Jonathan Andrews jonshouse.co.uk> writes:
>
> What about a yield alignment mechanism for user space. IE the process
> calls the kernel with a request "schedule me first after a yeild" - then
> the process at least has whatever the timer granularity is to do
> something timing critical... add a
On Sun, 2013-02-17 at 18:05 -0800, Greg KH wrote:
> On Sun, Feb 17, 2013 at 02:37:24PM +, Jonathan Andrews wrote:
> > From a user perspective it seems a bit crap to have to change the kernel
> > if you have a workload that preemption is harmful to.
> > In the case of something like the Raspb
On Sun, Feb 17, 2013 at 02:37:24PM +, Jonathan Andrews wrote:
> From a user perspective it seems a bit crap to have to change the kernel
> if you have a workload that preemption is harmful to.
> In the case of something like the Raspberry Pi changing the kernel if
> the distribution has not d
On Sun, 2013-02-17 at 14:37 +, Jonathan Andrews wrote:
> > > The dim pixel code is timing critical (but as I said only a tiny
> > > fraction of the total CPU usage). What I need to do is grab the CPU and
> > > prevent any context switch (IRQ or PREEMPT) for this period.
> > why you want to do t
> > The dim pixel code is timing critical (but as I said only a tiny
> > fraction of the total CPU usage). What I need to do is grab the CPU and
> > prevent any context switch (IRQ or PREEMPT) for this period.
> why you want to do this?
Because I need an I/O pin to change state for a short accurat
On Sat, 2013-02-16 at 14:37 +, Jonathan Andrews wrote:
> I hope this is the correct place, I expect to get abused.
>
> I'm trying to do a mostly soft real-time task with a very small hard
> real time element.
>
> I've written some code to drive matrix LED signs using a Raspberry Pi.
>
> Sour
I hope this is the correct place, I expect to get abused.
I'm trying to do a mostly soft real-time task with a very small hard
real time element.
I've written some code to drive matrix LED signs using a Raspberry Pi.
Source here:
http://www.jonshouse.co.uk/download/128x32_red_green_led_sign.tar.
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