On Thu, Nov 10, 2011 at 10:06:16AM +0000, Mel Gorman wrote: > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 963c5de..cddc2d0 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -2213,7 +2213,13 @@ rebalance: > sync_migration); > if (page) > goto got_pg; > - sync_migration = true; > + > + /* > + * Do not use sync migration for transparent hugepage allocations as > + * it could stall writing back pages which is far worse than simply > + * failing to promote a page. > + */ > + sync_migration = !(gfp_mask & __GFP_NO_KSWAPD); > > /* Try direct reclaim and then allocating */ > page = __alloc_pages_direct_reclaim(gfp_mask, order, Reviewed-by: Andrea Arcangeli <aarcange@xxxxxxxxxx> -- 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>