Re: [PATCH 2/4] slqb: Record what node is local to a kmem_cache_cpu

Christoph Lameter
2009-10-01T15:08:30Z

On Thu, 1 Oct 2009, Mel Gorman wrote:

> True, it might have been improved more if SLUB knew what local hugepage it
> resided within as the kernel portion of the address space is backed by huge
> TLB entries. Note that SLQB could have an advantage here early in boot as
> the page allocator will tend to give it back pages within a single huge TLB
> entry. It loses the advantage when the system has been running for a very long
> time but it might be enough to skew benchmark results on cold-booted systems.

The page allocator serves pages aligned to huge page boundaries as far as
I can remember. You can actually use huge pages in slub if you set the max
order to 9. So a page obtained from the page allocator is always aligned
properly.