From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dy1-f202.google.com (mail-dy1-f202.google.com [74.125.82.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DE04E4D9902 for ; Thu, 11 Jun 2026 22:45:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781217935; cv=none; b=IjMSpwc5HToBAYustnLuqf5eW3B01LDR5M3WMnaqshNaxHSdb3GmUDqCOyqwOKobijtfind47NsrxQinfRB3Stf5TaOa4zKy8MQgL38XretNNP6W4C1N0S/aaGWAmp7M4d35lQ40VAmf2FI5oG8Git057hacl9chcMzCbaMCgts= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781217935; c=relaxed/simple; bh=YPTkly9vwX/gJ6QECl6zeVDpD4How8v5svCAGRCcoxc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=hAhoBS0hfp+ADqKiwy/VwJPj9tkARVCORCcDGhhNa3u8xmKp+KVdzrMJr7HRwCU1cB/afDTuZiH82WUH0aqVwh2Mq8LPEW0PR2fpTY/LruxO4l6YaAVmdr3a2T4ZghqGwJaYr3hpC+ZQo7/HTcqBlKfqp4YP2pYdsBRkwPhD1U0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=tUZ73c4F; arc=none smtp.client-ip=74.125.82.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tUZ73c4F" Received: by mail-dy1-f202.google.com with SMTP id 5a478bee46e88-30761ab3483so1588187eec.0 for ; Thu, 11 Jun 2026 15:45:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1781217932; x=1781822732; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=8jEXxT8LtrtX69B2FMjTuoLg3cqN4itMr5kg2Saj4c8=; b=tUZ73c4Ftdq/7h5u5/wtmrYDwSIom7PXBsH5U9q7C1XV1ChpeyJG6PEaYg1EEp3HvV i9dBKCh4NESFXoBjzEr7EyzQXJNM43y96a/wDrvDDzkc/8r/1WZoRDPwaZ5lzZdw64+4 8Dpk59ONlIOMYaSO2c9mXSDolLEpQLhmpmZI3Fm5oNmXReI15PnZ5nIQdWOU08P4bMXw 7grqdyYf/gqJ22AYAalZaectzQTEf8UIFO4feZESq98Q4az7AKT9K6dfNt7hz6LLiIR2 x/KwLKH76i5ruJER4Nw+5CYyRfV1lA6Jnrcj6UbMOpntG8xl5Y2RktTJjUd9r2Nq4RWC U95Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1781217932; x=1781822732; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=8jEXxT8LtrtX69B2FMjTuoLg3cqN4itMr5kg2Saj4c8=; b=bOHCv07EdwoEyHpTxLqOnSKMkSyLpJ5ktoCe9zevyJvQHpiFrJAyAHMS6Q5y1h/hnN FxHo2ILcs06gH/uJKYIC3CsliVKhuhFlcDbxmsokomVwVDXxk49tvkHbsaBI08JuU7Pq QX5K6b4L1Hch92hWm7D2f+sXNHDOA9lhJs9kN5RqnfRUWBUHJctrLNXLYVpsCKZMDqBV k5uHUuh7SiGqgtEs9fhS9xZvuyWTr1JWqr8IU6SpX9chVcx+ea89m1ZT13p/PK95gBQ7 /GWv04zebvo8yjI8SYYNUaUXV00+WiNCAkIW2GTSBLtVDpxkF6wpYroeyD2esUyFxckC uzsg== X-Forwarded-Encrypted: i=1; AFNElJ+jXfJY9MFTy8T4fum3qggQ8OjgCjTtI1He/3/ZCOrARA/++LrHzCAzaB14uHzd2U2G8L+b2GmdeQkhsVKDK98q@vger.kernel.org X-Gm-Message-State: AOJu0YzeB9l2Ks/tvH210Vl1kyS2e4VraY72NGJIOsGvNZpPz/3ZM+TX ZmXGz3KQ15/TFl2LLB95lVFIoDFRKNAaPO5lkhrNDAfCYp1HCboxFiydmElmQ5pZb3P0eRDcg2d 7pID720wVkg== X-Received: from dyjt21.prod.google.com ([2002:a05:7300:7b15:b0:304:ee5b:e1a5]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:7300:a10b:b0:2e7:c701:aa85 with SMTP id 5a478bee46e88-30820054ddamr238441eec.17.1781217931690; Thu, 11 Jun 2026 15:45:31 -0700 (PDT) Date: Thu, 11 Jun 2026 15:44:51 -0700 In-Reply-To: <20260611224455.201994-1-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: <20260611171756.4008769-1-irogers@google.com> <20260611224455.201994-1-irogers@google.com> X-Mailer: git-send-email 2.54.0.1136.gdb2ca164c4-goog Message-ID: <20260611224455.201994-16-irogers@google.com> Subject: [PATCH v13 15/19] perf python: Expose brstack in sample event From: Ian Rogers To: irogers@google.com Cc: acme@kernel.org, adrian.hunter@intel.com, alice.mei.rogers@gmail.com, dapeng1.mi@linux.intel.com, james.clark@linaro.org, leo.yan@linux.dev, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, tmricht@linux.ibm.com Content-Type: text/plain; charset="UTF-8" Implement pyrf_branch_entry and pyrf_branch_stack for lazy iteration over branch stack entries. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers --- v2: 1. Avoided Keyword Collision: Renamed the properties "from" and "to" to "from_ip" and "to_ip" in pyrf_branch_entry__getset[] to prevent syntax errors in Python. 2. Eager Branch Stack Resolution: Updated pyrf_session_tool__sample() to allocate and copy the branch stack entries eagerly when the event is processed, instead of deferring it to iteration time. This avoids reading from potentially overwritten or unmapped mmap buffers. 3. Updated Iterators: Updated pyrf_branch_stack and pyrf_branch_stack__next() to use the copied entries rather than pointing directly to the sample's buffer. 4. Avoided Reference Leak on Init Failure: Added proper error checking for PyModule_AddObject() in the module initialization function, decrementing references on failure. v6: - Moved branch stack resolution from `session_tool__sample` to `pyrf_event__new`. --- tools/perf/util/python.c | 198 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c index 16e415bd4a16..56449183a9e7 100644 --- a/tools/perf/util/python.c +++ b/tools/perf/util/python.c @@ -22,6 +22,7 @@ #include "debug.h" #include "dso.h" #include "event.h" +#include "branch.h" #include "evlist.h" #include "evsel.h" #include "expr.h" @@ -89,6 +90,8 @@ struct pyrf_event { bool al_resolved; /** @callchain: Resolved callchain, eagerly computed if requested. */ PyObject *callchain; + /** @brstack: Resolved branch stack, eagerly computed if requested. */ + PyObject *brstack; /** @event: The underlying perf_event that may be in a file or ring buffer. */ union perf_event event; }; @@ -127,6 +130,7 @@ static void pyrf_event__delete(struct pyrf_event *pevent) if (pevent->al_resolved) addr_location__exit(&pevent->al); Py_XDECREF(pevent->callchain); + Py_XDECREF(pevent->brstack); perf_sample__exit(&pevent->sample); Py_TYPE(pevent)->tp_free((PyObject *)pevent); } @@ -997,6 +1001,154 @@ static PyObject *pyrf_sample_event__get_callchain(PyObject *self, void *closure return pevent->callchain; } +struct pyrf_branch_entry { + PyObject_HEAD + u64 from; + u64 to; + struct branch_flags flags; +}; + +static void pyrf_branch_entry__delete(struct pyrf_branch_entry *pentry) +{ + Py_TYPE(pentry)->tp_free((PyObject *)pentry); +} + +static PyObject *pyrf_branch_entry__get_from(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyLong_FromUnsignedLongLong(pentry->from); +} + +static PyObject *pyrf_branch_entry__get_to(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyLong_FromUnsignedLongLong(pentry->to); +} + +static PyObject *pyrf_branch_entry__get_mispred(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyBool_FromLong(pentry->flags.mispred); +} + +static PyObject *pyrf_branch_entry__get_predicted(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyBool_FromLong(pentry->flags.predicted); +} + +static PyObject *pyrf_branch_entry__get_in_tx(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyBool_FromLong(pentry->flags.in_tx); +} + +static PyObject *pyrf_branch_entry__get_abort(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyBool_FromLong(pentry->flags.abort); +} + +static PyObject *pyrf_branch_entry__get_cycles(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyLong_FromUnsignedLongLong(pentry->flags.cycles); +} + +static PyObject *pyrf_branch_entry__get_type(struct pyrf_branch_entry *pentry, + void *closure __maybe_unused) +{ + return PyLong_FromLong(pentry->flags.type); +} + +static PyGetSetDef pyrf_branch_entry__getset[] = { + { .name = "from_ip", .get = (getter)pyrf_branch_entry__get_from, }, + { .name = "to_ip", .get = (getter)pyrf_branch_entry__get_to, }, + { .name = "mispred", .get = (getter)pyrf_branch_entry__get_mispred, }, + { .name = "predicted", .get = (getter)pyrf_branch_entry__get_predicted, }, + { .name = "in_tx", .get = (getter)pyrf_branch_entry__get_in_tx, }, + { .name = "abort", .get = (getter)pyrf_branch_entry__get_abort, }, + { .name = "cycles", .get = (getter)pyrf_branch_entry__get_cycles, }, + { .name = "type", .get = (getter)pyrf_branch_entry__get_type, }, + { .name = NULL, }, +}; + +static PyTypeObject pyrf_branch_entry__type = { + PyVarObject_HEAD_INIT(NULL, 0) + .tp_name = "perf.branch_entry", + .tp_basicsize = sizeof(struct pyrf_branch_entry), + .tp_dealloc = (destructor)pyrf_branch_entry__delete, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_doc = "perf branch entry object.", + .tp_getset = pyrf_branch_entry__getset, +}; + +struct pyrf_branch_stack { + PyObject_HEAD + struct branch_entry *entries; + u64 nr; +}; + +static void pyrf_branch_stack__delete(struct pyrf_branch_stack *pstack) +{ + free(pstack->entries); + Py_TYPE(pstack)->tp_free((PyObject *)pstack); +} + +static Py_ssize_t pyrf_branch_stack__length(PyObject *obj) +{ + struct pyrf_branch_stack *pstack = (void *)obj; + + return pstack->nr; +} + +static PyObject *pyrf_branch_stack__item(PyObject *obj, Py_ssize_t i) +{ + struct pyrf_branch_stack *pstack = (void *)obj; + struct pyrf_branch_entry *pentry; + + if (i < 0 || i >= (Py_ssize_t)pstack->nr) { + PyErr_SetString(PyExc_IndexError, "Index out of range"); + return NULL; + } + + pentry = PyObject_New(struct pyrf_branch_entry, &pyrf_branch_entry__type); + if (!pentry) + return NULL; + + pentry->from = pstack->entries[i].from; + pentry->to = pstack->entries[i].to; + pentry->flags = pstack->entries[i].flags; + + return (PyObject *)pentry; +} + +static PySequenceMethods pyrf_branch_stack__sequence_methods = { + .sq_length = pyrf_branch_stack__length, + .sq_item = pyrf_branch_stack__item, +}; + +static PyTypeObject pyrf_branch_stack__type = { + PyVarObject_HEAD_INIT(NULL, 0) + .tp_name = "perf.branch_stack", + .tp_basicsize = sizeof(struct pyrf_branch_stack), + .tp_dealloc = (destructor)pyrf_branch_stack__delete, + .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE, + .tp_doc = "perf branch stack object.", + .tp_as_sequence = &pyrf_branch_stack__sequence_methods, +}; + +static PyObject *pyrf_sample_event__get_brstack(PyObject *self, void *closure __maybe_unused) +{ + struct pyrf_event *pevent = (void *)self; + + if (!pevent->brstack) + Py_RETURN_NONE; + + Py_INCREF(pevent->brstack); + return pevent->brstack; +} + static PyObject* pyrf_sample_event__getattro(struct pyrf_event *pevent, PyObject *attr_name) { @@ -1017,6 +1169,12 @@ static PyGetSetDef pyrf_sample_event__getset[] = { .set = NULL, .doc = "event callchain.", }, + { + .name = "brstack", + .get = pyrf_sample_event__get_brstack, + .set = NULL, + .doc = "event branch stack.", + }, { .name = "raw_buf", .get = (getter)pyrf_sample_event__get_raw_buf, @@ -1198,6 +1356,12 @@ static int pyrf_event__setup_types(void) err = PyType_Ready(&pyrf_callchain__type); if (err < 0) goto out; + err = PyType_Ready(&pyrf_branch_entry__type); + if (err < 0) + goto out; + err = PyType_Ready(&pyrf_branch_stack__type); + if (err < 0) + goto out; out: return err; } @@ -1277,6 +1441,7 @@ static PyObject *pyrf_event__new(const union perf_event *event, struct evsel *ev perf_sample__init(&pevent->sample, /*all=*/true); pevent->callchain = NULL; + pevent->brstack = NULL; pevent->al_resolved = false; addr_location__init(&pevent->al); @@ -1334,6 +1499,27 @@ static PyObject *pyrf_event__new(const union perf_event *event, struct evsel *ev addr_location__exit(&al); } } + if (sample->branch_stack) { + struct branch_stack *bs = sample->branch_stack; + struct branch_entry *entries = perf_sample__branch_entries(sample); + struct pyrf_branch_stack *pstack; + + pstack = PyObject_New(struct pyrf_branch_stack, &pyrf_branch_stack__type); + if (!pstack) { + Py_DECREF(pevent); + return NULL; + } + pstack->nr = bs->nr; + pstack->entries = calloc(bs->nr, sizeof(struct branch_entry)); + if (!pstack->entries) { + Py_DECREF(pstack); + Py_DECREF(pevent); + return PyErr_NoMemory(); + } + memcpy(pstack->entries, entries, + bs->nr * sizeof(struct branch_entry)); + pevent->brstack = (PyObject *)pstack; + } return (PyObject *)pevent; } @@ -3897,6 +4083,18 @@ PyMODINIT_FUNC PyInit_perf(void) Py_INCREF(&pyrf_session__type); PyModule_AddObject(module, "session", (PyObject *)&pyrf_session__type); + Py_INCREF(&pyrf_branch_entry__type); + if (PyModule_AddObject(module, "branch_entry", (PyObject *)&pyrf_branch_entry__type) < 0) { + Py_DECREF(&pyrf_branch_entry__type); + goto error; + } + + Py_INCREF(&pyrf_branch_stack__type); + if (PyModule_AddObject(module, "branch_stack", (PyObject *)&pyrf_branch_stack__type) < 0) { + Py_DECREF(&pyrf_branch_stack__type); + goto error; + } + dict = PyModule_GetDict(module); if (dict == NULL) goto error; -- 2.54.0.1136.gdb2ca164c4-goog