist__poll(struct pyrf_evlist *pevlist,
> static char *kwlist[] = { "timeout", NULL };
> int timeout = -1, n;
>
> - if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", kwlist, &timeout))
> + if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", kwlist, &timeout)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> n = evlist__poll(evlist, timeout);
> if (n < 0) {
> @@ -1057,8 +1078,10 @@ static PyObject *pyrf_evlist__add(struct pyrf_evlist *pevlist,
> PyObject *pevsel;
> struct evsel *evsel;
>
> - if (!PyArg_ParseTuple(args, "O", &pevsel))
> + if (!PyArg_ParseTuple(args, "O", &pevsel)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> Py_INCREF(pevsel);
> evsel = &((struct pyrf_evsel *)pevsel)->evsel;
> @@ -1093,12 +1116,16 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
> int err;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "i|i", kwlist,
> - &cpu, &sample_id_all))
> + &cpu, &sample_id_all)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> md = get_md(evlist, cpu);
> - if (!md)
> + if (!md) {
> + PyErr_SetFromErrno(PyExc_OSError);
> return NULL;
> + }
>
> if (perf_mmap__read_init(&md->core) < 0)
> goto end;
> @@ -1324,6 +1351,8 @@ static PyObject *pyrf__tracepoint(struct pyrf_evsel *pevsel,
> PyObject *args, PyObject *kwargs)
> {
> #ifndef HAVE_LIBTRACEEVENT
> + PyErr_SetString(PyExc_OSError,
> + "perf: tracepoint support not compiled in");
> return NULL;
> #else
> struct tep_event *tp_format;
> @@ -1332,8 +1361,10 @@ static PyObject *pyrf__tracepoint(struct pyrf_evsel *pevsel,
> char *name = NULL;
>
> if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ss", kwlist,
> - &sys, &name))
> + &sys, &name)) {
> + PyErr_BadArgument();
> return NULL;
> + }
>
> tp_format = trace_event__tp_format(sys, name);
> if (IS_ERR(tp_format))
> --
> 2.39.2
>
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