Re: [PATCH 0/6 v1] perf test attr: Fix the re-enabled test

[Namhyung Kim <namhyung@kernel.org>]

On Tue, Oct 06, 2026 at 05:00:26PM -0700, Namhyung Kim wrote:
> On Tue, Oct 06, 2026 at 06:13:03PM +0200, Arnaldo Carvalho de Melo wrote:
> > From: Arnaldo Carvalho de Melo <acme@redhat.com>
> > 
> > Hello all,
> > 
> > This series fixes the "Perf attribute expectations test" (perf test 82,
> > formerly "Setup struct perf_event_attr").
> > 
> > Patches 1-2 are Michael Petlan's prerequisite fixes that make the shell
> > wrapper propagate attr.py's return value and correct the
> > perf_event_attr size expectation after struct config4 was added.  They
> > are included at the start of the series so that it applies cleanly on
> > the current perf-tools-next (and for the review bots to verify the new
> > patches); the new fixes are patches 3-6.
> > 
> > With the test reporting failures again, several stale expectations
> > surfaced and are addressed here:
> > 
> > - test-record-graph-dwarf still expected PERF_SAMPLE_ADDR and
> >   PERF_SAMPLE_DATA_SRC for --call-graph dwarf.  Those were dropped by
> >   bdd051e249141c79 ("perf record: Split --data-mmap option"), which
> >   decoupled data MMAP recording from the sample address bits.
> > 
> > - The record and stat group tests expected cache-misses and
> >   instructions to be the legacy PERF_TYPE_HARDWARE events, but since
> >   b1c5efbfd92eb84d ("perf parse-events: Remove hard coded legacy
> >   hardware and cache parsing") they resolve to the core PMU sysfs/JSON
> >   events, so request the legacy encodings explicitly with the
> >   legacy-hardware-config term.
> > 
> > - The perf stat default metrics open their events in groups and the
> >   raw encodings of instructions, branch-misses, cpu-cycles and
> >   stalled-cycles-frontend/backend differ between Intel and AMD, so
> >   base-stat now accepts the standalone and group variants and
> >   test-stat-default/detailed-{1,2,3} gained the per-vendor raw
> >   encodings.
> > 
> > - attr.py no longer requires a recorded event to be in a group when
> >   the matching expectation does not declare one, allowing the stat
> >   tests to verify event attributes without encoding the metric
> >   grouping.  Expectations that declare a group are still verified in
> >   both directions.
> > 
> > The test passes with 'perf test -vv attribute' on x86_64.  The AMD
> > encodings come from the amd_pmu_event_map tables in
> > arch/x86/events/amd/core.c.
> 
> On my machine, the current tmp.perf-tools-next which contains these
> changes fails like this.
> 
>   $ tools/perf/perf test -v 82
>   ---- start ----
>   test child forked, pid 931585
>   /home/namhyung/project/linux/tools/perf/tests/shell/attr.sh: line 20: python: command not found
>   ---- end(-1) ----
>    82: Perf attribute expectations test                                                 : FAILED!
>   
>   === Test Summary ===
>   Passed main tests : 0
>   Passed subtests   : 0
>   Skipped tests     : 0
>   Failed tests      : 1
>   List of failed tests:
>      82: Perf attribute expectations test
> 
> The below patch fixes the problem.

Hmm.. even with the fix, it failed like this.

Thanks,
Namhyung


  $ tools/perf/perf test -v 82
  ---- start ----
  ...
  expected mmap=1, got 0
  expected comm=1, got 0
  expected freq=1, got 0
  expected enable_on_exec=1, got 0
  expected task=1, got 0
  expected sample_id_all=1, got 0
  expected branch_sample_type=16, got 0
  FAILED '/home/namhyung/project/linux/tools/perf/tests/shell/attr/test-record-branch-filter-any_call' - match failure
  ---- end(-1) ----
   82: Perf attribute expectations test                                                                      : FAILED!
  
  === Test Summary ===
  Passed main tests : 0
  Passed subtests   : 0
  Skipped tests     : 0
  Failed tests      : 1
  List of failed tests:
     82: Perf attribute expectations test