diff -up mysql-5.5.24/configure.cmake.notify mysql-5.5.24/configure.cmake
--- mysql-5.5.24/configure.cmake.notify	2012-07-04 12:24:40.927124701 +0200
+++ mysql-5.5.24/configure.cmake	2012-07-04 12:28:24.665302589 +0200
@@ -257,6 +257,7 @@ CHECK_INCLUDE_FILES ("stdlib.h;sys/un.h"
 CHECK_INCLUDE_FILES (vis.h HAVE_VIS_H)
 CHECK_INCLUDE_FILES (wchar.h HAVE_WCHAR_H)
 CHECK_INCLUDE_FILES (wctype.h HAVE_WCTYPE_H)
+CHECK_INCLUDE_FILES (systemd/sd-daemon.h HAVE_SYSTEMD_SD_DAEMON_H)
 
 IF(HAVE_SYS_STREAM_H)
   # Needs sys/stream.h on Solaris
diff -up mysql-5.5.24/sql/CMakeLists.txt.notify mysql-5.5.24/sql/CMakeLists.txt
--- mysql-5.5.24/sql/CMakeLists.txt.notify	2012-07-04 12:47:37.994826990 +0200
+++ mysql-5.5.24/sql/CMakeLists.txt	2012-07-04 12:50:33.988626765 +0200
@@ -157,6 +157,11 @@ IF(INTERFACE_LIBS)
   "${INTERFACE_LIBS}")
 ENDIF()
 
+# Used for notify systemd's feature
+IF(HAVE_SYSTEMD_SD_DAEMON_H)
+  TARGET_LINK_LIBRARIES(mysqld systemd-daemon)
+ENDIF()
+
 # On Solaris, some extra effort is required in order to get dtrace probes
 # from static libraries
 DTRACE_INSTRUMENT_STATIC_LIBS(mysqld 
diff -up mysql-5.5.24/sql/mysqld.cc.notify mysql-5.5.24/sql/mysqld.cc
--- mysql-5.5.24/sql/mysqld.cc.notify	2012-07-04 12:23:05.336331753 +0200
+++ mysql-5.5.24/sql/mysqld.cc	2012-07-04 12:32:04.768529924 +0200
@@ -96,6 +96,10 @@
 #include <poll.h>
 #endif
 
+#ifdef HAVE_SYSTEMD_SD_DAEMON_H
+#include <systemd/sd-daemon.h>
+#endif
+
 #define mysqld_charset &my_charset_latin1
 
 /* We have HAVE_purify below as this speeds up the shutdown of MySQL */
@@ -5163,6 +5167,11 @@ void handle_connections_sockets()
 #endif
 #endif
 
+#ifdef HAVE_SYSTEMD_SD_DAEMON_H
+  sd_notify(0, "READY=1\n"
+               "STATUS=Processing requests...");
+#endif
+
   DBUG_PRINT("general",("Waiting for connections."));
   MAYBE_BROKEN_SYSCALL;
   while (!abort_loop)