RFC: Not sure if I need locking when accessing task structs from xmon. Please comment.

I found this new xmon command indispensable while debugging a KDUMP problem. It dumps some task information similar to the ps(1) command, plus includes the kernel stack pointer for use with "t" traceback command. In the case of KDUMP on PKVM, it was running single-CPU so locking issues would likely not have shown up. Certainly if xmon runs in an environment where some CPUs are still running tasks, this information can be very fleeting.

Let me know what else needs to be done to make this patch ready.

Thanks,
Doug

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