> > getcpu system call returns cpu# and node# on which this system call > > and its caller are running. This patch hooks up its implementation on > > IA64. > > I know it's trivial to wire up sys_getcpu, but please take this seriously, > it should be implemented as assembly fsys call. We did look at whether it was worth doing as a fast syscall. How often will applications call getcpu() ... I hope that they aren't doing it hundreds of thousands of times per second (scheduler won't re-assign to a different cpu more often than every few milli-seconds, so it is pointless to call that often). "Slow" syscall is ~1.5us ... which should be in the noise for what I think is the fastest rate at which applications may call it. Do you have some example application scenarios where you believe the rate will be high enough to make a difference? -Tony - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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