linux-kernel - Re: [PATCH] Add sysfs support for fbdefio delay

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Message-ID: <45a44e481002260309of5b51c9t79302ec5fa132b9e@mail.gmail.com>
Date:	Fri, 26 Feb 2010 19:09:28 +0800
From:	Jaya Kumar <jayakumar.lkml@...il.com>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
Cc:	"Rick L. Vinyard Jr." <rvinyard@...nmsu.edu>,
	linux-kernel@...r.kernel.org, npavel@...ner.com,
	tomi.valkeinen@...ia.com, tony@...mide.com,
	FlorianSchandinat@....de, krzysztof.h1@...pl,
	akpm@...ux-foundation.org, linux-fbdev@...r.kernel.org,
	jkosina@...e.cz
Subject: Re: [PATCH] Add sysfs support for fbdefio delay

On Fri, Feb 26, 2010 at 6:53 PM, Bruno Prémont
<bonbons@...ux-vserver.org> wrote:
> For me the driver would start with a default delay that matches the
> full-redraw throughput of the device but userspace could reduce the
> delay when it knows it will mostly just refresh small parts of the
> display (one or two tiles) and would like those done at a higher rate.

Who in userspace will know to reduce the delay? How will it know that
the delay should be reduced?

>
> A sample application would be displaying a media player interface
> like the one of XMMS and clones where Umeter (the part displaying
> volume per frequency range) could be refreshed ten times a second,
> the current position once a second and all the rest only on song
> change.

xmms/umeter will talk to this sysfs entry?

>
> Knowing the size of the display, probability that it's being used
> directly by X server is very small, it would rather be some application
> using it as a sideport display.
>

Yes, I'd like to know which applications these are.

Thanks,
jaya
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