linux-kernel - Re: [PATCH 04/10] fblog: implement fblog

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Message-ID: <CANq1E4S=s3fE9Yf4_sqKrJ_FP7OS7qHC8hmD5autBSJLmF7Z+Q@mail.gmail.com>
Date:	Mon, 18 Jun 2012 20:36:48 +0200
From:	David Herrmann <dh.herrmann@...glemail.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	linux-serial@...r.kernel.org,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 04/10] fblog: implement fblog_redraw()

Hi Alan

On Sun, Jun 17, 2012 at 12:35 AM, Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> On Sun, 17 Jun 2012 00:04:20 +0200
> David Herrmann <dh.herrmann@...glemail.com> wrote:
>
>> This mostly copies the functionality from drivers/video/console/bitblit.c
>> so we can draw the console content on all available framebuffers.
>>
>> All speed optimizations have been removed for simplicity. The original
>> code depends heavily on CONFIG_VT so we cannot share the codebase here.
>
> No. That means we've got two sets of code to maintain not one. Fix the
> dependancy.
>
> Pull the relevant subset of struct vc_data into another struct
> Make struct vc_data be
>
> struct vc_data {
>        struct vc_whatever
>        rest
> }

It's a bit more complex as we cannot call scr_read() either. Hence, I
need to assemble the array of printed characters before calling the
redraw functions. But that should be feasible, too. I just need to
figure out how to avoid heavy allocations during redraw to avoid
slowdowns.

If there are no objections I will send these patches as a separate
patchset as we can apply it without fblog.

> Alan

Thanks for reviewing
David
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