As the architectures tend to add more cores [1][2], that means more memory consumption. In a very near future, we will have 100 cores in a cpu. Assuming we have 4 C-states, that is 100 * 4 * 8 = 3200 bytes of memory used for a single function. IMHO, the kernel shouldn't assume the user must add more memory on the system.
I completely agree.
Anyway, I will post a patchset to use the cpuidle_state per cpu.
Maybe what you were doing wasn't clearly evident with the existing cpuidle core, but once its scaled to add a per cpu state, it might look more meaningful. So if you post your patches to add cpuidle state per cpu, it should certainly give more insight into why this cleanup makes sense.
Thanks -- Daniel [1] http://www.engadget.com/2007/02/11/intel-demonstrates-80-core-processor/ [2] http://www.tilera.com/products/processors/TILE-Gx_Family
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