linux-kernel - [PATCH v3 0/2] Add arch TSC frequency information

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Date:   Fri, 15 Jul 2022 15:35:19 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     perry.taylor@...el.com, caleb.biggers@...el.com,
        kshipra.bopardikar@...el.com,
        Kan Liang <kan.liang@...ux.intel.com>,
        Zhengjun Xing <zhengjun.xing@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Andi Kleen <ak@...ux.intel.com>,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Cc:     Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: [PATCH v3 0/2] Add arch TSC frequency information

The first patch adds support for deriving from /proc/cpuinfo and adds
tests. The second patch from Kan Liang derives it from CPUID available
on newer Intel processors as discussed here:
https://lore.kernel.org/lkml/20220527040407.4193232-1-irogers@google.com/#t

v2. Adds warnings to make clear if things have changed/broken on future
    Intel platforms. It also adds caching and an Intel specific that a
    value is computed.

Ian Rogers (1):
  perf metrics: Add literal for system TSC frequency

Kan Liang (1):
  perf tsc: Add arch TSC frequency information

 tools/perf/arch/x86/util/cpuid.h  | 34 +++++++++++++++++
 tools/perf/arch/x86/util/header.c | 27 ++++++--------
 tools/perf/arch/x86/util/tsc.c    | 33 ++++++++++++++++
 tools/perf/tests/expr.c           | 15 ++++++++
 tools/perf/util/expr.c            | 62 +++++++++++++++++++++++++++++++
 tools/perf/util/tsc.h             |  1 +
 6 files changed, 156 insertions(+), 16 deletions(-)
 create mode 100644 tools/perf/arch/x86/util/cpuid.h

-- 
2.37.0.170.g444d1eabd0-goog