On Sat, Jul 11, 2015 at 09:25:23PM +0100, David Daney wrote: > From: David Daney <david.da...@cavium.com> > > Most broadcast TLB invalidations are unnecessary. So when > invalidating for a given mm/vma target the only the needed CPUs via > and IPI. > > For global TLB invalidations, also use IPI. > > Tested on Cavium ThunderX. > > This change reduces 'time make -j48' on kernel from 139s to 116s (83% > as long).
Any idea *why* you're seeing such an improvement? Some older kernels had a bug where we'd try to flush a negative (i.e. huge) range by page, so it would be nice to rule that out. I assume these measurements are using mainline? Having TLBI responsible for that amount of a kernel build doesn't feel right to me and doesn't line-up with the profiles I'm used to seeing. You have 16-bit ASIDs, right? Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
