diff --git a/drivers/base/memory.c b/drivers/base/memory.c index d09e52e6cfb6..5e8e268b0cd2 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -435,10 +435,62 @@ out: static DEVICE_ATTR_RO(valid_zones); #endif +#ifdef CONFIG_MEMORY_HOTPLUG +static int count_num_free_block_pages(struct zone *zone, int bid) +{ + int order, type; + unsigned long freecount = 0; + unsigned long flags; + + spin_lock_irqsave(&zone->lock, flags); + for (type = 0; type < MIGRATE_TYPES; type++) { + for (order = 0; order < MAX_ORDER; ++order) { + struct free_area *area; + struct page *page; + + area = &(zone->free_area[order]); + list_for_each_entry(page, &area->free_list[type], lru) { + unsigned long pfn = page_to_pfn(page); + int section_nr = pfn_to_section_nr(pfn); + + if (bid == base_memory_block_id(section_nr)) + freecount += (1 << order); + } + + } + } + spin_unlock_irqrestore(&zone->lock, flags); + + return freecount; +} + +static ssize_t allocated_bytes_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct memory_block *mem = to_memory_block(dev); + int block_id, free_pages; + struct zone *movable_zone = + &NODE_DATA(numa_node_id())->node_zones[ZONE_MOVABLE]; + unsigned long used, block_sz = memory_block_size_bytes(); + + if (mem->state != MEM_ONLINE) + return snprintf(buf, 100, "0\n"); + + block_id = base_memory_block_id(mem->start_section_nr); + free_pages = count_num_free_block_pages(movable_zone, block_id); + used = block_sz - (free_pages * PAGE_SIZE); + + return snprintf(buf, 100, "%lu\n", used); +} +#endif + static DEVICE_ATTR_RO(phys_index); static DEVICE_ATTR_RW(state); static DEVICE_ATTR_RO(phys_device); static DEVICE_ATTR_RO(removable); +#ifdef CONFIG_MEMORY_HOTPLUG +static DEVICE_ATTR_RO(allocated_bytes); +#endif /* * Show the memory block size (shared by all memory blocks). @@ -637,6 +689,9 @@ static struct attribute *memory_memblk_attrs[] = { &dev_attr_removable.attr, #ifdef CONFIG_MEMORY_HOTREMOVE &dev_attr_valid_zones.attr, +#endif +#ifdef CONFIG_MEMORY_HOTPLUG + &dev_attr_allocated_bytes.attr, #endif NULL };