linux-kernel - x86 PAE memory mode

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Date:	Fri, 19 Nov 2010 19:05:07 +0800
From:	tingwei liu <tingw.liu@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: x86 PAE memory mode

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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