On Mon, Aug 24, 2015 at 06:47:36PM +0100, Russell King - ARM Linux wrote: > On Mon, Aug 24, 2015 at 05:15:22PM +0300, Andrey Ryabinin wrote: > > Yes, ~130Mb (3G/1G split) should work. 512Mb shadow is optional. > > The only advantage of 512Mb shadow is better handling of user memory > > accesses bugs > > (access to user memory without copy_from_user/copy_to_user/strlen_user etc API). > > No need for that to be handed by KASan. I have patches in linux-next, > now acked by Will, which prevent the kernel accessing userspace with > zero memory footprint. No need for remapping, we have a way to quickly > turn off access to userspace mapped pages on non-LPAE 32-bit CPUs. > (LPAE is not supported yet - Catalin will be working on that using the > hooks I'm providing once he returns.) Hey, I only acked the "Efficiency cleanups" series so far! The PAN emulation is still on my list. Will -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>