> i.e. like the patch below. Boot-tested on x86. x86, x64 and ia64 have a > real kernel_stack() implementation, the other architectures all return > 'next'. (I've also cleaned up a couple of other things in the > prefetch-next area, see the changelog below.) > > Ken, would this patch generate a sufficient amount of prefetching on > ia64?
Sorry, this is not enough. Switch stack on ia64 is 528 bytes. We need to prefetch 5 lines. It probably should use prefetch_range(). But on ia64, prefetch_range stride L1_CACHE_BYTES, where I really want to stride L3 cache line size. We also want to prefetch switch stack for current task, since processor state is saved onto the stack for outgoing process. And that stack is almost guaranteed to be cold because switch stack is created below current stack pointer. Can we just go back to prefetch_stack() or prefetch_task() (or use plural name) and let each arch decide what to do with it? - Ken - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
