Attempting to try out "asynchronous probes" and the current runtime...

[William Cohen]

Spirakis, Charles wrote:
> All --
> 
> I'm playing around with an "asynchronous probe" concept and the current
> runtime using simple os timers (code is below). Anyone have experience
> with task_pt_regs() function? As you can see, I'm trying to grab the
> "current" pt_regs in the home of seeing the eip at the time of the timer
> interrupt, but the data I get is not what I'd hoped.
> 
> This is running on a Pentium M laptop with the mm2 kernel,
> CONFIG_PREEMPT_NONE=y, other preemption configs are not set.
> 
> -- charles

You might take a look at the fall back timer interrupt mechanism in 
OProfile to see how it works. In particular look at the 
linux/driver/oprofile/timer_int.c.

I noticed there are a couple things that were i386 specific in the 
example, use of regs->eip and task_pt_regs.


-Will