This patch adds a new 'memrange' file that shows the starting and ending physical addresses that are associated to a node. This is useful for identifying specific DIMMs within the system.
Signed-off-by: Davidlohr Bueso <davidlohr.bu...@hp.com> --- drivers/base/node.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/base/node.c b/drivers/base/node.c index af1a177..f165a0a 100644 --- a/drivers/base/node.c +++ b/drivers/base/node.c @@ -211,6 +211,19 @@ static ssize_t node_read_distance(struct device *dev, } static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); +static ssize_t node_read_memrange(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int nid = dev->id; + unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; + unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; + + return sprintf(buf, "%#010Lx-%#010Lx\n", + (unsigned long long) start_pfn << PAGE_SHIFT, + (unsigned long long) (end_pfn << PAGE_SHIFT) - 1); +} +static DEVICE_ATTR(memrange, S_IRUGO, node_read_memrange, NULL); + #ifdef CONFIG_HUGETLBFS /* * hugetlbfs per node attributes registration interface: @@ -274,6 +287,7 @@ int register_node(struct node *node, int num, struct node *parent) device_create_file(&node->dev, &dev_attr_numastat); device_create_file(&node->dev, &dev_attr_distance); device_create_file(&node->dev, &dev_attr_vmstat); + device_create_file(&node->dev, &dev_attr_memrange); scan_unevictable_register_node(node); @@ -299,6 +313,7 @@ void unregister_node(struct node *node) device_remove_file(&node->dev, &dev_attr_numastat); device_remove_file(&node->dev, &dev_attr_distance); device_remove_file(&node->dev, &dev_attr_vmstat); + device_remove_file(&node->dev, &dev_attr_memrange); scan_unevictable_unregister_node(node); hugetlb_unregister_node(node); /* no-op, if memoryless node */ -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/