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Re: Measure the Accept Queueing Time
On Friday 17 February 2006 17:59, Frank Ch. Eigler wrote:
>
> ak wrote:
>
> > interrupt 1
> > calls function to be measured
> > startprobe
> > ... function runs....
> > interrupt 2 from a different device
> > calls function to be measured again
> > startprobe nested
> > ... function runs nested ...
> > endprobe nested
> > interrupt 2 ends
> > ... function still runs ...
> > endprobe
> > [...]
>
> If this is happening on the same CPU, then it really shouldn't be
> happening at all. On one hand, at probe start time, systemtap checks
> for reentrancy and aborts any nested probes during context allocation,
The probes itself are not nested. Just the to be measured function is.
-Andi