Fiasco.OC thread execution time

[Reinier Millo Sánchez]

Hi Georg

I'm trying to use your implementation of execution_time on GenodeOS for 
base-foc.
I want to measure the execution time of an application inside itself at 
certain points to make some benchmarks. I'm reviewing how to call the 
function within the same application in which I want to measure time, 
but I don't have found way to do it.
If you can help me or recomend me some references.

Best regards



On 02/23/2016 04:20 AM, Georg Guba wrote:
> Hello Stefan,
>
> oh wow. What a beginner's mistake. Thank you. Of course I cast the 
> message register wrong (missing a & there). It seems to be working now:
>
> time = *(l4_kernel_clock_t*)&l4_utcb_mr()->mr[0];
>
> Thanks a lot.
>
> Best regards,
> Georg
>
> On 23 February 2016 at 09:53, Stefan Kalkowski 
> <stefan.kalkowski at ...1... 
> <mailto:stefan.kalkowski at ...1...>> wrote:
>
>     Hello Georg,
>
>     On 02/22/2016 06:38 PM, Georg Guba wrote:
>     > I'm trying to implement Platform_thread::execution_time() for
>     Fiasco.OC.
>     > However, when using the code below, I'm getting a null pointer
>     error when
>     > trying to read the UTCB's message register:
>     >
>     > Possible null pointer READ at 0 IP 704c0d7c
>     >
>     > unsigned long long Platform_thread::execution_time() const
>     > {
>     > unsigned long long time = 0;
>     >
>     > if (_utcb)
>     > {
>     > l4_thread_stats_time(_thread.local.dst());
>     > time = *(l4_kernel_clock_t*)l4_utcb_mr()->mr[0];
>     > }
>     >
>     > return time;
>     > }
>     >
>     > The doc for l4_thread_stats_time(...) says
>     >
>     > /**
>     > * \brief Get consumed timed of thread in µs.
>     > * \ingroup l4_thread_api
>     > * \param thread Thread to get the consumed time from.
>     > *
>     > * The consumed time is returned as l4_kernel_clock_t at UTCB message
>     > * register 0.
>     > */
>     > L4_INLINE l4_msgtag_t
>     > l4_thread_stats_time(l4_cap_idx_t thread) L4_NOTHROW;
>     >
>     > So my usage should be about right.
>     > What am I missing?
>
>     although, this is a bit off-topic and I did not used the mentioned
>     kernel feature till now (you might refer to the l4-hackers
>     mailing-list
>     when having further questions regarding Fiasco.OC and L4Re), I'll
>     try to
>     help you.
>
>     It seems you expected a pointer in the UTCB to the time structure, but
>     it is surely a value (the kernel wouldn't know where to deposit the
>     value aside of the UTCB, it doesn't do memory allocations on behalf of
>     user tasks).
>
>     When searching for the right usage of "l4_thread_stats_time", I came
>     across this post on the l4-hackers mailinglist:
>     http://os.inf.tu-dresden.de/pipermail/l4-hackers/2012/005419.html
>
>     I hope it helps.
>
>     Regards
>     Stefan
>
>     >
>     >
>     >
>     >
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>     --
>     Stefan Kalkowski
>     Genode Labs
>
>     http://www.genode-labs.com/ · http://genode.org/
>
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-- 
Lic. Reinier Millo Sánchez
Centro de Estudios de Informática
Universidad Central "Marta Abreu" de Las Villas
Carretera a Camajuaní Km 5 1/2
Santa Clara, Villa Clara, Cuba
CP 54830

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