--- ../new/mysql-8.0.31/sql/sys_vars.cc	2022-09-14 00:15:16.000000000 +0800
+++ sql/sys_vars.cc	2023-03-25 02:57:44.094219430 +0800
@@ -151,6 +151,11 @@
 #include "storage/perfschema/pfs_server.h"
 #include "storage/perfschema/terminology_use_previous.h"
 #endif /* WITH_PERFSCHEMA_STORAGE_ENGINE */
+#include <stddef.h>
+#include <m_string.h>
+#include <dlfcn.h>
+
+
 
 static constexpr const unsigned long DEFAULT_ERROR_COUNT{1024};
 static constexpr const unsigned long DEFAULT_SORT_MEMORY{256UL * 1024UL};
@@ -5252,6 +5257,41 @@
   return false;
 }
 
+
+typedef const char* (*tc_version_type)(int*, int*, const char**);
+typedef int (*mallctl_type)(const char*, void*, size_t*, void*, size_t);
+
+char *get_malloc_library()
+{
+  tc_version_type tc_version_func;
+  mallctl_type mallctl_func;
+  static char buf[128];
+
+  /* tcmalloc */
+  tc_version_func= (tc_version_type) dlsym(RTLD_DEFAULT, "tc_version");
+  if (tc_version_func)
+  {
+    int major, minor;
+    const char* ver_str = tc_version_func(&major, &minor, NULL);
+    strxnmov(buf, sizeof(buf)-1, "tcmalloc ", ver_str, NULL);
+    return buf;
+  }
+
+  /* jemalloc */
+  mallctl_func= (mallctl_type) dlsym(RTLD_DEFAULT, "mallctl");
+  if (mallctl_func)
+  {
+    char *ver;
+    size_t len = sizeof(ver);
+    mallctl_func("version", &ver, &len, NULL, 0);
+    strxnmov(buf, sizeof(buf)-1, "jemalloc ", ver, NULL);
+    return buf;
+  }
+
+  return (char*) "system";
+}
+
+
 static Sys_var_transaction_read_only Sys_transaction_read_only(
     "transaction_read_only",
     "Set default transaction access mode to read only.",
@@ -5274,6 +5314,13 @@
     READ_ONLY NON_PERSIST GLOBAL_VAR(server_version_ptr), NO_CMD_LINE,
     IN_SYSTEM_CHARSET, DEFAULT(server_version));
 
+static char *malloc_library;
+static Sys_var_version Sys_malloc_library(
+    "malloc_library", "Version of the used malloc library",
+    READ_ONLY GLOBAL_VAR(malloc_library),NO_CMD_LINE,IN_SYSTEM_CHARSET,
+    DEFAULT(get_malloc_library()));
+
+
 static char *server_version_comment_ptr;
 static Sys_var_charptr Sys_version_comment(
     "version_comment", "version_comment",