I've been looking at the probe points for sysinfo:::xcalls and I'm 
wondering if the point for xc_capture_cpus() is correct.

There's two points for this probe on x86, in xc_capture_cpus() and 
xc_common(). The latter fires syinfo:::xcalls for each invocation of 
send_dirint(). But xc_capture_cpus() fires only once early in the 
function and doesn't account for possible multiple calls of 
send_dirint(). Which seems incorrect to me.

Does this make sense or am I missing something ?

Thanks,
Rafael
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