x86 PAE memory mode

[tingwei liu]

If I open PAE mode on X86_32 platform,the efficiency of mmu will be lower?
Another question:
Why the kernel  doesn't  use  the flag "GFP_HIGHMEM"  to get memory
while it can't get memory by using flag "GFP_KERNEL",on the contrary,
the kernel get memory from killing process ?

Your response is pleasure.
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