On Mon, Nov 21, 2011 at 06:36:47PM +0000, Mel Gorman wrote: > If compaction is deferred, we enter direct reclaim to try reclaim the > pages that way. For small high-orders, this has a reasonable chance > of success. However, if the caller as specified __GFP_NO_KSWAPD to > limit the disruption to the system, it makes more sense to fail the > allocation rather than stall the caller in direct reclaim. This patch > will skip direct reclaim if compaction is deferred and the caller > specifies __GFP_NO_KSWAPD. > > Async compaction only considers a subset of pages so it is possible for > compaction to be deferred prematurely and not enter direct reclaim even > in cases where it should. To compensate for this, this patch also defers > compaction only if sync compaction failed. > > Signed-off-by: Mel Gorman <mgorman@xxxxxxx> Acked-by: Minchan Kim <minchan.kim@xxxxxxxxx> It does make sense to me. -- Kind regards, Minchan Kim -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>