linux-kernel - Re: turn the hmm migrate

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Message-ID: <20190730130944.GA4566@lst.de>
Date:   Tue, 30 Jul 2019 15:09:44 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jason Gunthorpe <jgg@...lanox.com>
Cc:     Christoph Hellwig <hch@....de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        Bharata B Rao <bharata@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: turn the hmm migrate_vma upside down

On Tue, Jul 30, 2019 at 12:32:24PM +0000, Jason Gunthorpe wrote:
> Does this only impact hmm users, or does migrate.c have a broader
> usage?

migrate.c really contains two things:  the traditional page migration
code implementing aops ->migrate semantics, and migrate_vma and its
callbacks.  The first part is broader, the second part is hmm specific
(and should probably have been in a file of its own, given that it is
guarded off CONFIG_MIGRATE_VMA_HELPER).  This series only touched the
latter part.