On Thu, 25 Mar 2010 09:48:26 +0000 Mel Gorman <mel@xxxxxxxxx> wrote: > > In that case, compact_finished() can't > > find there is a free chunk and do more work. How about using a function like > > free_pcppages_bulk(zone, pcp->batch, pcp); > > to bypass pcp list and freeing pages at once ? > > > > I think you mean to drain the PCP lists while compaction is happening > but is it justified? It's potentially a lot of IPI calls just to check > if compaction can finish a little earlier. If the pages on the PCP lists > are making that much of a difference to high-order page availability, it > implies that the zone is pretty full and it's likely that compaction was > avoided and we direct reclaimed. > Ah, sorry for my short word again. I mean draining "local" pcp list because a thread which run direct-compaction freed pages. IPI is not necessary and overkill. Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>