[PATCH] D146301: [llvm-exegesis] Make possible to execute snippets without perf counters

[Pavel Kosov via Phabricator via llvm-commits]

kpdev42 created this revision.
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Performance counters may be unavailable due to various reasons (such as
access restriction via sysctl properties or the CPU model being unknown
to libpfm). On the other hand, for debugging llvm-exegesis itself it is
still useful to be able to run generated code snippets to ensure that
the snippet does not crash at run time.

The --benchmark-phase=execute-with-dummy-counters command line option
makes llvm-exegesis behave just as usual except for using fake event
counts instead of asking the kernel for actual values.

While this is not strictly a "benchmark phase", it is added to the list
because it is yet another level of gradually disabling parts of the
regular benchmarking flow.

~~

Huawei RRI


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146301

Files:
  llvm/tools/llvm-exegesis/lib/BenchmarkResult.h
  llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp
  llvm/tools/llvm-exegesis/lib/LlvmState.cpp
  llvm/tools/llvm-exegesis/lib/LlvmState.h
  llvm/tools/llvm-exegesis/lib/PerfHelper.cpp
  llvm/tools/llvm-exegesis/lib/PerfHelper.h
  llvm/tools/llvm-exegesis/lib/Target.cpp
  llvm/tools/llvm-exegesis/lib/Target.h
  llvm/tools/llvm-exegesis/llvm-exegesis.cpp

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