On Thu, 6 Sep 2012, wujianguo wrote: > From: Jianguo Wu <wujianguo@xxxxxxxxxx> > > In arch ia64, has following definition: > extern u8 numa_slit[MAX_NUMNODES * MAX_NUMNODES]; > #define node_distance(from,to) (numa_slit[(from) * num_online_nodes() + (to)]) > > num_online_nodes() is a variable value, it can be changed after hot-remove/add > a node. > > I my practice, I found node distance is wrong after offline > a node in IA64 platform. For example system has 4 nodes: > node distances: > node 0 1 2 3 > 0: 10 21 21 32 > 1: 21 10 32 21 > 2: 21 32 10 21 > 3: 32 21 21 10 > > linux-drf:/sys/devices/system/node/node0 # cat distance > 10 21 21 32 > linux-drf:/sys/devices/system/node/node1 # cat distance > 21 10 32 21 > > After offline node2: > linux-drf:/sys/devices/system/node/node0 # cat distance > 10 21 32 > linux-drf:/sys/devices/system/node/node1 # cat distance > 32 21 32 --------->expected value is: 21 10 21 > > > Signed-off-by: Jianguo Wu <wujianguo@xxxxxxxxxx> > Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> -- 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>