[all-commits] [llvm/llvm-project] 172f6d: [memprof] Add Version2 of the indexed MemProf form...

[Kazu Hirata via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 172f6ddfa7662a36e3a41db6bb944f7d72fd0b00
      https://github.com/llvm/llvm-project/commit/172f6ddfa7662a36e3a41db6bb944f7d72fd0b00
  Author: Kazu Hirata <kazu at google.com>
  Date:   2024-04-18 (Thu, 18 Apr 2024)

  Changed paths:
    M llvm/include/llvm/ProfileData/InstrProfReader.h
    M llvm/include/llvm/ProfileData/InstrProfWriter.h
    M llvm/include/llvm/ProfileData/MemProf.h
    M llvm/include/llvm/ProfileData/MemProfReader.h
    M llvm/lib/ProfileData/InstrProfReader.cpp
    M llvm/lib/ProfileData/InstrProfWriter.cpp
    M llvm/test/tools/llvm-profdata/memprof-merge-v0.test
    M llvm/tools/llvm-profdata/llvm-profdata.cpp
    M llvm/unittests/ProfileData/InstrProfTest.cpp

  Log Message:
  -----------
  [memprof] Add Version2 of the indexed MemProf format (#89100)

This patch adds Version2 of the indexed MemProf format.  The new
format comes with a hash table from CallStackId to actual call stacks
llvm::SmallVector<FrameId>.  The rest of the format refers to call
stacks with CallStackId.  This "values + references" model effectively
deduplicates call stacks.  Without this patch, a large indexed memprof
file of mine shrinks from 4.4GB to 1.6GB, a 64% reduction.

This patch does not make Version2 generally available yet as I am
planning to make a few more changes to the format.



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