linux-kernel - Re: [PATCH 4/7] perf: Check if HT is supported and enabled

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Message-ID: <1294148675.2016.139.camel@laptop>
Date:	Tue, 04 Jan 2011 14:44:35 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Lin Ming <ming.m.lin@...el.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <andi@...stfloor.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] perf: Check if HT is supported and enabled

On Tue, 2011-01-04 at 14:38 +0100, Stephane Eranian wrote:
> My solution at the time (2.6.30) was to do:
>         ht_enabled = cpumask_weight(__get_cpu_var(cpu_sibling_map)) > 1;

Won't that report a machine a HT disabled when you offline a sibling?
Which kinda defeats the purpose of our usage here, since we need to know
it before either sibling comes online.
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