On 15.3.2016 2:16, Minchan Kim wrote: > On Mon, Mar 14, 2016 at 09:48:33AM +0100, Vlastimil Babka wrote: >> On 03/11/2016 08:30 AM, Minchan Kim wrote: >> >> Yeah, and compaction (perhaps also other migration users) has to >> drain the lru pvec... Getting rid of this stuff is worth even by >> itself. > > Good note. Although we cannot remove lru pvec draining completely, > at least, this patch removes a case which should drain pvec for > returning freed page to buddy. And this is in fact the only interesting case, right. The migrated page (at its new target) doesn't concern compaction that much, that can go to lru pvec just fine. But we do want the freed buddy pages to merge ASAP. I guess that's the same for CMA, page isolation... -- 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>