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    SubjectRe: [PATCH] vmscan: prevent background aging of anon page in no swap system
    > > I think both Ying's and Minchan's opnion are right and makes sense.  however I _personally_
    > > like Ying version because 1) this version is simpler 2) swap full is very rarely event 3)
    > > no swap mounting is very common on HPC. so this version could have a chance to
    > > improvement hpc workload too.
    > I agree.
    > >
    > > In the other word, both avoiding unnecessary TLB flush and keeping proper page aging are
    > > performance matter. so when we are talking performance, we always need to think frequency
    > > of the event.
    > Ying's one and mine both has a same effect.
    > Only difference happens swap is full. My version maintains old
    > behavior but Ying's one changes the behavior. I admit swap full is
    > rare event but I hoped not changed old behavior if we doesn't find any
    > problem.
    > If kswapd does aging when swap full happens, is it a problem?
    > We have been used to it from 2.6.28.
    > If we regard a code consistency is more important than _unexpected_
    > result, Okay. I don't mind it. :)

    To be honest, I don't mind the difference between you and Ying's version. because
    _practically_ swap full occur mean the application has a bug. so, proper page aging
    doesn't help so much. That's the reason why I said I prefer simper. I don't have
    strong opinion. I think it's not big matter.

    > But at least we should do more thing to make the patch to compile out
    > for non-swap configurable system.

    Yes, It makes embedded happy :)

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