linux-kernel - Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is freed

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Message-ID: <7ec714d6-6779-5abf-0607-862acddfbd4a@gmail.com>
Date:   Mon, 21 Nov 2016 12:49:55 +1100
From:   Balbir Singh <bsingharora@...il.com>
To:     Jérôme Glisse <jglisse@...hat.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [HMM v13 04/18] mm/ZONE_DEVICE/free-page: callback when page is
 freed



On 19/11/16 05:18, Jérôme Glisse wrote:
> When a ZONE_DEVICE page refcount reach 1 it means it is free and nobody
> is holding a reference on it (only device to which the memory belong do).
> Add a callback and call it when that happen so device driver can implement
> their own free page management.
> 

Could you give an example of what their own free page management might look like?

Balbir Singh.