linux-kernel - [PATCH 0/4] perf arm-spe: Improve --itrace options

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Message-Id: <20250908-james-perf-spe-period-v1-0-7ccd805af461@linaro.org>
Date: Mon, 08 Sep 2025 13:10:17 +0100
From: James Clark <james.clark@...aro.org>
To: John Garry <john.g.garry@...cle.com>, Will Deacon <will@...nel.org>, 
 Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Namhyung Kim <namhyung@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>, 
 Adrian Hunter <adrian.hunter@...el.com>, George Wort <George.Wort@....com>, 
 Graham Woodward <Graham.Woodward@....com>, Ben Gainey <Ben.Gainey@....com>, 
 Michael Williams <Michael.Williams@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, James Clark <james.clark@...aro.org>
Subject: [PATCH 0/4] perf arm-spe: Improve --itrace options

Most people also want all the SPE samples (instructions group), not just
the flagged samples that are put into the various memory groups. These
should have been shown by default but weren't because the default
interval type wasn't supported.

Also when looking at this, it appears that the downsampling was behaving
in a way that would discard samples from one group but not another.
Improve that and the warning messages.

I don't want to put fixes tags on these because it's only changing the
defaults and the behavior, but I don't think the previous behavior was
incorrect necessarily, just copied from tracing techs but not ideal for
SPE.

Signed-off-by: James Clark <james.clark@...aro.org>
---
James Clark (4):
      perf arm-spe: Show instruction sample types by default
      perf arm-spe: Downsample all sample types equally
      perf arm-spe: Display --itrace period warnings for all sample types
      perf docs: Update SPE doc to include default instructions group

 tools/perf/Documentation/perf-arm-spe.txt | 14 +++++---
 tools/perf/util/arm-spe.c                 | 53 ++++++++++++++++---------------
 2 files changed, 37 insertions(+), 30 deletions(-)
---
base-commit: 75a7b9d29215c5aa813b9620f3c56817918f9f8c
change-id: 20250908-james-perf-spe-period-4711a566cba4

Best regards,
-- 
James Clark <james.clark@...aro.org>