lkml.org 
[lkml]   [2013]   [Oct]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 27/63] mm: numa: Scan pages with elevated page_mapcount
    On 10/07/2013 06:29 AM, Mel Gorman wrote:
    > Currently automatic NUMA balancing is unable to distinguish between false
    > shared versus private pages except by ignoring pages with an elevated
    > page_mapcount entirely. This avoids shared pages bouncing between the
    > nodes whose task is using them but that is ignored quite a lot of data.
    >
    > This patch kicks away the training wheels in preparation for adding support
    > for identifying shared/private pages is now in place. The ordering is so
    > that the impact of the shared/private detection can be easily measured. Note
    > that the patch does not migrate shared, file-backed within vmas marked
    > VM_EXEC as these are generally shared library pages. Migrating such pages
    > is not beneficial as there is an expectation they are read-shared between
    > caches and iTLB and iCache pressure is generally low.
    >
    > Signed-off-by: Mel Gorman <mgorman@suse.de>

    Reviewed-by: Rik van Riel <riel@redhat.com>

    --
    All rights reversed


    \
     
     \ /
      Last update: 2013-10-07 21:01    [W:4.441 / U:0.116 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site