Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [PATCH 1/4] vmscan: delegate pageout io to flusher thread if current is kswapd | Date | Thu, 15 Apr 2010 20:26:08 +0900 (JST) |
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> 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 ;)
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