On 10/07/2013 06:29 AM, Mel Gorman wrote: > From: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > > While parallel applications tend to align their data on the cache > boundary, they tend not to align on the page or THP boundary. > Consequently tasks that partition their data can still "false-share" > pages presenting a problem for optimal NUMA placement. > > This patch uses NUMA hinting faults to chain tasks together into > numa_groups. As well as storing the NID a task was running on when > accessing a page a truncated representation of the faulting PID is > stored. If subsequent faults are from different PIDs it is reasonable > to assume that those two tasks share a page and are candidates for > being grouped together. Note that this patch makes no scheduling > decisions based on the grouping information. > > Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> -- All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>