Re: [RFC PATCH 1/3] mm, numa: rework do_pages_move

[Anshuman Khandual <khandual@linux.vnet.ibm.com>]

On 12/08/2017 09:45 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@suse.com>
> 
> do_pages_move is supposed to move user defined memory (an array of
> addresses) to the user defined numa nodes (an array of nodes one for
> each address). The user provided status array then contains resulting
> numa node for each address or an error. The semantic of this function is
> little bit confusing because only some errors are reported back. Notably
> migrate_pages error is only reported via the return value. This patch

It does report back the migration failures as well. In new_page_node
there is '*result = &pm->status' which going forward in unmap_and_move
will hold migration error or node ID of the new page.

	newpage = get_new_page(page, private, &result);
	............
	if (result) {
		if (rc)
			*result = rc;
		else
			*result = page_to_nid(newpage);
	}

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