Re: [PATCH v2] X86-32: Allocate 256 bytes for pgd in PAE paging

[Christoph Lameter]

On Wed, 17 Dec 2014, Dave Hansen wrote:

> IOW, do *ALL* of the sl*b allocators in all of their forms with all of
> their debugging options guarantee 32-byte alignment when allocating
> 256-byte objects?

No. For that the arch has to set a macro call ARCH_KMALLOC_MINALIGN or
ARCH_DMA_MINALIGN. Default alignment is to a word boundary.

> I know we at least try to align to a cacheline, which would be good
> enough, but I'm fuzzy on what we *guarantee*.

Sorry we only do this if requested for a slab cache.

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