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drivers: base: expose amount allocated per block

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Add a new sysfs node called allocated_bytes to each memory block which
reports the amount of memory currently allocated from that block.

Userspace can then use the allocated_byes node to better evaluate the
potential cost of offlining an individual block since all the allocated
memory in the block will need to be migrated when the block is offlined.

Change-Id: I520de2dd56e4562a65c48e38edb1236a8cbce5fd
Signed-off-by: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Swathi Sridhar <swatsrid@codeaurora.org>
This commit is contained in:
Liam Mark
2018-05-10 11:49:37 -07:00
committed by Swathi Sridhar
parent bdd918fd7e
commit adb178037a
1 changed files with 57 additions and 2 deletions
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59
drivers/base/memory.c
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@@ -109,7 +109,7 @@ static unsigned long get_memory_block_size(void)
* uses.
*/
static ssize_t show_mem_start_phys_index(struct device *dev,
static ssize_t phys_index_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct memory_block *mem = to_memory_block(dev);
@@ -449,10 +449,62 @@ static ssize_t show_valid_zones(struct device *dev,
static DEVICE_ATTR(valid_zones, 0444, show_valid_zones, NULL);
#endif
static DEVICE_ATTR(phys_index, 0444, show_mem_start_phys_index, NULL);
#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 = get_memory_block_size();
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, 0444, phys_index_show, NULL);
static DEVICE_ATTR(state, 0644, show_mem_state, store_mem_state);
static DEVICE_ATTR(phys_device, 0444, show_phys_device, NULL);
static DEVICE_ATTR(removable, 0444, show_mem_removable, NULL);
#ifdef CONFIG_MEMORY_HOTPLUG
static DEVICE_ATTR_RO(allocated_bytes, 0444, allocated_bytes_show, NULL);
#endif
/*
* Block size attribute stuff
@@ -657,6 +709,9 @@ 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
};