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From: Peter Zijlstra <>
To: Jaya Kumar <>
Cc: Andrew Morton <>,,,
Subject: Re: [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: hecuba/E-Ink fbdev driver
Date: Fri, 12 Jan 2007 08:15:45 +0100	[thread overview]
Message-ID: <1168586145.26496.35.camel@twins> (raw)
In-Reply-To: <>

On Thu, 2007-01-11 at 19:22 -0500, Jaya Kumar wrote:

> Agreed. Though I may be misunderstanding what you mean by first-touch.
> Currently, I do a schedule_delayed_work and leave 1s between when the
> page_mkwrite callback indicating the first touch is received and when
> the deferred IO is processed to actually deliver the data to the
> display. I picked 1s because it rounds up the display latency. I
> imagine increasing the delay further may make it miss some desirable
> display activity. For example, a slider indicating progress of music
> may be slower than optimal. Perhaps I should make the delay a module
> parameter and leave the choice to the user?

How about implementing the sync_page() aop? Then you could force the
flush using msync(MS_SYNC). 

Hmm... that might require more surgery but the idea would work I think.

  parent reply	other threads:[~2007-01-12  7:17 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-11 14:24 Jaya Kumar
2007-01-11 21:37 ` Andrew Morton
2007-01-12  0:22   ` Jaya Kumar
2007-01-12  0:36     ` Andrew Morton
2007-01-12  0:47     ` Nick Piggin
2007-02-17  9:47       ` Jaya Kumar
2007-01-12  7:15     ` Peter Zijlstra [this message]
2007-01-12  7:25       ` Andrew Morton

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