Re: [patch] Real-Time Preemption, -RT-2.6.13-rc4-V0.7.52-01

Daniel Walker
2005-08-02T04:07:59Z

On Mon, 2005-08-01 at 23:55 -0400, Steven Rostedt wrote:
> On Mon, 2005-08-01 at 14:20 -0700, Daniel Walker wrote:
> > It means that IRQ 14 is running for a long time as an RT task
>
> Oh yeah, I forgot to comment on this. Yes IRQ 14 is rather slow. It's
> the IDE drive interrupt and it gets pretty busy. Actually the check
> doesn't really see if it is running for a long time, since it gets
> scheduled out. But I'm running this on a slow 368MHz machine and it
> takes some time. There's cases where every second the interrupt just
> happened to be running, since that is what it checks. It doesn't check
> to see if the thread actual sleeps.
>
> I may add something to your patch to see if a thread actually goes to
> sleep. If it doesn't then to flag it as possible stuck.

I was offering to do that earlier , but I assumed your other patch was
sufficient .. Feel free to add it if you think it's needed..

Daniel