diff -uNr systemtap-0.8-old/translate.cxx systemtap-0.8-new/translate.cxx
--- systemtap-0.8-old/translate.cxx	2008-11-13 21:29:23.000000000 +0100
+++ systemtap-0.8-new/translate.cxx	2009-01-26 17:18:05.000000000 +0100
@@ -28,6 +28,10 @@
 #include <elfutils/libdwfl.h>
 }
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
 using namespace std;
 
 struct var;
@@ -4645,12 +4649,39 @@
 void
 emit_symbol_data (systemtap_session& s)
 {
+  /*
   string symfile = "stap-symbols.h";
 
   s.op->newline() << "#include " << lex_cast_qstring (symfile);
 
   ofstream kallsyms_out ((s.tmpdir + "/" + symfile).c_str());
+  */
 
+  string kernel_image = string("/boot/vmlinux-")+s.kernel_release;
+  struct stat stat_kernel_image;
+  stat(kernel_image.c_str(), &stat_kernel_image);
+
+  char last_modification[40];
+  sprintf(last_modification, "%lld", (long long int) stat_kernel_image.st_mtime);
+  
+  string symfile = string("stap-symbols-") + s.kernel_release.c_str() + "-" + string(last_modification) + ".h";
+  
+  string symbols_dir = s.data_path + "/symbols";
+  
+  string symfile_path = symbols_dir + "/" + symfile;
+    
+  s.op->newline() << "#include " << lex_cast_qstring (symfile_path.c_str());
+
+  if(create_dir(symbols_dir.c_str()) == 0) {
+  	struct stat stat_cached_sym;
+
+  	if(stat(symfile_path.c_str(), &stat_cached_sym) == 0) {
+		return;
+	}
+  }
+  
+  ofstream kallsyms_out (symfile_path.c_str());
+  
   unwindsym_dump_context ctx = { s, kallsyms_out, 0, s.unwindsym_modules };
 
   // XXX: copied from tapsets.cxx dwflpp::, sadly