[PATCHES 0/2] perf tools: Add cached probe type detection for evsel

[Arnaldo Carvalho de Melo <acme@kernel.org>]

Hi,

Checking whether an evsel is a kprobe or uprobe currently requires
walking the PMU list via evsel__find_pmu() on every call.  This is
wasteful when the same evsel is checked repeatedly in hot paths like
trace__fprintf_tp_fields().

Patch 1 adds evsel__is_kprobe(), evsel__is_uprobe(), and
evsel__is_probe() helpers that resolve the probe type on first call
and cache the result in a 2-bit field that fits in existing struct
padding.

Patch 2 is the first user: it guards the __probe_ip field name
comparison in perf trace with evsel__is_probe(), so the strcmp is
skipped entirely for the common case of non-probe tracepoint events.

Build-tested with gcc and clang.

Arnaldo Carvalho de Melo (2):
  perf evsel: Add lazy-initialized probe type detection helpers
  perf trace: Guard __probe_ip suppression with evsel__is_probe()

 tools/perf/builtin-trace.c |  2 +-
 tools/perf/util/evsel.c    | 44 ++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/evsel.h    |  5 +++++
 3 files changed, 50 insertions(+), 1 deletion(-)

Developed with AI assistance (Claude), tagged in commits.

Thanks,

- Arnaldo