linux-kernel - Re: [PATCH RFC 04/24] mm: gup: allow VM_FAULT

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Message-ID: <20190124153431.GB5030@redhat.com>
Date:   Thu, 24 Jan 2019 10:34:32 -0500
From:   Jerome Glisse <jglisse@...hat.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Hugh Dickins <hughd@...gle.com>,
        Maya Gokhale <gokhale2@...l.gov>,
        Johannes Weiner <hannes@...xchg.org>,
        Martin Cracauer <cracauer@...s.org>,
        Denis Plotnikov <dplotnikov@...tuozzo.com>,
        Shaohua Li <shli@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Marty McFadden <mcfadden8@...l.gov>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Mel Gorman <mgorman@...e.de>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>
Subject: Re: [PATCH RFC 04/24] mm: gup: allow VM_FAULT_RETRY for multiple
 times

On Thu, Jan 24, 2019 at 03:05:03PM +0800, Peter Xu wrote:
> On Mon, Jan 21, 2019 at 11:24:55AM -0500, Jerome Glisse wrote:
> > On Mon, Jan 21, 2019 at 03:57:02PM +0800, Peter Xu wrote:
> > > This is the gup counterpart of the change that allows the VM_FAULT_RETRY
> > > to happen for more than once.
> > > 
> > > Signed-off-by: Peter Xu <peterx@...hat.com>
> > 
> > So it would be nice to add a comment in the code and in the commit message
> > about possible fault starvation (mostly due to previous patch changes) as
> > if some one experience that and try to bisect it might overlook the commit.
> > 
> > Otherwise:
> > 
> > Reviewed-by: Jérôme Glisse <jglisse@...hat.com>
> 
> Jerome, can I still keep this r-b if I'm going to fix the starvation
> issue you mentioned in previous patch about lock page?
> 

No please, i still want to review properly the oneline ie making sure
that it will not change any of the existing use of FAULT_FLAG_TRIED
I am finishing a bunch of patches myself so i am bit short on time right
now to take a deeper look but i will try to do that in next few days :)

In anycase i will review again your next posting.

Cheers,
Jérôme