linux-kernel - Re: [HMM 12/15] mm/migrate: new memory migration helper for use with device memory v4

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Message-ID: <20170726191432.GC21717@redhat.com>
Date:   Wed, 26 Jul 2017 15:14:32 -0400
From:   Jerome Glisse <jglisse@...hat.com>
To:     Evgeny Baskakov <ebaskakov@...dia.com>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Sherry Cheung <SCheung@...dia.com>,
        Subhash Gutti <sgutti@...dia.com>
Subject: Re: [HMM 12/15] mm/migrate: new memory migration helper for use with
 device memory v4

On Tue, Jul 25, 2017 at 03:45:14PM -0700, Evgeny Baskakov wrote:
> On 7/20/17 6:33 PM, Jerome Glisse wrote:
> 
> > So i pushed an updated hmm-next branch it should have all fixes so far, including
> > something that should fix this issue. I still want to go over all emails again
> > to make sure i am not forgetting anything.
> > 
> > Cheers,
> > Jérôme
> 
> Hi Jerome,
> 
> Thanks for updating the documentation for hmm_devmem_ops.
> 
> I have an inquiry about the "fault" callback, though. The documentation says
> "Returns: 0 on success", but can the driver set any VM_FAULT_* flags? For
> instance, the driver might want to set the VM_FAULT_MAJOR flag to indicate
> that a heavy-weight page migration has happened on the page fault.
> 
> If that is possible, can you please update the documentation and list the
> flags that are permitted in the callback's return value?

Yes you can.

Jérôme