Performance counter and NMI handling

Jugwan Eom zugwan at
Wed Nov 15 07:25:11 CET 2006


I'm working to implement the Linux Oprofile functionality on L4/Fiasco 
OProfile configures the performance counter to raise a NMI whenever the 
counter overflows. I modified the NMI handling codes in 
handle_slow_trap() to collect samples but I encountered an strange 
system behavior, REBOOTING without any information. If there is no user 
application activity, the system looks fine. Otherwise, the system 
reboots even if a very simple application like hello runs and the 
required time before reboot varies.
I don't know what causes this behavior. IMHO, it seems a kind of triple 
fault. Is there any one give me an advice?

Thanks in advance.
 Jugwan Eom

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