diff options
Diffstat (limited to '')
| -rw-r--r-- | mm/memory_hotplug.c | 112 |
1 files changed, 52 insertions, 60 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 7deb49f69e27..9eea6e809a4e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -982,8 +982,6 @@ static void reset_node_present_pages(pg_data_t *pgdat) static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) { struct pglist_data *pgdat; - unsigned long zones_size[MAX_NR_ZONES] = {0}; - unsigned long zholes_size[MAX_NR_ZONES] = {0}; unsigned long start_pfn = PFN_DOWN(start); pgdat = NODE_DATA(nid); @@ -1006,8 +1004,11 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) /* we can use NODE_DATA(nid) from here */ + pgdat->node_id = nid; + pgdat->node_start_pfn = start_pfn; + /* init node's zones as empty zones, we don't have any present pages.*/ - free_area_init_node(nid, zones_size, start_pfn, zholes_size); + free_area_init_core_hotplug(nid); pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); /* @@ -1017,25 +1018,20 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) build_all_zonelists(pgdat); /* - * zone->managed_pages is set to an approximate value in - * free_area_init_core(), which will cause - * /sys/device/system/node/nodeX/meminfo has wrong data. - * So reset it to 0 before any memory is onlined. - */ - reset_node_managed_pages(pgdat); - - /* * When memory is hot-added, all the memory is in offline state. So * clear all zones' present_pages because they will be updated in * online_pages() and offline_pages(). */ + reset_node_managed_pages(pgdat); reset_node_present_pages(pgdat); return pgdat; } -static void rollback_node_hotadd(int nid, pg_data_t *pgdat) +static void rollback_node_hotadd(int nid) { + pg_data_t *pgdat = NODE_DATA(nid); + arch_refresh_nodedata(nid, NULL); free_percpu(pgdat->per_cpu_nodestats); arch_free_nodedata(pgdat); @@ -1046,28 +1042,48 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat) /** * try_online_node - online a node if offlined * @nid: the node ID - * + * @start: start addr of the node + * @set_node_online: Whether we want to online the node * called by cpu_up() to online a node without onlined memory. + * + * Returns: + * 1 -> a new node has been allocated + * 0 -> the node is already online + * -ENOMEM -> the node could not be allocated */ -int try_online_node(int nid) +static int __try_online_node(int nid, u64 start, bool set_node_online) { - pg_data_t *pgdat; - int ret; + pg_data_t *pgdat; + int ret = 1; if (node_online(nid)) return 0; - mem_hotplug_begin(); - pgdat = hotadd_new_pgdat(nid, 0); + pgdat = hotadd_new_pgdat(nid, start); if (!pgdat) { pr_err("Cannot online node %d due to NULL pgdat\n", nid); ret = -ENOMEM; goto out; } - node_set_online(nid); - ret = register_one_node(nid); - BUG_ON(ret); + + if (set_node_online) { + node_set_online(nid); + ret = register_one_node(nid); + BUG_ON(ret); + } out: + return ret; +} + +/* + * Users of this function always want to online/register the node + */ +int try_online_node(int nid) +{ + int ret; + + mem_hotplug_begin(); + ret = __try_online_node(nid, 0, true); mem_hotplug_done(); return ret; } @@ -1099,9 +1115,7 @@ static int online_memory_block(struct memory_block *mem, void *arg) int __ref add_memory_resource(int nid, struct resource *res, bool online) { u64 start, size; - pg_data_t *pgdat = NULL; - bool new_pgdat; - bool new_node; + bool new_node = false; int ret; start = res->start; @@ -1111,11 +1125,6 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online) if (ret) return ret; - { /* Stupid hack to suppress address-never-null warning */ - void *p = NODE_DATA(nid); - new_pgdat = !p; - } - mem_hotplug_begin(); /* @@ -1126,48 +1135,31 @@ int __ref add_memory_resource(int nid, struct resource *res, bool online) */ memblock_add_node(start, size, nid); - new_node = !node_online(nid); - if (new_node) { - pgdat = hotadd_new_pgdat(nid, start); - ret = -ENOMEM; - if (!pgdat) - goto error; - } + ret = __try_online_node(nid, start, false); + if (ret < 0) + goto error; + new_node = ret; /* call arch's memory hotadd */ ret = arch_add_memory(nid, start, size, NULL, true); - if (ret < 0) goto error; - /* we online node here. we can't roll back from here. */ - node_set_online(nid); - if (new_node) { - unsigned long start_pfn = start >> PAGE_SHIFT; - unsigned long nr_pages = size >> PAGE_SHIFT; - - ret = __register_one_node(nid); - if (ret) - goto register_fail; - - /* - * link memory sections under this node. This is already - * done when creatig memory section in register_new_memory - * but that depends to have the node registered so offline - * nodes have to go through register_node. - * TODO clean up this mess. - */ - ret = link_mem_sections(nid, start_pfn, nr_pages, false); -register_fail: - /* - * If sysfs file of new node can't create, cpu on the node + /* If sysfs file of new node can't be created, cpu on the node * can't be hot-added. There is no rollback way now. * So, check by BUG_ON() to catch it reluctantly.. + * We online node here. We can't roll back from here. */ + node_set_online(nid); + ret = __register_one_node(nid); BUG_ON(ret); } + /* link memory sections under this node.*/ + ret = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1)); + BUG_ON(ret); + /* create new memmap entry */ firmware_map_add_hotplug(start, start + size, "System RAM"); @@ -1180,8 +1172,8 @@ register_fail: error: /* rollback pgdat allocation and others */ - if (new_pgdat && pgdat) - rollback_node_hotadd(nid, pgdat); + if (new_node) + rollback_node_hotadd(nid); memblock_remove(start, size); out: |