From: Matt Mackall <[EMAIL PROTECTED]> Date: Tue, 13 Mar 2007 15:21:25 -0500
> Because the fan-out is large, the bulk of the work is bringing the last > layer of the tree into cache to find all the pages in the address > space. And there's really no way around that. That's right. And I will note that historically we used to be much worse in this area, as we used to walk the page table tree twice on address space teardown (once to hit the PTE entries, once to free the page tables). Happily it is a one-pass algorithm now. But, within active VMA ranges, we do have to walk all the bits at least one time. - 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/
