On Thu, May 13, 2010 at 12:36:12PM +0900, KOSAKI Motohiro wrote: > > The may_swap scan control flag can be naturally merged into the > > swappiness parameter: swap only if swappiness is non-zero. > > Sorry, NAK. > > AFAIK, swappiness==0 is very widely used in MySQL users community. > They expect this parameter mean "very prefer to discard file cache > rather than swap, but not completely disable swap". > > We shouldn't ignore the real world use case. even if it is a bit strange. Bummer. It's really ugly to have 'zero' mean 'almost nothing'. But since swappiness is passed around as an int, I think we can instead use -1 for 'no swap'. Let me look into it and send a follow-up patch for this as well. Thanks! Hannes -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>