Re: [Xenomai-core] measuring tasks execution time

[Daniel Simon <Daniel.Simon@domain.hid>]

On Mon, 25 Jun 2007 18:55:45 +0200
Jan Kiszka <jan.kiszka@domain.hid> wrote:



> My idea was to keep a persistent version the existing xnstat_runtime_t
> instance in xnthread (and later on also xnintr). That one shall not be
> reset on readout via /proc.
Is it necessary to keep also the reset one?

> Instead, you establish quite some new calculations that break
> the existing API (the switch date is given via "start" - which was
> misnamed so far, I just changed it to "date") 

ok, better fit the behaviour.
I should better work from the last svn version?

>and increase the runtime
> overhead in the hotpath. Why? All the information you should need is
> already there, it just has to be saved from being vaporised when the
> user dumps /proc/xenomai/stat.
> 
> >  	(sched)->last_account_switch = start; \
> >  } while (0)
> >    
> 
> Let's try it like this: Change Xenomai so that it leaves the existing
> xnthread_t::stat.account untouched when it reads /proc. Rather add
> something like "xnstat_runtime_t last;" to xnthread_t::stat. On readout
> for /proc output, 
Where is this done? I've found one place in module::stat_seq_open where total is
reset to 0, is it the only one? 
In fact I don't have a clear picture of the stat
process and what it is assumed to do (and thus did not want to break something!)
>do the stats now like "account-last" and then move
> account into last. For your task exectime, you can then read
> xnthread_t::stat.account directly, because it will always reflect the
> full task history. Would't this work better?

> Thanks for working on this!
I'll try to find enough time by the end of this week to improve this...

	Daniel

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