linux-kernel - Re: [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround

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Message-ID: <20140605132639.GK6758@twins.programming.kicks-ass.net>
Date:	Thu, 5 Jun 2014 15:26:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Jiri Olsa <jolsa@...hat.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>
Subject: Re: [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround

On Thu, Jun 05, 2014 at 03:16:47PM +0200, Stephane Eranian wrote:
> > Pretty much anything !early_initcall() is ran after SMP bringup iirc.
> 
> Ok, we can try this. Need to check the impact on NMI watchdog if
> already active.

Right, we could provide an interface to stop and restart the watchdog so
that the PMU is quiescent when we flip this switch, if required. 

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