Re: Hyperthreading: easiest userland method?

[Chris Friesen]

Dan Behman wrote:
> Hi,
>
> I have a need to programmatically determine whether or not hyperthreading
> is enabled (and in use) for licensing reasons in my application.
> Currently, I know of two ways to do this:


> From scouring the archives and the net, it doesn't seem like there's any
> API that currently exists, but perhaps I've missed something.
> /proc/cpuinfo gathers its information from somewhere - is there a way in
> userland to bypass /proc/cpuinfo and directly get this data manually?

You could probably load a kernel module to check this stuff.

For 2.4, in arch/i386/kernel/setup.c, look for the code that checks for 
X86_FEATURE_HT.  You should be able to just copy that logic into a 
kernel module and export the result via /proc.

Chris

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