Published at LXer:
"Sysrq-p is pretty useless unless you can force the keyboard interrupt and the spinning process onto the same CPU," noted Chuck Ebbert during a discussion centered around debugging tasks stuck in a running state. Pressing the
key combination is used for debugging, dumping the registers and flags from the CPU that handles the keypress interrupt to the console. UltraSPARC maintainer, David Miller, replied, "yes, I find this a painful limitation too,"