linux-kernel - Re: [RFC PATCH v2] support ioctl for tunable user request

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 linux-hardening linux-cve-announce 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]

Message-ID: <CAH9JG2Xfh7JcdBdaCUuD9wFyNPTXg_0JbvVZkEWK5jT2=W3ybA@mail.gmail.com>
Date:	Mon, 29 Aug 2011 23:01:55 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Jaehoon Chung <jh80.chung@...sung.com>
Cc:	Lin Ming <lxy@...pku.edu.cn>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jens Axboe <jaxboe@...ionio.com>,
	Arnd Bergmann <arnd.bergmann@...aro.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH v2] support ioctl for tunable user request

On Mon, Aug 29, 2011 at 7:11 PM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
> Hi
>
> Lin Ming wrote:
>> On Mon, Aug 29, 2011 at 4:15 PM, Jaehoon Chung <jh80.chung@...sung.com> wrote:
>>> This patch is added the ioctl for tunable user request.
>>
>> Hi,
>>
>> What's the use case for this new ioctl?

The below is the just mmc example.

The main reason is that there's no way to know system or I/O idle, so
user provides the hint. Using user based I/O, device can TUNE the
device itself. In case of MMC, background operation can be used.

and another difference from other user request, it's just trigger the
device tune request, no need to wait the request is done.

Thank you,
Kyungmin Park
>>
> In my case, this ioctl is used the background operation for eMMC.
> In eMMC's case, background operation(BKOPS) is supported.
> (but that is running with only card notifier, so i added new ioctl for user request)
>
> if we send the BKOPS request, card is notified to need the BKOPS.
> then running background operation. (Then user's responsibility is done)
>
> In future, i think that other block device should be used this ioctl.
> (if supported like BKOPS)
>
> Regard,
> Jaehoon Chung
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/