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In-Reply-To: <20170422033037.3028-3-jglisse@redhat.com>
References: <20170422033037.3028-1-jglisse@redhat.com> <20170422033037.3028-3-jglisse@redhat.com>
From: Dan Williams <dan.j.williams@intel.com>
Date: Fri, 21 Apr 2017 21:46:27 -0700
Message-ID: <CAPcyv4gGa_RrsbXHMH3Jy=GHPX-Vup-Bto-QM2OwY+BpO8MeQQ@mail.gmail.com>
Subject: Re: [HMM 02/15] mm/put_page: move ZONE_DEVICE page reference
 decrement v2
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To: =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= <jglisse@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Linux MM <linux-mm@kvack.org>, John Hubbard <jhubbard@nvidia.com>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, David Nellans <dnellans@nvidia.com>, Ross Zwisler <ross.zwisler@linux.intel.com>

On Fri, Apr 21, 2017 at 8:30 PM, J=C3=A9r=C3=B4me Glisse <jglisse@redhat.co=
m> 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: J=C3=A9r=C3=B4me Glisse <jglisse@redhat.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Ross Zwisler <ross.zwisler@linux.intel.com>

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

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