Re: [HMM 02/15] mm/put_page: move ZONE_DEVICE page reference decrement v2

[Dan Williams]

On Fri, Apr 21, 2017 at 8:30 PM, JÃrÃme Glisse <jglisse@xxxxxxxxxx> 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: JÃrÃme Glisse <jglisse@xxxxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>

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