linux-kernel - Re: [HMM-v25 13/19] mm/migrate: new migrate mode MIGRATE_SYNC_NO

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Date:   Thu, 17 Aug 2017 14:12:45 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        David Nellans <dnellans@...dia.com>,
        Balbir Singh <bsingharora@...il.com>
Subject: Re: [HMM-v25 13/19] mm/migrate: new migrate mode
 MIGRATE_SYNC_NO_COPY

On Wed, 16 Aug 2017 20:05:42 -0400 J__r__me Glisse <jglisse@...hat.com> wrote:

> Introduce a new migration mode that allow to offload the copy to
> a device DMA engine. This changes the workflow of migration and
> not all address_space migratepage callback can support this. So
> it needs to be tested in those cases.

Can you please expand on this?  What additional testing must be
performed before we are able to merge this into mainline?