kernel/linux.git/tools/perf/util/evsel.c, branch linux-7.1.y

perf sample: Add evsel to struct perf_sample

2026-04-06T06:12:15+00:00

Add the evsel from evsel__parse_sample into the struct perf_sample. Sometimes we want to alter the evsel associated with a sample, such as with off-cpu bpf-output events. In general the evsel and perf_sample are passed as a pair, but this makes an altered evsel something of a chore to keep checking for and setting up. Later patches will remove passing an evsel with the perf_sample and switch to just using the perf_sample's value. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf sample: Make sure perf_sample__init/exit are used

2026-04-06T06:12:15+00:00

The deferred stack trace code wasn't using perf_sample__init/exit. Add the deferred stack trace clean up to perf_sample__exit which requires proper NULL initialization in perf_sample__init. Make the perf_sample__exit robust to being called more than once by using zfree. Make the error paths in evsel__parse_sample exit the sample. Add a merged_callchain boolean to capture that callchain is allocated, deferred_callchain doen't suffice for this. Pack the struct variables to avoid padding bytes for this. Similiarly powerpc_vpadtl_sample wasn't using perf_sample__init/exit, use it for consistency and potential issues with uninitialized variables. Similarly guest_session__inject_events in builtin-inject wasn't using perf_sample_init/exit. The lifetime management for fetched events is somewhat complex there, but when an event is fetched the sample should be initialized and needs exiting on error. The sample may be left in place so that future injects have access to it. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf evsel: Make unknown event names more unique

2026-04-03T02:35:17+00:00

In situations like the perf data converter the evsel__name will be used to create babeltrace events. If the events have the same name then creation can fail. Avoid these failures by including more information into the unknown event names. Signed-off-by: Ian Rogers Signed-off-by: Namhyung Kim

perf evlist: Improve default event for s390

2026-03-19T21:42:46+00:00

Frame pointer callchains are not supported on s390 and dwarf callchains are only supported on software events. Switch the default event from the hardware 'cycles' event to the software 'cpu-clock' or 'task-clock' on s390 if callchains are enabled. Move some of the target initialization earlier in builtin-top and builtin-record, so it is ready for use by evlist__new_default. If frame pointer callchains are requested on s390 show a warning. Modify the '-g' option of `perf top` and `perf record` to default to dwarf callchains on s390. Signed-off-by: Ian Rogers Tested-by: Thomas Richter Signed-off-by: Namhyung Kim

perf evsel: Constify option arguments to config functions

2026-03-19T21:42:46+00:00

The options are used to configure the evsel but are not themselves configured. Make the arguments const to better capture this. Signed-off-by: Ian Rogers Tested-by: Thomas Richter Signed-off-by: Namhyung Kim

perf evsel: Improve falling back from cycles

2026-03-19T21:42:45+00:00

Switch to using evsel__match rather than comparing perf_event_attr values, this is robust on hybrid architectures. Ensure evsel->pmu matches the evsel->core.attr. Remove exclude bits that get set in other fallback attempts when switching the event. Log the event name with modifiers when switching the event on fallback. Signed-off-by: Ian Rogers Tested-by: Thomas Richter Signed-off-by: Namhyung Kim

perf regs: Remove weak attributive archxxx_reg_mask() functions

2026-02-06T15:16:09+00:00

Currently, some architecture-specific perf-regs functions, such as arch__intr_reg_mask() and arch__user_reg_mask(), are defined with the __weak attribute. This approach ensures that only functions matching the architecture of the build/run host are compiled and executed, reducing build time and binary size. However, this __weak attribute restricts these functions to be called only on the same architecture, preventing cross-architecture functionality. For example, a perf.data file captured on x86 cannot be parsed on an ARM platform. To address this limitation, this patch removes the __weak attribute from these perf-regs functions. The architecture-specific code is moved from the arch/ directory to the util/perf-regs-arch/ directory. The appropriate architectural functions are then called based on the EM_HOST. No functional changes are intended. Suggested-by: Ian Rogers Reviewed-by: Ian Rogers Signed-off-by: Dapeng Mi Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Guo Ren Cc: Ingo Molnar Cc: James Clark Cc: John Garry Cc: Mike Leach Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Thomas Falcon Cc: Will Deacon Cc: Xudong Hao Cc: Zide Chen [ Fixed up somme fuzz with s390 and riscv Build files wrt removing perf_regs.o ] Signed-off-by: Arnaldo Carvalho de Melo

perf session: Add e_flags to the e_machine helper

2026-02-03T21:01:27+00:00

Allow e_flags as well as e_machine to be computed using the e_machine helper. This isn't currently used, the argument is always NULL, but it will be used for a new header feature. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Andrew Jones Cc: Anubhav Shelat Cc: Anup Patel Cc: Athira Rajeev Cc: Blake Jones Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Quan Zhou Cc: Shimin Guo Cc: Swapnil Sapkal Cc: Thomas Falcon Cc: Will Deacon Cc: Yunseong Kim Signed-off-by: Arnaldo Carvalho de Melo

perf kvm: Wire up e_machine

2026-02-03T21:01:27+00:00

Pass the e_machine to the kvm functions so that they aren't just wired to EM_HOST. In the case of a session move some setup until the session is created. As the session isn't fully running the default EM_HOST is returned as no e_machine can be found in a running machine. This is, however, some marginal progress to cross platform support. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Andrew Jones Cc: Anubhav Shelat Cc: Anup Patel Cc: Athira Rajeev Cc: Blake Jones Cc: Chun-Tse Shao Cc: Dapeng Mi Cc: Dmitriy Vyukov Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Quan Zhou Cc: Shimin Guo Cc: Swapnil Sapkal Cc: Thomas Falcon Cc: Will Deacon Cc: Yunseong Kim Signed-off-by: Arnaldo Carvalho de Melo

perf perf_regs: Switch from arch string to int e_machine

2026-01-20T18:43:04+00:00

The arch string requires multiple strcmp to identify things like the IP and SP. Switch to passing in an e_machine that in the bulk of cases is computed using a current thread load. The e_machine also allows identification of 32-bit vs 64-bit processes. Signed-off-by: Ian Rogers Cc: Aditya Bodkhe Cc: Adrian Hunter Cc: Albert Ou Cc: Alexandre Ghiti Cc: Andi Kleen Cc: Athira Rajeev Cc: Chun-Tse Shao Cc: Dmitriy Vyukov Cc: Dr. David Alan Gilbert Cc: Guo Ren Cc: Haibo Xu Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Krzysztof Łopatowski Cc: Leo Yan Cc: Mark Wielaard Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Sergei Trofimovich Cc: Shimin Guo Cc: Stephen Brennan Cc: Thomas Falcon Cc: Will Deacon [ Include dwarf-regs.h to get conditional defines for EM_CSKY and EM_LOONGARCH, not available in old distros ] Signed-off-by: Arnaldo Carvalho de Melo

kernel/linux.git/tools/perf/util/evsel.c, branch linux-7.1.y

perf sample: Add evsel to struct perf_sample

perf sample: Make sure perf_sample__init/exit are used

perf evsel: Make unknown event names more unique

perf evlist: Improve default event for s390

perf evsel: Constify option arguments to config functions

perf evsel: Improve falling back from cycles

perf regs: Remove __weak attributive arch__xxx_reg_mask() functions

perf session: Add e_flags to the e_machine helper

perf kvm: Wire up e_machine

perf perf_regs: Switch from arch string to int e_machine

perf regs: Remove weak attributive archxxx_reg_mask() functions