[PATCH 0/2] perf alpha: Decode ProfileMe samples

[Matt Turner]

The Alpha kernel series "alpha/perf: add ProfileMe sampling" adds
ProfileMe sampling to the Alpha cpu PMU. Each ProfileMe sample carries
the profiled instruction's PMPC and its I_STAT and PCTR_CTL status as
PERF_SAMPLE_RAW data, which says whether the instruction retired,
whether it trapped and why, whether it was a mispredicted branch,
stalled before map, or was killed on a wrong path, and what PCTR1
counted while it was in flight:

  https://lore.kernel.org/r/20261028-alpha-profileme-v1-0-d44b52bf2500@xxxxxxxxx

This series is the perf tool side. Patch 1 decodes the raw data in perf
report -D and perf script -D, as is done for AMD IBS. It copies the new
uapi header from the kernel series into tools/arch, so it should wait
until that header is merged. Patch 2 adds a script that sums the status
by symbol or by instruction, in the style of DCPI.

To try it, with the kernel series applied:

  perf record -R -e instructions:p -- ./workload
  tools/perf/python/alpha-profileme.py --pc

I tested this on an AlphaServer ES47 (EV7). Sampling a loop whose
branch tests random data reports that branch mispredicted in 21% of its
samples, and 0% with sorted data.

Signed-off-by: Matt Turner <mattst88@xxxxxxxxx>
---
Matt Turner (2):
      perf alpha: Decode ProfileMe raw samples
      perf python: Add alpha-profileme.py

 tools/arch/alpha/include/uapi/asm/perf_event.h |  27 +++++
 tools/perf/check-headers.sh                    |   1 +
 tools/perf/python/alpha-profileme.py           | 162 +++++++++++++++++++++++++
 tools/perf/util/Build                          |   1 +
 tools/perf/util/alpha-sample-raw.c             | 133 ++++++++++++++++++++
 tools/perf/util/sample-raw.c                   |   2 +
 tools/perf/util/sample-raw.h                   |   2 +
 7 files changed, 328 insertions(+)
---
base-commit: e74880764bf94b738102b4b6b6e8304d0c8375d3
change-id: 20261028-perf-alpha-profileme-8010299be323

Best regards,
--  
Matt Turner <mattst88@xxxxxxxxx>