Re: [PATCH 2.6] Mousedev - better button handling under load

[Dmitry Torokhov <dtor_core@ameritech.net>]

On Sunday 06 June 2004 04:58 am, Vojtech Pavlik wrote:
> On Sat, Jun 05, 2004 at 02:49:00AM -0500, Dmitry Torokhov wrote:
> > Hi,
> > 
> > Currently mousedev combines all hardware motion data that arrivers since
> > last time userspace read data into one cooked PS/2 packet. The problem is
> > that under heavy or even moderate load, when userspace can't read data
> > quickly enough, we start loosing valuable data which manifests in:
> > 
> > - ignoring buton presses as by the time userspace gets to read the data
> >   button has already been released;
> > - click starts in wrong place - by the time userspace got aroungd and read
> >   the packet mouse moved half way across the screen.
> > 
> > The patch below corrects the issue - it will start accumulating new packet
> > every time userspace is behind and button set changes. Size of the buffer
> > is 16 packets, i.e. up to 8 pairs of press/release events which should be
> > more than enough.
> > 
> > The patch is against Vojtech's tree and shuld apply to -mm. I also have
> > cumulative mousedev patch done against 2.6.7-pre2 at:
> > 
> > http://www.geocities.com/dt_or/input/misc/mousedev-2.6.7-rc2-cumulative.patch.gz
> 
> Thanks for this. Can I just pull from your tree, or is there more that I
> shouldn't take?
> 

I am exporting stuff to my bk tree on as-needed basis so there is nothing
extra (and no mousedev changes yet). Do you want button handling changes
only or you do also want tapping emulation exported?

-- 
Dmitry