linux-kernel - Re: [RFC PATCH 1/3] mm, numa: rework do_pages

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Message-Id: <2e467ad3-a443-bde4-afa2-664bca57914f@linux.vnet.ibm.com>
Date:   Tue, 2 Jan 2018 16:55:46 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>, linux-mm@...ck.org
Cc:     Zi Yan <zi.yan@...rutgers.edu>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Reale <ar@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH 1/3] mm, numa: rework do_pages_move

On 12/08/2017 09:45 PM, Michal Hocko wrote:
> From: Michal Hocko <mhocko@...e.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);
	}