Re: Real-Time Preemption: Magic Sysrq p doesn't work

[Ingo Molnar]

* kus Kusche Klaus <kus@xxxxxxxx> wrote:

> While testing, I noticed that Sysrq p is silently ignored on current 
> RT kernels with RT preemption: The syslog contains a message that 
> Sysrq p was pressed, but no registers are printed.

yes, that's because the keyboard interrupt is 'threaded' - hence there's 
no 'interrupted stack' to print a backtrace of. You should be able to 
see all (including currently running) task's backtraces in SysRq-T 
output.

are you trying to use it to debug a particular bug?

	Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/