On 03/01/2018 11:15 PM, Aaron Lu wrote: > >> I am still quite surprised that this would have such a large impact. > Most likely due to the cachelines for these page structures are warmed > up outside of zone->lock. The workload here is a pretty tight microbenchmark and single biggest bottleneck is cache misses on 'struct page'. It's not memory bandwidth bound. So, anything you can give the CPU keep it fed and not waiting on cache misses will be a win. There's never going to be a real-world workload that sees this kind of increase, but the change in the micro isn't super-surprising because it so directly targets the bottleneck. -- 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>
