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From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     Marcelo Tosatti <mtosatti@redhat.com>
Cc:     linux-rt-users@vger.kernel.org, John Kacur <jkacur@redhat.com>
Subject: Re: [PATCH] rt-numa: optionally ignore runtime cpumask
Message-ID: <Ye7TMlx3mJkTxCsI@linutronix.de>
References: <YerAW90QwEg9yXAb@fuller.cnet>
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 <Ye6id4lSKMcqAZ65@fuller.cnet>
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On 2022-01-24 09:58:31 [-0300], Marcelo Tosatti wrote:
> You mean "using all CPUs which are part of the current affinity mask by
> default" ? (where current affinity mask would mean user specified CPU
> mask).
> 
> > And then either specify the
> > requested CPU mask or use explicitly all CPUs.
> 
> Do you mean to drop 
> 
>         /*
>          * Clear bits that are not set in both the cpuset from the
>          * environment, and in the user specified affinity.
> 
> And just attempt to use the user specified mask? (which will then return
> failure to the user in which case he can correct it).
> 
After reading it again, I don't get it.
  cyclictest -a

Uses all CPUs in the system. 

  cyclictest -a $CPU

Uses the $CPU (mask) specified. If $CPU is not part of the current CPU
mask, why shouldn't it work?

Sebastian