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    SubjectRe: [PATCH 1/4] vmscan: delegate pageout io to flusher thread if current is kswapd
    > 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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