Re: [PATCH] sched: Avoid sched domain rebuilding when hotplugging an isolate cpu

[Peter Zijlstra]

On Fri, Jul 17, 2015 at 04:03:45PM +0800, Xunlei Pang wrote:
> From: Xunlei Pang <pang.xunlei@xxxxxxxxxx>
> 
> The sched domain is always rebuilt when hotplugging an isolate cpu,
> as we can see in partition_sched_domains() with the NULL doms_new,
> current sched domain is destroyed, then rebuilt. Worse still, the
> rebuilding will reset all the parameters of the sched_domain. This
> makes no sense and contradicts the isloate concept.

What parameters? isolcpus should have fairly trivial domains to begin
with.
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