user/sven/linux.git/tools/perf, branch v6.6.32

perf lock contention: Add a missing NULL check

2024-04-27T15:11:34Z

[ Upstream commit f3408580bac8ce5cd76e7391e529c0a22e7c7eb2 ] I got a report for a failure in BPF verifier on a recent kernel with perf lock contention command. It checks task->sighand->siglock without checking if sighand is NULL or not. Let's add one. ; if (&curr->sighand->siglock == (void *)lock) 265: (79) r1 = *(u64 *)(r0 +2624) ; frame1: R0_w=trusted_ptr_task_struct(off=0,imm=0) ; R1_w=rcu_ptr_or_null_sighand_struct(off=0,imm=0) 266: (b7) r2 = 0 ; frame1: R2_w=0 267: (0f) r1 += r2 R1 pointer arithmetic on rcu_ptr_or_null_ prohibited, null-check it first processed 164 insns (limit 1000000) max_states_per_insn 1 total_states 15 peak_states 15 mark_read 5 -- END PROG LOAD LOG -- libbpf: prog 'contention_end': failed to load: -13 libbpf: failed to load object 'lock_contention_bpf' libbpf: failed to load BPF skeleton 'lock_contention_bpf': -13 Failed to load lock-contention BPF skeleton lock contention BPF setup failed lock contention did not detect any lock contention Fixes: 1811e82767dcc ("perf lock contention: Track and show siglock with address") Reviewed-by: Ian Rogers Acked-by: Arnaldo Carvalho de Melo Cc: Song Liu Cc: bpf@vger.kernel.org Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240409225542.1870999-1-namhyung@kernel.org Signed-off-by: Sasha Levin

perf top: Use evsel's cpus to replace user_requested_cpus

2024-04-03T13:28:53Z

commit 5fa695e7da4975e8d21ce49f3718d6cf00ecb75e upstream. perf top errors out on a hybrid machine $perf top Error: The cycles:P event is not supported. The perf top expects that the "cycles" is collected on all CPUs in the system. But for hybrid there is no single "cycles" event which can cover all CPUs. Perf has to split it into two cycles events, e.g., cpu_core/cycles/ and cpu_atom/cycles/. Each event has its own CPU mask. If a event is opened on the unsupported CPU. The open fails. That's the reason of the above error out. Perf should only open the cycles event on the corresponding CPU. The commit ef91871c960e ("perf evlist: Propagate user CPU maps intersecting core PMU maps") intersect the requested CPU map with the CPU map of the PMU. Use the evsel's cpus to replace user_requested_cpus. The evlist's threads are also propagated to the evsel's threads in __perf_evlist__propagate_maps(). For a system-wide event, perf appends a dummy event and assign it to the evsel's threads. For a per-thread event, the evlist's thread_map is assigned to the evsel's threads. The same as the other tools, e.g., perf record, using the evsel's threads when opening an event. Reported-by: Arnaldo Carvalho de Melo Reviewed-by: Ian Rogers Signed-off-by: Kan Liang Tested-by: Arnaldo Carvalho de Melo Cc: Hector Martin Cc: Marc Zyngier Cc: Mark Rutland Cc: Namhyung Kim Closes: https://lore.kernel.org/linux-perf-users/ZXNnDrGKXbEELMXV@kernel.org/ Link: https://lore.kernel.org/r/20231214144612.1092028-1-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Greg Kroah-Hartman

perf pmu: Fix a potential memory leak in perf_pmu__lookup()

2024-03-26T22:19:52Z

[ Upstream commit ef5de1613d7d92bdc975e6beb34bb0fa94f34078 ] The commit in Fixes has reordered some code, but missed an error handling path. 'goto err' now, in order to avoid a memory leak in case of error. Fixes: f63a536f03a2 ("perf pmu: Merge JSON events with sysfs at load time") Signed-off-by: Christophe JAILLET Reviewed-by: Ian Rogers Cc: kernel-janitors@vger.kernel.org Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/9538b2b634894c33168dfe9d848d4df31fd4d801.1693085544.git.christophe.jaillet@wanadoo.fr Signed-off-by: Sasha Levin

perf print-events: make is_event_supported() more robust

2024-03-26T22:19:51Z

[ Upstream commit 25412c0364f7110faa6053c73e3fd47ca956b8c3 ] Currently the perf tool doesn't detect support for extended event types on Apple M1/M2 systems, and will not auto-expand plain PERF_EVENT_TYPE hardware events into per-PMU events. This is due to the detection of extended event types not handling mandatory filters required by the M1/M2 PMU driver. PMU drivers and the core perf_events code can require that perf_event_attr::exclude_* filters are configured in a specific way and may reject certain configurations of filters, for example: (a) Many PMUs lack support for any event filtering, and require all perf_event_attr::exclude_* bits to be clear. This includes Alpha's CPU PMU, and ARM CPU PMUs prior to the introduction of PMUv2 in ARMv7, (b) When /proc/sys/kernel/perf_event_paranoid >= 2, the perf core requires that perf_event_attr::exclude_kernel is set. (c) The Apple M1/M2 PMU requires that perf_event_attr::exclude_guest is set as the hardware PMU does not count while a guest is running (but might be extended in future to do so). In is_event_supported(), we try to account for cases (a) and (b), first attempting to open an event without any filters, and if this fails, retrying with perf_event_attr::exclude_kernel set. We do not account for case (c), or any other filters that drivers could theoretically require to be set. Thus is_event_supported() will fail to detect support for any events targeting an Apple M1/M2 PMU, even where events would be supported with perf_event_attr:::exclude_guest set. Since commit: 82fe2e45cdb00de4 ("perf pmus: Check if we can encode the PMU number in perf_event_attr.type") ... we use is_event_supported() to detect support for extended types, with the PMU ID encoded into the perf_event_attr::type. As above, on an Apple M1/M2 system this will always fail to detect that the event is supported, and consequently we fail to detect support for extended types even when these are supported, as they have been since commit: 5c816728651ae425 ("arm_pmu: Add PERF_PMU_CAP_EXTENDED_HW_TYPE capability") Due to this, the perf tool will not automatically expand plain PERF_TYPE_HARDWARE events into per-PMU events, even when all the necessary kernel support is present. This patch updates is_event_supported() to additionally try opening events with perf_event_attr::exclude_guest set, allowing support for events to be detected on Apple M1/M2 systems. I believe that this is sufficient for all contemporary CPU PMU drivers, though in future it may be necessary to check for other combinations of filter bits. I've deliberately changed the check to not expect a specific error code for missing filters, as today ;the kernel may return a number of different error codes for missing filters (e.g. -EACCESS, -EINVAL, or -EOPNOTSUPP) depending on why and where the filter configuration is rejected, and retrying for any error is more robust. Note that this does not remove the need for commit: a24d9d9dc096fc0d ("perf parse-events: Make legacy events lower priority than sysfs/JSON") ... which is still necessary so that named-pmu/event/ events work on kernels without extended type support, even if the event name happens to be the same as a PERF_EVENT_TYPE_HARDWARE event (e.g. as is the case for the M1/M2 PMU's 'cycles' and 'instructions' events). Fixes: 82fe2e45cdb00de4 ("perf pmus: Check if we can encode the PMU number in perf_event_attr.type") Signed-off-by: Mark Rutland Tested-by: Ian Rogers Tested-by: James Clark Tested-by: Marc Zyngier Cc: Hector Martin Cc: James Clark Cc: John Garry Cc: Leo Yan Cc: Mike Leach Cc: Suzuki K Poulose Cc: Thomas Richter Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240126145605.1005472-1-mark.rutland@arm.com Signed-off-by: Sasha Levin

perf metric: Don't remove scale from counts

2024-03-26T22:19:48Z

[ Upstream commit 6d6be5eb45b423a37d746d3ee0fd0c78f76ead9f ] Counts were switched from the scaled saved value form to the aggregated count to avoid double accounting. When this happened the removing of scaling for a count should have been removed, however, it wasn't and this wasn't observed as it normally doesn't matter because a counter's scale is 1. A problem was observed with RAPL events that are scaled. Fixes: 37cc8ad77cf8 ("perf metric: Directly use counts rather than saved_value") Signed-off-by: Ian Rogers Reviewed-by: Kan Liang Cc: K Prateek Nayak Cc: James Clark Cc: Kaige Ye Cc: John Garry Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240209204947.3873294-5-irogers@google.com Signed-off-by: Sasha Levin

perf stat: Avoid metric-only segv

2024-03-26T22:19:48Z

[ Upstream commit 2543947c77e0e224bda86b4e7220c2f6714da463 ] Cycles is recognized as part of a hard coded metric in stat-shadow.c, it may call print_metric_only with a NULL fmt string leading to a segfault. Handle the NULL fmt explicitly. Fixes: 088519f318be ("perf stat: Move the display functions to stat-display.c") Signed-off-by: Ian Rogers Reviewed-by: Kan Liang Cc: K Prateek Nayak Cc: James Clark Cc: Kaige Ye Cc: John Garry Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240209204947.3873294-4-irogers@google.com Signed-off-by: Sasha Levin

perf expr: Fix "has_event" function for metric style events

2024-03-26T22:19:48Z

[ Upstream commit 6dd76680b925228312756c13b9b983661b552a64 ] Events in metrics cannot use '/' as a separator, it would be recognized as a divide, so they use '@'. The '@' is recognized in the metricgroups code and changed to '/', do the same in the has_event function so that the parsing is only tried without the @s. Fixes: 4a4a9bf9075f ("perf expr: Add has_event function") Signed-off-by: Ian Rogers Reviewed-by: Kan Liang Cc: K Prateek Nayak Cc: James Clark Cc: Kaige Ye Cc: John Garry Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240209204947.3873294-3-irogers@google.com Signed-off-by: Sasha Levin

perf srcline: Add missed addr2line closes

2024-03-26T22:19:47Z

[ Upstream commit c7ba9d18ae47924a6ea6a47ca139779f58eb83c0 ] The child_process for addr2line sets in and out to -1 so that pipes get created. It is the caller's responsibility to close the pipes, finish_command doesn't do it. Add the missed closes. Fixes: b3801e791231 ("perf srcline: Simplify addr2line subprocess") Signed-off-by: Ian Rogers Cc: Ravi Bangoria Cc: James Clark Cc: Nick Desaulniers Cc: Nathan Chancellor Cc: Kan Liang Cc: John Garry Cc: Tom Rix Cc: llvm@lists.linux.dev Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240201001504.1348511-8-irogers@google.com Signed-off-by: Sasha Levin

perf thread_map: Free strlist on normal path in thread_map__new_by_tid_str()

2024-03-26T22:19:46Z

[ Upstream commit 1eb3d924e3c0b8c27388b0583a989d757866efb6 ] slist needs to be freed in both error path and normal path in thread_map__new_by_tid_str(). Fixes: b52956c961be3a04 ("perf tools: Allow multiple threads or processes in record, stat, top") Reviewed-by: Arnaldo Carvalho de Melo Signed-off-by: Yang Jihong Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/20240206083228.172607-6-yangjihong1@huawei.com Signed-off-by: Sasha Levin

perf bpf: Clean up the generated/copied vmlinux.h

2024-03-26T22:19:45Z

[ Upstream commit ffd856537b95dd65facb4e0c78ca1cb92c2048ff ] When building perf with BPF skels we either copy the minimalistic tools/perf/util/bpf_skel/vmlinux/vmlinux.h or use bpftool to generate a vmlinux from BTF, storing the result in $(SKEL_OUT)/vmlinux.h. We need to remove that when doing a 'make -C tools/perf clean', fix it. Fixes: b7a2d774c9c5a9a3 ("perf build: Add ability to build with a generated vmlinux.h") Reviewed-by: Ian Rogers Cc: Andrii Nakryiko Cc: James Clark Cc: Tiezhu Yang Cc: Yang Jihong Cc: bpf@vger.kernel.org Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim Link: https://lore.kernel.org/r/Zbz89KK5wHfZ82jv@x1 Signed-off-by: Sasha Levin