netdev - Re: [PATCH net-next v1 08/11] xdp: tracking page

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Date:   Wed, 19 Jun 2019 14:12:55 +0300
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Tariq Toukan <tariqt@...lanox.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Toke Høiland-Jørgensen <toke@...e.dk>,
        "toshiaki.makita1@...il.com" <toshiaki.makita1@...il.com>,
        "grygorii.strashko@...com" <grygorii.strashko@...com>,
        "mcroce@...hat.com" <mcroce@...hat.com>
Subject: Re: [PATCH net-next v1 08/11] xdp: tracking page_pool resources and
 safe removal

On Tue, Jun 18, 2019 at 08:54:07PM +0300, Ivan Khoronzhuk wrote:
Hi, Jesper

>On Tue, Jun 18, 2019 at 05:19:51PM +0200, Jesper Dangaard Brouer wrote:
>

[...]

>>If we had to allow page_pool to be registered twice, via
>>xdp_rxq_info_reg_mem_model() then I guess we could extend page_pool
>>with a usage/users reference count, and then only really free the
>>page_pool when refcnt reach zero.  But it just seems and looks wrong
>>(in the code) as the hole trick to get performance is to only have one
>>user.

Let's try this variant. This might be used only in case if no choice.
If no issues and provide appropriate comments in the code it can look
more a while normal.

-- 
Regards,
Ivan Khoronzhuk