Re: get_zone_device_page() in get_page() and page_cache_get_speculative()

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To: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: Re: get_zone_device_page() in get_page() and page_cache_get_speculative()
From: Dan Williams <dan.j.williams@xxxxxxxxx>
Date: Mon, 24 Apr 2017 11:41:51 -0700
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>, Linux MM <linux-mm@xxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>, Steve Capper <steve.capper@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Dann Frazier <dann.frazier@xxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxx>, linux-tip-commits@xxxxxxxxxxxxxxx
In-reply-to: <20170424182555.faoarzlpi4ilm5dt@black.fi.intel.com>
References: <CAA9_cmf7=aGXKoQFkzS_UJtznfRtWofitDpV2AyGwpaRGKyQkg@mail.gmail.com> <20170423233125.nehmgtzldgi25niy@node.shutemov.name> <CAPcyv4i8mBOCuA8k-A8RXGMibbnqHUsa3Ly+YcQbr0eCdjruUw@mail.gmail.com> <20170424173021.ayj3hslvfrrgrie7@node.shutemov.name> <CAPcyv4g74LT6sK2WgG6FnwQHCC5fNTwfqBPq1BY8PnZ7zwdGPw@mail.gmail.com> <20170424180158.y26m3kgzhpmawbhg@node.shutemov.name> <20170424182555.faoarzlpi4ilm5dt@black.fi.intel.com>

On Mon, Apr 24, 2017 at 11:25 AM, Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
> On Mon, Apr 24, 2017 at 09:01:58PM +0300, Kirill A. Shutemov wrote:
>> On Mon, Apr 24, 2017 at 10:47:43AM -0700, Dan Williams wrote:
>> I think it's still better to do it on page_ref_* level.
>
> Something like patch below? What do you think?

>From a quick glance, I think this looks like the right way to go.

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