linux-kernel - Re: perf_events: questions about cpu_has_ht

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Message-ID: <1303483678.4865.0.camel@laptop>
Date:	Fri, 22 Apr 2011 16:47:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Lin Ming <ming.m.lin@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"Kleen, Andi" <andi.kleen@...el.com>
Subject: Re: perf_events: questions about cpu_has_ht_siblings() and offcore
 support

On Fri, 2011-04-22 at 16:41 +0200, Stephane Eranian wrote:
> I assume that's because hotplug
> cpu is inherently serialized. You cannot have a CPU going offline
> and one going online at the same time. is that right? 

Exactly, that's all serialized under the hotpug mutex

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