cannot trace cpu_idle

[you_bear zhou]

Hei guys,

I'm running a para-virtualized Suse VM on Xen 3.2.0.  I use printk to
print out some message within cpu_idle() function
(arch/x86/kernel/process_32.c), from the hypervisor's record the VM is
already idle for a while, but I didn't see any message print out from
cpu_idle().

Can anyone explain this to me?

Thank you!
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