lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 11 Feb 2019 15:38:22 +0000
From:   Tariq Toukan <tariqt@...lanox.com>
To:     Matthew Wilcox <willy@...radead.org>,
        Tariq Toukan <tariqt@...lanox.com>
CC:     Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        David Miller <davem@...emloft.net>,
        "brouer@...hat.com" <brouer@...hat.com>,
        "toke@...hat.com" <toke@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC, PATCH] net: page_pool: Don't use page->private to store
 dma_addr_t



On 2/11/2019 2:12 PM, Matthew Wilcox wrote:
> On Mon, Feb 11, 2019 at 08:53:19AM +0000, Tariq Toukan wrote:
>> It's great to use the struct page to store its dma mapping, but I am
>> worried about extensibility.
>> page_pool is evolving, and it would need several more per-page fields.
>> One of them would be pageref_bias, a planned optimization to reduce the
>> number of the costly atomic pageref operations (and replace existing
>> code in several drivers).
> 
> There's space for five words (20 or 40 bytes on 32/64 bit).
> 

OK so this is good for now, and for the near future.
Fine by me.

Regards,
Tariq

Powered by blists - more mailing lists