Re: cpusets not cpu hotplug aware

From: Simon Derr
Date: Mon Aug 21 2006 - 09:52:25 EST

On Mon, 21 Aug 2006, Anton Blanchard wrote:

> Hi,
> We have a bug report where sched_setaffinity fails for cpus that are
> hotplug added after boot. Nathan found this suspicious piece of code:
> void __init cpuset_init_smp(void)
> {
> top_cpuset.cpus_allowed = cpu_online_map;
> top_cpuset.mems_allowed = node_online_map;
> }
> Any reason we statically set the top level cpuset to the boot time cpu
> online map?

Are you suggesting that all possible cpus should be in the top cpuset,
instead of all existing cpus ?

I'd prefer the hotplugged CPUs being added to the top cpuset afterwards.


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