Messages in this thread | | | Subject | Re: [PATCH] mm: show node to memory section relationship with symlinks in sysfs | From | Dave Hansen <> | Date | Tue, 30 Sep 2008 08:50:37 -0700 |
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On Tue, 2008-09-30 at 17:06 +0900, Yasunori Goto wrote: > > +#define section_nr_to_nid(section_nr) pfn_to_nid(section_nr_to_pfn(section_nr)) > > #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ > > If the first page of the section is not valid, then this section_nr_to_nid() > doesn't return correct value. > > I tested this patch. In my box, the start_pfn of node 1 is 1200400, but > section_nr_to_pfn(mem_blk->phys_index) returns 1200000. As a result, > the section is linked to node 0.
Crap, I was worried about that.
Gary, this means that we have a N:1 relationship between NUMA nodes and sections. This normally isn't a problem because sections don't really care about nodes and they layer underneath them.
We'll probably need multiple symlinks in each section directory.
-- Dave
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