lkml.org 
[lkml]   [2007]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 4/6] Have zonelist contains structs with both a zone pointer and zone_idx
    On Fri, 28 Sep 2007, Mel Gorman wrote:

    >
    > Filtering zonelists requires very frequent use of zone_idx(). This is costly
    > as it involves a lookup of another structure and a substraction operation. As
    > the zone_idx is often required, it should be quickly accessible. The node
    > idx could also be stored here if it was found that accessing zone->node is
    > significant which may be the case on workloads where nodemasks are heavily
    > used.
    >
    > This patch introduces a struct zoneref to store a zone pointer and a zone
    > index. The zonelist then consists of an array of this struct zonerefs which
    > are looked up as necessary. Helpers are given for accessing the zone index
    > as well as the node index.
    >
    > [kamezawa.hiroyu@jp.fujitsu.com: Suggested struct zoneref instead of embedding information in pointers]
    > Signed-off-by: Mel Gorman <mel@csn.ul.ie>
    > Acked-by: Christoph Lameter <clameter@sgi.com>

    OOM locking looks good, thanks.

    Acked-by: David Rientjes <rientjes@google.com>
    -
    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: 2007-10-17 05:25    [W:0.030 / U:0.100 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site