On 11/12/2011 11:37 AM, Minchan Kim wrote:
Now compaction doesn't handle mlocked page as it uses __isolate_lru_page which doesn't consider unevicatable page. It has been used by just lumpy so it was pointless that it isolates unevictable page. But the situation is changed. Compaction could handle unevictable page and it can help getting big contiguos pages in fragment memory by many pinned page with mlock. I tested this patch with following scenario. 1. A : allocate 80% anon pages in system 2. B : allocate 20% mlocked page in system /* Maybe, mlocked pages are located in low pfn address */ 3. kill A /* high pfn address are free */ 4. echo 1> /proc/sys/vm/compact_memory old: compact_blocks_moved 251 compact_pages_moved 44 new: compact_blocks_moved 258 compact_pages_moved 412 CC: Mel Gorman<mgorman@xxxxxxx> CC: Johannes Weiner<jweiner@xxxxxxxxxx> CC: Rik van Riel<riel@xxxxxxxxxx> Signed-off-by: Minchan Kim<minchan.kim@xxxxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx> -- All rights reversed -- 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>