From fec57e5b172d5ad6b532b33a7af3b6a80dddf695 Mon Sep 17 00:00:00 2001
From: Hongtao Yu <hoy@fb.com>
Date: Tue, 1 Feb 2022 14:44:37 -0800
Subject: [PATCH] Revert "[llvm-profgen] Clean up unnecessary memory
 reservations between phases."

This reverts commit 057e784b0962a7c5a17e858932bb6f03c7676c47.
---
 llvm/tools/llvm-profgen/PerfReader.cpp   | 1 -
 llvm/tools/llvm-profgen/llvm-profgen.cpp | 3 ---
 2 files changed, 4 deletions(-)

diff --git a/llvm/tools/llvm-profgen/PerfReader.cpp b/llvm/tools/llvm-profgen/PerfReader.cpp
index 98b4c7cdf169..46422ce47089 100644
--- a/llvm/tools/llvm-profgen/PerfReader.cpp
+++ b/llvm/tools/llvm-profgen/PerfReader.cpp
@@ -1212,7 +1212,6 @@ void PerfScriptReader::parsePerfTraces() {
   warnTruncatedStack();
   warnInvalidRange();
   generateUnsymbolizedProfile();
-  AggregatedSamples.clear();
 
   if (SkipSymbolization)
     writeUnsymbolizedProfile(OutputFilename);
diff --git a/llvm/tools/llvm-profgen/llvm-profgen.cpp b/llvm/tools/llvm-profgen/llvm-profgen.cpp
index b2728ae41872..f092df04d52b 100644
--- a/llvm/tools/llvm-profgen/llvm-profgen.cpp
+++ b/llvm/tools/llvm-profgen/llvm-profgen.cpp
@@ -158,9 +158,6 @@ int main(int argc, const char *argv[]) {
       ProfileGeneratorBase::create(Binary.get(), Reader->getSampleCounters(),
                                    Reader->profileIsCSFlat());
   Generator->generateProfile();
-  // The Reader object, espcially its SampleCounters field, is not needed at
-  // this point, so releasing it to reduce peak memory usage.
-  Reader.release();
   Generator->write();
 
   return EXIT_SUCCESS;