From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> If system can create movable node which all memory of the node is allocated as ZONE_MOVABLE, setup_node_data() cannot allocate memory for the node's pg_data_t. So, use memblock_alloc_try_nid() instead of memblock_alloc_nid() to retry when the first allocation fails. Otherwise, the system could failed to boot. The node_data could be on hotpluggable node. And so could pagetable and vmemmap. But for now, doing so will break memory hot-remove path. A node could have several memory devices. And the device who holds node data should be hot-removed in the last place. But in NUMA level, we don't know which memory_block (/sys/devices/system/node/nodeX/memoryXXX) belongs to which memory device. We only have node. So we can only do node hotplug. But in virtualization, developers are now developing memory hotplug in qemu, which support a single memory device hotplug. So a whole node hotplug will not satisfy virtualization users. So at last, we concluded that we'd better do memory hotplug and local node things (local node node data, pagetable, vmemmap, ...) in two steps. Please refer to https://lkml.org/lkml/2013/6/19/73 For now, we put node_data of movable node to another node, and then improve it in the future. In the later patches, a boot option will be introduced to enable/disable this functionality. If users disable it, the node_data will still be put on the local node. Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx> Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx> Reviewed-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> Reviewed-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx> Acked-by: Toshi Kani <toshi.kani@xxxxxx> --- arch/x86/mm/numa.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c index 8bf93ba..d532b6d 100644 --- a/arch/x86/mm/numa.c +++ b/arch/x86/mm/numa.c @@ -209,10 +209,9 @@ static void __init setup_node_data(int nid, u64 start, u64 end) * Allocate node data. Try node-local memory and then any node. * Never allocate in DMA zone. */ - nd_pa = memblock_alloc_nid(nd_size, SMP_CACHE_BYTES, nid); + nd_pa = memblock_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); if (!nd_pa) { - pr_err("Cannot find %zu bytes in node %d\n", - nd_size, nid); + pr_err("Cannot find %zu bytes in any node\n", nd_size); return; } nd = __va(nd_pa); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
