On Wed, 22 Jun 2016 15:06:29 -0700 (PDT) David Rientjes <rientjes@xxxxxxxxxx> wrote: > On Wed, 22 Jun 2016, Andrew Morton wrote: > > > On Tue, 21 Jun 2016 18:22:49 -0700 (PDT) David Rientjes <rientjes@xxxxxxxxxx> wrote: > > > > > If the memory compaction free scanner cannot successfully split a free > > > page (only possible due to per-zone low watermark), terminate the free > > > scanner rather than continuing to scan memory needlessly. If the > > > watermark is insufficient for a free page of order <= cc->order, then > > > terminate the scanner since all future splits will also likely fail. > > > > > > This prevents the compaction freeing scanner from scanning all memory on > > > very large zones (very noticeable for zones > 128GB, for instance) when > > > all splits will likely fail while holding zone->lock. > > > > > > > This collides pretty heavily with Joonsoo's "mm/compaction: split > > freepages without holding the zone lock". > > > > Sorry if it wasn't clear, but I was proposing this patch for 4.7 > inclusion and Vlastimil agreed we should ask for that. Joonsoo said he > was prepared to rebase on top of that. Is > mm-compaction-split-freepages-without-holding-the-zone-lock.patch and > friends going into 4.7 or are we deferring this fix until 4.8? I have this patch lined up for 4.7 so I was rebasing Joonsoo's patches on top. -- 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>