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From: Guenter Roeck <guenter.roeck@ericsson.com>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] [PATCHv7 1/1] Hwmon: Merge Pkgtemp with Coretemp
Date: Tue, 17 May 2011 15:17:22 +0000	[thread overview]
Message-ID: <20110517151722.GA4385@ericsson.com> (raw)
In-Reply-To: <1305384608-17357-1-git-send-email-durgadoss.r@intel.com>

On Tue, May 17, 2011 at 01:51:44AM -0400, R, Durgadoss wrote:
> Hi Guenter,
> 
> > Hi,
> > 
> > I did some testing on a SandyBridge system with two CPUs.
> > 
> > If I take all cores of the second CPU offline, the second instance of the
> > driver
> > still sticks around and tries to display the package sensor temperature.
> > However, the temperature is always reported as "N/A". I think the driver
> > instance should be removed if all cores of a CPU are offline.
> 
> I agree with you that the driver instance should be removed, in this case.
> But how can we find that all cores of a CPU are offline ?
> One way is to use a "count" variable and manipulate it when cores are
> Onlined/offlined. Kindly let me know of any better ways to implement this.
> 
You can define a counter in platform_data, or write a simple function to count
the number of online cores for a given physical processor in pdev_list.

A simpler mechanism might be to use cpu_core_mask(). Not sure if that works, though.

Thanks,
Guenter

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      parent reply	other threads:[~2011-05-17 15:17 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-14  9:19 [lm-sensors] [PATCHv7 1/1] Hwmon: Merge Pkgtemp with Coretemp Durgadoss R
2011-05-16 21:44 ` Guenter Roeck
2011-05-17  5:54 ` R, Durgadoss
2011-05-17 15:17 ` Guenter Roeck [this message]

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