[PATCH] D148085: [llvm-exegesis] Add subprocess benchmarking mode

[Aiden Grossman via Phabricator via llvm-commits]

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This patch adds in a a new flag (--benchmark-subprocess) that enables
benchmarking within a subprocess. This is necessary for implementing the
plane described in our annotation RFC
(https://discourse.llvm.org/t/rfc-memory-annotations-for-llvm-exegesis/69554)
as we need to have a lot more control over the memory layout of the
execution environment than is possible by doing everything in a single
process.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D148085

Files:
  llvm/test/tools/llvm-exegesis/X86/latency/Inputs/abnormal-exit-code.s
  llvm/test/tools/llvm-exegesis/X86/latency/Inputs/base-snippet.s
  llvm/test/tools/llvm-exegesis/X86/latency/Inputs/snippet-segfault.s
  llvm/test/tools/llvm-exegesis/X86/latency/subprocess-abnormal-exit-code.test
  llvm/test/tools/llvm-exegesis/X86/latency/subprocess-segfault.test
  llvm/test/tools/llvm-exegesis/X86/latency/subprocess.test
  llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp

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