linux-kernel - Re: [PATCH 09/11] x86, perf: Support sysfs files depending on SMT status

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Message-ID: <20160118180316.GU6357@twins.programming.kicks-ass.net>
Date:	Mon, 18 Jan 2016 19:03:16 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 09/11] x86, perf: Support sysfs files depending on SMT
 status

On Fri, Jan 15, 2016 at 05:12:51PM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Add a way to show different sysfs events attributes depending on
> HyperThreading is on or off. This is difficult to determine
> early at boot, so we just do it dynamically when the sysfs
> attribute is read.
> 
> v2:
> Compute HT status only once in CPU online/offline hooks.


But we still have the 'duplicate' functionality in fixup_ht_bug() as
reported last time. Please merge these two, we should not have 2
different means of detecting SMT.