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SubjectRe: [PATCH][2.5.32] CPU frequency and voltage scaling (0/4)
On Wed, Aug 28, 2002 at 12:49:31PM -0700, Linus Torvalds wrote:
> On 28 Aug 2002, Alan Cox wrote:
> >
> > You might want to read the paper on the original cpufreq for ARM. It
> > gives real world cases where the user -needs- to be able to control the
> > policy. I think you misunderstand what the interface is about. Large
> > numbers of systems benefit from usermode policy engines.
> That's not the point.
> The point is that the _policy_ (not the end result) needs to be pushed
> down to the kernel, so that the kernel can do the right thing with it.
> That policy can be updated in "real time" from user space, of course. But
> the fact is that you cannot just set a frequency and leave it at that, it
> doesn't work.

On the long term, maybe. But cpufreq is only the driver, which lets you have
such a policy engine in the kernel. And as long as this policy engine
doesn't exist, why not offer the user some control over his system?

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