Re: Kernel vs user memory

sidc7
2009-01-17T06:34:37Z

If I am not mistaken, Linux kernel is a high memory kernel, hence for Linux
kernel, nothing will be mapped to the kernel space, other than the memory
beyond 896MB which is the kernel's virtual address space. Am I right on
this?

Thanks

H. Peter Anvin wrote:
>
> sidc7 wrote:
>> The kernel maintains a free list of pages that are free in physical
>> memory. I
>> was wondering, are these pages in the kernel space ? They are not mapped
>> to
>> any of the user address space for sure, so will they be in the kernel
>> memory
>> ?
>
> On a non-highmem kernel, they will be -- ALL memory is mapped in kernel
> space on non-highmem kernels. For highmem kernels, they will generally
> not be mapped at all, unless they are lowmem pages.
>
> -hpa
>
> --
> H. Peter Anvin, Intel Open Source Technology Center
> I work for Intel. I don't speak on their behalf.
>
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