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

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Message-ID: <20150730103037.GU19282@twins.programming.kicks-ass.net>
Date:	Thu, 30 Jul 2015 12:30:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Xunlei Pang <xlpang@....com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Xunlei Pang <pang.xunlei@...aro.org>
Subject: Re: [PATCH] sched: Avoid sched domain rebuilding when hotplugging an
 isolate cpu

On Fri, Jul 17, 2015 at 04:03:45PM +0800, Xunlei Pang wrote:
> From: Xunlei Pang <pang.xunlei@...aro.org>
> 
> 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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