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Hello,

I've been hacking the SPARCbook again, this time I figured out how to
put the CPU to sleep to cool down / save power. So I added another
function pointer to struct cpu_info and hacked locore.s to call it when
idle.
The problem - the idle loop contains code to call uvm_pageidlezero()
under certain circumstances, but we can have only one thing - a sleeping
CPU or one that zeroes idle pages, not both. Since macppc does a similar
thing on some CPUs ( notably G3s ) I had a look at this code and found
that apparently no powerpc port ever calls uvm_pageidlezero. Arm and
m68k don't use it either.

So - is it really necessary to run uvm_pageidlezero in the idle loop?
Should I call it when CPU sleep mode isn't available or disabled?=20

have fun
Michael

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