linux-kernel - Re: [PATCH v2 05/12] mm: thp: add core routines for thp/pmd migration

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Date:   Tue, 29 Nov 2016 07:57:58 +0000
From:   Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:     Michal Hocko <mhocko@...nel.org>
CC:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Pavel Emelyanov" <xemul@...allels.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Balbir Singh <bsingharora@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v2 05/12] mm: thp: add core routines for thp/pmd
 migration

On Mon, Nov 28, 2016 at 03:31:32PM +0100, Michal Hocko wrote:
> On Tue 08-11-16 08:31:50, Naoya Horiguchi wrote:
> > This patch prepares thp migration's core code. These code will be open when
> > unmap_and_move() stops unconditionally splitting thp and get_new_page() starts
> > to allocate destination thps.
> 
> this description is underdocumented to say the least. Could you
> provide a high level documentation here please?

Yes, I'll do.

And maybe some update on Documentation/vm/page_migration will be wanted,
so will do it too.

Thanks,
Naoya Horiguchi