[PATCH] D104276: [CSSPGO][llvm-profgen] Ignore LBR records after interrup transition

[Hongtao Yu via Phabricator via llvm-commits]

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If we have seen an inwards transition from external code to internal code, but not a following outwards transition, the inwards transition is likely due to interrupt which is usually unpaired. Ignore current  and subsequent entries since they are likely from an unrelated pre-interrupt context.

LBR records from different interrupt context are unrelated and they should not be mixed together. Currenlty the OS does this for task-scheduling interrupt but not for all interrupts.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D104276

Files:
  llvm/test/tools/llvm-profgen/Inputs/cs-interrupt.perfscript
  llvm/test/tools/llvm-profgen/cs-interrupt.test
  llvm/tools/llvm-profgen/PerfReader.cpp

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