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Date: Fri, 29 Jun 2007 17:52:01 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-core] measuring tasks execution time
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To: Daniel Simon <Daniel.Simon@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>

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Daniel Simon wrote:
> On Fri, 29 Jun 2007 17:00:39 +0200
> Jan Kiszka <jan.kiszka@domain.hid> wrote:
>=20
>> Exectime is only updated on task switches. So you are not obtaining th=
e true
>> value when requesting your own data. Use the same formula for both cas=
es.
>=20
> yes, but like that the fraction of time spent in the current execution =
is not
> accounted, which might be sometimes useful (e.g. to integrate the cost =
of a
> feedback scheduler in the total control budget)

Yeah, true, I applied the inverse logic. However, this interface is
inconsistent, one should expects the same algorithm applied on both
local as well as remote task queries. Why do you differentiate?

>=20
> another potentially useful feature would be also accounting the executi=
on time
> spent in secondary mode... no idea on how to do that.=20
> BTW, Posix defines an optional CLOCK_THREAD_CPUTIME which is assumed to=
 provide
> this measure ?

This should work for shadow threads to retrieve their secondary-mode
runtime. Give it a try.

Jan


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