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Date: Mon, 5 Sep 2011 17:49:27 +0900 From: Kyungmin Park <kmpark@...radead.org> To: Jens Axboe <jaxboe@...ionio.com> Cc: Jaehoon Chung <jh80.chung@...sung.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Arnd Bergmann <arnd.bergmann@...aro.org>, Arnd Bergmann <arnd@...db.de>, Lin Ming <lxy@...pku.edu.cn> Subject: Re: [RFC PATCH v2] support ioctl for tunable user request Hi Jens, Any comments on tunable user request concept for flash based storage? Thank you, Kyungmin Park On Tue, Aug 30, 2011 at 12:17 AM, Lin Ming <lxy@...pku.edu.cn> wrote: > On Mon, Aug 29, 2011 at 10:01 PM, Kyungmin Park <kmpark@...radead.org> wrote: >> 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. > > OK. > > After read the previous patch at: > http://marc.info/?l=linux-mmc&m=131407402925988&w=2 > > I now get better understanding what "tunable user request" mean. > > Thanks. > >> >> Thank you, >> Kyungmin Park > -- > 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/
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