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

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Message-ID: <CADknwL5S8QpzCAgrKHjbGTbEx7nA8L=Vu8d-UWAYCg6X25OcGw@mail.gmail.com>
Date:	Thu, 5 Jun 2014 09:32:28 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, jolsa@...hat.com, zheng.z.yan@...el.com,
	maria.n.dimakopoulou@...il.com
Subject: Re: [PATCH 9/9] perf/x86: add syfs entry to disable HT bug workaround

On 4 June 2014 22:34, Stephane Eranian <eranian@...gle.com> wrote:
> From: Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>
>
> This patch adds a sysfs entry:
>
>         /sys/devices/cpu/ht_bug_workaround
>
> to activate/deactivate the PMU HT bug workaround.
>
> To activate (activated by default):
>  # echo 1 > /sys/devices/cpu/ht_bug_workaround
>
> To deactivate:
>  # echo 0 > /sys/devices/cpu/ht_bug_workaround

If your hardware contains this erratum, why would you ever want to
disable the workaround? Providing the user with the option of turning
this off seems like a bad idea.

I suspect that users will rarely know whether they can legitimately
disable this.
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