kernel/git/stable/linux.git/tools/perf/util, branch linux-6.14.y

perf tools: Remove evsel__handle_error_quirks()

2025-04-25T08:50:51+00:00

[ Upstream commit 2b70702917337a8d6d07f03eed961e0119091647 ] The evsel__handle_error_quirks() is to fixup invalid event attributes on some architecture based on the error code. Currently it's only used for AMD to disable precise_ip not to use IBS which has more restrictions. But the commit c33aea446bf555ab changed call evsel__precise_ip_fallback for any errors so there's no difference with the above function. To make matter worse, it caused a problem with branch stack on Zen3. The IBS doesn't support branch stack so it should use a regular core PMU event. The default event is set precise_max and it starts with 3. And evsel__precise_ip_fallback() tries with it and reduces the level one by one. At last it tries with 0 but it also failed on Zen3 since the branch stack is not supported for the cycles event. At this point, evsel__precise_ip_fallback() restores the original precise_ip value (3) in the hope that it can succeed with other modifier (like exclude_kernel). Then evsel__handle_error_quirks() see it has precise_ip != 0 and make it retry with 0. This created an infinite loop. Before: $ perf record -b -vv |& grep removing removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD removing precise_ip on AMD ... After: $ perf record -b true Error: Failure to open event 'cycles:P' on PMU 'cpu' which will be removed. Invalid event (cycles:P) in per-thread mode, enable system wide with '-a'. Error: Failure to open any events for recording. Fixes: c33aea446bf555ab ("perf tools: Fix precise_ip fallback logic") Tested-by: Chun-Tse Shao Cc: Ravi Bangoria Link: https://lore.kernel.org/r/20250410010252.402221-1-namhyung@kernel.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf pmu: Rename name matching for no suffix or wildcard variants

2025-04-10T12:44:48+00:00

commit 63e287131cf0c59b026053d6d63fe271604ffa7e upstream. Wildcard PMU naming will match a name like pmu_1 to a PMU name like pmu_10 but not to a PMU name like pmu_2 as the suffix forms part of the match. No suffix matching will match pmu_10 to either pmu_1 or pmu_2. Add or rename matching functions on PMU to make it clearer what kind of matching is being performed. Signed-off-by: Ian Rogers Reviewed-by: Kan Liang Link: https://lore.kernel.org/r/20250201074320.746259-4-irogers@google.com Signed-off-by: Namhyung Kim Signed-off-by: Greg Kroah-Hartman

perf bpf-filter: Fix a parsing error with comma

2025-04-10T12:44:34+00:00

[ Upstream commit 35d13f841a3d8159ef20d5e32a9ed3faa27875bc ] The previous change to support cgroup filters introduced a bug that pathname can include commas. It confused the lexer to treat an item and the trailing comma as a single token. And it resulted in a parse error: $ sudo perf record -e cycles:P --filter 'period > 0, ip > 64' -- true perf_bpf_filter: Error: Unexpected item: 0, perf_bpf_filter: syntax error, unexpected BFT_ERROR, expecting BFT_NUM Usage: perf record [] [] or: perf record [] -- [] --filter event filter It should get "0" and "," separately. An easiest fix would be to remove "," from the possible pathname characters. As it's for cgroup names, probably ok to assume it won't have commas in the pathname. I found that the existing BPF filtering test didn't have any complex filter condition with commas. Let's update the group filter test which is supposed to test filter combinations like this. Link: https://lore.kernel.org/r/20250307220922.434319-1-namhyung@kernel.org Fixes: 91e88437d5156b20 ("perf bpf-filter: Support filtering on cgroups") Reported-by: Sally Shi Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf pmu: Handle memory failure in tool_pmu__new()

2025-04-10T12:44:34+00:00

[ Upstream commit 431db90a7303cb394c5a881b4479946f64052727 ] On linux-next commit 72c6f57a4193 ("perf pmu: Dynamically allocate tool PMU") allocated PMU named "tool" dynamicly. However that allocation can fail and a NULL pointer is returned. That case is currently not handled and would result in an invalid address reference. Add a check for NULL pointer. Fixes: 72c6f57a4193 ("perf pmu: Dynamically allocate tool PMU") Signed-off-by: Thomas Richter Reviewed-by: James Clark Link: https://lore.kernel.org/r/20250319122820.2898333-1-tmricht@linux.ibm.com Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf: intel-tpebs: Fix incorrect usage of zfree()

2025-04-10T12:44:34+00:00

[ Upstream commit 6d2dcd635204c023eb5328ad7d38b198a5558c9b ] zfree() requires an address otherwise it frees what's in name, rather than name itself. Pass the address of name to fix it. This was the only incorrect occurrence in Perf found using a search. Fixes: 8db5cabcf1b6 ("perf stat: Fork and launch 'perf record' when 'perf stat' needs to get retire latency value for a metric.") Signed-off-by: James Clark Link: https://lore.kernel.org/r/20250319101614.190922-1-james.clark@linaro.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf dso: fix dso__is_kallsyms() check

2025-04-10T12:44:33+00:00

[ Upstream commit ebf0b332732dcc64239119e554faa946562b0b93 ] Kernel modules for which we cannot find a file on-disk will have a dso->long_name that looks like "[module_name]". Prior to the commit listed in the fixes, the dso->kernel field would be zero (for user space), so dso__is_kallsyms() would return false. After the commit, kernel module DSOs are correctly labeled, but the result is that dso__is_kallsyms() erroneously returns true for those modules without a filesystem path. Later, build_id_cache__add() consults this value of is_kallsyms, and when true, it copies /proc/kallsyms into the cache. Users with many kernel modules without a filesystem path (e.g. ksplice or possibly kernel live patch modules) have reported excessive disk space usage in the build ID cache directory due to this behavior. To reproduce the issue, it's enough to build a trivial out-of-tree hello world kernel module, load it using insmod, and then use: perf record -ag -- sleep 1 In the build ID directory, there will be a directory for your module name containing a kallsyms file. Fix this up by changing dso__is_kallsyms() to consult the dso_binary_type enumeration, which is also symmetric to the above checks for dso__is_vmlinux() and dso__is_kcore(). With this change, kallsyms is not cached in the build-id cache for out-of-tree modules. Fixes: 02213cec64bbe ("perf maps: Mark module DSOs with kernel type") Signed-off-by: Stephen Brennan Link: https://lore.kernel.org/r/20250318230012.2038790-1-stephen.s.brennan@oracle.com Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Check if there is space to copy all the event

2025-04-10T12:44:33+00:00

[ Upstream commit 89aaeaf84231157288035b366cb6300c1c6cac64 ] The pyrf_event__new() method copies the event obtained from the perf ring buffer to a structure that will then be turned into a python object for further consumption, so it copies perf_event.header.size bytes to its 'event' member: $ pahole -C pyrf_event /tmp/build/perf-tools-next/python/perf.cpython-312-x86_64-linux-gnu.so struct pyrf_event { PyObject ob_base; /* 0 16 */ struct evsel * evsel; /* 16 8 */ struct perf_sample sample; /* 24 312 */ /* XXX last struct has 7 bytes of padding, 2 holes */ /* --- cacheline 5 boundary (320 bytes) was 16 bytes ago --- */ union perf_event event; /* 336 4168 */ /* size: 4504, cachelines: 71, members: 4 */ /* member types with holes: 1, total: 2 */ /* paddings: 1, sum paddings: 7 */ /* last cacheline: 24 bytes */ }; $ It was doing so without checking if the event just obtained has more than that space, fix it. This isn't a proper, final solution, as we need to support larger events, but for the time being we at least bounds check and document it. Fixes: 877108e42b1b9ba6 ("perf tools: Initial python binding") Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250312203141.285263-7-acme@kernel.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Don't keep a raw_data pointer to consumed ring buffer space

2025-04-10T12:44:33+00:00

[ Upstream commit f3fed3ae34d606819d87a63d970cc3092a5be7ab ] When processing tracepoints the perf python binding was parsing the event before calling perf_mmap__consume(&md->core) in pyrf_evlist__read_on_cpu(). But part of this event parsing was to set the perf_sample->raw_data pointer to the payload of the event, which then could be overwritten by other event before tracepoint fields were asked for via event.prev_comm in a python program, for instance. This also happened with other fields, but strings were were problems were surfacing, as there is UTF-8 validation for the potentially garbled data. This ended up showing up as (with some added debugging messages): ( field 'prev_comm' ret=0x7f7c31f65110, raw_size=68 ) ( field 'prev_pid' ret=0x7f7c23b1bed0, raw_size=68 ) ( field 'prev_prio' ret=0x7f7c239c0030, raw_size=68 ) ( field 'prev_state' ret=0x7f7c239c0250, raw_size=68 ) time 14771421785867 prev_comm= prev_pid=1919907691 prev_prio=796026219 prev_state=0x303a32313175 ==> ( XXX '��' len=16, raw_size=68) ( field 'next_comm' ret=(nil), raw_size=68 ) Traceback (most recent call last): File "/home/acme/git/perf-tools-next/tools/perf/python/tracepoint.py", line 51, in main() File "/home/acme/git/perf-tools-next/tools/perf/python/tracepoint.py", line 46, in main event.next_comm, ^^^^^^^^^^^^^^^ AttributeError: 'perf.sample_event' object has no attribute 'next_comm' When event.next_comm was asked for, the PyUnicode_FromString() python API would fail and that tracepoint field wouldn't be available, stopping the tools/perf/python/tracepoint.py test tool. But, since we already do a copy of the whole event in pyrf_event__new, just use it and while at it remove what was done in in e8968e654191390a ("perf python: Fix pyrf_evlist__read_on_cpu event consuming") because we don't really need to wait for parsing the sample before declaring the event as consumed. This copy is questionable as is now, as it limits the maximum event + sample_type and tracepoint payload to sizeof(union perf_event), this all has been "working" because 'struct perf_event_mmap2', the largest entry in 'union perf_event' is: $ pahole -C perf_event ~/bin/perf | grep mmap2 struct perf_record_mmap2 mmap2; /* 0 4168 */ $ Fixes: bae57e3825a3dded ("perf python: Add support to resolve tracepoint fields") Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250312203141.285263-6-acme@kernel.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Decrement the refcount of just created event on failure

2025-04-10T12:44:33+00:00

[ Upstream commit 3de5a2bf5b4847f7a59a184568f969f8fe05d57f ] To avoid a leak if we have the python object but then something happens and we need to return the operation, decrement the offset of the newly created object. Fixes: 377f698db12150a1 ("perf python: Add struct evsel into struct pyrf_event") Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250312203141.285263-5-acme@kernel.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin

perf python: Fixup description of sample.id event member

2025-04-10T12:44:33+00:00

[ Upstream commit 1376c195e8ad327bb9f2d32e0acc5ac39e7cb30a ] Some old cut'n'paste error, its "ip", so the description should be "event ip", not "event type". Fixes: 877108e42b1b9ba6 ("perf tools: Initial python binding") Signed-off-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Link: https://lore.kernel.org/r/20250312203141.285263-2-acme@kernel.org Signed-off-by: Namhyung Kim Signed-off-by: Sasha Levin