Re: [PATCH] mm/device-public-memory: Enable move_pages() to stat device memory

[Reza Arbab <arbab@linux.vnet.ibm.com>]

On Fri, Sep 22, 2017 at 08:31:57PM +0000, Reza Arbab wrote:
>On Fri, Sep 22, 2017 at 08:13:56PM +0000, Reza Arbab wrote:
>>The move_pages() syscall can be used to find the numa node where a page
>>currently resides. This is not working for device public memory pages,
>>which erroneously report -EFAULT (unmapped or zero page).
>
>Argh. Please disregard this patch.
>
>My test setup has a chunk of system memory carved out as pretend 
>device public memory, to experiment with. Of course the real thing has 
>no numa node!

On third thought, yes it does! 

static int hmm_devmem_pages_create(struct hmm_devmem *devmem)
{
	:
	nid = dev_to_node(device);
	if (nid < 0)
		nid = numa_mem_id();
	:
	if (devmem->pagemap.type == MEMORY_DEVICE_PUBLIC)
		ret = arch_add_memory(nid, align_start, align_size, false);
	:
}

So now I think the patch may be right after all. Please un-disregard it.  
Regard it? Whatever.

-- 
Reza Arbab

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