Re: [bisected] "sched: Allow per-cpu kernel threads to run on online && !active" causes warning

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [bisected] "sched: Allow per-cpu kernel threads to run on online && !active" causes warning
Date	2016-08-17 16:00 +0200
Message-ID	<s79xT-1My-9@gated-at.bofh.it> (permalink)
References	(5 earlier) <s6HrY-fU-23@gated-at.bofh.it> <s6Otr-4M4-1@gated-at.bofh.it> <s6OD8-4QG-11@gated-at.bofh.it> <s6OMN-4U7-3@gated-at.bofh.it> <s6V1T-yS-13@gated-at.bofh.it>
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Hello, Heiko.

On Wed, Aug 17, 2016 at 12:19:53AM +0200, Heiko Carstens wrote:
> I think the easiest solution would be to simply assign all cpus, for which
> we do not have any topology information, to an arbitrary node; e.g. round
> robin.
> 
> After all the case that cpus are added later is rare and the s390 fake numa
> implementation does not know about the memory topology. All it is doing is

Ah, okay, so there really is no requirement for a newly coming up cpu
to be on a specific node.

> distributing the memory to several nodes in order to avoid a single huge
> node. So that should be sort of ok.

Sounds good to me.  If that's the only purpose, we don't lose much by
round-robining the possible CPUs on boot and sticking with the
mapping.

Thanks.

-- 
tejun

Thread

Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-08-15 13:20 +0200
  Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Tejun Heo <tj@kernel.org> - 2016-08-16 00:50 +0200
    Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-08-16 10:00 +0200
      Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Tejun Heo <tj@kernel.org> - 2016-08-16 17:30 +0200
        Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Peter Zijlstra <peterz@infradead.org> - 2016-08-16 17:40 +0200
          Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Tejun Heo <tj@kernel.org> - 2016-08-16 17:50 +0200
            Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Heiko Carstens <heiko.carstens@de.ibm.com> - 2016-08-17 00:30 +0200
              Re: [bisected] "sched: Allow per-cpu kernel threads to run on  online && !active" causes warning Michael Holzheu <holzheu@linux.vnet.ibm.com> - 2016-08-17 11:30 +0200
              Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Tejun Heo <tj@kernel.org> - 2016-08-17 16:00 +0200
                Re: [bisected] "sched: Allow per-cpu kernel threads to run on  online && !active" causes warning Michael Holzheu <holzheu@linux.vnet.ibm.com> - 2016-08-18 11:40 +0200
                Re: [bisected] "sched: Allow per-cpu kernel threads to run on online  && !active" causes warning Tejun Heo <tj@kernel.org> - 2016-08-18 16:50 +0200
                Re: [bisected] "sched: Allow per-cpu kernel threads to run on  online && !active" causes warning Michael Holzheu <holzheu@linux.vnet.ibm.com> - 2016-08-19 12:00 +0200

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