Integrate delay accounting with systemtap?

[Ananth N Mavinakayanahalli]

On Wed, Jul 11, 2007 at 11:03:25AM -0700, Mike Mason wrote:
> We can easily add functions to access the task_delay_info values in 
> task_struct.  Would that be sufficient or are you thinking of something 
> more than that?

We shouldn't be using any probes or functions in kernel for this
feature. Rather, SystemTap should be taught to listen to the netlink
socket where this information is available.

Ananth

> 
> Mike
> 
> Ananth N Mavinakayanahalli wrote:
> >Hi,
> >
> >The delay accounting infrastructure has been part of the mainline kernel
> >for sometime now. From what I've heard from customer-facing people, it
> >is a great tool to determine where the performance bottlenecks are.
> >
> >See Documentation/accounting/* for more information about this
> >infrastructure.
> >
> >Combining this feature with the features SystemTap currently provides
> >would be a good thing. Would it therefore be possible to add support for
> >this infrastructure in SystemTap?
> >
> >Ananth