On Thu, Jun 09, 2016 at 10:01:07AM +0900, Minchan Kim wrote: > A system has big HDD storage and SSD swap. > > HDD: 200 IOPS > SSD: 100000 IOPS > From https://en.wikipedia.org/wiki/IOPS > > So, speed gap is 500x. > x + 500x = 200 > If we use PCIe-SSD, the gap will be larger. > That's why I said 200 is enough to represent speed gap. Ah, I see what you're saying. Yeah, that's unfortunately a limitation in the current ABI. Extending the range to previously unavailable settings is doable; changing the meaning of existing values is not. We'd have to add another interface. > Such system configuration is already non-sense so it is okay to ignore such > usecases? I'm not sure we have to be proactive about it, but we can always add a more fine-grained knob to override swappiness when somebody wants to use such a setup in practice. -- 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>