Re: [PATCH v1 00/25] perf tool: Add evsel to perf_sample

[Namhyung Kim <namhyung@kernel.org>]

On Mon, Feb 09, 2026 at 09:40:07AM -0800, Ian Rogers 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.

Do you have a patch for off-CPU on top of this change?  I'd like to see
what you expect before applying massive changes.

Thanks,
Namhyung

> 
> 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 with sample
>   perf evsel: Don't pass evsel with sample
> 
>  tools/perf/builtin-annotate.c                 |  28 ++-
>  tools/perf/builtin-c2c.c                      |   6 +-
>  tools/perf/builtin-diff.c                     |   5 +-
>  tools/perf/builtin-inject.c                   |  81 ++++----
>  tools/perf/builtin-kmem.c                     |  58 +++---
>  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                    | 183 ++++++++----------
>  tools/perf/builtin-script.c                   |  26 ++-
>  tools/perf/builtin-timechart.c                |  76 +++-----
>  tools/perf/builtin-top.c                      |  19 +-
>  tools/perf/builtin-trace.c                    | 103 +++++-----
>  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/switch-tracking.c            |   9 +-
>  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                   |   8 +-
>  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/evsel.c                       |  60 +++---
>  tools/perf/util/evsel.h                       |  12 +-
>  tools/perf/util/hist.c                        |  26 +--
>  tools/perf/util/hist.h                        |   3 +-
>  tools/perf/util/intel-pt.c                    |  12 +-
>  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/s390-sample-raw.c             |  15 +-
>  tools/perf/util/sample.c                      |   8 +-
>  tools/perf/util/sample.h                      |  93 ++++++++-
>  .../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            |   9 +-
>  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 -
>  62 files changed, 769 insertions(+), 823 deletions(-)
> 
> -- 
> 2.53.0.239.g8d8fc8a987-goog
>