Messages in this thread | | | Date | Mon, 07 Oct 2013 14:43:58 -0400 | From | Rik van Riel <> | Subject | Re: [PATCH 27/63] mm: numa: Scan pages with elevated page_mapcount |
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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>
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