lkml.org 
[lkml]   [2009]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 4/4] zone_reclaim_mode is always 0 by default

    sorry I missed this mail

    > > > Even with 128 nodes and 256 cpus, I _NEVER_ see the
    > > > system swapping out before allocating off node so I can certainly not
    > > > reproduce the situation you are seeing.
    > >
    > > hmhm. but I don't think we can assume hpc workload.
    >
    > System swapping due to zone reclaim? zone reclaim only reclaims unmapped
    > pages so it will not swap. Maybe some bug crept in in the recent changes?
    > Or you overrode the defaults for zone reclaim?

    I guess he use zone_reclaim_mode=7 or similar.

    However, I have to explain recent zone reclaim change. current zone reclaim is

    1. zone reclaim can make high order reclaim (by hanns)
    2. determine file-backed page by get_scan_ratio

    it mean, high order allocation makes lumpy zone reclaim. and shrink_inactive_list()
    don't care may_swap. then, zone_reclaim_mode=1 can makes swap-out if your
    driver makes high order allocation request.





    \
     
     \ /
      Last update: 2009-05-24 15:49    [W:2.366 / U:0.072 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site