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    SubjectRE: [PATCH 0/5] Some vmevent fixes...
    Date
    > -----Original Message-----
    > From: penberg@gmail.com [mailto:penberg@gmail.com] On Behalf Of ext
    > Pekka Enberg
    > Sent: 05 June, 2012 11:02
    > To: Minchan Kim
    ...
    > > Next concern is that periodic timer of implementation.
    > > I think it would add direct hook in vmscan.c rather than peeking raw
    > > vmstat periodically by timer so we can control more fine-grained way
    > without unnecessary overhead.
    >
    > If the hooks are clean and it doesn't hurt the !CONFIG_VMEVENT case, I'm
    > completely OK with that.

    On the previous iteration hooking vm was pointed as very bad idea, so in my version I installed shrinker to handle cases when we have memory pressure.
    Using deferred timer with adequate timeout (0.250 ms or larger) fully suitable for userspace and produce adequate overhead
    -> by nature such API should not be 100% accurate, anyhow applications cannot handle situation as good as kernel can provide, 0.5MB space accuracy, 100ms is maximum user-space require for 64-1024MB devices.


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