> On Thu, Apr 15, 2010 at 01:11:37PM +0900, KOSAKI Motohiro wrote: > > Now, vmscan pageout() is one of IO throuput degression source. > > Some IO workload makes very much order-0 allocation and reclaim > > and pageout's 4K IOs are making annoying lots seeks. > > > > At least, kswapd can avoid such pageout() because kswapd don't > > need to consider OOM-Killer situation. that's no risk. > > > > Well, there is some risk here. Direct reclaimers may not be cleaning > more pages than it had to previously except it splices subsystems > together increasing stack usage and causing further problems. > > It might not cause OOM-killer issues but it could increase the time > dirty pages spend on the LRU. > > Am I missing something? No. you are right. I fully agree your previous mail. so, I need to cool down a bit ;) -- 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>