On Fri, Jul 19, 2013 at 03:59:33PM +0800, Tang Chen wrote: > Arrange hotpluggable memory as ZONE_MOVABLE will cause NUMA performance down > because the kernel cannot use movable memory. For users who don't use memory > hotplug and who don't want to lose their NUMA performance, they need a way to > disable this functionality. So we improved movablecore boot option. > > If users specify the original movablecore=nn@ss boot option, the kernel will > arrange [ss, ss+nn) as ZONE_MOVABLE. The kernelcore=nn@ss boot option is similar > except it specifies ZONE_NORMAL ranges. > > Now, if users specify "movablecore=acpi" in kernel commandline, the kernel will > arrange hotpluggable memory in SRAT as ZONE_MOVABLE. And if users do this, all > the other movablecore=nn@ss and kernelcore=nn@ss options should be ignored. > > For those who don't want this, just specify nothing. The kernel will act as > before. As I wrote before, I find movablecore=acpi rather weird. Shouldn't it be memory_hotplug enable/disable switch instead and movablecore, if specified, overriding information provided by firmware? Thanks. -- tejun -- 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>