On Fri, Mar 20, 2026 at 12:27 PM Ian Rogers <irogers@google.com> wrote:
>
> Nearly all perf code ends up passing an evsel with the perf_sample,
> which is problematic if you want to rewrite the evsel such as with
> off-CPU processing - all uses of the evsel need fixing up. Previously
> I'd mailed this patch as an RFC with everything combined:
> https://lore.kernel.org/lkml/20260126071822.447368-1-irogers@google.com/
> and there was a request to break it up.
>
> I've started the series by adding documentation to struct
> perf_sample. Next I fixed missing perf_sample__init/exit largely from
> the recent perf inject callchain rewriting work. The 3rd patch adds
> the evsel to struct perf_sample and ensures it is correctly
> initialized. The next 22 patches avoid passing the evsel along with
> sample for different parts of the perf tool, along with some minor
> tweaks like constification and not determining the evsel if it is
> present in the sample.
>
> v4: Fix more sashiko issues: bounds checks, memory safety, making
> refactors better, inconsistent evsels, mmap2 buildid injection
> choice of evsel, mismatched function arguments.
> https://sashiko.dev/#/patchset/20260320080835.724836-1-irogers%40google.com
>
> v3: Fix various sashiko review comments particularly about unintended
> behavior changes.
> https://lore.kernel.org/lkml/20260320080835.724836-1-irogers@google.com/
>
> v2: Add review feedback on the first 2 patches from Namhyung, fix a
> missed evsel assignment running event2evsel in builtin-inject.
> https://lore.kernel.org/lkml/20260319232334.287517-1-irogers@google.com/
>
> v1: https://lore.kernel.org/lkml/20260209174032.4142096-1-irogers@google.com/
>
> Ian Rogers (25):
> perf sample: Document struct perf_sample
> perf sample: Make sure perf_sample__init/exit are used
> perf sample: Add evsel to struct perf_sample
> perf tool: Remove evsel from tool APIs that pass the sample
> perf kvm: Don't pass evsel with sample
> perf evsel: Refactor evsel__intval to perf_sample__intval
> perf trace: Don't pass evsel with sample
> perf callchain: Don't pass evsel and sample
> perf lock: Only pass sample to handlers
> perf lock: Constify trace_lock_handler variables
> perf hist: Remove evsel parameter from inc samples functions
> perf db-export: Remove evsel from struct export_sample
> perf hist: Remove evsel from struct hist_entry_iter
> perf report: Directly use sample->evsel to avoid computing from
> sample->id
> perf annotate: Don't pass evsel to add_sample
> perf inject: Don't pass evsel with sample
> perf kmem: Don't pass evsel with sample
> perf kwork: Don't pass evsel with sample
> perf sched: Don't pass evsel with sample
> perf timechart: Don't pass evsel with sample
> perf trace: Don't pass evsel with sample
> perf evlist: Try to avoid computing evsel from sample
> perf script: Don't pass evsel with sample
> perf s390-sample-raw: Don't pass evsel or its PMU with sample
> perf evsel: Don't pass evsel with sample
Ping.
Thanks,
Ian
> tools/perf/builtin-annotate.c | 28 ++-
> tools/perf/builtin-c2c.c | 6 +-
> tools/perf/builtin-diff.c | 5 +-
> tools/perf/builtin-inject.c | 87 ++++----
> tools/perf/builtin-kmem.c | 85 ++++----
> tools/perf/builtin-kvm.c | 22 +-
> tools/perf/builtin-kwork.c | 104 ++++------
> tools/perf/builtin-lock.c | 117 +++++------
> tools/perf/builtin-mem.c | 1 -
> tools/perf/builtin-record.c | 3 +-
> tools/perf/builtin-report.c | 38 ++--
> tools/perf/builtin-sched.c | 188 ++++++++----------
> tools/perf/builtin-script.c | 26 ++-
> tools/perf/builtin-timechart.c | 145 +++++++-------
> tools/perf/builtin-top.c | 19 +-
> tools/perf/builtin-trace.c | 120 +++++------
> tools/perf/tests/hists_cumulate.c | 3 +-
> tools/perf/tests/hists_filter.c | 2 +-
> tools/perf/tests/hists_output.c | 3 +-
> tools/perf/tests/mmap-basic.c | 4 +-
> tools/perf/tests/openat-syscall-tp-fields.c | 2 +-
> tools/perf/tests/perf-record.c | 1 +
> tools/perf/tests/switch-tracking.c | 11 +-
> tools/perf/util/annotate.c | 19 +-
> tools/perf/util/annotate.h | 6 +-
> tools/perf/util/build-id.c | 3 +-
> tools/perf/util/build-id.h | 7 +-
> tools/perf/util/callchain.c | 18 +-
> tools/perf/util/callchain.h | 5 +-
> tools/perf/util/data-convert-bt.c | 2 +-
> tools/perf/util/data-convert-json.c | 5 +-
> tools/perf/util/db-export.c | 13 +-
> tools/perf/util/db-export.h | 3 +-
> tools/perf/util/evlist.c | 5 +-
> tools/perf/util/evsel.c | 101 +++++++---
> tools/perf/util/evsel.h | 12 +-
> tools/perf/util/hist.c | 26 +--
> tools/perf/util/hist.h | 3 +-
> tools/perf/util/intel-pt.c | 2 +-
> tools/perf/util/intel-tpebs.c | 3 +-
> tools/perf/util/jitdump.c | 2 +-
> .../perf/util/kvm-stat-arch/kvm-stat-arm64.c | 19 +-
> .../util/kvm-stat-arch/kvm-stat-loongarch.c | 17 +-
> .../util/kvm-stat-arch/kvm-stat-powerpc.c | 17 +-
> .../perf/util/kvm-stat-arch/kvm-stat-riscv.c | 17 +-
> tools/perf/util/kvm-stat-arch/kvm-stat-s390.c | 20 +-
> tools/perf/util/kvm-stat-arch/kvm-stat-x86.c | 70 +++----
> tools/perf/util/kvm-stat.c | 19 +-
> tools/perf/util/kvm-stat.h | 18 +-
> tools/perf/util/kwork.h | 9 +-
> tools/perf/util/machine.c | 14 +-
> tools/perf/util/machine.h | 3 -
> tools/perf/util/powerpc-vpadtl.c | 10 +-
> tools/perf/util/s390-sample-raw.c | 31 +--
> tools/perf/util/sample.c | 11 +-
> tools/perf/util/sample.h | 119 ++++++++++-
> .../util/scripting-engines/trace-event-perl.c | 23 +--
> .../scripting-engines/trace-event-python.c | 47 ++---
> tools/perf/util/session.c | 74 ++++---
> tools/perf/util/synthetic-events.c | 45 +++--
> tools/perf/util/synthetic-events.h | 2 -
> tools/perf/util/tool.c | 4 +-
> tools/perf/util/tool.h | 4 +-
> tools/perf/util/trace-event-scripting.c | 5 +-
> tools/perf/util/trace-event.h | 3 -
> 65 files changed, 973 insertions(+), 883 deletions(-)
>
> --
> 2.53.0.959.g497ff81fa9-goog
>