[all-commits] [llvm/llvm-project] 35a003: [MemProf][NFC] Clear each IndexedMemProfRecord aft...

[Teresa Johnson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 35a003c2b21082f3c47c8b01d9d1955af5ab098e
      https://github.com/llvm/llvm-project/commit/35a003c2b21082f3c47c8b01d9d1955af5ab098e
  Author: Teresa Johnson <tejohnson at google.com>
  Date:   2023-12-15 (Fri, 15 Dec 2023)

  Changed paths:
    M llvm/include/llvm/ProfileData/MemProf.h
    M llvm/lib/ProfileData/InstrProfWriter.cpp

  Log Message:
  -----------
  [MemProf][NFC] Clear each IndexedMemProfRecord after it is written (#75205)

The on-disk hash table for the memprof writer holds copies of all the
memprof records to be written. These hold a lot of memory in aggregate,
due to the lists of alloc sites (which each have a list of context
frames) and call sites. Clear each one after emitting it.

This drops the peak memory when writing a very large indexed memprof
profile by about 2.5G.