Re: [PATCH 35/63] sched: numa: Do not trap hinting faults for sharedlibraries

[Rik van Riel]

On 10/07/2013 06:29 AM, Mel Gorman wrote:
> NUMA hinting faults will not migrate a shared executable page mapped by
> multiple processes on the grounds that the data is probably in the CPU
> cache already and the page may just bounce between tasks running on multipl
> nodes. Even if the migration is avoided, there is still the overhead of
> trapping the fault, updating the statistics, making scheduler placement
> decisions based on the information etc. If we are never going to migrate
> the page, it is overhead for no gain and worse a process may be placed on
> a sub-optimal node for shared executable pages. This patch avoids trapping
> faults for shared libraries entirely.
> 
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
-- 
All rights reversed
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/