linux-kernel - Re: [HMM 02/15] mm/put_page: move ZONE

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Date:   Fri, 21 Apr 2017 21:46:27 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jérôme Glisse <jglisse@...hat.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [HMM 02/15] mm/put_page: move ZONE_DEVICE page reference
 decrement v2

On Fri, Apr 21, 2017 at 8:30 PM, Jérôme Glisse <jglisse@...hat.com> wrote:
> Move page reference decrement of ZONE_DEVICE from put_page()
> to put_zone_device_page() this does not affect non ZONE_DEVICE
> page.
>
> Doing this allow to catch when a ZONE_DEVICE page refcount reach
> 1 which means the device is no longer reference by any one (unlike
> page from other zone, ZONE_DEVICE page refcount never reach 0).
>
> This patch is just a preparatory patch for HMM.
>
> Changes since v1:
>   - commit message
>
> Signed-off-by: Jérôme Glisse <jglisse@...hat.com>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>

Reviewed-by: Dan Williams <dan.j.williams@...el.com>