[PATCH v2 0/2] perf evsel fallback changes

[Ian Rogers]

Discussion with Thomas Richter in:
https://lore.kernel.org/lkml/20260306071002.2526085-1-tmricht@xxxxxxxxxxxxx/
showed that the evsel__fallback wasn't working for s390. These patches
avoid the problematic frame pointer callchain on s390 and fix
evsel__fallback from a range of problems when falling back to a
software event. I simulated failures when developing the patches but
they are untested other than that.

v2: try exclude_callchain_user for s390 rather than fully disabling
    the callchain. Fix a missed clearing of is_pmu_core if the
    software event fallback.

v1: https://lore.kernel.org/lkml/20260312031928.1494864-1-irogers@xxxxxxxxxx/

Ian Rogers (2):
  perf evsel: Improve falling back from cycles
  perf evsel: Don't configure framepointer callchains on s390

 tools/perf/util/evsel.c | 51 ++++++++++++++++++++++++++++++-----------
 tools/perf/util/evsel.h |  2 ++
 2 files changed, 39 insertions(+), 14 deletions(-)

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2.53.0.851.ga537e3e6e9-goog