From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Andrew Morton <akpm@osdl.org>,
linux-fbdev-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
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: <45a44e480701111622i32fffddcn3b4270d539620743@mail.gmail.com>
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.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Jaya Kumar <jayakumar.lkml@gmail.com>
Cc: Andrew Morton <akpm@osdl.org>,
linux-fbdev-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
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: <45a44e480701111622i32fffddcn3b4270d539620743@mail.gmail.com>
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.
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next prev parent reply other threads:[~2007-01-12 7:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-11 14:24 [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: hecuba/E-Ink fbdev driver Jaya Kumar
2007-01-11 14:24 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Jaya Kumar
2007-01-11 14:24 ` Jaya Kumar
2007-01-11 21:37 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: " Andrew Morton
2007-01-11 21:37 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Andrew Morton
2007-01-11 21:37 ` Andrew Morton
2007-01-12 0:22 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: " Jaya Kumar
2007-01-12 0:22 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Jaya Kumar
2007-01-12 0:22 ` Jaya Kumar
2007-01-12 0:36 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: " Andrew Morton
2007-01-12 0:36 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Andrew Morton
2007-01-12 0:36 ` Andrew Morton
2007-01-12 0:47 ` Nick Piggin
2007-01-12 0:47 ` Nick Piggin
2007-02-17 9:47 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: " Jaya Kumar
2007-02-17 9:47 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Jaya Kumar
2007-02-17 9:47 ` Jaya Kumar
2007-01-12 7:15 ` Peter Zijlstra [this message]
2007-01-12 7:15 ` Peter Zijlstra
2007-01-12 7:25 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev, mm: " Andrew Morton
2007-01-12 7:25 ` [PATCH/RFC 2.6.20-rc4 1/1] fbdev,mm: " Andrew Morton
2007-01-12 7:25 ` Andrew Morton
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