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Date: Fri, 15 Mar 2013 21:35:49 +0800
Message-ID: <CAJd=RBAEOF7qx1=6vUAA7wYKq6i8efz=Mr9BvUHGxgEE4c6rvg@mail.gmail.com>
Subject: Re: [PATCHv2, RFC 19/30] thp, mm: split huge page on mmap file page
From: Hillf Danton <dhillf@gmail.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Al Viro <viro@zeniv.linux.org.uk>, Hugh Dickins <hughd@google.com>,
        Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
        Mel Gorman <mgorman@suse.de>, linux-mm@kvack.org,
        Andi Kleen <ak@linux.intel.com>,
        Matthew Wilcox <matthew.r.wilcox@intel.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
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On Fri, Mar 15, 2013 at 9:29 PM, Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
> Hillf Danton wrote:
>> On Fri, Mar 15, 2013 at 1:50 AM, Kirill A. Shutemov
>> <kirill.shutemov@linux.intel.com> wrote:
>> >
>> > We are not ready to mmap file-backed tranparent huge pages.
>> >
>> It is not on todo list either.
>
> Actually, following patches implement mmap for file-backed thp and this
> split_huge_page() will catch only fallback cases.
>
I wonder if the effort we pay for THP cache is nuked by mmap.
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