Hi, While I'm playing with memory controller of 2.6.23-rc4-mm1, I met following. == [root@drpq test-2.6.23-rc4-mm1]# echo $$ > /opt/mem_control/group_1/tasks [root@drpq test-2.6.23-rc4-mm1]# cat /opt/mem_control/group_1/memory.limit 32768 [root@drpq test-2.6.23-rc4-mm1]# cat /opt/mem_control/group_1/memory.usage 286 // Memory is limited to 512 GiB. try "dd" 1GiB (page size is 16KB) [root@drpq test-2.6.23-rc4-mm1]# dd if=/dev/zero of=/tmp/tmpfile bs=1024 count=1048576 Killed [root@drpq test-2.6.23-rc4-mm1]# ls Killed //above are caused by OOM. [root@drpq test-2.6.23-rc4-mm1]# cat /opt/mem_control/group_1/memory.usage 32763 [root@drpq test-2.6.23-rc4-mm1]# cat /opt/mem_control/group_1/memory.limit 32768 // fully filled by page cache. no reclaim run. == The reason this happens is because I used kernelcore= boot option, i.e ZONE_MOVABLE. Seems try_to_free_mem_container_pages() ignores ZONE_MOVABLE. Quick fix is attached, but Mel's one-zonelist-pernode patch may change this. I'll continue to watch. Thanks, -Kame == Now, there is ZONE_MOVABLE... page cache and user pages are allocated from gfp_zone(GFP_HIGHUSER_MOVABLE) Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> --- mm/vmscan.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) Index: linux-2.6.23-rc4-mm1.bak/mm/vmscan.c =================================================================== --- linux-2.6.23-rc4-mm1.bak.orig/mm/vmscan.c +++ linux-2.6.23-rc4-mm1.bak/mm/vmscan.c @@ -1351,12 +1351,6 @@ unsigned long try_to_free_pages(struct z #ifdef CONFIG_CONTAINER_MEM_CONT -#ifdef CONFIG_HIGHMEM -#define ZONE_USERPAGES ZONE_HIGHMEM -#else -#define ZONE_USERPAGES ZONE_NORMAL -#endif - unsigned long try_to_free_mem_container_pages(struct mem_container *mem_cont) { struct scan_control sc = { @@ -1371,9 +1365,10 @@ unsigned long try_to_free_mem_container_ }; int node; struct zone **zones; + int target_zone = gfp_zone(GFP_HIGHUSER_MOVABLE); for_each_online_node(node) { - zones = NODE_DATA(node)->node_zonelists[ZONE_USERPAGES].zones; + zones = NODE_DATA(node)->node_zonelists[target_zone].zones; if (do_try_to_free_pages(zones, sc.gfp_mask, &sc)) return 1; } _______________________________________________ Containers mailing list Containers@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/containers