diff --git a/llvm/test/tools/llvm-profgen/Inputs/recursion-compression-pseudoprobe-nommap.perfscript b/llvm/test/tools/llvm-profgen/Inputs/recursion-compression-pseudoprobe-nommap.perfscript
new file mode 100644
--- /dev/null
+++ b/llvm/test/tools/llvm-profgen/Inputs/recursion-compression-pseudoprobe-nommap.perfscript
@@ -0,0 +1,21 @@
+	          2017db
+	          2017ba
+	          2017e5
+	          2017ba
+	          2017e5
+	          2017d9
+	          2017ba
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017b0
+	          2017e5
+	          2017d9
+	          201847
+	    7fcb072a67c3
+	5541f689495641d7
+ 0x2017cd/0x2017db/P/-/-/0  0x2017b5/0x2017c0/P/-/-/0  0x2017a7/0x2017b2/P/-/-/0  0x2017e0/0x2017a0/P/-/-/0  0x2017cd/0x2017db/P/-/-/0  0x2017b5/0x2017c0/P/-/-/0  0x2017a7/0x2017b2/P/-/-/0  0x2017e0/0x2017a0/P/-/-/0  0x2017cd/0x2017db/P/-/-/0  0x2017d4/0x2017c0/P/-/-/0  0x2017b5/0x2017c0/P/-/-/0  0x2017a7/0x2017b2/P/-/-/0  0x2017ab/0x2017a0/P/-/-/0  0x2017ab/0x2017a0/P/-/-/0  0x2017ab/0x2017a0/P/-/-/0  0x2017ab/0x2017a0/P/-/-/0
diff --git a/llvm/test/tools/llvm-profgen/recursion-compression-pseudoprobe.test b/llvm/test/tools/llvm-profgen/recursion-compression-pseudoprobe.test
--- a/llvm/test/tools/llvm-profgen/recursion-compression-pseudoprobe.test
+++ b/llvm/test/tools/llvm-profgen/recursion-compression-pseudoprobe.test
@@ -3,6 +3,9 @@
 ; RUN: FileCheck %s --input-file %t -check-prefix=CHECK-UNCOMPRESS
 ; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/recursion-compression-pseudoprobe.perfscript --binary=%S/Inputs/recursion-compression-pseudoprobe.perfbin --output=%t --show-unwinder-output --profile-summary-cold-count=0 | FileCheck %s --check-prefix=CHECK-UNWINDER
 ; RUN: FileCheck %s --input-file %t
+; RUN: llvm-profgen --format=text --perfscript=%S/Inputs/recursion-compression-pseudoprobe-nommap.perfscript --binary=%S/Inputs/recursion-compression-pseudoprobe.perfbin --output=%t --show-unwinder-output --profile-summary-cold-count=0 | FileCheck %s --check-prefix=CHECK-UNWINDER
+; RUN: FileCheck %s --input-file %t
+
 
 ; CHECK-UNCOMPRESS: [main:2 @ foo:5 @ fa:8 @ fa:7 @ fb:5 @ fb:5 @ fb:5 @ fb:5 @ fb:5 @ fb:5 @ fb:5 @ fb:5 @ fb:6 @ fa:8 @ fa:7 @ fb:6 @ fa]:4:1
 ; CHECK-UNCOMPRESS:  1: 1
diff --git a/llvm/tools/llvm-profgen/PerfReader.cpp b/llvm/tools/llvm-profgen/PerfReader.cpp
--- a/llvm/tools/llvm-profgen/PerfReader.cpp
+++ b/llvm/tools/llvm-profgen/PerfReader.cpp
@@ -317,7 +317,14 @@
     exitWithError(ErrorMsg);
   }
 
-  return Ret.first->second;
+  // Initialize the base address to preferred address.
+  ProfiledBinary &B = Ret.first->second;
+  uint64_t PreferredAddr = B.getPreferredBaseAddress();
+  AddrToBinaryMap[PreferredAddr] = &B;
+  B.setBaseAddress(PreferredAddr);
+  B.setIsLoadedByMMap(false);
+
+  return B;
 }
 
 void PerfReaderBase::updateBinaryAddress(const MMapEvent &Event) {
@@ -327,11 +334,15 @@
 
   auto I = BinaryTable.find(BinaryName);
   // Drop the event which doesn't belong to user-provided binaries
-  // or if its image is loaded at the same address
-  if (I == BinaryTable.end() || Event.Address == I->second.getBaseAddress())
+  if (I == BinaryTable.end())
     return;
 
   ProfiledBinary &Binary = I->second;
+  // Drop the event if its image is loaded at the same address
+  if (Event.Address == Binary.getBaseAddress()) {
+    Binary.setIsLoadedByMMap(true);
+    return;
+  }
 
   if (Event.Offset == Binary.getTextSegmentOffset()) {
     // A binary image could be unloaded and then reloaded at different
@@ -344,6 +355,8 @@
 
     // Update binary load address.
     Binary.setBaseAddress(Event.Address);
+
+    Binary.setIsLoadedByMMap(true);
   } else {
     // Verify segments are loaded consecutively.
     const auto &Offsets = Binary.getTextSegmentOffsets();
@@ -630,7 +643,14 @@
     return;
   }
   // Set the binary current sample belongs to
-  Sample->Binary = getBinary(Sample->CallStack.front());
+  ProfiledBinary *PB = getBinary(Sample->CallStack.front());
+  Sample->Binary = PB;
+  if (!PB->getMissingMMapWarned() && !PB->getIsLoadedByMMap()) {
+    WithColor::warning() << "No relevant mmap event is matched, will use "
+                            "preferred address as the base loading address!\n";
+    // Avoid redundant warning, only warn at the first unmatched sample.
+    PB->setMissingMMapWarned(true);
+  }
 
   if (!TraceIt.isAtEoF() && TraceIt.getCurrentLine().startswith(" 0x")) {
     // Parsing LBR stack and populate into HybridSample.LBRStack
diff --git a/llvm/tools/llvm-profgen/ProfiledBinary.h b/llvm/tools/llvm-profgen/ProfiledBinary.h
--- a/llvm/tools/llvm-profgen/ProfiledBinary.h
+++ b/llvm/tools/llvm-profgen/ProfiledBinary.h
@@ -140,6 +140,12 @@
 
   bool UsePseudoProbes = false;
 
+  // Indicate if the base loading address is parsed from the mmap event or uses
+  // the preferred address
+  bool IsLoadedByMMap = false;
+  // Use to avoid redundant warning.
+  bool MissingMMapWarned = false;
+
   void setPreferredTextSegmentAddresses(const ELFObjectFileBase *O);
 
   template <class ELFT>
@@ -278,6 +284,14 @@
   const PseudoProbeFuncDesc *getInlinerDescForProbe(const PseudoProbe *Probe) {
     return ProbeDecoder.getInlinerDescForProbe(Probe);
   }
+
+  bool getIsLoadedByMMap() { return IsLoadedByMMap; }
+
+  void setIsLoadedByMMap(bool Value) { IsLoadedByMMap = Value; }
+
+  bool getMissingMMapWarned() { return MissingMMapWarned; }
+
+  void setMissingMMapWarned(bool Value) { MissingMMapWarned = Value; }
 };
 
 } // end namespace sampleprof