linux-kernel - Re: perf_events: questions about cpu_has_ht

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Message-ID: <BANLkTim7D2sP_80+Zx_KYc041uukrHMU+w@mail.gmail.com>
Date:	Fri, 22 Apr 2011 16:48:42 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Apr 22, 2011 at 4:47 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 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
>
Ok, thanks.
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