lkml.org 
[lkml]   [2007]   [May]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] mm: swap prefetch improvements

    * Con Kolivas <kernel@kolivas.org> wrote:

    > > A suggestion for improvement: right now swap-prefetch does a small
    > > bit of swapin every 5 seconds and stays idle inbetween. Could this
    > > perhaps be made more agressive (optionally perhaps), if the system
    > > is not swapping otherwise? If block-IO level instrumentation is
    > > needed to determine idleness of block IO then that is justified too
    > > i think.
    >
    > Hmm.. The timer waits 5 seconds before trying to prefetch, but then
    > only stops if it detects any activity elsewhere. It doesn't actually
    > try to go idle in between but it doesn't take much activity to put it
    > back to sleep, hence detecting yet another "not quite idle" period and
    > then it goes to sleep again. I guess the sleep interval can actually
    > be changed as another tunable from 5 seconds to whatever the user
    > wanted.

    there was nothing else running on the system - so i suspect the swapin
    activity flagged 'itself' as some 'other' activity and stopped? The
    swapins happened in 4 bursts, separated by 5 seconds total idleness.

    Ingo
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-21 18:05    [W:0.023 / U:126.904 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site