On Sun, 21 Oct 2007, Jeremy Fitzhardinge wrote: > dean gaudet wrote: > > On Mon, 15 Oct 2007, Nick Piggin wrote: > > > > > >> Yes, as Dave said, vmap (more specifically: vunmap) is very expensive > >> because it generally has to invalidate TLBs on all CPUs. > >> > > > > why is that? ignoring 32-bit archs we have heaps of address space > > available... couldn't the kernel just burn address space and delay global > > TLB invalidate by some relatively long time (say 1 second)? > > > > Yes, that's precisely the problem. xfs does delay the unmap, leaving > stray mappings, which upsets Xen.
sounds like a bug in xen to me :) -dean - 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/