diff --git a/be/CMakeLists.txt b/be/CMakeLists.txt
index aed9103ec3..abad57d879 100644
--- a/be/CMakeLists.txt
+++ b/be/CMakeLists.txt
@@ -43,6 +43,14 @@ if (CMAKE_SYSTEM_PROCESSOR MATCHES "^(ppc64le.*|PPC64LE.*)")
     set (ARCH_PPC64LE 1)
 endif ()
 
+if (CMAKE_SYSTEM_NAME MATCHES "Linux")
+    set (OS_LINUX 1)
+    add_definitions(-D OS_LINUX)
+elseif (CMAKE_SYSTEM_NAME MATCHES "Darwin")
+    set (OS_MACOSX 1)
+    add_definitions(-D OS_MACOSX)
+endif ()
+
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     set (COMPILER_GCC 1)
 elseif (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
diff --git a/be/src/vec/common/allocator.h b/be/src/vec/common/allocator.h
index 216864dbb8..0c8cfc6490 100644
--- a/be/src/vec/common/allocator.h
+++ b/be/src/vec/common/allocator.h
@@ -152,6 +152,13 @@ public:
             }
 
             /// No need for zero-fill, because mmap guarantees it.
+
+            if constexpr (mmap_populate) {
+                // MAP_POPULATE seems have no effect for mremap as for mmap,
+                // Clear enlarged memory range explicitly to pre-fault the pages
+                if (new_size > old_size)
+                    memset(reinterpret_cast<char*>(buf) + old_size, 0, new_size - old_size);
+            }
         } else if (new_size < MMAP_THRESHOLD) {
             /// Small allocs that requires a copy. Assume there's enough memory in system. Call CurrentMemoryTracker once.
             // CurrentMemoryTracker::realloc(old_size, new_size);