On Thu, Nov 10, 2011 at 03:37:32PM -0800, David Rientjes wrote: > On Thu, 10 Nov 2011, Andrew Morton wrote: > > > > This patch once again prevents sync migration for transparent > > > hugepage allocations as it is preferable to fail a THP allocation > > > than stall. > > > > Who said? ;) Presumably some people would prefer to get lots of > > huge pages for their 1000-hour compute job, and waiting a bit to get > > those pages is acceptable. > > > > Indeed. It seems like the behavior would better be controlled with > /sys/kernel/mm/transparent_hugepage/defrag which is set aside specifically > to control defragmentation for transparent hugepages and for that > synchronous compaction should certainly apply. With khugepaged in place, it's adding a tunable that is unnecessary and will not be used. Even if such a tuneable was created, the default behaviour should be "do not stall". -- Mel Gorman SUSE Labs -- 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>