On Wed, 5 Jun 2013, KOSAKI Motohiro wrote: > > There was early on an issue with multiple zone reclaims from > > different processors causing an extreme slowdown and the system would go > > OOM. The flag was used to enforce that only a single zone reclaim pass was > > occurring at one time on a zone. This minimized contention and avoided > > the failure. > > OK. I've convinced now we can removed because sc->nr_to_reclaim protect us > form > this issue. How does nr_to_reclaim limit the concurrency of zone reclaim? What happens if multiple processes are allocating from the same zone and they all go into direct reclaim and therefore hit zone reclaim? -- 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>