On Thu, 2002-06-27 at 00:35, Peter Svensson wrote:
> On 26 Jun 2002, Robert Love wrote:
>
> > Kernel has 4K pages in user and kernel space. It is the same address
> > space and segment, just uses MMU protection.
> >
> > x86 does 4K pages.
>
> The x86 cpus can use 4K or 4M pages in the hardware. The 4M pages are
> restricted to the kernel in Linux due to various problems. This has been
> discussed on this list a while ago. The thread was called "Have the 2.4
> kernel memory management problems on large machines been fixed?" the last
> time around.
>
> 4M pages are useful to minimize tlb misses which can be costly for some
> algorithms.
>
> Peter
In addition to that thread, you might want to read the paper "Multiple
Page Size Support in the Linux Kernel", pages 573-593 in the Proceedings
of the Ottawa Linux Symposium which you can download from here:
http://www.linuxsymposium.org/2002/
If you're on a slow connection, be forewarned that it is a 631 page pdf,
but thankfully it's compressed.
Steven
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