linux-kernel - Re: [PATCH 02/10] x86, perf: Support sysfs files depending on SMT status

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Message-ID: <20160509094219.GO3448@twins.programming.kicks-ass.net>
Date:	Mon, 9 May 2016 11:42:19 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [PATCH 02/10] x86, perf: Support sysfs files depending on SMT
 status

On Thu, May 05, 2016 at 04:03:59PM -0700, 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.
> v3: Use topology_max_smt_threads()
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---
>  arch/x86/events/core.c       | 24 ++++++++++++++++++++++++
>  arch/x86/events/perf_event.h | 14 ++++++++++++++
>  include/linux/perf_event.h   |  7 +++++++
>  3 files changed, 45 insertions(+)
> 

Should this not now live in /sys/devices/system/cpu/ ? Thomas?