diff --git a/chrome/browser/metrics/process_memory_metrics_emitter.cc b/chrome/browser/metrics/process_memory_metrics_emitter.cc
index 394627ac870eae..565db2ead69491 100644
--- a/chrome/browser/metrics/process_memory_metrics_emitter.cc
+++ b/chrome/browser/metrics/process_memory_metrics_emitter.cc
@@ -173,6 +173,8 @@ const Metric kAllocatorDumpNamesForMetrics[] = {
      EmitTo::kSizeInUkmAndUma, &Memory_Experimental::SetDiscardable},
     {"discardable", "Discardable.FreelistSize", MetricSize::kSmall,
      "freelist_size", EmitTo::kSizeInUmaOnly, nullptr},
+    {"discardable", "Discardable.FreelistSize.Dirty", MetricSize::kSmall,
+     "freelist_size_dirty", EmitTo::kSizeInUmaOnly, nullptr},
     {"discardable", "Discardable.ResidentSize", MetricSize::kSmall,
      "resident_size", EmitTo::kSizeInUmaOnly, nullptr},
     {"discardable", "Discardable.VirtualSize", MetricSize::kSmall,
diff --git a/components/discardable_memory/common/discardable_shared_memory_heap.cc b/components/discardable_memory/common/discardable_shared_memory_heap.cc
index 7bd44ad63d7ebb..c6deffd38041ac 100644
--- a/components/discardable_memory/common/discardable_shared_memory_heap.cc
+++ b/components/discardable_memory/common/discardable_shared_memory_heap.cc
@@ -366,6 +366,9 @@ bool DiscardableSharedMemoryHeap::OnMemoryDump(
   total_dump->AddScalar("freelist_size",
                         base::trace_event::MemoryAllocatorDump::kUnitsBytes,
                         freelist_size);
+  total_dump->AddScalar("freelist_size_dirty",
+                        base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+                        dirty_freed_memory_page_count_ * base::GetPageSize());
   if (args.level_of_detail ==
       base::trace_event::MemoryDumpLevelOfDetail::BACKGROUND) {
     // These metrics (size and virtual size) are also reported by each
diff --git a/components/discardable_memory/common/discardable_shared_memory_heap_unittest.cc b/components/discardable_memory/common/discardable_shared_memory_heap_unittest.cc
index 275913449dc944..31ac6cf7715d2e 100644
--- a/components/discardable_memory/common/discardable_shared_memory_heap_unittest.cc
+++ b/components/discardable_memory/common/discardable_shared_memory_heap_unittest.cc
@@ -361,11 +361,14 @@ TEST(DiscardableSharedMemoryHeapTest, OnMemoryDumpTest) {
         "discardable/child_0x%" PRIXPTR, reinterpret_cast<uintptr_t>(&heap)));
     ASSERT_NE(nullptr, dump);
 
-    base::trace_event::MemoryAllocatorDump::Entry freelist("freelist_size",
-                                                           "bytes", 0);
+    base::trace_event::MemoryAllocatorDump::Entry freelist_size("freelist_size",
+                                                                "bytes", 0);
+    base::trace_event::MemoryAllocatorDump::Entry freelist_size_dirty(
+        "freelist_size_dirty", "bytes", 0);
     base::trace_event::MemoryAllocatorDump::Entry virtual_size("virtual_size",
                                                                "bytes", 0);
-    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist))));
+    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist_size))));
+    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist_size_dirty))));
     EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(virtual_size))));
   }
 
@@ -382,11 +385,14 @@ TEST(DiscardableSharedMemoryHeapTest, OnMemoryDumpTest) {
         "discardable/child_0x%" PRIXPTR, reinterpret_cast<uintptr_t>(&heap)));
     ASSERT_NE(nullptr, dump);
 
-    base::trace_event::MemoryAllocatorDump::Entry freelist("freelist_size",
-                                                           "bytes", 0);
+    base::trace_event::MemoryAllocatorDump::Entry freelist_size("freelist_size",
+                                                                "bytes", 0);
+    base::trace_event::MemoryAllocatorDump::Entry freelist_size_dirty(
+        "freelist_size_dirty", "bytes", 0);
     base::trace_event::MemoryAllocatorDump::Entry virtual_size(
         "virtual_size", "bytes", block_size);
-    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist))));
+    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist_size))));
+    EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(freelist_size_dirty))));
     EXPECT_THAT(dump->entries(), Contains(Eq(ByRef(virtual_size))));
   }