Issues getting IO times using Schedtimes.stp example script
Sunny Fugate
fugate@spawar.navy.mil
Tue Jan 31 00:05:00 GMT 2012
Thanks for the help....
The justification for the kernel change is odd....apparently internal kernel features disappear if nobody is using them in an obvious manner.
Cheers,
-Sunny
On Jan 30, 2012, at 4:48 PM, Josh Stone wrote:
> On 01/30/2012 03:13 PM, Sunny Fugate wrote:
>> I'm having some difficulties in getting one of the examples scripts to
>> run. According to the documentation, the kernel.trace("sched_switch")
>> probe should expose $prev, $next, and $rq. I've played around with the
>> stp script and on my system the $rq variable is never defined.
>
> There used to be a rq parameter, but it was removed from the kernels
> 2.6.35+ by commit 27a9da65:
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=27a9da6538ee18046d7bff8e36a9f783542c54c3
>
> I don't know any other way off-hand to get at the runqueue -- it is held
> very secretively in sched internals.
>
> Josh
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