linux-kernel - Re: [HMM 03/16] mm/ZONE_DEVICE/free-page: callback when page is freed v3

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Message-ID: <20170319200849.GD2774@techsingularity.net>
Date:   Sun, 19 Mar 2017 20:08:49 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     J?r?me Glisse <jglisse@...hat.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        David Nellans <dnellans@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [HMM 03/16] mm/ZONE_DEVICE/free-page: callback when page is
 freed v3

On Thu, Mar 16, 2017 at 12:05:22PM -0400, J?r?me 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.
> 

If it does not implement it's own management then it still needs to be
freed to the main allocator.