On 01/08/2016 03:15 PM, Andy Lutomirski wrote: > + * The guiding principle of this code is that TLB entries that have > + * survived more than a small number of context switches are mostly > + * useless, so we don't try very hard not to evict them. Big ack on that. The original approach tried to keep track of the full 4k worth of possible PCIDs, it also needed an additional cpumask (which it dynamically allocated) for where the PCID was active in addition to the normal "where has this mm been" mask. That's a lot of extra data to mangle, and I can definitely see your approach as being nicer, *IF* the hardware isn't doing something useful with the other 9 bits of PCID that you're throwing away. ;) -- 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>