diff --git a/llvm/include/llvm/ProfileData/SampleProf.h b/llvm/include/llvm/ProfileData/SampleProf.h
--- a/llvm/include/llvm/ProfileData/SampleProf.h
+++ b/llvm/include/llvm/ProfileData/SampleProf.h
@@ -721,7 +721,7 @@
 using BodySampleMap = std::map<LineLocation, SampleRecord>;
 // NOTE: Using a StringMap here makes parsed profiles consume around 17% more
 // memory, which is *very* significant for large profiles.
-using FunctionSamplesMap = std::map<std::string, FunctionSamples, std::less<>>;
+using FunctionSamplesMap = std::map<StringRef, FunctionSamples, std::less<>>;
 using CallsiteSampleMap = std::map<LineLocation, FunctionSamplesMap>;
 using LocToLocMap =
     std::unordered_map<LineLocation, LineLocation, LineLocationHash>;
diff --git a/llvm/lib/ProfileData/SampleProf.cpp b/llvm/lib/ProfileData/SampleProf.cpp
--- a/llvm/lib/ProfileData/SampleProf.cpp
+++ b/llvm/lib/ProfileData/SampleProf.cpp
@@ -535,7 +535,7 @@
     } else if (GenerateMergedBaseProfiles) {
       ProfileMap[ChildProfile->getContext()].merge(*ChildProfile);
       auto &SamplesMap = NodeProfile->functionSamplesAt(ChildNode.CallSiteLoc);
-      SamplesMap[ChildProfile->getName().str()].getContext().setAttribute(
+      SamplesMap[ChildProfile->getName()].getContext().setAttribute(
           ContextDuplicatedIntoBase);
     }
 
diff --git a/llvm/lib/ProfileData/SampleProfReader.cpp b/llvm/lib/ProfileData/SampleProfReader.cpp
--- a/llvm/lib/ProfileData/SampleProfReader.cpp
+++ b/llvm/lib/ProfileData/SampleProfReader.cpp
@@ -394,7 +394,7 @@
       switch (LineTy) {
       case LineType::CallSiteProfile: {
         FunctionSamples &FSamples = InlineStack.back()->functionSamplesAt(
-            LineLocation(LineOffset, Discriminator))[std::string(FName)];
+            LineLocation(LineOffset, Discriminator))[FName];
         FSamples.setName(FName);
         MergeResult(Result, FSamples.addTotalSamples(NumSamples));
         InlineStack.push_back(&FSamples);
@@ -643,7 +643,7 @@
     uint32_t DiscriminatorVal = (*Discriminator) & getDiscriminatorMask();
 
     FunctionSamples &CalleeProfile = FProfile.functionSamplesAt(
-        LineLocation(*LineOffset, DiscriminatorVal))[std::string(*FName)];
+        LineLocation(*LineOffset, DiscriminatorVal))[*FName];
     CalleeProfile.setName(*FName);
     if (std::error_code EC = readProfile(CalleeProfile))
       return EC;
@@ -1193,7 +1193,7 @@
           CalleeProfile = const_cast<FunctionSamples *>(
               &FProfile->functionSamplesAt(LineLocation(
                   *LineOffset,
-                  *Discriminator))[std::string(FContext.get().getName())]);
+                  *Discriminator))[FContext->getName()]);
         }
         if (std::error_code EC =
                 readFuncMetadata(ProfileHasAttribute, CalleeProfile))
@@ -1614,7 +1614,7 @@
     uint32_t LineOffset = Offset >> 16;
     uint32_t Discriminator = Offset & 0xffff;
     FProfile = &CallerProfile->functionSamplesAt(
-        LineLocation(LineOffset, Discriminator))[std::string(Name)];
+        LineLocation(LineOffset, Discriminator))[Name];
   }
   FProfile->setName(Name);
 
diff --git a/llvm/unittests/ProfileData/SampleProfTest.cpp b/llvm/unittests/ProfileData/SampleProfTest.cpp
--- a/llvm/unittests/ProfileData/SampleProfTest.cpp
+++ b/llvm/unittests/ProfileData/SampleProfTest.cpp
@@ -157,7 +157,7 @@
     // Add inline instance with name "_Z3gooi".
     StringRef GooName("_Z3gooi");
     auto &GooSamples =
-        FooSamples.functionSamplesAt(LineLocation(7, 0))[GooName.str()];
+        FooSamples.functionSamplesAt(LineLocation(7, 0))[GooName];
     GooSamples.setName(GooName);
     GooSamples.addTotalSamples(502);
     GooSamples.addBodySamples(3, 0, 502);
@@ -165,7 +165,7 @@
     // Add inline instance with name "_Z3hooi".
     StringRef HooName("_Z3hooi");
     auto &HooSamples =
-        GooSamples.functionSamplesAt(LineLocation(9, 0))[HooName.str()];
+        GooSamples.functionSamplesAt(LineLocation(9, 0))[HooName];
     HooSamples.setName(HooName);
     HooSamples.addTotalSamples(317);
     HooSamples.addBodySamples(4, 0, 317);