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    SubjectRe: Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers
    * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> [2010-09-16 19:01:32]:

    > + if (!(zone_reclaim_mode & RECLAIM_CACHE) &&
    > + (gfp_mask & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK) {
    > + inc_zone_state(zone, NR_ZONE_CACHE_AVOID);
    > + goto try_next_zone;
    > + }
    > +

    Interesting approach, so for page cache related applications we expect
    RECLAIM_CACHE to be set and hence zone_reclaim to occur. I have
    another variation, a new gfp flag called __GFP_FREE_CACHE. You can
    find the patches at

    http://lwn.net/Articles/391293/
    http://article.gmane.org/gmane.linux.kernel.mm/49155

    --
    Three Cheers,
    Balbir


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