* Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 1 Dec 2009, Tejun Heo wrote: > > > The problem is that on UP configurations. Percpu memory allocator > > becomes a simple wrapper around kmalloc and there's no way to > > specify larger alignment when requesting memory from kmalloc. > > There is usually no point in aligning in UP. Alignment is typically > done for smp configurations to limit cache line bouncing and control > cache line use/ There is a natural minimum alignment for UP and it's smaller than the cache-line size: machine word size. All our allocators (except bootmem) align to machine word so there's no need to specify this explicitly. Larger alignment than that just wastes memory - which waste UP systems can afford the least. Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
