And my computer use Ubuntu12.04,Intel core i3 CPU.
     I have read one email in LKML,it says:

"The patch also adds a bunch of interfaces under
/sys/devices/system/cpu/cpuX/cache, showing various information about the
caches.  Most useful field being shared_cpu_map, which says what caches are
shared among which logical cpus. "

     But I still cannot catch the meaning of  'which says what caches
are shared among which logical cpus'.
     Thanks.  
--