linux-kernel - Re: [RFC] [rt-tests] change to cyclictest behavior

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Message-ID: <20100106162759.1d4d5b57@torg>
Date:	Wed, 6 Jan 2010 16:27:59 -0600
From:	Clark Williams <williams@...hat.com>
To:	Carsten Emde <Carsten.Emde@...dl.org>
Cc:	John Kacur <jkacur@...hat.com>,
	RT <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [rt-tests] change to cyclictest behavior

On Wed, 06 Jan 2010 23:24:17 +0100
Carsten Emde <Carsten.Emde@...dl.org> wrote:

> Clark,
> 
> >> [..]
> >> Here is my proposal:
> >> Do not change the meaning of existing options. Introduce a new option
> >> that is mutual exclusive with the -a, the -t and the -d option. This new
> >> option does the same as -a and -t and -d0 and sets the same priority to
> >> all threads. How about that?
> > Ugh, I truly *hate* adding options. Do you know that cyclictest is
> > halfway to having as many options as 'ls'?
> Well, yes, we have the choice between two bad things, breaking
> compatibility or adding another option. I prefer the latter.

Ok, I yield()  :)

> > [..]
> > How about if we create the -S/--smp option that takes no arguments and
> > causes -a, -t and -d to be ignored (with a warning). This option would
> > create one thread per cpu, each thread pinned to it's corresponding
> > cpu, all with the same sampling interval (i.e. -d0) and the same
> > priority?
> Sounds good to me.
> 
> May I ask you to also include the -n option which is almost always
> needed? This would then give:
> 
> -S      --smp              Standard SMP testing (equals -a -t -n -d0),
>                            same priority on all threads.
> 
> 	Carsten.

Yeah, you read my mind. How about -m (mlockall) as well?

Clark

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