I think it also can mean that there is a 1-1 mapping in the kernel(except for high mem) as there cannot be any page-faults in the kernel. So for memory allocated in kernel, a physical memory mapping exists, thus lessening the available physical memory.

On 6 September 2011 17:48, Vijay Chauhan <kernel.vijay@gmail.com> wrote:

Hi,

i was going through the Linux Kernel Development book. It mention the following:

"Additionally, kernel memory is not pageable.Therefore, every byte of
memory you consume is one less byte of available physical memory."

What is the meaning of 'Kernel memory is not pageable'? Anyone can
give details would help me in understanding.

Thanks,
Vijay

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