If the allocation order is not high, direct compaction does nothing. Can we skip compaction here if order drops to zero?
--- a/mm/vmscan.c Thu Aug 15 17:47:26 2013 +++ b/mm/vmscan.c Thu Aug 15 17:48:58 2013 @@ -3034,7 +3034,7 @@ static unsigned long balance_pgdat(pg_da * Compact if necessary and kswapd is reclaiming at least the * high watermark number of pages as requsted */ - if (pgdat_needs_compaction && sc.nr_reclaimed > nr_attempted) + if (pgdat_needs_compaction && sc.nr_reclaimed > nr_attempted && order) compact_pgdat(pgdat, order); /* -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
