linux-kernel - Re: [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region

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Message-ID: <878sy1h3k8.fsf@concordia.ellerman.id.au>
Date:   Wed, 27 Feb 2019 22:29:59 +1100
From:   Michael Ellerman <mpe@...erman.id.au>
To:     "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...nel.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        David Gibson <david@...son.dropbear.id.au>,
        Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V7 0/4] mm/kvm/vfio/ppc64: Migrate compound pages out of CMA region

"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com> writes:
> Andrew Morton <akpm@...ux-foundation.org> writes:
>
>> [patch 1/4]: OK.  I guess.  Was this worth consuming our last PF_ flag?
>
> That was done based on request from Andrea and it also helps in avoiding
> allocating pages from CMA region where we know we are anyway going to
> migrate them out. So yes, this helps. 
>
>> [patch 2/4]: unreviewed
>> [patch 3/4]: unreviewed, mpe still unhappy, I expect?
>
> I did reply to that email. I guess mpe is ok with that?

It would be nice to fold your explanation about DAX into the change log,
so it's there for people to see.

And I think my comment about initialising ret still stands.

cheers