atomic-up.h speedup

Hello,

I just ran some tests to see the speedup given by using atomic-up.h on per cpu
variables.

On my 3GHz Pentium 4, it takes 255.83ns to log a 4 bytes event when the LOCK
prefix is used (without atomic-up). When I enable my modified version, it drops
to 205.63ns. Therefore, the speedup is :

(205.63-255.83)/255.83 * 100% = -19.62 %

(Test : 3*20000 loops of 4 bytes event log in flight recorder mode)

Mathieu


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