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

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Message-ID: <1294149501.2016.141.camel@laptop>
Date:	Tue, 04 Jan 2011 14:58:21 +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 14:52 +0100, Stephane Eranian wrote:
> 
> Couldn't you simply over-provision, and then when the CPU is online, use my
> ht_enabled statement to figure out whether or not you need to handle the sharing
> issue? 

That's pretty much what Lin's latest does:

 X86_FEATURE_HT && smp_num_siblings > 1

shows the CPU is capable of HT and will allocate the needed resources.
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