On Wed, Jun 10, 2015 at 11:32:33AM +0200, Vlastimil Babka wrote: > The compaction free scanner is looking for PageBuddy() pages and skipping all > others. For large compound pages such as THP or hugetlbfs, we can save a lot > of iterations if we skip them at once using their compound_order(). This is > generally unsafe and we can read a bogus value of order due to a race, but if > we are careful, the only danger is skipping too much. > > When tested with stress-highalloc from mmtests on 4GB system with 1GB > hugetlbfs > pages, the vmstat compact_free_scanned count decreased by at least 15%. > > Signed-off-by: Vlastimil Babka <vba...@suse.cz>
Acked-by: Joonsoo Kim <iamjoonsoo....@lge.com> Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
