[patch powertop svn] don't suggest NO_HZ unless it's possible!

[Magnus Fromreide]

On ons, 2007-09-26 at 22:27 -0700, Arjan van de Ven wrote:
> David Brownell wrote:
> > This patch gets rid of a major annoyance:  it stops the "use NO_HZ!"
> > suggestions on x86_64 and other platforms which can't support it.
> 
> Hi,
> 
> I both agree and disagree with this. x86_64 does support NO_HZ, you 
> just need a 2.6.24 kernel or the -hrt patchkit. So I agree the current 
> message isn't correct.... but I don't think just making it go away is 
> right either; PowerTOP should suggest getting a tickless kernel in 
> that case.
> 
> > 
> > This lets the other messages -- the ones which could actually do some
> > good on this system!! -- be seen.  Else, it seems like the impossible
> > NO_HZ suggestion is the only one ever visible.
> 
> hmm that would be a bug; in principle the messages should rotate (but 
> with a priority bias); it could be the priorities are just off...

Would it be possible to add a command to get to the next suggestion, or
maybe even a way to navigate among the active suggestions.

Even with the rotation it seems you mostly ends up with the wrong
message, so some user control here would be nice.

/MF