diff --git a/llvm/lib/Transforms/IPO/SampleProfile.cpp b/llvm/lib/Transforms/IPO/SampleProfile.cpp
--- a/llvm/lib/Transforms/IPO/SampleProfile.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfile.cpp
@@ -95,6 +95,9 @@
 using ProfileCount = Function::ProfileCount;
 #define DEBUG_TYPE "sample-profile"
 #define CSINLINE_DEBUG DEBUG_TYPE "-inline"
+#define PRELINK_CSINLINE_DEBUG_TYPE "prelink-" CSINLINE_DEBUG
+#define POSTLINK_CSINLINE_DEBUG_TYPE "postlink-" CSINLINE_DEBUG
+#define MAIN_CSINLINE_DEBUG_TYPE "main-" CSINLINE_DEBUG
 
 STATISTIC(NumCSInlined,
           "Number of functions inlined with context sensitive profile");
@@ -293,6 +296,11 @@
     "overwrite-existing-weights", cl::Hidden, cl::init(false),
     cl::desc("Ignore existing branch weights on IR and always overwrite."));
 
+static cl::opt<bool> AnnotateSampleProfileInlinePhase(
+    "annotate-sample-profile-inline-phase", cl::Hidden, cl::init(false),
+    cl::desc("Annotate LTO phase (prelink / postlink), or main (no LTO) for "
+             "sample-profile inline pass name."));
+
 extern cl::opt<bool> EnableExtTspBlockPlacement;
 
 namespace {
@@ -580,6 +588,24 @@
   TargetLibraryInfoWrapperPass *TLIWP = nullptr;
 };
 
+static inline const char *getAnnotatedRemarkPassName(ThinOrFullLTOPhase phase) {
+
+  if (!AnnotateSampleProfileInlinePhase)
+    return CSINLINE_DEBUG;
+
+  switch (phase) {
+  case llvm::ThinOrFullLTOPhase::ThinLTOPreLink:
+  case llvm::ThinOrFullLTOPhase::FullLTOPreLink:
+    return PRELINK_CSINLINE_DEBUG_TYPE;
+  case llvm::ThinOrFullLTOPhase::ThinLTOPostLink:
+  case llvm::ThinOrFullLTOPhase::FullLTOPostLink:
+    return POSTLINK_CSINLINE_DEBUG_TYPE;
+  default:
+    return MAIN_CSINLINE_DEBUG_TYPE;
+  }
+  llvm_unreachable("unreachable path");
+}
+
 } // end anonymous namespace
 
 ErrorOr<uint64_t> SampleProfileLoader::getInstWeight(const Instruction &Inst) {
@@ -1021,8 +1047,9 @@
   for (auto I : Candidates) {
     Function *CalledFunction = I->getCalledFunction();
     if (CalledFunction) {
-      ORE->emit(OptimizationRemarkAnalysis(CSINLINE_DEBUG, "InlineAttempt",
-                                           I->getDebugLoc(), I->getParent())
+      ORE->emit(OptimizationRemarkAnalysis(getAnnotatedRemarkPassName(LTOPhase),
+                                           "InlineAttempt", I->getDebugLoc(),
+                                           I->getParent())
                 << "previous inlining reattempted for "
                 << (Hot ? "hotness: '" : "size: '")
                 << ore::NV("Callee", CalledFunction) << "' into '"
@@ -1241,7 +1268,8 @@
 
   InlineCost Cost = shouldInlineCandidate(Candidate);
   if (Cost.isNever()) {
-    ORE->emit(OptimizationRemarkAnalysis(CSINLINE_DEBUG, "InlineFail", DLoc, BB)
+    ORE->emit(OptimizationRemarkAnalysis(getAnnotatedRemarkPassName(LTOPhase),
+                                         "InlineFail", DLoc, BB)
               << "incompatible inlining");
     return false;
   }
@@ -1259,8 +1287,8 @@
                                              *CalledFunction);
 
   // The call to InlineFunction erases I, so we can't pass it here.
-  emitInlinedIntoBasedOnCost(*ORE, DLoc, BB, *CalledFunction,
-                             *BB->getParent(), Cost, true, CSINLINE_DEBUG);
+  emitInlinedIntoBasedOnCost(*ORE, DLoc, BB, *CalledFunction, *BB->getParent(),
+                             Cost, true, getAnnotatedRemarkPassName(LTOPhase));
 
   // Now populate the list of newly exposed call sites.
   if (InlinedCallSites) {
@@ -1546,8 +1574,9 @@
     if (!Callee || Callee->isDeclaration())
       continue;
 
-    ORE->emit(OptimizationRemarkAnalysis(CSINLINE_DEBUG, "NotInline",
-                                         I->getDebugLoc(), I->getParent())
+    ORE->emit(OptimizationRemarkAnalysis(getAnnotatedRemarkPassName(LTOPhase),
+                                         "NotInline", I->getDebugLoc(),
+                                         I->getParent())
               << "previous inlining not repeated: '"
               << ore::NV("Callee", Callee) << "' into '"
               << ore::NV("Caller", &F) << "'");
diff --git a/llvm/test/Transforms/SampleProfile/pseudo-probe-inline.ll b/llvm/test/Transforms/SampleProfile/pseudo-probe-inline.ll
--- a/llvm/test/Transforms/SampleProfile/pseudo-probe-inline.ll
+++ b/llvm/test/Transforms/SampleProfile/pseudo-probe-inline.ll
@@ -1,9 +1,15 @@
-; RUN: opt < %s -passes=pseudo-probe,sample-profile -sample-profile-file=%S/Inputs/pseudo-probe-inline.prof -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
-; RUN: FileCheck %s -check-prefix=YAML < %t.opt.yaml
+; RUN: opt < %s -passes=pseudo-probe,sample-profile  -sample-profile-file=%S/Inputs/pseudo-probe-inline.prof -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-NO-ANNOTATE < %t.opt.yaml
 
 ; RUN: llvm-profdata merge --sample --extbinary %S/Inputs/pseudo-probe-inline.prof -o %t2
-; RUN: opt < %s -passes=pseudo-probe,sample-profile -sample-profile-file=%t2 -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t2.opt.yaml 2>&1 | FileCheck %s
-; RUN: FileCheck %s -check-prefix=YAML < %t2.opt.yaml
+; RUN: opt < %s -passes=pseudo-probe,sample-profile  -sample-profile-file=%t2 -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t2.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-NO-ANNOTATE < %t2.opt.yaml
+
+; RUN: opt < %s -passes=pseudo-probe,sample-profile -annotate-sample-profile-inline-phase=true -sample-profile-file=%S/Inputs/pseudo-probe-inline.prof -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t3.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-ANNOTATE < %t3.opt.yaml
+
+; RUN: opt < %s -passes=pseudo-probe,sample-profile -annotate-sample-profile-inline-phase=true -sample-profile-file=%t2 -S -pass-remarks=sample-profile -sample-profile-prioritized-inline=0 -pass-remarks-output=%t4.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-ANNOTATE < %t4.opt.yaml
 
 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
@@ -74,7 +80,8 @@
 
 ; Checking to see if YAML file is generated and contains remarks
 ;YAML: --- !Passed
-;YAML-NEXT:  Pass:            sample-profile-inline
+;YAML-NO-ANNOTATE-NEXT:  Pass:            sample-profile-inline
+;YAML-ANNOTATE-NEXT: Pass:    main-sample-profile-inline
 ;YAML-NEXT:  Name:            Inlined
 ;YAML-NEXT:  DebugLoc:        { File: test.cpp, Line: 10, Column: 11 }
 ;YAML-NEXT:  Function:        foo
diff --git a/llvm/test/Transforms/SampleProfile/remarks.ll b/llvm/test/Transforms/SampleProfile/remarks.ll
--- a/llvm/test/Transforms/SampleProfile/remarks.ll
+++ b/llvm/test/Transforms/SampleProfile/remarks.ll
@@ -1,7 +1,12 @@
 ; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
-; RUN: FileCheck %s -check-prefix=YAML < %t.opt.yaml
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-NO-ANNOTATE < %t.opt.yaml
 ; RUN: opt < %s -passes=sample-profile -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
-; RUN: FileCheck %s -check-prefix=YAML < %t.opt.yaml
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-NO-ANNOTATE < %t.opt.yaml
+
+; RUN: opt < %s -sample-profile -annotate-sample-profile-inline-phase -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-ANNOTATE < %t.opt.yaml
+; RUN: opt < %s -passes=sample-profile -annotate-sample-profile-inline-phase -sample-profile-file=%S/Inputs/remarks.prof -S -pass-remarks=sample-profile -pass-remarks-output=%t.opt.yaml 2>&1 | FileCheck %s
+; RUN: FileCheck %s -check-prefixes=YAML,YAML-ANNOTATE < %t.opt.yaml
 
 ; Original test case.
 ;
@@ -32,7 +37,8 @@
 
 ; Checking to see if YAML file is generated and contains remarks
 ;YAML:       --- !Passed
-;YAML-NEXT:  Pass:            sample-profile-inline
+;YAML-NO-ANNOTATE-NEXT:  Pass:            sample-profile-inline
+;YAML-ANNOTATE-NEXT:  Pass:            main-sample-profile-inline
 ;YAML-NEXT:  Name:            Inlined
 ;YAML-NEXT:  DebugLoc:        { File: remarks.cc, Line: 13, Column: 21 }
 ;YAML-NEXT:  Function:        main
@@ -60,7 +66,8 @@
 ;YAML-NEXT:    - String:          ';'
 ;YAML-NEXT:  ...
 ;YAML:       --- !Passed
-;YAML-NEXT:  Pass:            sample-profile-inline
+;YAML-NO-ANNOTATE-NEXT:  Pass:            sample-profile-inline
+;YAML-ANNOTATE-NEXT:  Pass:            main-sample-profile-inline
 ;YAML-NEXT:  Name:            AlwaysInline
 ;YAML-NEXT:  DebugLoc:        { File: remarks.cc, Line: 9, Column: 19 }
 ;YAML-NEXT:  Function:        main