linux-ext4 - Re: [PATCH] mm: replace FAULT_FLAG_SIZE with parameter to huge

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Message-ID: <CAPcyv4hiwWebCT=qPccKqaQKAHydMYsg9+=pYh=SPkNzakLc1A@mail.gmail.com>
Date:   Mon, 6 Feb 2017 09:30:22 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Matthew Wilcox <mawilcox@...rosoft.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-xfs@...r.kernel.org, Linux MM <linux-mm@...ck.org>,
        Vlastimil Babka <vbabka@...e.cz>, Jan Kara <jack@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-ext4 <linux-ext4@...r.kernel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH] mm: replace FAULT_FLAG_SIZE with parameter to huge_fault

On Mon, Feb 6, 2017 at 9:27 AM, Christoph Hellwig <hch@...radead.org> wrote:
> On Mon, Feb 06, 2017 at 08:24:48AM -0800, Dan Williams wrote:
>> > Also can be use this opportunity
>> > to fold ->huge_fault into ->fault?
>>
>> Hmm, yes, just need a scheme to not attempt huge_faults on pte-only handlers.
>
> Do we need anything more than checking vma->vm_flags for VM_HUGETLB?

s/VM_HUGETLB/VM_HUGEPAGE/

...but yes as long as we specify that a VM_HUGEPAGE handler must
minimally handle pud and pmd.