Messages in this thread | | | Date | Fri, 7 Dec 2012 15:51:25 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] mm: add node physical memory range to sysfs |
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On Fri, 07 Dec 2012 14:34:56 -0800 Davidlohr Bueso <davidlohr.bueso@hp.com> wrote:
> 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.
I was going to bug you about docmentation, but apparently we didn't document /sys/devices/system/node/node*/. A great labor-saving device, that!
> --- 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;
hm. Is this correct for all for FLATMEM/SPARSEMEM/SPARSEMEM_VMEMMAP/DISCONTIGME/etc?
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