[CSSPGO][llvm-profdata] Support trimming cold context when merging profiles

[wenlei]

Summary

The change adds support for triming and merging cold context when mergine CSSPGO profiles using llvm-profdata. This is similar to the context profile trimming in llvm-profgen, however the flexibility to trim cold context after profile is generated can be useful.

A bug fix is also included to make sure PSI thresholds are always calcuated before query.

[wenlei]

llvm/tools/llvm-profdata/CMakeLists.txt

2 ↗

(On Diff #337638)

This is because we now use ProfileSummaryInfo.cpp, so we can get all consistent hot/cold threshold computation and related switches, though pulling in entire Analysis lib is less than ideal. I'm thinking about moving ProfileSummaryInfo into ProfileData/ProfileSummaryBuildder.cpo from Analysis/ProfileSummaryInfo.cpp. But I'd like to get feedback before I move things around.

[wmi]

llvm/tools/llvm-profdata/CMakeLists.txt

2 ↗

(On Diff #337638)

Extract ProfileSummaryInfo from Analysis/ directory sounds reasonable to me. How about move it to Core -- lib/IR/ProfileSummary.cpp for example? The reason is ProfileSummaryInfo interface is used widely. If someday we want to use the interface in Core or Support which ProfileData depends on, it will introduce cyclic dependence. Putting it in Core will clear the problem.

[wenlei]

llvm/tools/llvm-profdata/CMakeLists.txt

2 ↗

(On Diff #337638)

Sounds good. Thanks for the suggestion.

[wenlei]

llvm/tools/llvm-profdata/CMakeLists.txt

2 ↗

(On Diff #337638)

Looks like extracting ProfileSummaryInfo to Core isn't a trivial move. ProfileSummaryInfo has a bunch of interfaces taking BFI as parameter, and also offers invalidation, so it depends on Analysis. It's fine when ProfileSummaryInfo itself is part of Analysis, but if we move it to Core, we will have cyclic dependency. For the same reason, we can't move it to ProfileData either.

If we want to move it, we will need to break it up, so the part that does the threshold computation can be moved, and the part that does the query (relies on Analysis) stays.

Now what I'm thinking about is only moving the threshold/cutoff switches in ProfileSummaryInfo.cpp along with part of ProfileSummaryInfo::computeThresholds into ProfileData/ProfileSummaryBuilder. That won't change dependencies as ProfileSummaryInfo uses ProfileSummaryBuilder already. But it lets tools that only uses ProfileData access consistent threshold computation too.

[wenlei]

Move threshold knobs into ProfileSummaryBuilder, avoid pulling Analysis lib into tools.

[wenlei]

Cleanup.

[wmi]

llvm/tools/llvm-profdata/CMakeLists.txt

2 ↗

(On Diff #337638)

Ok, that sounds good to me. Thanks for trying to find a good solution.

llvm/tools/llvm-profdata/llvm-profdata.cpp

887–891

What will happen if these two flags are enabled for non-CSSPGO sample profile?

llvm/tools/llvm-profgen/CMakeLists.txt

6 ↗

(On Diff #337638)

After the PSI switch and threshold are moved to ProfData, no need to depend on Analysis anymore?

[wenlei]

The dependency on Analysis should be removed in the latest version.

llvm/tools/llvm-profdata/llvm-profdata.cpp

887–891

Good catch, they should be ignored. Added a check.

[wenlei]

Ignore trim/merge flag for non-CS profile.

[wmi]

LGTM, thanks.

llvm/include/llvm/Analysis/ProfileSummaryInfo.h

private:
   // Compute the threshold for a given cutoff.
   Optional<uint64_t> computeThreshold(int PercentileCutoff) const;
   // The map that caches the threshold values. The keys are the percentile
   // cutoff values and the values are the corresponding threshold values.
   mutable DenseMap<int, uint64_t> ThresholdCache;
 
 public:
   ProfileSummaryInfo(const Module &M) : M(&M) { refresh(); }
-  ProfileSummaryInfo(std::unique_ptr<ProfileSummary> PSI)
-      : M(nullptr), Summary(std::move(PSI)) {}
-
   ProfileSummaryInfo(ProfileSummaryInfo &&Arg) = default;
 
   /// If no summary is present, attempt to refresh.
   void refresh();
 
   /// Returns true if profile summary is available.
   bool hasProfileSummary() const { return Summary != nullptr; }
 

llvm/include/llvm/ProfileData/ProfileCommon.h

 
 public:
   /// A vector of useful cutoff values for detailed summary.
   static const ArrayRef<uint32_t> DefaultCutoffs;
 
   /// Find the summary entry for a desired percentile of counts.
   static const ProfileSummaryEntry &
   getEntryForPercentile(SummaryEntryVector &DS, uint64_t Percentile);
+  static uint64_t getHotCountThreshold(SummaryEntryVector &DS);
+  static uint64_t getColdCountThreshold(SummaryEntryVector &DS);
 };
 
 class InstrProfSummaryBuilder final : public ProfileSummaryBuilder {
   uint64_t MaxInternalBlockCount = 0;
 
   inline void addEntryCount(uint64_t Count);
   inline void addInternalCount(uint64_t Count);
 

llvm/lib/Analysis/ProfileSummaryInfo.cpp

 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
 #include "llvm/IR/ProfileSummary.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/ProfileData/ProfileCommon.h"
 #include "llvm/Support/CommandLine.h"
 using namespace llvm;
 
-// The following two parameters determine the threshold for a count to be
-// considered hot/cold. These two parameters are percentile values (multiplied
-// by 10000). If the counts are sorted in descending order, the minimum count to
-// reach ProfileSummaryCutoffHot gives the threshold to determine a hot count.
-// Similarly, the minimum count to reach ProfileSummaryCutoffCold gives the
-// threshold for determining cold count (everything <= this threshold is
-// considered cold).
-
-static cl::opt<int> ProfileSummaryCutoffHot(
-    "profile-summary-cutoff-hot", cl::Hidden, cl::init(990000), cl::ZeroOrMore,
-    cl::desc("A count is hot if it exceeds the minimum count to"
-             " reach this percentile of total counts."));
-
-static cl::opt<int> ProfileSummaryCutoffCold(
-    "profile-summary-cutoff-cold", cl::Hidden, cl::init(999999), cl::ZeroOrMore,
-    cl::desc("A count is cold if it is below the minimum count"
-             " to reach this percentile of total counts."));
-
-static cl::opt<unsigned> ProfileSummaryHugeWorkingSetSizeThreshold(
-    "profile-summary-huge-working-set-size-threshold", cl::Hidden,
-    cl::init(15000), cl::ZeroOrMore,
-    cl::desc("The code working set size is considered huge if the number of"
-             " blocks required to reach the -profile-summary-cutoff-hot"
-             " percentile exceeds this count."));
-
-static cl::opt<unsigned> ProfileSummaryLargeWorkingSetSizeThreshold(
-    "profile-summary-large-working-set-size-threshold", cl::Hidden,
-    cl::init(12500), cl::ZeroOrMore,
-    cl::desc("The code working set size is considered large if the number of"
-             " blocks required to reach the -profile-summary-cutoff-hot"
-             " percentile exceeds this count."));
-
-// The next two options override the counts derived from summary computation and
-// are useful for debugging purposes.
-static cl::opt<int> ProfileSummaryHotCount(
-    "profile-summary-hot-count", cl::ReallyHidden, cl::ZeroOrMore,
-    cl::desc("A fixed hot count that overrides the count derived from"
-             " profile-summary-cutoff-hot"));
-
-static cl::opt<int> ProfileSummaryColdCount(
-    "profile-summary-cold-count", cl::ReallyHidden, cl::ZeroOrMore,
-    cl::desc("A fixed cold count that overrides the count derived from"
-             " profile-summary-cutoff-cold"));
+// Knobs for profile summary based thresholds.
+extern cl::opt<int> ProfileSummaryCutoffHot;
+extern cl::opt<int> ProfileSummaryCutoffCold;
+extern cl::opt<unsigned> ProfileSummaryHugeWorkingSetSizeThreshold;
+extern cl::opt<unsigned> ProfileSummaryLargeWorkingSetSizeThreshold;
+extern cl::opt<int> ProfileSummaryHotCount;
+extern cl::opt<int> ProfileSummaryColdCount;
 
 static cl::opt<bool> PartialProfile(
     "partial-profile", cl::Hidden, cl::init(false),
     cl::desc("Specify the current profile is used as a partial profile."));
 
 cl::opt<bool> ScalePartialSampleProfileWorkingSetSize(
     "scale-partial-sample-profile-working-set-size", cl::Hidden, cl::init(true),
     cl::desc(
bool ProfileSummaryInfo::isFunctionEntryCold(const Function *F) const {
   return FunctionCount && isColdCount(FunctionCount.getCount());
 }
 
 /// Compute the hot and cold thresholds.
 void ProfileSummaryInfo::computeThresholds() {
   auto &DetailedSummary = Summary->getDetailedSummary();
   auto &HotEntry = ProfileSummaryBuilder::getEntryForPercentile(
       DetailedSummary, ProfileSummaryCutoffHot);
-  HotCountThreshold = HotEntry.MinCount;
-  if (ProfileSummaryHotCount.getNumOccurrences() > 0)
-    HotCountThreshold = ProfileSummaryHotCount;
-  auto &ColdEntry = ProfileSummaryBuilder::getEntryForPercentile(
-      DetailedSummary, ProfileSummaryCutoffCold);
-  ColdCountThreshold = ColdEntry.MinCount;
-  if (ProfileSummaryColdCount.getNumOccurrences() > 0)
-    ColdCountThreshold = ProfileSummaryColdCount;
+  HotCountThreshold =
+      ProfileSummaryBuilder::getHotCountThreshold(DetailedSummary);
+  ColdCountThreshold =
+      ProfileSummaryBuilder::getColdCountThreshold(DetailedSummary);
   assert(ColdCountThreshold <= HotCountThreshold &&
          "Cold count threshold cannot exceed hot count threshold!");
   if (!hasPartialSampleProfile() || !ScalePartialSampleProfileWorkingSetSize) {
     HasHugeWorkingSetSize =
         HotEntry.NumCounts > ProfileSummaryHugeWorkingSetSizeThreshold;
     HasLargeWorkingSetSize =
         HotEntry.NumCounts > ProfileSummaryLargeWorkingSetSizeThreshold;
   } else {

llvm/lib/ProfileData/ProfileSummaryBuilder.cpp

 #include "llvm/Support/CommandLine.h"
 
 using namespace llvm;
 
 cl::opt<bool> UseContextLessSummary(
     "profile-summary-contextless", cl::Hidden, cl::init(false), cl::ZeroOrMore,
     cl::desc("Merge context profiles before calculating thresholds."));
 
+// The following two parameters determine the threshold for a count to be
+// considered hot/cold. These two parameters are percentile values (multiplied
+// by 10000). If the counts are sorted in descending order, the minimum count to
+// reach ProfileSummaryCutoffHot gives the threshold to determine a hot count.
+// Similarly, the minimum count to reach ProfileSummaryCutoffCold gives the
+// threshold for determining cold count (everything <= this threshold is
+// considered cold).
+cl::opt<int> ProfileSummaryCutoffHot(
+    "profile-summary-cutoff-hot", cl::Hidden, cl::init(990000), cl::ZeroOrMore,
+    cl::desc("A count is hot if it exceeds the minimum count to"
+             " reach this percentile of total counts."));
+
+cl::opt<int> ProfileSummaryCutoffCold(
+    "profile-summary-cutoff-cold", cl::Hidden, cl::init(999999), cl::ZeroOrMore,
+    cl::desc("A count is cold if it is below the minimum count"
+             " to reach this percentile of total counts."));
+
+cl::opt<unsigned> ProfileSummaryHugeWorkingSetSizeThreshold(
+    "profile-summary-huge-working-set-size-threshold", cl::Hidden,
+    cl::init(15000), cl::ZeroOrMore,
+    cl::desc("The code working set size is considered huge if the number of"
+             " blocks required to reach the -profile-summary-cutoff-hot"
+             " percentile exceeds this count."));
+
+cl::opt<unsigned> ProfileSummaryLargeWorkingSetSizeThreshold(
+    "profile-summary-large-working-set-size-threshold", cl::Hidden,
+    cl::init(12500), cl::ZeroOrMore,
+    cl::desc("The code working set size is considered large if the number of"
+             " blocks required to reach the -profile-summary-cutoff-hot"
+             " percentile exceeds this count."));
+
+// The next two options override the counts derived from summary computation and
+// are useful for debugging purposes.
+cl::opt<int> ProfileSummaryHotCount(
+    "profile-summary-hot-count", cl::ReallyHidden, cl::ZeroOrMore,
+    cl::desc("A fixed hot count that overrides the count derived from"
+             " profile-summary-cutoff-hot"));
+
+cl::opt<int> ProfileSummaryColdCount(
+    "profile-summary-cold-count", cl::ReallyHidden, cl::ZeroOrMore,
+    cl::desc("A fixed cold count that overrides the count derived from"
+             " profile-summary-cutoff-cold"));
+
 // A set of cutoff values. Each value, when divided by ProfileSummary::Scale
 // (which is 1000000) is a desired percentile of total counts.
 static const uint32_t DefaultCutoffsData[] = {
     10000,  /*  1% */
     100000, /* 10% */
     200000, 300000, 400000, 500000, 600000, 700000, 800000,
     900000, 950000, 990000, 999000, 999900, 999990, 999999};
 const ArrayRef<uint32_t> ProfileSummaryBuilder::DefaultCutoffs =
while (CurrSum < DesiredCount && Iter != End) {
       Iter++;
     }
     assert(CurrSum >= DesiredCount);
     ProfileSummaryEntry PSE = {Cutoff, Count, CountsSeen};
     DetailedSummary.push_back(PSE);
   }
 }
 
+uint64_t ProfileSummaryBuilder::getHotCountThreshold(SummaryEntryVector &DS) {
+  auto &HotEntry =
+      ProfileSummaryBuilder::getEntryForPercentile(DS, ProfileSummaryCutoffHot);
+  uint64_t HotCountThreshold = HotEntry.MinCount;
+  if (ProfileSummaryHotCount.getNumOccurrences() > 0)
+    HotCountThreshold = ProfileSummaryHotCount;
+  return HotCountThreshold;
+}
+
+uint64_t ProfileSummaryBuilder::getColdCountThreshold(SummaryEntryVector &DS) {
+  auto &ColdEntry = ProfileSummaryBuilder::getEntryForPercentile(
+      DS, ProfileSummaryCutoffCold);
+  uint64_t ColdCountThreshold = ColdEntry.MinCount;
+  if (ProfileSummaryColdCount.getNumOccurrences() > 0)
+    ColdCountThreshold = ProfileSummaryColdCount;
+  return ColdCountThreshold;
+}
+
 std::unique_ptr<ProfileSummary> SampleProfileSummaryBuilder::getSummary() {
   computeDetailedSummary();
   return std::make_unique<ProfileSummary>(
       ProfileSummary::PSK_Sample, DetailedSummary, TotalCount, MaxCount, 0,
       MaxFunctionCount, NumCounts, NumFunctions);
 }
 
 std::unique_ptr<ProfileSummary>

llvm/test/tools/llvm-profdata/cs-sample-trimmer.test

+RUN: llvm-profdata merge --sample --text -output=%t.proftext %S/Inputs/cs-sample.proftext
+RUN: diff -b %t.proftext %S/Inputs/cs-sample.proftext
+
+RUN: llvm-profdata merge --sample --text -output=%t.proftext %S/Inputs/cs-sample.proftext -sample-merge-cold-context -profile-summary-cold-count=500
+RUN: FileCheck %s --input-file %t.proftext --check-prefixes=CHECK-TRIM,CHECK-MERGE
+RUN: llvm-profdata merge --sample --text -output=%t.proftext %S/Inputs/cs-sample.proftext -sample-merge-cold-context -sample-trim-cold-context -profile-summary-cold-count=500
+RUN: FileCheck %s --input-file %t.proftext --check-prefixes=CHECK-TRIM,CHECK-END
+RUN: llvm-profdata merge --sample --text -output=%t.proftext %S/Inputs/cs-sample.proftext -sample-merge-cold-context -sample-trim-cold-context -profile-summary-cutoff-cold=990000
+RUN: FileCheck %s --input-file %t.proftext --check-prefixes=CHECK-TRIM,CHECK-END
+
+CHECK-TRIM:      [main:3 @ _Z5funcAi:1 @ _Z8funcLeafi]:1467299:11
+CHECK-TRIM-NEXT:  0: 6
+CHECK-TRIM-NEXT:  1: 6
+CHECK-TRIM-NEXT:  3: 287884
+CHECK-TRIM-NEXT:  4: 287864 _Z3fibi:315608
+CHECK-TRIM-NEXT:  15: 23
+CHECK-TRIM-NEXT:  !Attributes: 0
+CHECK-TRIM-NEXT: [main:3.1 @ _Z5funcBi:1 @ _Z8funcLeafi]:500853:20
+CHECK-TRIM-NEXT:  0: 15
+CHECK-TRIM-NEXT:  1: 15
+CHECK-TRIM-NEXT:  3: 74946
+CHECK-TRIM-NEXT:  4: 74941 _Z3fibi:82359
+CHECK-TRIM-NEXT:  10: 23324
+CHECK-TRIM-NEXT:  11: 23327 _Z3fibi:25228
+CHECK-TRIM-NEXT:  15: 11
+CHECK-TRIM-NEXT:  !Attributes: 1
+CHECK-END-NOT:   [
+CHECK-MERGE:     [_Z5funcBi]:360:32
+CHECK-MERGE-NEXT: 0: 32
+CHECK-MERGE-NEXT: 1: 32 _Z8funcLeafi:20
+CHECK-MERGE-NEXT: 3: 12
+CHECK-MERGE-NEXT: !Attributes: 0
+CHECK-MERGE-NEXT:[main]:308:12
+CHECK-MERGE-NEXT: 2: 24
+CHECK-MERGE-NEXT: 3: 28 _Z5funcAi:18
+CHECK-MERGE-NEXT: 3.1: 28 _Z5funcBi:30
+CHECK-MERGE-NEXT: !Attributes: 0
+CHECK-MERGE-NEXT:[_Z5funcAi]:99:11
+CHECK-MERGE-NEXT: 0: 10
+CHECK-MERGE-NEXT: 1: 10 _Z8funcLeafi:11
+CHECK-MERGE-NEXT: 3: 24
+CHECK-MERGE-NEXT: !Attributes: 0

llvm/test/tools/llvm-profgen/cs-preinline.test

 ; Test default llvm-profgen with preinline off
 ; RUN: llvm-profgen --perfscript=%S/Inputs/inline-cs-noprobe.perfscript --binary=%S/Inputs/inline-cs-noprobe.perfbin --output=%t
 ; RUN: FileCheck %s --input-file %t --check-prefix=CHECK-DEFAULT
 
 ; Test llvm-profgen with preinliner on will merge not inlinable profile into base profile.
 ; RUN: llvm-profgen --perfscript=%S/Inputs/inline-cs-noprobe.perfscript --binary=%S/Inputs/inline-cs-noprobe.perfbin --output=%t --csspgo-preinliner=1
 ; RUN: FileCheck %s --input-file %t --check-prefix=CHECK-PREINL
 
 ; Test preinliner threshold that prevents all possible inlining and merges everything into base profile.
-; RUN: llvm-profgen --perfscript=%S/Inputs/inline-cs-noprobe.perfscript --binary=%S/Inputs/inline-cs-noprobe.perfbin --output=%t --csspgo-preinliner=1  -sample-profile-hot-inline-threshold=0
+; RUN: llvm-profgen --perfscript=%S/Inputs/inline-cs-noprobe.perfscript --binary=%S/Inputs/inline-cs-noprobe.perfbin --output=%t --csspgo-preinliner=1  -sample-profile-cold-inline-threshold=0
 ; RUN: FileCheck %s --input-file %t --check-prefix=CHECK-NO-PREINL
 
 ; CHECK-DEFAULT:     [main:1 @ foo]:309:0
 ; CHECK-DEFAULT-NEXT: 2.1: 14
 ; CHECK-DEFAULT-NEXT: 3: 15
 ; CHECK-DEFAULT-NEXT: 3.1: 14 bar:14
 ; CHECK-DEFAULT-NEXT: 3.2: 1
 ; CHECK-DEFAULT-NEXT: !Attributes: 1

llvm/tools/llvm-profdata/llvm-profdata.cpp

else
       Writer.setPartialProfile();
   }
 }
 
 static void
 mergeSampleProfile(const WeightedFileVector &Inputs, SymbolRemapper *Remapper,
                    StringRef OutputFilename, ProfileFormat OutputFormat,
                    StringRef ProfileSymbolListFile, bool CompressAllSections,
-                   bool UseMD5, bool GenPartialProfile, FailureMode FailMode) {
+                   bool UseMD5, bool GenPartialProfile,
+                   bool SampleMergeColdContext, bool SampleTrimColdContext,
+                   FailureMode FailMode) {
   using namespace sampleprof;
   StringMap<FunctionSamples> ProfileMap;
   SmallVector<std::unique_ptr<sampleprof::SampleProfileReader>, 5> Readers;
   LLVMContext Context;
   sampleprof::ProfileSymbolList WriterList;
   Optional<bool> ProfileIsProbeBased;
   Optional<bool> ProfileIsCS;
   for (const auto &Input : Inputs) {
for (StringMap<FunctionSamples>::iterator I = Profiles.begin(),
       }
     }
 
     std::unique_ptr<sampleprof::ProfileSymbolList> ReaderList =
         Reader->getProfileSymbolList();
     if (ReaderList)
       WriterList.merge(*ReaderList);
   }
+
+  if (ProfileIsCS && (SampleMergeColdContext || SampleTrimColdContext)) {
+    // Use threshold calculated from profile summary unless specified.
+    SampleProfileSummaryBuilder Builder(ProfileSummaryBuilder::DefaultCutoffs);
+    auto Summary = Builder.computeSummaryForProfiles(ProfileMap);
+    uint64_t SampleProfColdThreshold =
+        ProfileSummaryBuilder::getColdCountThreshold(
+            (Summary->getDetailedSummary()));
+
+    // Trim and merge cold context profile using cold threshold above;
+    SampleContextTrimmer(ProfileMap)
+        .trimAndMergeColdContextProfiles(SampleProfColdThreshold,
+                                         SampleTrimColdContext,
+                                         SampleMergeColdContext);
+  }
+
   auto WriterOrErr =
       SampleProfileWriter::create(OutputFilename, FormatMap[OutputFormat]);
   if (std::error_code EC = WriterOrErr.getError())
     exitWithErrorCode(EC, OutputFilename);
 
   auto Writer = std::move(WriterOrErr.get());
   // WriterList will have StringRef refering to string in Buffer.
   // Make sure Buffer lives as long as WriterList.
static int merge_main(int argc, const char *argv[]) {
   cl::opt<bool> CompressAllSections(
       "compress-all-sections", cl::init(false), cl::Hidden,
       cl::desc("Compress all sections when writing the profile (only "
                "meaningful for -extbinary)"));
   cl::opt<bool> UseMD5(
       "use-md5", cl::init(false), cl::Hidden,
       cl::desc("Choose to use MD5 to represent string in name table (only "
                "meaningful for -extbinary)"));
+  cl::opt<bool> SampleMergeColdContext(
+      "sample-merge-cold-context", cl::init(false), cl::Hidden,
+      cl::desc(
+          "Merge context sample profiles whose count is below cold threshold"));
+  cl::opt<bool> SampleTrimColdContext(
+      "sample-trim-cold-context", cl::init(false), cl::Hidden,
+      cl::desc(
+          "Trim context sample profiles whose count is below cold threshold"));
   cl::opt<bool> GenPartialProfile(
       "gen-partial-profile", cl::init(false), cl::Hidden,
       cl::desc("Generate a partial profile (only meaningful for -extbinary)"));
   cl::opt<std::string> SupplInstrWithSample(
       "supplement-instr-with-sample", cl::init(""), cl::Hidden,
       cl::desc("Supplement an instr profile with sample profile, to correct "
                "the profile unrepresentativeness issue. The sample "
                "profile is the input of the flag. Output will be in instr "
static int merge_main(int argc, const char *argv[]) {
   }
 
   if (ProfileKind == instr)
     mergeInstrProfile(WeightedInputs, Remapper.get(), OutputFilename,
                       OutputFormat, OutputSparse, NumThreads, FailureMode);
   else
     mergeSampleProfile(WeightedInputs, Remapper.get(), OutputFilename,
                        OutputFormat, ProfileSymbolListFile, CompressAllSections,
-                       UseMD5, GenPartialProfile, FailureMode);
+                       UseMD5, GenPartialProfile, SampleMergeColdContext,
+                       SampleTrimColdContext, FailureMode);
 
   return 0;
 }
 
 /// Computer the overlap b/w profile BaseFilename and profile TestFilename.
 static void overlapInstrProfile(const std::string &BaseFilename,
                                 const std::string &TestFilename,
                                 const OverlapFuncFilters &FuncFilter,

llvm/tools/llvm-profgen/ProfileGenerator.h

 //===-- ProfileGenerator.h - Profile Generator -----------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_TOOLS_LLVM_PROGEN_PROFILEGENERATOR_H
 #define LLVM_TOOLS_LLVM_PROGEN_PROFILEGENERATOR_H
 #include "CSPreInliner.h"
 #include "ErrorHandling.h"
 #include "PerfReader.h"
 #include "ProfiledBinary.h"
-#include "llvm/Analysis/ProfileSummaryInfo.h"
 #include "llvm/ProfileData/SampleProfWriter.h"
 #include <memory>
 #include <unordered_set>
 
 using namespace llvm;
 using namespace sampleprof;
 
 namespace llvm {
FunctionSamples &getFunctionProfileForContext(StringRef ContextId,
                                                 bool WasLeafInlined = false);
   // Post processing for profiles before writing out, such as mermining
   // and trimming cold profiles, running preinliner on profiles.
   void postProcessProfiles();
   void computeSummaryAndThreshold();
   void write(std::unique_ptr<SampleProfileWriter> Writer,
              StringMap<FunctionSamples> &ProfileMap) override;
 
-  // Profile summary to answer isHotCount and isColdCount queries.
-  std::unique_ptr<ProfileSummaryInfo> PSI;
+  // Thresholds from profile summary to answer isHotCount/isColdCount queries.
+  uint64_t HotCountThreshold;
+  uint64_t ColdCountThreshold;
 
   // String table owning context strings created from profile generation.
   std::unordered_set<std::string> ContextStrings;
 
 private:
   // Helper function for updating body sample for a leaf location in
   // FunctionProfile
   void updateBodySamplesforFunctionProfile(FunctionSamples &FunctionProfile,

llvm/tools/llvm-profgen/ProfileGenerator.cpp

 
 void CSProfileGenerator::postProcessProfiles() {
   // Compute hot/cold threshold based on profile. This will be used for cold
   // context profile merging/trimming.
   computeSummaryAndThreshold();
 
   // Run global pre-inliner to adjust/merge context profile based on estimated
   // inline decisions.
-  CSPreInliner(ProfileMap, PSI->getHotCountThreshold(),
-               PSI->getColdCountThreshold())
-      .run();
+  CSPreInliner(ProfileMap, HotCountThreshold, ColdCountThreshold).run();
 
   // Trim and merge cold context profile using cold threshold above;
   SampleContextTrimmer(ProfileMap)
       .trimAndMergeColdContextProfiles(
-          CSProfColdThreshold, CSProfTrimColdContext, CSProfMergeColdContext);
+          ColdCountThreshold, CSProfTrimColdContext, CSProfMergeColdContext);
 }
 
 void CSProfileGenerator::computeSummaryAndThreshold() {
   SampleProfileSummaryBuilder Builder(ProfileSummaryBuilder::DefaultCutoffs);
   auto Summary = Builder.computeSummaryForProfiles(ProfileMap);
-  PSI.reset(new ProfileSummaryInfo(std::move(Summary)));
+  HotCountThreshold = ProfileSummaryBuilder::getHotCountThreshold(
+      (Summary->getDetailedSummary()));
+  ColdCountThreshold = ProfileSummaryBuilder::getColdCountThreshold(
+      (Summary->getDetailedSummary()));
 
   // Use threshold calculated from profile summary unless specified.
-  if (!CSProfColdThreshold.getNumOccurrences()) {
-    CSProfColdThreshold = PSI->getColdCountThreshold();
+  if (CSProfColdThreshold.getNumOccurrences()) {
+    ColdCountThreshold = CSProfColdThreshold;
   }
 }
 
 void CSProfileGenerator::write(std::unique_ptr<SampleProfileWriter> Writer,
                                StringMap<FunctionSamples> &ProfileMap) {
   if (std::error_code EC = Writer->write(ProfileMap))
     exitWithError(std::move(EC));
 }