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

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Message-ID: <20190124070503.GJ18231@xz-x1>
Date:   Thu, 24 Jan 2019 15:05:03 +0800
From:   Peter Xu <peterx@...hat.com>
To:     Jerome Glisse <jglisse@...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 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?

Regards,

-- 
Peter Xu