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AFNElJ+tebYH52lHSoWqZK3U/h1zGy0gbpUhVaB2n7AHOqwB8WLQoKcGgGcV4+XDUCvK5DmS9xkRAZvMYuZ2H3so3/SI@vger.kernel.org X-Gm-Message-State: AOJu0YwkZn6Mi5Jx4tgqmGSWVgmR6b0PlbNm4cOpH8VQv+tV98jHTmhg w5wXevRqDOMAl7dPsuqNK9hY46FFVI1PF8gvVIVzHY2HFM/cyou6zfVLC/QliHFYXwD1Zm7sEFg J5TV1lZzJyQ== X-Received: from dyfv9.prod.google.com ([2002:a05:7300:8249:b0:2df:7541:1895]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7301:1292:b0:2c0:c415:cfd6 with SMTP id 5a478bee46e88-2e47873bca2mr5611154eec.13.1776643201232; Sun, 19 Apr 2026 17:00:01 -0700 (PDT) Date: Sun, 19 Apr 2026 16:58:30 -0700 In-Reply-To: <20260419235911.2186050-1-irogers@google.com> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260419235911.2186050-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.rc1.513.gad8abe7a5a-goog Message-ID: <20260419235911.2186050-19-irogers@google.com> Subject: [PATCH v1 18/58] perf python: Add callchain support From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Adrian Hunter , James Clark , Alice Rogers , Suzuki K Poulose , Mike Leach , John Garry , Leo Yan , Yicong Yang , Jonathan Cameron , Nick Terrell , David Sterba , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Alexandre Chartre , Dmitrii Dolgov <9erthalion6@gmail.com>, Yuzhuo Jing , Blake Jones , Changbin Du , Gautam Menghani , Wangyang Guo , Pan Deng , Zhiguo Zhou , Tianyou Li , Thomas Falcon , Athira Rajeev , Collin Funk , Dapeng Mi , Ravi Bangoria , Zecheng Li , tanze , Thomas Richter , Ankur Arora , "Tycho Andersen (AMD)" , Howard Chu , Sun Jian , Derek Foreman , Swapnil Sapkal , Anubhav Shelat , Ricky Ringler , Qinxin Xia , Aditya Bodkhe , Chun-Tse Shao , Stephen Brennan , Yang Li , Chuck Lever , Chen Ni , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org Cc: Ian Rogers Content-Type: text/plain; charset="UTF-8" Implement pyrf_callchain_node and pyrf_callchain types for lazy iteration over callchain frames. Add callchain property to sample_event. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- tools/perf/util/python.c | 202 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 09b566707563..6baf38a08690 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -609,6 +609,193 @@ static PyObject *pyrf_sample_event__insn(PyObject *self, PyObject *args __maybe_ pevent->sample.insn_len); } +struct pyrf_callchain_node { + PyObject_HEAD + u64 ip; + struct map *map; + struct symbol *sym; +}; + +static void pyrf_callchain_node__delete(struct pyrf_callchain_node *pnode) +{ + map__put(pnode->map); + Py_TYPE(pnode)->tp_free((PyObject*)pnode); +} + +static PyObject *pyrf_callchain_node__get_ip(struct pyrf_callchain_node *pnode, + void *closure __maybe_unused) +{ + return PyLong_FromUnsignedLongLong(pnode->ip); +} + +static PyObject *pyrf_callchain_node__get_symbol(struct pyrf_callchain_node *pnode, + void *closure __maybe_unused) +{ + if (pnode->sym) + return PyUnicode_FromString(pnode->sym->name); + return PyUnicode_FromString("[unknown]"); +} + +static PyObject *pyrf_callchain_node__get_dso(struct pyrf_callchain_node *pnode, + void *closure __maybe_unused) +{ + const char *dsoname = "[unknown]"; + + if (pnode->map) { + struct dso *dso = map__dso(pnode->map); + if (dso) { + if (symbol_conf.show_kernel_path && dso__long_name(dso)) + dsoname = dso__long_name(dso); + else + dsoname = dso__name(dso); + } + } + return PyUnicode_FromString(dsoname); +} + +static PyGetSetDef pyrf_callchain_node__getset[] = { + { .name = "ip", .get = (getter)pyrf_callchain_node__get_ip, }, + { .name = "symbol", .get = (getter)pyrf_callchain_node__get_symbol, }, + { .name = "dso", .get = (getter)pyrf_callchain_node__get_dso, }, + { .name = NULL, }, +}; + +static PyTypeObject pyrf_callchain_node__type = { + PyVarObject_HEAD_INIT(NULL, 0) + .tp_name = "perf.callchain_node", + .tp_basicsize = sizeof(struct pyrf_callchain_node), + .tp_dealloc = (destructor)pyrf_callchain_node__delete, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_doc = "perf callchain node object.", + .tp_getset = pyrf_callchain_node__getset, +}; + +struct pyrf_callchain_frame { + u64 ip; + struct map *map; + struct symbol *sym; +}; + +struct pyrf_callchain { + PyObject_HEAD + struct pyrf_event *pevent; + struct pyrf_callchain_frame *frames; + u64 nr_frames; + u64 pos; + bool resolved; +}; + +static void pyrf_callchain__delete(struct pyrf_callchain *pchain) +{ + Py_XDECREF(pchain->pevent); + if (pchain->frames) { + for (u64 i = 0; i < pchain->nr_frames; i++) + map__put(pchain->frames[i].map); + free(pchain->frames); + } + Py_TYPE(pchain)->tp_free((PyObject*)pchain); +} + +static PyObject *pyrf_callchain__next(struct pyrf_callchain *pchain) +{ + struct pyrf_callchain_node *pnode; + + if (!pchain->resolved) { + struct evsel *evsel = pchain->pevent->sample.evsel; + struct evlist *evlist = evsel->evlist; + struct perf_session *session = evlist ? evlist->session : NULL; + struct addr_location al; + struct callchain_cursor *cursor; + struct callchain_cursor_node *node; + u64 i; + + if (!session || !pchain->pevent->sample.callchain) + return NULL; + + addr_location__init(&al); + if (machine__resolve(&session->machines.host, &al, &pchain->pevent->sample) < 0) { + addr_location__exit(&al); + return NULL; + } + + cursor = get_tls_callchain_cursor(); + if (thread__resolve_callchain(al.thread, cursor, evsel, + &pchain->pevent->sample, NULL, NULL, + PERF_MAX_STACK_DEPTH) != 0) { + addr_location__exit(&al); + return NULL; + } + callchain_cursor_commit(cursor); + + pchain->nr_frames = cursor->nr; + if (pchain->nr_frames > 0) { + pchain->frames = calloc(pchain->nr_frames, sizeof(*pchain->frames)); + if (!pchain->frames) { + addr_location__exit(&al); + return PyErr_NoMemory(); + } + + for (i = 0; i < pchain->nr_frames; i++) { + node = callchain_cursor_current(cursor); + pchain->frames[i].ip = node->ip; + pchain->frames[i].map = map__get(node->ms.map); + pchain->frames[i].sym = node->ms.sym; + callchain_cursor_advance(cursor); + } + } + pchain->resolved = true; + addr_location__exit(&al); + } + + if (pchain->pos >= pchain->nr_frames) + return NULL; + + pnode = PyObject_New(struct pyrf_callchain_node, &pyrf_callchain_node__type); + if (!pnode) + return NULL; + + pnode->ip = pchain->frames[pchain->pos].ip; + pnode->map = map__get(pchain->frames[pchain->pos].map); + pnode->sym = pchain->frames[pchain->pos].sym; + + pchain->pos++; + return (PyObject *)pnode; +} + +static PyTypeObject pyrf_callchain__type = { + PyVarObject_HEAD_INIT(NULL, 0) + .tp_name = "perf.callchain", + .tp_basicsize = sizeof(struct pyrf_callchain), + .tp_dealloc = (destructor)pyrf_callchain__delete, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_doc = "perf callchain object.", + .tp_iter = PyObject_SelfIter, + .tp_iternext = (iternextfunc)pyrf_callchain__next, +}; + +static PyObject *pyrf_sample_event__get_callchain(PyObject *self, void */*closure*/) +{ + struct pyrf_event *pevent = (void *)self; + struct pyrf_callchain *pchain; + + if (!pevent->sample.callchain) { + Py_INCREF(Py_None); + return Py_None; + } + + pchain = PyObject_New(struct pyrf_callchain, &pyrf_callchain__type); + if (!pchain) + return NULL; + + Py_INCREF(pevent); + pchain->pevent = pevent; + pchain->frames = NULL; + pchain->nr_frames = 0; + pchain->pos = 0; + pchain->resolved = false; + return (PyObject *)pchain; +} + static PyObject* pyrf_sample_event__getattro(struct pyrf_event *pevent, PyObject *attr_name) { @@ -623,6 +810,12 @@ pyrf_sample_event__getattro(struct pyrf_event *pevent, PyObject *attr_name) } static PyGetSetDef pyrf_sample_event__getset[] = { + { + .name = "callchain", + .get = pyrf_sample_event__get_callchain, + .set = NULL, + .doc = "event callchain.", + }, { .name = "raw_buf", .get = (getter)pyrf_sample_event__get_raw_buf, @@ -791,6 +984,12 @@ static int pyrf_event__setup_types(void) err = PyType_Ready(&pyrf_context_switch_event__type); if (err < 0) goto out; + err = PyType_Ready(&pyrf_callchain_node__type); + if (err < 0) + goto out; + err = PyType_Ready(&pyrf_callchain__type); + if (err < 0) + goto out; out: return err; } @@ -2836,6 +3035,9 @@ static int pyrf_session__init(struct pyrf_session *psession, PyObject *args, PyO return -1; } + symbol_conf.use_callchain = true; + symbol_conf.show_kernel_path = true; + symbol_conf.inline_name = false; if (symbol__init(perf_session__env(psession->session)) < 0) { perf_session__delete(psession->session); Py_DECREF(pdata); -- 2.54.0.rc1.513.gad8abe7a5a-goog